17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 53cff2f43Sstans * Common Development and Distribution License (the "License"). 63cff2f43Sstans * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 217c478bd9Sstevel@tonic-gate /* 2211494be0SStan Studzinski * Copyright (c) 1986, 2010, Oracle and/or its affiliates. All rights reserved. 23e7c874afSJosef 'Jeff' Sipek * Copyright (c) 2015, Josef 'Jeff' Sipek <jeffpc@josefsipek.net> 243f11de9dSSara Hartse * Copyright (c) 2015, 2016 by Delphix. All rights reserved. 25*0418219cSJerry Jelinek * Copyright 2018 Joyent, Inc. 267c478bd9Sstevel@tonic-gate */ 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 297c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate /* 327c478bd9Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988 337c478bd9Sstevel@tonic-gate * The Regents of the University of California 347c478bd9Sstevel@tonic-gate * All Rights Reserved 357c478bd9Sstevel@tonic-gate * 367c478bd9Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from 377c478bd9Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its 387c478bd9Sstevel@tonic-gate * contributors. 397c478bd9Sstevel@tonic-gate */ 407c478bd9Sstevel@tonic-gate 417c478bd9Sstevel@tonic-gate /* 427c478bd9Sstevel@tonic-gate * VM - physical page management. 437c478bd9Sstevel@tonic-gate */ 447c478bd9Sstevel@tonic-gate 457c478bd9Sstevel@tonic-gate #include <sys/types.h> 467c478bd9Sstevel@tonic-gate #include <sys/t_lock.h> 477c478bd9Sstevel@tonic-gate #include <sys/param.h> 487c478bd9Sstevel@tonic-gate #include <sys/systm.h> 497c478bd9Sstevel@tonic-gate #include <sys/errno.h> 507c478bd9Sstevel@tonic-gate #include <sys/time.h> 517c478bd9Sstevel@tonic-gate #include <sys/vnode.h> 527c478bd9Sstevel@tonic-gate #include <sys/vm.h> 537c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 547c478bd9Sstevel@tonic-gate #include <sys/swap.h> 557c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h> 567c478bd9Sstevel@tonic-gate #include <sys/tuneable.h> 577c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 587c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 597c478bd9Sstevel@tonic-gate #include <sys/callb.h> 607c478bd9Sstevel@tonic-gate #include <sys/debug.h> 617c478bd9Sstevel@tonic-gate #include <sys/tnf_probe.h> 627c478bd9Sstevel@tonic-gate #include <sys/condvar_impl.h> 637c478bd9Sstevel@tonic-gate #include <sys/mem_config.h> 647c478bd9Sstevel@tonic-gate #include <sys/mem_cage.h> 657c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 667c478bd9Sstevel@tonic-gate #include <sys/atomic.h> 677c478bd9Sstevel@tonic-gate #include <sys/strlog.h> 687c478bd9Sstevel@tonic-gate #include <sys/mman.h> 697c478bd9Sstevel@tonic-gate #include <sys/ontrap.h> 707c478bd9Sstevel@tonic-gate #include <sys/lgrp.h> 717c478bd9Sstevel@tonic-gate #include <sys/vfs.h> 727c478bd9Sstevel@tonic-gate 737c478bd9Sstevel@tonic-gate #include <vm/hat.h> 747c478bd9Sstevel@tonic-gate #include <vm/anon.h> 757c478bd9Sstevel@tonic-gate #include <vm/page.h> 767c478bd9Sstevel@tonic-gate #include <vm/seg.h> 777c478bd9Sstevel@tonic-gate #include <vm/pvn.h> 787c478bd9Sstevel@tonic-gate #include <vm/seg_kmem.h> 797c478bd9Sstevel@tonic-gate #include <vm/vm_dep.h> 800209230bSgjelinek #include <sys/vm_usage.h> 817c478bd9Sstevel@tonic-gate #include <fs/fs_subr.h> 82cee1d74bSjfrank #include <sys/ddi.h> 83cee1d74bSjfrank #include <sys/modctl.h> 847c478bd9Sstevel@tonic-gate 857c478bd9Sstevel@tonic-gate static pgcnt_t max_page_get; /* max page_get request size in pages */ 867c478bd9Sstevel@tonic-gate pgcnt_t total_pages = 0; /* total number of pages (used by /proc) */ 877c478bd9Sstevel@tonic-gate 887c478bd9Sstevel@tonic-gate /* 897c478bd9Sstevel@tonic-gate * freemem_lock protects all freemem variables: 907c478bd9Sstevel@tonic-gate * availrmem. Also this lock protects the globals which track the 917c478bd9Sstevel@tonic-gate * availrmem changes for accurate kernel footprint calculation. 927c478bd9Sstevel@tonic-gate * See below for an explanation of these 937c478bd9Sstevel@tonic-gate * globals. 947c478bd9Sstevel@tonic-gate */ 957c478bd9Sstevel@tonic-gate kmutex_t freemem_lock; 967c478bd9Sstevel@tonic-gate pgcnt_t availrmem; 977c478bd9Sstevel@tonic-gate pgcnt_t availrmem_initial; 987c478bd9Sstevel@tonic-gate 997c478bd9Sstevel@tonic-gate /* 1007c478bd9Sstevel@tonic-gate * These globals track availrmem changes to get a more accurate 1017c478bd9Sstevel@tonic-gate * estimate of tke kernel size. Historically pp_kernel is used for 1027c478bd9Sstevel@tonic-gate * kernel size and is based on availrmem. But availrmem is adjusted for 1037c478bd9Sstevel@tonic-gate * locked pages in the system not just for kernel locked pages. 1047c478bd9Sstevel@tonic-gate * These new counters will track the pages locked through segvn and 1057c478bd9Sstevel@tonic-gate * by explicit user locking. 1067c478bd9Sstevel@tonic-gate * 107da6c28aaSamw * pages_locked : How many pages are locked because of user specified 1087c478bd9Sstevel@tonic-gate * locking through mlock or plock. 1097c478bd9Sstevel@tonic-gate * 1107c478bd9Sstevel@tonic-gate * pages_useclaim,pages_claimed : These two variables track the 111da6c28aaSamw * claim adjustments because of the protection changes on a segvn segment. 1127c478bd9Sstevel@tonic-gate * 1137c478bd9Sstevel@tonic-gate * All these globals are protected by the same lock which protects availrmem. 1147c478bd9Sstevel@tonic-gate */ 115a98e9dbfSaguzovsk pgcnt_t pages_locked = 0; 116a98e9dbfSaguzovsk pgcnt_t pages_useclaim = 0; 117a98e9dbfSaguzovsk pgcnt_t pages_claimed = 0; 1187c478bd9Sstevel@tonic-gate 1197c478bd9Sstevel@tonic-gate 1207c478bd9Sstevel@tonic-gate /* 1217c478bd9Sstevel@tonic-gate * new_freemem_lock protects freemem, freemem_wait & freemem_cv. 1227c478bd9Sstevel@tonic-gate */ 1237c478bd9Sstevel@tonic-gate static kmutex_t new_freemem_lock; 1247c478bd9Sstevel@tonic-gate static uint_t freemem_wait; /* someone waiting for freemem */ 1257c478bd9Sstevel@tonic-gate static kcondvar_t freemem_cv; 1267c478bd9Sstevel@tonic-gate 1277c478bd9Sstevel@tonic-gate /* 1287c478bd9Sstevel@tonic-gate * The logical page free list is maintained as two lists, the 'free' 1297c478bd9Sstevel@tonic-gate * and the 'cache' lists. 1307c478bd9Sstevel@tonic-gate * The free list contains those pages that should be reused first. 1317c478bd9Sstevel@tonic-gate * 1327c478bd9Sstevel@tonic-gate * The implementation of the lists is machine dependent. 133d94ffb28Sjmcp * page_get_freelist(), page_get_cachelist(), 1347c478bd9Sstevel@tonic-gate * page_list_sub(), and page_list_add() 1357c478bd9Sstevel@tonic-gate * form the interface to the machine dependent implementation. 1367c478bd9Sstevel@tonic-gate * 1377c478bd9Sstevel@tonic-gate * Pages with p_free set are on the cache list. 1387c478bd9Sstevel@tonic-gate * Pages with p_free and p_age set are on the free list, 1397c478bd9Sstevel@tonic-gate * 1407c478bd9Sstevel@tonic-gate * A page may be locked while on either list. 1417c478bd9Sstevel@tonic-gate */ 1427c478bd9Sstevel@tonic-gate 1437c478bd9Sstevel@tonic-gate /* 1447c478bd9Sstevel@tonic-gate * free list accounting stuff. 1457c478bd9Sstevel@tonic-gate * 1467c478bd9Sstevel@tonic-gate * 1477c478bd9Sstevel@tonic-gate * Spread out the value for the number of pages on the 1487c478bd9Sstevel@tonic-gate * page free and page cache lists. If there is just one 1497c478bd9Sstevel@tonic-gate * value, then it must be under just one lock. 1507c478bd9Sstevel@tonic-gate * The lock contention and cache traffic are a real bother. 1517c478bd9Sstevel@tonic-gate * 1527c478bd9Sstevel@tonic-gate * When we acquire and then drop a single pcf lock 1537c478bd9Sstevel@tonic-gate * we can start in the middle of the array of pcf structures. 1547c478bd9Sstevel@tonic-gate * If we acquire more than one pcf lock at a time, we need to 1557c478bd9Sstevel@tonic-gate * start at the front to avoid deadlocking. 1567c478bd9Sstevel@tonic-gate * 1577c478bd9Sstevel@tonic-gate * pcf_count holds the number of pages in each pool. 1587c478bd9Sstevel@tonic-gate * 1597c478bd9Sstevel@tonic-gate * pcf_block is set when page_create_get_something() has asked the 1607c478bd9Sstevel@tonic-gate * PSM page freelist and page cachelist routines without specifying 1617c478bd9Sstevel@tonic-gate * a color and nothing came back. This is used to block anything 1627c478bd9Sstevel@tonic-gate * else from moving pages from one list to the other while the 1637c478bd9Sstevel@tonic-gate * lists are searched again. If a page is freeed while pcf_block is 1647c478bd9Sstevel@tonic-gate * set, then pcf_reserve is incremented. pcgs_unblock() takes care 1657c478bd9Sstevel@tonic-gate * of clearning pcf_block, doing the wakeups, etc. 1667c478bd9Sstevel@tonic-gate */ 1677c478bd9Sstevel@tonic-gate 16806fb6a36Sdv #define MAX_PCF_FANOUT NCPU 16906fb6a36Sdv static uint_t pcf_fanout = 1; /* Will get changed at boot time */ 17006fb6a36Sdv static uint_t pcf_fanout_mask = 0; 1717c478bd9Sstevel@tonic-gate 1727c478bd9Sstevel@tonic-gate struct pcf { 1737c478bd9Sstevel@tonic-gate kmutex_t pcf_lock; /* protects the structure */ 174f2b37d75Sfr uint_t pcf_count; /* page count */ 1757c478bd9Sstevel@tonic-gate uint_t pcf_wait; /* number of waiters */ 1767c478bd9Sstevel@tonic-gate uint_t pcf_block; /* pcgs flag to page_free() */ 1777c478bd9Sstevel@tonic-gate uint_t pcf_reserve; /* pages freed after pcf_block set */ 17806fb6a36Sdv uint_t pcf_fill[10]; /* to line up on the caches */ 1797c478bd9Sstevel@tonic-gate }; 1807c478bd9Sstevel@tonic-gate 18106fb6a36Sdv /* 18206fb6a36Sdv * PCF_INDEX hash needs to be dynamic (every so often the hash changes where 18306fb6a36Sdv * it will hash the cpu to). This is done to prevent a drain condition 18406fb6a36Sdv * from happening. This drain condition will occur when pcf_count decrement 18506fb6a36Sdv * occurs on cpu A and the increment of pcf_count always occurs on cpu B. An 18606fb6a36Sdv * example of this shows up with device interrupts. The dma buffer is allocated 18706fb6a36Sdv * by the cpu requesting the IO thus the pcf_count is decremented based on that. 18806fb6a36Sdv * When the memory is returned by the interrupt thread, the pcf_count will be 18906fb6a36Sdv * incremented based on the cpu servicing the interrupt. 19006fb6a36Sdv */ 19106fb6a36Sdv static struct pcf pcf[MAX_PCF_FANOUT]; 19206fb6a36Sdv #define PCF_INDEX() ((int)(((long)CPU->cpu_seqid) + \ 19306fb6a36Sdv (randtick() >> 24)) & (pcf_fanout_mask)) 19406fb6a36Sdv 19506fb6a36Sdv static int pcf_decrement_bucket(pgcnt_t); 19606fb6a36Sdv static int pcf_decrement_multiple(pgcnt_t *, pgcnt_t, int); 1977c478bd9Sstevel@tonic-gate 1987c478bd9Sstevel@tonic-gate kmutex_t pcgs_lock; /* serializes page_create_get_ */ 1997c478bd9Sstevel@tonic-gate kmutex_t pcgs_cagelock; /* serializes NOSLEEP cage allocs */ 2007c478bd9Sstevel@tonic-gate kmutex_t pcgs_wait_lock; /* used for delay in pcgs */ 2017c478bd9Sstevel@tonic-gate static kcondvar_t pcgs_cv; /* cv for delay in pcgs */ 2027c478bd9Sstevel@tonic-gate 2037c478bd9Sstevel@tonic-gate #ifdef VM_STATS 2047c478bd9Sstevel@tonic-gate 2057c478bd9Sstevel@tonic-gate /* 2067c478bd9Sstevel@tonic-gate * No locks, but so what, they are only statistics. 2077c478bd9Sstevel@tonic-gate */ 2087c478bd9Sstevel@tonic-gate 2097c478bd9Sstevel@tonic-gate static struct page_tcnt { 2107c478bd9Sstevel@tonic-gate int pc_free_cache; /* free's into cache list */ 2117c478bd9Sstevel@tonic-gate int pc_free_dontneed; /* free's with dontneed */ 2127c478bd9Sstevel@tonic-gate int pc_free_pageout; /* free's from pageout */ 2137c478bd9Sstevel@tonic-gate int pc_free_free; /* free's into free list */ 2147c478bd9Sstevel@tonic-gate int pc_free_pages; /* free's into large page free list */ 2157c478bd9Sstevel@tonic-gate int pc_destroy_pages; /* large page destroy's */ 2167c478bd9Sstevel@tonic-gate int pc_get_cache; /* get's from cache list */ 2177c478bd9Sstevel@tonic-gate int pc_get_free; /* get's from free list */ 2187c478bd9Sstevel@tonic-gate int pc_reclaim; /* reclaim's */ 2197c478bd9Sstevel@tonic-gate int pc_abortfree; /* abort's of free pages */ 2207c478bd9Sstevel@tonic-gate int pc_find_hit; /* find's that find page */ 2217c478bd9Sstevel@tonic-gate int pc_find_miss; /* find's that don't find page */ 2227c478bd9Sstevel@tonic-gate int pc_destroy_free; /* # of free pages destroyed */ 2237c478bd9Sstevel@tonic-gate #define PC_HASH_CNT (4*PAGE_HASHAVELEN) 2247c478bd9Sstevel@tonic-gate int pc_find_hashlen[PC_HASH_CNT+1]; 2257c478bd9Sstevel@tonic-gate int pc_addclaim_pages; 2267c478bd9Sstevel@tonic-gate int pc_subclaim_pages; 2277c478bd9Sstevel@tonic-gate int pc_free_replacement_page[2]; 2287c478bd9Sstevel@tonic-gate int pc_try_demote_pages[6]; 2297c478bd9Sstevel@tonic-gate int pc_demote_pages[2]; 2307c478bd9Sstevel@tonic-gate } pagecnt; 2317c478bd9Sstevel@tonic-gate 2327c478bd9Sstevel@tonic-gate uint_t hashin_count; 2337c478bd9Sstevel@tonic-gate uint_t hashin_not_held; 2347c478bd9Sstevel@tonic-gate uint_t hashin_already; 2357c478bd9Sstevel@tonic-gate 2367c478bd9Sstevel@tonic-gate uint_t hashout_count; 2377c478bd9Sstevel@tonic-gate uint_t hashout_not_held; 2387c478bd9Sstevel@tonic-gate 2397c478bd9Sstevel@tonic-gate uint_t page_create_count; 2407c478bd9Sstevel@tonic-gate uint_t page_create_not_enough; 2417c478bd9Sstevel@tonic-gate uint_t page_create_not_enough_again; 2427c478bd9Sstevel@tonic-gate uint_t page_create_zero; 2437c478bd9Sstevel@tonic-gate uint_t page_create_hashout; 2447c478bd9Sstevel@tonic-gate uint_t page_create_page_lock_failed; 2457c478bd9Sstevel@tonic-gate uint_t page_create_trylock_failed; 2467c478bd9Sstevel@tonic-gate uint_t page_create_found_one; 2477c478bd9Sstevel@tonic-gate uint_t page_create_hashin_failed; 2487c478bd9Sstevel@tonic-gate uint_t page_create_dropped_phm; 2497c478bd9Sstevel@tonic-gate 2507c478bd9Sstevel@tonic-gate uint_t page_create_new; 2517c478bd9Sstevel@tonic-gate uint_t page_create_exists; 2527c478bd9Sstevel@tonic-gate uint_t page_create_putbacks; 2537c478bd9Sstevel@tonic-gate uint_t page_create_overshoot; 2547c478bd9Sstevel@tonic-gate 2557c478bd9Sstevel@tonic-gate uint_t page_reclaim_zero; 2567c478bd9Sstevel@tonic-gate uint_t page_reclaim_zero_locked; 2577c478bd9Sstevel@tonic-gate 2587c478bd9Sstevel@tonic-gate uint_t page_rename_exists; 2597c478bd9Sstevel@tonic-gate uint_t page_rename_count; 2607c478bd9Sstevel@tonic-gate 2617c478bd9Sstevel@tonic-gate uint_t page_lookup_cnt[20]; 2627c478bd9Sstevel@tonic-gate uint_t page_lookup_nowait_cnt[10]; 2637c478bd9Sstevel@tonic-gate uint_t page_find_cnt; 2647c478bd9Sstevel@tonic-gate uint_t page_exists_cnt; 2657c478bd9Sstevel@tonic-gate uint_t page_exists_forreal_cnt; 2667c478bd9Sstevel@tonic-gate uint_t page_lookup_dev_cnt; 2677c478bd9Sstevel@tonic-gate uint_t get_cachelist_cnt; 2687c478bd9Sstevel@tonic-gate uint_t page_create_cnt[10]; 26978b03d3aSkchow uint_t alloc_pages[9]; 2707c478bd9Sstevel@tonic-gate uint_t page_exphcontg[19]; 2717c478bd9Sstevel@tonic-gate uint_t page_create_large_cnt[10]; 2727c478bd9Sstevel@tonic-gate 273e7c874afSJosef 'Jeff' Sipek #endif 2747c478bd9Sstevel@tonic-gate 275e7c874afSJosef 'Jeff' Sipek static inline page_t * 276e7c874afSJosef 'Jeff' Sipek page_hash_search(ulong_t index, vnode_t *vnode, u_offset_t off) 277e7c874afSJosef 'Jeff' Sipek { 278e7c874afSJosef 'Jeff' Sipek uint_t mylen = 0; 279e7c874afSJosef 'Jeff' Sipek page_t *page; 2807c478bd9Sstevel@tonic-gate 281e7c874afSJosef 'Jeff' Sipek for (page = page_hash[index]; page; page = page->p_hash, mylen++) 282e7c874afSJosef 'Jeff' Sipek if (page->p_vnode == vnode && page->p_offset == off) 283e7c874afSJosef 'Jeff' Sipek break; 2847c478bd9Sstevel@tonic-gate 285e7c874afSJosef 'Jeff' Sipek #ifdef VM_STATS 286e7c874afSJosef 'Jeff' Sipek if (page != NULL) 287e7c874afSJosef 'Jeff' Sipek pagecnt.pc_find_hit++; 288e7c874afSJosef 'Jeff' Sipek else 289e7c874afSJosef 'Jeff' Sipek pagecnt.pc_find_miss++; 2907c478bd9Sstevel@tonic-gate 291e7c874afSJosef 'Jeff' Sipek pagecnt.pc_find_hashlen[MIN(mylen, PC_HASH_CNT)]++; 292e7c874afSJosef 'Jeff' Sipek #endif 293e7c874afSJosef 'Jeff' Sipek 294e7c874afSJosef 'Jeff' Sipek return (page); 295e7c874afSJosef 'Jeff' Sipek } 2967c478bd9Sstevel@tonic-gate 2977c478bd9Sstevel@tonic-gate 2987c478bd9Sstevel@tonic-gate #ifdef DEBUG 2997c478bd9Sstevel@tonic-gate #define MEMSEG_SEARCH_STATS 3007c478bd9Sstevel@tonic-gate #endif 3017c478bd9Sstevel@tonic-gate 3027c478bd9Sstevel@tonic-gate #ifdef MEMSEG_SEARCH_STATS 3037c478bd9Sstevel@tonic-gate struct memseg_stats { 3047c478bd9Sstevel@tonic-gate uint_t nsearch; 3057c478bd9Sstevel@tonic-gate uint_t nlastwon; 3067c478bd9Sstevel@tonic-gate uint_t nhashwon; 3077c478bd9Sstevel@tonic-gate uint_t nnotfound; 3087c478bd9Sstevel@tonic-gate } memseg_stats; 3097c478bd9Sstevel@tonic-gate 3107c478bd9Sstevel@tonic-gate #define MEMSEG_STAT_INCR(v) \ 3111a5e258fSJosef 'Jeff' Sipek atomic_inc_32(&memseg_stats.v) 3127c478bd9Sstevel@tonic-gate #else 3137c478bd9Sstevel@tonic-gate #define MEMSEG_STAT_INCR(x) 3147c478bd9Sstevel@tonic-gate #endif 3157c478bd9Sstevel@tonic-gate 3167c478bd9Sstevel@tonic-gate struct memseg *memsegs; /* list of memory segments */ 3177c478bd9Sstevel@tonic-gate 3182be2af34Smec /* 3192be2af34Smec * /etc/system tunable to control large page allocation hueristic. 3202be2af34Smec * 3212be2af34Smec * Setting to LPAP_LOCAL will heavily prefer the local lgroup over remote lgroup 3222be2af34Smec * for large page allocation requests. If a large page is not readily 3232be2af34Smec * avaliable on the local freelists we will go through additional effort 3242be2af34Smec * to create a large page, potentially moving smaller pages around to coalesce 3252be2af34Smec * larger pages in the local lgroup. 3262be2af34Smec * Default value of LPAP_DEFAULT will go to remote freelists if large pages 3272be2af34Smec * are not readily available in the local lgroup. 3282be2af34Smec */ 3292be2af34Smec enum lpap { 3302be2af34Smec LPAP_DEFAULT, /* default large page allocation policy */ 3312be2af34Smec LPAP_LOCAL /* local large page allocation policy */ 3322be2af34Smec }; 3332be2af34Smec 3342be2af34Smec enum lpap lpg_alloc_prefer = LPAP_DEFAULT; 3357c478bd9Sstevel@tonic-gate 3367c478bd9Sstevel@tonic-gate static void page_init_mem_config(void); 3377c478bd9Sstevel@tonic-gate static int page_do_hashin(page_t *, vnode_t *, u_offset_t); 3387c478bd9Sstevel@tonic-gate static void page_do_hashout(page_t *); 3398b464eb8Smec static void page_capture_init(); 3408b464eb8Smec int page_capture_take_action(page_t *, uint_t, void *); 3417c478bd9Sstevel@tonic-gate 3427c478bd9Sstevel@tonic-gate static void page_demote_vp_pages(page_t *); 3437c478bd9Sstevel@tonic-gate 34406fb6a36Sdv 34506fb6a36Sdv void 34606fb6a36Sdv pcf_init(void) 34706fb6a36Sdv { 34806fb6a36Sdv if (boot_ncpus != -1) { 34906fb6a36Sdv pcf_fanout = boot_ncpus; 35006fb6a36Sdv } else { 35106fb6a36Sdv pcf_fanout = max_ncpus; 35206fb6a36Sdv } 35306fb6a36Sdv #ifdef sun4v 35406fb6a36Sdv /* 35506fb6a36Sdv * Force at least 4 buckets if possible for sun4v. 35606fb6a36Sdv */ 35706fb6a36Sdv pcf_fanout = MAX(pcf_fanout, 4); 35806fb6a36Sdv #endif /* sun4v */ 35906fb6a36Sdv 36006fb6a36Sdv /* 36106fb6a36Sdv * Round up to the nearest power of 2. 36206fb6a36Sdv */ 36306fb6a36Sdv pcf_fanout = MIN(pcf_fanout, MAX_PCF_FANOUT); 36406fb6a36Sdv if (!ISP2(pcf_fanout)) { 36506fb6a36Sdv pcf_fanout = 1 << highbit(pcf_fanout); 36606fb6a36Sdv 36706fb6a36Sdv if (pcf_fanout > MAX_PCF_FANOUT) { 36806fb6a36Sdv pcf_fanout = 1 << (highbit(MAX_PCF_FANOUT) - 1); 36906fb6a36Sdv } 37006fb6a36Sdv } 37106fb6a36Sdv pcf_fanout_mask = pcf_fanout - 1; 37206fb6a36Sdv } 37306fb6a36Sdv 3747c478bd9Sstevel@tonic-gate /* 3757c478bd9Sstevel@tonic-gate * vm subsystem related initialization 3767c478bd9Sstevel@tonic-gate */ 3777c478bd9Sstevel@tonic-gate void 3787c478bd9Sstevel@tonic-gate vm_init(void) 3797c478bd9Sstevel@tonic-gate { 3807c478bd9Sstevel@tonic-gate boolean_t callb_vm_cpr(void *, int); 3817c478bd9Sstevel@tonic-gate 3827c478bd9Sstevel@tonic-gate (void) callb_add(callb_vm_cpr, 0, CB_CL_CPR_VM, "vm"); 3837c478bd9Sstevel@tonic-gate page_init_mem_config(); 384db874c57Selowe page_retire_init(); 3850209230bSgjelinek vm_usage_init(); 3868b464eb8Smec page_capture_init(); 3877c478bd9Sstevel@tonic-gate } 3887c478bd9Sstevel@tonic-gate 3897c478bd9Sstevel@tonic-gate /* 3907c478bd9Sstevel@tonic-gate * This function is called at startup and when memory is added or deleted. 3917c478bd9Sstevel@tonic-gate */ 3927c478bd9Sstevel@tonic-gate void 3937c478bd9Sstevel@tonic-gate init_pages_pp_maximum() 3947c478bd9Sstevel@tonic-gate { 3957c478bd9Sstevel@tonic-gate static pgcnt_t p_min; 3967c478bd9Sstevel@tonic-gate static pgcnt_t pages_pp_maximum_startup; 3977c478bd9Sstevel@tonic-gate static pgcnt_t avrmem_delta; 3987c478bd9Sstevel@tonic-gate static int init_done; 3997c478bd9Sstevel@tonic-gate static int user_set; /* true if set in /etc/system */ 4007c478bd9Sstevel@tonic-gate 4017c478bd9Sstevel@tonic-gate if (init_done == 0) { 4027c478bd9Sstevel@tonic-gate 4037c478bd9Sstevel@tonic-gate /* If the user specified a value, save it */ 4047c478bd9Sstevel@tonic-gate if (pages_pp_maximum != 0) { 4057c478bd9Sstevel@tonic-gate user_set = 1; 4067c478bd9Sstevel@tonic-gate pages_pp_maximum_startup = pages_pp_maximum; 4077c478bd9Sstevel@tonic-gate } 4087c478bd9Sstevel@tonic-gate 4097c478bd9Sstevel@tonic-gate /* 4107c478bd9Sstevel@tonic-gate * Setting of pages_pp_maximum is based first time 4117c478bd9Sstevel@tonic-gate * on the value of availrmem just after the start-up 4127c478bd9Sstevel@tonic-gate * allocations. To preserve this relationship at run 4137c478bd9Sstevel@tonic-gate * time, use a delta from availrmem_initial. 4147c478bd9Sstevel@tonic-gate */ 4157c478bd9Sstevel@tonic-gate ASSERT(availrmem_initial >= availrmem); 4167c478bd9Sstevel@tonic-gate avrmem_delta = availrmem_initial - availrmem; 4177c478bd9Sstevel@tonic-gate 4187c478bd9Sstevel@tonic-gate /* The allowable floor of pages_pp_maximum */ 4197c478bd9Sstevel@tonic-gate p_min = tune.t_minarmem + 100; 4207c478bd9Sstevel@tonic-gate 4217c478bd9Sstevel@tonic-gate /* Make sure we don't come through here again. */ 4227c478bd9Sstevel@tonic-gate init_done = 1; 4237c478bd9Sstevel@tonic-gate } 4247c478bd9Sstevel@tonic-gate /* 4257c478bd9Sstevel@tonic-gate * Determine pages_pp_maximum, the number of currently available 4267c478bd9Sstevel@tonic-gate * pages (availrmem) that can't be `locked'. If not set by 4277c478bd9Sstevel@tonic-gate * the user, we set it to 4% of the currently available memory 4287c478bd9Sstevel@tonic-gate * plus 4MB. 4297c478bd9Sstevel@tonic-gate * But we also insist that it be greater than tune.t_minarmem; 4307c478bd9Sstevel@tonic-gate * otherwise a process could lock down a lot of memory, get swapped 4317c478bd9Sstevel@tonic-gate * out, and never have enough to get swapped back in. 4327c478bd9Sstevel@tonic-gate */ 4337c478bd9Sstevel@tonic-gate if (user_set) 4347c478bd9Sstevel@tonic-gate pages_pp_maximum = pages_pp_maximum_startup; 4357c478bd9Sstevel@tonic-gate else 4367c478bd9Sstevel@tonic-gate pages_pp_maximum = ((availrmem_initial - avrmem_delta) / 25) 4377c478bd9Sstevel@tonic-gate + btop(4 * 1024 * 1024); 4387c478bd9Sstevel@tonic-gate 4397c478bd9Sstevel@tonic-gate if (pages_pp_maximum <= p_min) { 4407c478bd9Sstevel@tonic-gate pages_pp_maximum = p_min; 4417c478bd9Sstevel@tonic-gate } 4427c478bd9Sstevel@tonic-gate } 4437c478bd9Sstevel@tonic-gate 444*0418219cSJerry Jelinek /* 445*0418219cSJerry Jelinek * In the past, we limited the maximum pages that could be gotten to essentially 446*0418219cSJerry Jelinek * 1/2 of the total pages on the system. However, this is too conservative for 447*0418219cSJerry Jelinek * some cases. For example, if we want to host a large virtual machine which 448*0418219cSJerry Jelinek * needs to use a significant portion of the system's memory. In practice, 449*0418219cSJerry Jelinek * allowing more than 1/2 of the total pages is fine, but becomes problematic 450*0418219cSJerry Jelinek * as we approach or exceed 75% of the pages on the system. Thus, we limit the 451*0418219cSJerry Jelinek * maximum to 23/32 of the total pages, which is ~72%. 452*0418219cSJerry Jelinek */ 4537c478bd9Sstevel@tonic-gate void 4547c478bd9Sstevel@tonic-gate set_max_page_get(pgcnt_t target_total_pages) 4557c478bd9Sstevel@tonic-gate { 456*0418219cSJerry Jelinek max_page_get = (target_total_pages >> 5) * 23; 457*0418219cSJerry Jelinek ASSERT3U(max_page_get, >, 0); 458*0418219cSJerry Jelinek } 459*0418219cSJerry Jelinek 460*0418219cSJerry Jelinek pgcnt_t 461*0418219cSJerry Jelinek get_max_page_get() 462*0418219cSJerry Jelinek { 463*0418219cSJerry Jelinek return (max_page_get); 4647c478bd9Sstevel@tonic-gate } 4657c478bd9Sstevel@tonic-gate 4667c478bd9Sstevel@tonic-gate static pgcnt_t pending_delete; 4677c478bd9Sstevel@tonic-gate 4687c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 4697c478bd9Sstevel@tonic-gate static void 4707c478bd9Sstevel@tonic-gate page_mem_config_post_add( 4717c478bd9Sstevel@tonic-gate void *arg, 4727c478bd9Sstevel@tonic-gate pgcnt_t delta_pages) 4737c478bd9Sstevel@tonic-gate { 4747c478bd9Sstevel@tonic-gate set_max_page_get(total_pages - pending_delete); 4757c478bd9Sstevel@tonic-gate init_pages_pp_maximum(); 4767c478bd9Sstevel@tonic-gate } 4777c478bd9Sstevel@tonic-gate 4787c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 4797c478bd9Sstevel@tonic-gate static int 4807c478bd9Sstevel@tonic-gate page_mem_config_pre_del( 4817c478bd9Sstevel@tonic-gate void *arg, 4827c478bd9Sstevel@tonic-gate pgcnt_t delta_pages) 4837c478bd9Sstevel@tonic-gate { 4847c478bd9Sstevel@tonic-gate pgcnt_t nv; 4857c478bd9Sstevel@tonic-gate 4867c478bd9Sstevel@tonic-gate nv = atomic_add_long_nv(&pending_delete, (spgcnt_t)delta_pages); 4877c478bd9Sstevel@tonic-gate set_max_page_get(total_pages - nv); 4887c478bd9Sstevel@tonic-gate return (0); 4897c478bd9Sstevel@tonic-gate } 4907c478bd9Sstevel@tonic-gate 4917c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 4927c478bd9Sstevel@tonic-gate static void 4937c478bd9Sstevel@tonic-gate page_mem_config_post_del( 4947c478bd9Sstevel@tonic-gate void *arg, 4957c478bd9Sstevel@tonic-gate pgcnt_t delta_pages, 4967c478bd9Sstevel@tonic-gate int cancelled) 4977c478bd9Sstevel@tonic-gate { 4987c478bd9Sstevel@tonic-gate pgcnt_t nv; 4997c478bd9Sstevel@tonic-gate 5007c478bd9Sstevel@tonic-gate nv = atomic_add_long_nv(&pending_delete, -(spgcnt_t)delta_pages); 5017c478bd9Sstevel@tonic-gate set_max_page_get(total_pages - nv); 5027c478bd9Sstevel@tonic-gate if (!cancelled) 5037c478bd9Sstevel@tonic-gate init_pages_pp_maximum(); 5047c478bd9Sstevel@tonic-gate } 5057c478bd9Sstevel@tonic-gate 5067c478bd9Sstevel@tonic-gate static kphysm_setup_vector_t page_mem_config_vec = { 5077c478bd9Sstevel@tonic-gate KPHYSM_SETUP_VECTOR_VERSION, 5087c478bd9Sstevel@tonic-gate page_mem_config_post_add, 5097c478bd9Sstevel@tonic-gate page_mem_config_pre_del, 5107c478bd9Sstevel@tonic-gate page_mem_config_post_del, 5117c478bd9Sstevel@tonic-gate }; 5127c478bd9Sstevel@tonic-gate 5137c478bd9Sstevel@tonic-gate static void 5147c478bd9Sstevel@tonic-gate page_init_mem_config(void) 5157c478bd9Sstevel@tonic-gate { 516d94ffb28Sjmcp int ret; 5177c478bd9Sstevel@tonic-gate 518d94ffb28Sjmcp ret = kphysm_setup_func_register(&page_mem_config_vec, (void *)NULL); 519d94ffb28Sjmcp ASSERT(ret == 0); 5207c478bd9Sstevel@tonic-gate } 5217c478bd9Sstevel@tonic-gate 5227c478bd9Sstevel@tonic-gate /* 5237c478bd9Sstevel@tonic-gate * Evenly spread out the PCF counters for large free pages 5247c478bd9Sstevel@tonic-gate */ 5257c478bd9Sstevel@tonic-gate static void 5267c478bd9Sstevel@tonic-gate page_free_large_ctr(pgcnt_t npages) 5277c478bd9Sstevel@tonic-gate { 5287c478bd9Sstevel@tonic-gate static struct pcf *p = pcf; 5297c478bd9Sstevel@tonic-gate pgcnt_t lump; 5307c478bd9Sstevel@tonic-gate 5317c478bd9Sstevel@tonic-gate freemem += npages; 5327c478bd9Sstevel@tonic-gate 53306fb6a36Sdv lump = roundup(npages, pcf_fanout) / pcf_fanout; 5347c478bd9Sstevel@tonic-gate 5357c478bd9Sstevel@tonic-gate while (npages > 0) { 5367c478bd9Sstevel@tonic-gate 5377c478bd9Sstevel@tonic-gate ASSERT(!p->pcf_block); 5387c478bd9Sstevel@tonic-gate 5397c478bd9Sstevel@tonic-gate if (lump < npages) { 5407c478bd9Sstevel@tonic-gate p->pcf_count += (uint_t)lump; 5417c478bd9Sstevel@tonic-gate npages -= lump; 5427c478bd9Sstevel@tonic-gate } else { 5437c478bd9Sstevel@tonic-gate p->pcf_count += (uint_t)npages; 5447c478bd9Sstevel@tonic-gate npages = 0; 5457c478bd9Sstevel@tonic-gate } 5467c478bd9Sstevel@tonic-gate 5477c478bd9Sstevel@tonic-gate ASSERT(!p->pcf_wait); 5487c478bd9Sstevel@tonic-gate 54906fb6a36Sdv if (++p > &pcf[pcf_fanout - 1]) 5507c478bd9Sstevel@tonic-gate p = pcf; 5517c478bd9Sstevel@tonic-gate } 5527c478bd9Sstevel@tonic-gate 5537c478bd9Sstevel@tonic-gate ASSERT(npages == 0); 5547c478bd9Sstevel@tonic-gate } 5557c478bd9Sstevel@tonic-gate 5567c478bd9Sstevel@tonic-gate /* 557da6c28aaSamw * Add a physical chunk of memory to the system free lists during startup. 5587c478bd9Sstevel@tonic-gate * Platform specific startup() allocates the memory for the page structs. 5597c478bd9Sstevel@tonic-gate * 5607c478bd9Sstevel@tonic-gate * num - number of page structures 5617c478bd9Sstevel@tonic-gate * base - page number (pfn) to be associated with the first page. 5627c478bd9Sstevel@tonic-gate * 5637c478bd9Sstevel@tonic-gate * Since we are doing this during startup (ie. single threaded), we will 5647c478bd9Sstevel@tonic-gate * use shortcut routines to avoid any locking overhead while putting all 5657c478bd9Sstevel@tonic-gate * these pages on the freelists. 5667c478bd9Sstevel@tonic-gate * 5677c478bd9Sstevel@tonic-gate * NOTE: Any changes performed to page_free(), must also be performed to 5687c478bd9Sstevel@tonic-gate * add_physmem() since this is how we initialize all page_t's at 5697c478bd9Sstevel@tonic-gate * boot time. 5707c478bd9Sstevel@tonic-gate */ 5717c478bd9Sstevel@tonic-gate void 5727c478bd9Sstevel@tonic-gate add_physmem( 5737c478bd9Sstevel@tonic-gate page_t *pp, 5747c478bd9Sstevel@tonic-gate pgcnt_t num, 5757c478bd9Sstevel@tonic-gate pfn_t pnum) 5767c478bd9Sstevel@tonic-gate { 5777c478bd9Sstevel@tonic-gate page_t *root = NULL; 5787c478bd9Sstevel@tonic-gate uint_t szc = page_num_pagesizes() - 1; 5797c478bd9Sstevel@tonic-gate pgcnt_t large = page_get_pagecnt(szc); 5807c478bd9Sstevel@tonic-gate pgcnt_t cnt = 0; 5817c478bd9Sstevel@tonic-gate 5827c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_INIT, 5836e4dd838Smec "add_physmem:pp %p num %lu", pp, num); 5847c478bd9Sstevel@tonic-gate 5857c478bd9Sstevel@tonic-gate /* 5867c478bd9Sstevel@tonic-gate * Arbitrarily limit the max page_get request 5877c478bd9Sstevel@tonic-gate * to 1/2 of the page structs we have. 5887c478bd9Sstevel@tonic-gate */ 5897c478bd9Sstevel@tonic-gate total_pages += num; 5907c478bd9Sstevel@tonic-gate set_max_page_get(total_pages); 5917c478bd9Sstevel@tonic-gate 592e21bae1bSkchow PLCNT_MODIFY_MAX(pnum, (long)num); 593e21bae1bSkchow 5947c478bd9Sstevel@tonic-gate /* 5957c478bd9Sstevel@tonic-gate * The physical space for the pages array 5967c478bd9Sstevel@tonic-gate * representing ram pages has already been 5977c478bd9Sstevel@tonic-gate * allocated. Here we initialize each lock 5987c478bd9Sstevel@tonic-gate * in the page structure, and put each on 5997c478bd9Sstevel@tonic-gate * the free list 6007c478bd9Sstevel@tonic-gate */ 601affbd3ccSkchow for (; num; pp++, pnum++, num--) { 6027c478bd9Sstevel@tonic-gate 6037c478bd9Sstevel@tonic-gate /* 6047c478bd9Sstevel@tonic-gate * this needs to fill in the page number 6057c478bd9Sstevel@tonic-gate * and do any other arch specific initialization 6067c478bd9Sstevel@tonic-gate */ 6077c478bd9Sstevel@tonic-gate add_physmem_cb(pp, pnum); 6087c478bd9Sstevel@tonic-gate 60907b65a64Saguzovsk pp->p_lckcnt = 0; 61007b65a64Saguzovsk pp->p_cowcnt = 0; 61107b65a64Saguzovsk pp->p_slckcnt = 0; 61207b65a64Saguzovsk 6137c478bd9Sstevel@tonic-gate /* 6147c478bd9Sstevel@tonic-gate * Initialize the page lock as unlocked, since nobody 6157c478bd9Sstevel@tonic-gate * can see or access this page yet. 6167c478bd9Sstevel@tonic-gate */ 6177c478bd9Sstevel@tonic-gate pp->p_selock = 0; 6187c478bd9Sstevel@tonic-gate 6197c478bd9Sstevel@tonic-gate /* 6207c478bd9Sstevel@tonic-gate * Initialize IO lock 6217c478bd9Sstevel@tonic-gate */ 6227c478bd9Sstevel@tonic-gate page_iolock_init(pp); 6237c478bd9Sstevel@tonic-gate 6247c478bd9Sstevel@tonic-gate /* 6257c478bd9Sstevel@tonic-gate * initialize other fields in the page_t 6267c478bd9Sstevel@tonic-gate */ 6277c478bd9Sstevel@tonic-gate PP_SETFREE(pp); 6289d0d62adSJason Beloro page_clr_all_props(pp); 6297c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 6307c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)-1; 6317c478bd9Sstevel@tonic-gate pp->p_next = pp; 6327c478bd9Sstevel@tonic-gate pp->p_prev = pp; 6337c478bd9Sstevel@tonic-gate 6347c478bd9Sstevel@tonic-gate /* 6357c478bd9Sstevel@tonic-gate * Simple case: System doesn't support large pages. 6367c478bd9Sstevel@tonic-gate */ 6377c478bd9Sstevel@tonic-gate if (szc == 0) { 6387c478bd9Sstevel@tonic-gate pp->p_szc = 0; 6397c478bd9Sstevel@tonic-gate page_free_at_startup(pp); 6407c478bd9Sstevel@tonic-gate continue; 6417c478bd9Sstevel@tonic-gate } 6427c478bd9Sstevel@tonic-gate 6437c478bd9Sstevel@tonic-gate /* 6447c478bd9Sstevel@tonic-gate * Handle unaligned pages, we collect them up onto 6457c478bd9Sstevel@tonic-gate * the root page until we have a full large page. 6467c478bd9Sstevel@tonic-gate */ 6477c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pnum, large)) { 6487c478bd9Sstevel@tonic-gate 6497c478bd9Sstevel@tonic-gate /* 6507c478bd9Sstevel@tonic-gate * If not in a large page, 6517c478bd9Sstevel@tonic-gate * just free as small page. 6527c478bd9Sstevel@tonic-gate */ 6537c478bd9Sstevel@tonic-gate if (root == NULL) { 6547c478bd9Sstevel@tonic-gate pp->p_szc = 0; 6557c478bd9Sstevel@tonic-gate page_free_at_startup(pp); 6567c478bd9Sstevel@tonic-gate continue; 6577c478bd9Sstevel@tonic-gate } 6587c478bd9Sstevel@tonic-gate 6597c478bd9Sstevel@tonic-gate /* 6607c478bd9Sstevel@tonic-gate * Link a constituent page into the large page. 6617c478bd9Sstevel@tonic-gate */ 6627c478bd9Sstevel@tonic-gate pp->p_szc = szc; 6637c478bd9Sstevel@tonic-gate page_list_concat(&root, &pp); 6647c478bd9Sstevel@tonic-gate 6657c478bd9Sstevel@tonic-gate /* 6667c478bd9Sstevel@tonic-gate * When large page is fully formed, free it. 6677c478bd9Sstevel@tonic-gate */ 6687c478bd9Sstevel@tonic-gate if (++cnt == large) { 6697c478bd9Sstevel@tonic-gate page_free_large_ctr(cnt); 6707c478bd9Sstevel@tonic-gate page_list_add_pages(root, PG_LIST_ISINIT); 6717c478bd9Sstevel@tonic-gate root = NULL; 6727c478bd9Sstevel@tonic-gate cnt = 0; 6737c478bd9Sstevel@tonic-gate } 6747c478bd9Sstevel@tonic-gate continue; 6757c478bd9Sstevel@tonic-gate } 6767c478bd9Sstevel@tonic-gate 6777c478bd9Sstevel@tonic-gate /* 6787c478bd9Sstevel@tonic-gate * At this point we have a page number which 6797c478bd9Sstevel@tonic-gate * is aligned. We assert that we aren't already 6807c478bd9Sstevel@tonic-gate * in a different large page. 6817c478bd9Sstevel@tonic-gate */ 6827c478bd9Sstevel@tonic-gate ASSERT(IS_P2ALIGNED(pnum, large)); 6837c478bd9Sstevel@tonic-gate ASSERT(root == NULL && cnt == 0); 6847c478bd9Sstevel@tonic-gate 6857c478bd9Sstevel@tonic-gate /* 6867c478bd9Sstevel@tonic-gate * If insufficient number of pages left to form 6877c478bd9Sstevel@tonic-gate * a large page, just free the small page. 6887c478bd9Sstevel@tonic-gate */ 6897c478bd9Sstevel@tonic-gate if (num < large) { 6907c478bd9Sstevel@tonic-gate pp->p_szc = 0; 6917c478bd9Sstevel@tonic-gate page_free_at_startup(pp); 6927c478bd9Sstevel@tonic-gate continue; 6937c478bd9Sstevel@tonic-gate } 6947c478bd9Sstevel@tonic-gate 6957c478bd9Sstevel@tonic-gate /* 6967c478bd9Sstevel@tonic-gate * Otherwise start a new large page. 6977c478bd9Sstevel@tonic-gate */ 6987c478bd9Sstevel@tonic-gate pp->p_szc = szc; 6997c478bd9Sstevel@tonic-gate cnt++; 7007c478bd9Sstevel@tonic-gate root = pp; 7017c478bd9Sstevel@tonic-gate } 7027c478bd9Sstevel@tonic-gate ASSERT(root == NULL && cnt == 0); 7037c478bd9Sstevel@tonic-gate } 7047c478bd9Sstevel@tonic-gate 7057c478bd9Sstevel@tonic-gate /* 7067c478bd9Sstevel@tonic-gate * Find a page representing the specified [vp, offset]. 7077c478bd9Sstevel@tonic-gate * If we find the page but it is intransit coming in, 7087c478bd9Sstevel@tonic-gate * it will have an "exclusive" lock and we wait for 7097c478bd9Sstevel@tonic-gate * the i/o to complete. A page found on the free list 7107c478bd9Sstevel@tonic-gate * is always reclaimed and then locked. On success, the page 7117c478bd9Sstevel@tonic-gate * is locked, its data is valid and it isn't on the free 7127c478bd9Sstevel@tonic-gate * list, while a NULL is returned if the page doesn't exist. 7137c478bd9Sstevel@tonic-gate */ 7147c478bd9Sstevel@tonic-gate page_t * 7157c478bd9Sstevel@tonic-gate page_lookup(vnode_t *vp, u_offset_t off, se_t se) 7167c478bd9Sstevel@tonic-gate { 7177c478bd9Sstevel@tonic-gate return (page_lookup_create(vp, off, se, NULL, NULL, 0)); 7187c478bd9Sstevel@tonic-gate } 7197c478bd9Sstevel@tonic-gate 7207c478bd9Sstevel@tonic-gate /* 7217c478bd9Sstevel@tonic-gate * Find a page representing the specified [vp, offset]. 7227c478bd9Sstevel@tonic-gate * We either return the one we found or, if passed in, 7237c478bd9Sstevel@tonic-gate * create one with identity of [vp, offset] of the 724da6c28aaSamw * pre-allocated page. If we find existing page but it is 7257c478bd9Sstevel@tonic-gate * intransit coming in, it will have an "exclusive" lock 7267c478bd9Sstevel@tonic-gate * and we wait for the i/o to complete. A page found on 7277c478bd9Sstevel@tonic-gate * the free list is always reclaimed and then locked. 7287c478bd9Sstevel@tonic-gate * On success, the page is locked, its data is valid and 7297c478bd9Sstevel@tonic-gate * it isn't on the free list, while a NULL is returned 7307c478bd9Sstevel@tonic-gate * if the page doesn't exist and newpp is NULL; 7317c478bd9Sstevel@tonic-gate */ 7327c478bd9Sstevel@tonic-gate page_t * 7337c478bd9Sstevel@tonic-gate page_lookup_create( 7347c478bd9Sstevel@tonic-gate vnode_t *vp, 7357c478bd9Sstevel@tonic-gate u_offset_t off, 7367c478bd9Sstevel@tonic-gate se_t se, 7377c478bd9Sstevel@tonic-gate page_t *newpp, 7387c478bd9Sstevel@tonic-gate spgcnt_t *nrelocp, 7397c478bd9Sstevel@tonic-gate int flags) 7407c478bd9Sstevel@tonic-gate { 7417c478bd9Sstevel@tonic-gate page_t *pp; 7427c478bd9Sstevel@tonic-gate kmutex_t *phm; 7437c478bd9Sstevel@tonic-gate ulong_t index; 7447c478bd9Sstevel@tonic-gate uint_t hash_locked; 7457c478bd9Sstevel@tonic-gate uint_t es; 7467c478bd9Sstevel@tonic-gate 7477c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 7487c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[0]); 7497c478bd9Sstevel@tonic-gate ASSERT(newpp ? PAGE_EXCL(newpp) : 1); 7507c478bd9Sstevel@tonic-gate 7517c478bd9Sstevel@tonic-gate /* 7527c478bd9Sstevel@tonic-gate * Acquire the appropriate page hash lock since 7537c478bd9Sstevel@tonic-gate * we have to search the hash list. Pages that 7547c478bd9Sstevel@tonic-gate * hash to this list can't change identity while 7557c478bd9Sstevel@tonic-gate * this lock is held. 7567c478bd9Sstevel@tonic-gate */ 7577c478bd9Sstevel@tonic-gate hash_locked = 0; 7587c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 7597c478bd9Sstevel@tonic-gate phm = NULL; 7607c478bd9Sstevel@tonic-gate top: 761e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 7627c478bd9Sstevel@tonic-gate if (pp != NULL) { 7637c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[1]); 7647c478bd9Sstevel@tonic-gate es = (newpp != NULL) ? 1 : 0; 7657c478bd9Sstevel@tonic-gate es |= flags; 7667c478bd9Sstevel@tonic-gate if (!hash_locked) { 7677c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[2]); 7687c478bd9Sstevel@tonic-gate if (!page_try_reclaim_lock(pp, se, es)) { 7697c478bd9Sstevel@tonic-gate /* 7707c478bd9Sstevel@tonic-gate * On a miss, acquire the phm. Then 7717c478bd9Sstevel@tonic-gate * next time, page_lock() will be called, 7727c478bd9Sstevel@tonic-gate * causing a wait if the page is busy. 7737c478bd9Sstevel@tonic-gate * just looping with page_trylock() would 7747c478bd9Sstevel@tonic-gate * get pretty boring. 7757c478bd9Sstevel@tonic-gate */ 7767c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[3]); 7777c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 7787c478bd9Sstevel@tonic-gate mutex_enter(phm); 7797c478bd9Sstevel@tonic-gate hash_locked = 1; 7807c478bd9Sstevel@tonic-gate goto top; 7817c478bd9Sstevel@tonic-gate } 7827c478bd9Sstevel@tonic-gate } else { 7837c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[4]); 7847c478bd9Sstevel@tonic-gate if (!page_lock_es(pp, se, phm, P_RECLAIM, es)) { 7857c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[5]); 7867c478bd9Sstevel@tonic-gate goto top; 7877c478bd9Sstevel@tonic-gate } 7887c478bd9Sstevel@tonic-gate } 7897c478bd9Sstevel@tonic-gate 7907c478bd9Sstevel@tonic-gate /* 7917c478bd9Sstevel@tonic-gate * Since `pp' is locked it can not change identity now. 7927c478bd9Sstevel@tonic-gate * Reconfirm we locked the correct page. 7937c478bd9Sstevel@tonic-gate * 7947c478bd9Sstevel@tonic-gate * Both the p_vnode and p_offset *must* be cast volatile 795e7c874afSJosef 'Jeff' Sipek * to force a reload of their values: The page_hash_search 796e7c874afSJosef 'Jeff' Sipek * function will have stuffed p_vnode and p_offset into 7977c478bd9Sstevel@tonic-gate * registers before calling page_trylock(); another thread, 7987c478bd9Sstevel@tonic-gate * actually holding the hash lock, could have changed the 7997c478bd9Sstevel@tonic-gate * page's identity in memory, but our registers would not 8007c478bd9Sstevel@tonic-gate * be changed, fooling the reconfirmation. If the hash 8017c478bd9Sstevel@tonic-gate * lock was held during the search, the casting would 8027c478bd9Sstevel@tonic-gate * not be needed. 8037c478bd9Sstevel@tonic-gate */ 8047c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[6]); 8057c478bd9Sstevel@tonic-gate if (((volatile struct vnode *)(pp->p_vnode) != vp) || 8067c478bd9Sstevel@tonic-gate ((volatile u_offset_t)(pp->p_offset) != off)) { 8077c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[7]); 8087c478bd9Sstevel@tonic-gate if (hash_locked) { 8097c478bd9Sstevel@tonic-gate panic("page_lookup_create: lost page %p", 8107c478bd9Sstevel@tonic-gate (void *)pp); 8117c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 8127c478bd9Sstevel@tonic-gate } 8137c478bd9Sstevel@tonic-gate page_unlock(pp); 8147c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 8157c478bd9Sstevel@tonic-gate mutex_enter(phm); 8167c478bd9Sstevel@tonic-gate hash_locked = 1; 8177c478bd9Sstevel@tonic-gate goto top; 8187c478bd9Sstevel@tonic-gate } 8197c478bd9Sstevel@tonic-gate 8207c478bd9Sstevel@tonic-gate /* 8217c478bd9Sstevel@tonic-gate * If page_trylock() was called, then pp may still be on 8227c478bd9Sstevel@tonic-gate * the cachelist (can't be on the free list, it would not 8237c478bd9Sstevel@tonic-gate * have been found in the search). If it is on the 8247c478bd9Sstevel@tonic-gate * cachelist it must be pulled now. To pull the page from 8257c478bd9Sstevel@tonic-gate * the cachelist, it must be exclusively locked. 8267c478bd9Sstevel@tonic-gate * 8277c478bd9Sstevel@tonic-gate * The other big difference between page_trylock() and 8287c478bd9Sstevel@tonic-gate * page_lock(), is that page_lock() will pull the 8297c478bd9Sstevel@tonic-gate * page from whatever free list (the cache list in this 8307c478bd9Sstevel@tonic-gate * case) the page is on. If page_trylock() was used 8317c478bd9Sstevel@tonic-gate * above, then we have to do the reclaim ourselves. 8327c478bd9Sstevel@tonic-gate */ 8337c478bd9Sstevel@tonic-gate if ((!hash_locked) && (PP_ISFREE(pp))) { 8347c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp) == 0); 8357c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[8]); 8367c478bd9Sstevel@tonic-gate 8377c478bd9Sstevel@tonic-gate /* 8387c478bd9Sstevel@tonic-gate * page_relcaim will insure that we 8397c478bd9Sstevel@tonic-gate * have this page exclusively 8407c478bd9Sstevel@tonic-gate */ 8417c478bd9Sstevel@tonic-gate 8427c478bd9Sstevel@tonic-gate if (!page_reclaim(pp, NULL)) { 8437c478bd9Sstevel@tonic-gate /* 8447c478bd9Sstevel@tonic-gate * Page_reclaim dropped whatever lock 8457c478bd9Sstevel@tonic-gate * we held. 8467c478bd9Sstevel@tonic-gate */ 8477c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[9]); 8487c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 8497c478bd9Sstevel@tonic-gate mutex_enter(phm); 8507c478bd9Sstevel@tonic-gate hash_locked = 1; 8517c478bd9Sstevel@tonic-gate goto top; 8527c478bd9Sstevel@tonic-gate } else if (se == SE_SHARED && newpp == NULL) { 8537c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[10]); 8547c478bd9Sstevel@tonic-gate page_downgrade(pp); 8557c478bd9Sstevel@tonic-gate } 8567c478bd9Sstevel@tonic-gate } 8577c478bd9Sstevel@tonic-gate 8587c478bd9Sstevel@tonic-gate if (hash_locked) { 8597c478bd9Sstevel@tonic-gate mutex_exit(phm); 8607c478bd9Sstevel@tonic-gate } 8617c478bd9Sstevel@tonic-gate 8627c478bd9Sstevel@tonic-gate if (newpp != NULL && pp->p_szc < newpp->p_szc && 8637c478bd9Sstevel@tonic-gate PAGE_EXCL(pp) && nrelocp != NULL) { 8647c478bd9Sstevel@tonic-gate ASSERT(nrelocp != NULL); 8657c478bd9Sstevel@tonic-gate (void) page_relocate(&pp, &newpp, 1, 1, nrelocp, 8667c478bd9Sstevel@tonic-gate NULL); 8677c478bd9Sstevel@tonic-gate if (*nrelocp > 0) { 8687c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(*nrelocp == 1, 8697c478bd9Sstevel@tonic-gate page_lookup_cnt[11]); 8707c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(*nrelocp > 1, 8717c478bd9Sstevel@tonic-gate page_lookup_cnt[12]); 8727c478bd9Sstevel@tonic-gate pp = newpp; 8737c478bd9Sstevel@tonic-gate se = SE_EXCL; 8747c478bd9Sstevel@tonic-gate } else { 8757c478bd9Sstevel@tonic-gate if (se == SE_SHARED) { 8767c478bd9Sstevel@tonic-gate page_downgrade(pp); 8777c478bd9Sstevel@tonic-gate } 8787c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[13]); 8797c478bd9Sstevel@tonic-gate } 8807c478bd9Sstevel@tonic-gate } else if (newpp != NULL && nrelocp != NULL) { 8817c478bd9Sstevel@tonic-gate if (PAGE_EXCL(pp) && se == SE_SHARED) { 8827c478bd9Sstevel@tonic-gate page_downgrade(pp); 8837c478bd9Sstevel@tonic-gate } 8847c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(pp->p_szc < newpp->p_szc, 8857c478bd9Sstevel@tonic-gate page_lookup_cnt[14]); 8867c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(pp->p_szc == newpp->p_szc, 8877c478bd9Sstevel@tonic-gate page_lookup_cnt[15]); 8887c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(pp->p_szc > newpp->p_szc, 8897c478bd9Sstevel@tonic-gate page_lookup_cnt[16]); 8907c478bd9Sstevel@tonic-gate } else if (newpp != NULL && PAGE_EXCL(pp)) { 8917c478bd9Sstevel@tonic-gate se = SE_EXCL; 8927c478bd9Sstevel@tonic-gate } 8937c478bd9Sstevel@tonic-gate } else if (!hash_locked) { 8947c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[17]); 8957c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 8967c478bd9Sstevel@tonic-gate mutex_enter(phm); 8977c478bd9Sstevel@tonic-gate hash_locked = 1; 8987c478bd9Sstevel@tonic-gate goto top; 8997c478bd9Sstevel@tonic-gate } else if (newpp != NULL) { 9007c478bd9Sstevel@tonic-gate /* 9017c478bd9Sstevel@tonic-gate * If we have a preallocated page then 9027c478bd9Sstevel@tonic-gate * insert it now and basically behave like 9037c478bd9Sstevel@tonic-gate * page_create. 9047c478bd9Sstevel@tonic-gate */ 9057c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[18]); 9067c478bd9Sstevel@tonic-gate /* 9077c478bd9Sstevel@tonic-gate * Since we hold the page hash mutex and 9087c478bd9Sstevel@tonic-gate * just searched for this page, page_hashin 9097c478bd9Sstevel@tonic-gate * had better not fail. If it does, that 9107c478bd9Sstevel@tonic-gate * means some thread did not follow the 9117c478bd9Sstevel@tonic-gate * page hash mutex rules. Panic now and 9127c478bd9Sstevel@tonic-gate * get it over with. As usual, go down 9137c478bd9Sstevel@tonic-gate * holding all the locks. 9147c478bd9Sstevel@tonic-gate */ 9157c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 9167c478bd9Sstevel@tonic-gate if (!page_hashin(newpp, vp, off, phm)) { 9177c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 9187c478bd9Sstevel@tonic-gate panic("page_lookup_create: hashin failed %p %p %llx %p", 9197c478bd9Sstevel@tonic-gate (void *)newpp, (void *)vp, off, (void *)phm); 9207c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 9217c478bd9Sstevel@tonic-gate } 9227c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 9237c478bd9Sstevel@tonic-gate mutex_exit(phm); 9247c478bd9Sstevel@tonic-gate phm = NULL; 9257c478bd9Sstevel@tonic-gate page_set_props(newpp, P_REF); 9267c478bd9Sstevel@tonic-gate page_io_lock(newpp); 9277c478bd9Sstevel@tonic-gate pp = newpp; 9287c478bd9Sstevel@tonic-gate se = SE_EXCL; 9297c478bd9Sstevel@tonic-gate } else { 9307c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[19]); 9317c478bd9Sstevel@tonic-gate mutex_exit(phm); 9327c478bd9Sstevel@tonic-gate } 9337c478bd9Sstevel@tonic-gate 9347c478bd9Sstevel@tonic-gate ASSERT(pp ? PAGE_LOCKED_SE(pp, se) : 1); 9357c478bd9Sstevel@tonic-gate 9367c478bd9Sstevel@tonic-gate ASSERT(pp ? ((PP_ISFREE(pp) == 0) && (PP_ISAGED(pp) == 0)) : 1); 9377c478bd9Sstevel@tonic-gate 9387c478bd9Sstevel@tonic-gate return (pp); 9397c478bd9Sstevel@tonic-gate } 9407c478bd9Sstevel@tonic-gate 9417c478bd9Sstevel@tonic-gate /* 9427c478bd9Sstevel@tonic-gate * Search the hash list for the page representing the 9437c478bd9Sstevel@tonic-gate * specified [vp, offset] and return it locked. Skip 9447c478bd9Sstevel@tonic-gate * free pages and pages that cannot be locked as requested. 9457c478bd9Sstevel@tonic-gate * Used while attempting to kluster pages. 9467c478bd9Sstevel@tonic-gate */ 9477c478bd9Sstevel@tonic-gate page_t * 9487c478bd9Sstevel@tonic-gate page_lookup_nowait(vnode_t *vp, u_offset_t off, se_t se) 9497c478bd9Sstevel@tonic-gate { 9507c478bd9Sstevel@tonic-gate page_t *pp; 9517c478bd9Sstevel@tonic-gate kmutex_t *phm; 9527c478bd9Sstevel@tonic-gate ulong_t index; 9537c478bd9Sstevel@tonic-gate uint_t locked; 9547c478bd9Sstevel@tonic-gate 9557c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 9567c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[0]); 9577c478bd9Sstevel@tonic-gate 9587c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 959e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 9607c478bd9Sstevel@tonic-gate locked = 0; 9617c478bd9Sstevel@tonic-gate if (pp == NULL) { 9627c478bd9Sstevel@tonic-gate top: 9637c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[1]); 9647c478bd9Sstevel@tonic-gate locked = 1; 9657c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 9667c478bd9Sstevel@tonic-gate mutex_enter(phm); 967e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 9687c478bd9Sstevel@tonic-gate } 9697c478bd9Sstevel@tonic-gate 9707c478bd9Sstevel@tonic-gate if (pp == NULL || PP_ISFREE(pp)) { 9717c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[2]); 9727c478bd9Sstevel@tonic-gate pp = NULL; 9737c478bd9Sstevel@tonic-gate } else { 9747c478bd9Sstevel@tonic-gate if (!page_trylock(pp, se)) { 9757c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[3]); 9767c478bd9Sstevel@tonic-gate pp = NULL; 9777c478bd9Sstevel@tonic-gate } else { 9787c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[4]); 9797c478bd9Sstevel@tonic-gate /* 9807c478bd9Sstevel@tonic-gate * See the comment in page_lookup() 9817c478bd9Sstevel@tonic-gate */ 9827c478bd9Sstevel@tonic-gate if (((volatile struct vnode *)(pp->p_vnode) != vp) || 9837c478bd9Sstevel@tonic-gate ((u_offset_t)(pp->p_offset) != off)) { 9847c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[5]); 9857c478bd9Sstevel@tonic-gate if (locked) { 9867c478bd9Sstevel@tonic-gate panic("page_lookup_nowait %p", 9877c478bd9Sstevel@tonic-gate (void *)pp); 9887c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 9897c478bd9Sstevel@tonic-gate } 9907c478bd9Sstevel@tonic-gate page_unlock(pp); 9917c478bd9Sstevel@tonic-gate goto top; 9927c478bd9Sstevel@tonic-gate } 9937c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 9947c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[6]); 9957c478bd9Sstevel@tonic-gate page_unlock(pp); 9967c478bd9Sstevel@tonic-gate pp = NULL; 9977c478bd9Sstevel@tonic-gate } 9987c478bd9Sstevel@tonic-gate } 9997c478bd9Sstevel@tonic-gate } 10007c478bd9Sstevel@tonic-gate if (locked) { 10017c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[7]); 10027c478bd9Sstevel@tonic-gate mutex_exit(phm); 10037c478bd9Sstevel@tonic-gate } 10047c478bd9Sstevel@tonic-gate 10057c478bd9Sstevel@tonic-gate ASSERT(pp ? PAGE_LOCKED_SE(pp, se) : 1); 10067c478bd9Sstevel@tonic-gate 10077c478bd9Sstevel@tonic-gate return (pp); 10087c478bd9Sstevel@tonic-gate } 10097c478bd9Sstevel@tonic-gate 10107c478bd9Sstevel@tonic-gate /* 10117c478bd9Sstevel@tonic-gate * Search the hash list for a page with the specified [vp, off] 10127c478bd9Sstevel@tonic-gate * that is known to exist and is already locked. This routine 10137c478bd9Sstevel@tonic-gate * is typically used by segment SOFTUNLOCK routines. 10147c478bd9Sstevel@tonic-gate */ 10157c478bd9Sstevel@tonic-gate page_t * 10167c478bd9Sstevel@tonic-gate page_find(vnode_t *vp, u_offset_t off) 10177c478bd9Sstevel@tonic-gate { 10187c478bd9Sstevel@tonic-gate page_t *pp; 10197c478bd9Sstevel@tonic-gate kmutex_t *phm; 10207c478bd9Sstevel@tonic-gate ulong_t index; 10217c478bd9Sstevel@tonic-gate 10227c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 10237c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_find_cnt); 10247c478bd9Sstevel@tonic-gate 10257c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 10267c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 10277c478bd9Sstevel@tonic-gate 10287c478bd9Sstevel@tonic-gate mutex_enter(phm); 1029e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 10307c478bd9Sstevel@tonic-gate mutex_exit(phm); 10317c478bd9Sstevel@tonic-gate 10324fc2445aSelowe ASSERT(pp == NULL || PAGE_LOCKED(pp) || panicstr); 10337c478bd9Sstevel@tonic-gate return (pp); 10347c478bd9Sstevel@tonic-gate } 10357c478bd9Sstevel@tonic-gate 10367c478bd9Sstevel@tonic-gate /* 10377c478bd9Sstevel@tonic-gate * Determine whether a page with the specified [vp, off] 10387c478bd9Sstevel@tonic-gate * currently exists in the system. Obviously this should 10397c478bd9Sstevel@tonic-gate * only be considered as a hint since nothing prevents the 10407c478bd9Sstevel@tonic-gate * page from disappearing or appearing immediately after 10417c478bd9Sstevel@tonic-gate * the return from this routine. Subsequently, we don't 10427c478bd9Sstevel@tonic-gate * even bother to lock the list. 10437c478bd9Sstevel@tonic-gate */ 10447c478bd9Sstevel@tonic-gate page_t * 10457c478bd9Sstevel@tonic-gate page_exists(vnode_t *vp, u_offset_t off) 10467c478bd9Sstevel@tonic-gate { 10477c478bd9Sstevel@tonic-gate ulong_t index; 10487c478bd9Sstevel@tonic-gate 10497c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 10507c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exists_cnt); 10517c478bd9Sstevel@tonic-gate 10527c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 10537c478bd9Sstevel@tonic-gate 1054e7c874afSJosef 'Jeff' Sipek return (page_hash_search(index, vp, off)); 10557c478bd9Sstevel@tonic-gate } 10567c478bd9Sstevel@tonic-gate 10577c478bd9Sstevel@tonic-gate /* 10587c478bd9Sstevel@tonic-gate * Determine if physically contiguous pages exist for [vp, off] - [vp, off + 10597c478bd9Sstevel@tonic-gate * page_size(szc)) range. if they exist and ppa is not NULL fill ppa array 10607c478bd9Sstevel@tonic-gate * with these pages locked SHARED. If necessary reclaim pages from 10617c478bd9Sstevel@tonic-gate * freelist. Return 1 if contiguous pages exist and 0 otherwise. 10627c478bd9Sstevel@tonic-gate * 10637c478bd9Sstevel@tonic-gate * If we fail to lock pages still return 1 if pages exist and contiguous. 10647c478bd9Sstevel@tonic-gate * But in this case return value is just a hint. ppa array won't be filled. 10657c478bd9Sstevel@tonic-gate * Caller should initialize ppa[0] as NULL to distinguish return value. 10667c478bd9Sstevel@tonic-gate * 10677c478bd9Sstevel@tonic-gate * Returns 0 if pages don't exist or not physically contiguous. 10687c478bd9Sstevel@tonic-gate * 10697c478bd9Sstevel@tonic-gate * This routine doesn't work for anonymous(swapfs) pages. 10707c478bd9Sstevel@tonic-gate */ 10717c478bd9Sstevel@tonic-gate int 10727c478bd9Sstevel@tonic-gate page_exists_physcontig(vnode_t *vp, u_offset_t off, uint_t szc, page_t *ppa[]) 10737c478bd9Sstevel@tonic-gate { 10747c478bd9Sstevel@tonic-gate pgcnt_t pages; 10757c478bd9Sstevel@tonic-gate pfn_t pfn; 10767c478bd9Sstevel@tonic-gate page_t *rootpp; 10777c478bd9Sstevel@tonic-gate pgcnt_t i; 10787c478bd9Sstevel@tonic-gate pgcnt_t j; 10797c478bd9Sstevel@tonic-gate u_offset_t save_off = off; 10807c478bd9Sstevel@tonic-gate ulong_t index; 10817c478bd9Sstevel@tonic-gate kmutex_t *phm; 10827c478bd9Sstevel@tonic-gate page_t *pp; 10837c478bd9Sstevel@tonic-gate uint_t pszc; 10847c478bd9Sstevel@tonic-gate int loopcnt = 0; 10857c478bd9Sstevel@tonic-gate 10867c478bd9Sstevel@tonic-gate ASSERT(szc != 0); 10877c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 10887c478bd9Sstevel@tonic-gate ASSERT(!IS_SWAPFSVP(vp)); 1089ad23a2dbSjohansen ASSERT(!VN_ISKAS(vp)); 10907c478bd9Sstevel@tonic-gate 10917c478bd9Sstevel@tonic-gate again: 10927c478bd9Sstevel@tonic-gate if (++loopcnt > 3) { 10937c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[0]); 10947c478bd9Sstevel@tonic-gate return (0); 10957c478bd9Sstevel@tonic-gate } 10967c478bd9Sstevel@tonic-gate 10977c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 10987c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 10997c478bd9Sstevel@tonic-gate 11007c478bd9Sstevel@tonic-gate mutex_enter(phm); 1101e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 11027c478bd9Sstevel@tonic-gate mutex_exit(phm); 11037c478bd9Sstevel@tonic-gate 11047c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[1]); 11057c478bd9Sstevel@tonic-gate 11067c478bd9Sstevel@tonic-gate if (pp == NULL) { 11077c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[2]); 11087c478bd9Sstevel@tonic-gate return (0); 11097c478bd9Sstevel@tonic-gate } 11107c478bd9Sstevel@tonic-gate 11117c478bd9Sstevel@tonic-gate pages = page_get_pagecnt(szc); 11127c478bd9Sstevel@tonic-gate rootpp = pp; 11137c478bd9Sstevel@tonic-gate pfn = rootpp->p_pagenum; 11147c478bd9Sstevel@tonic-gate 11157c478bd9Sstevel@tonic-gate if ((pszc = pp->p_szc) >= szc && ppa != NULL) { 11167c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[3]); 11177c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_SHARED)) { 11187c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[4]); 11197c478bd9Sstevel@tonic-gate return (1); 11207c478bd9Sstevel@tonic-gate } 11219853d9e8SJason Beloro /* 11229853d9e8SJason Beloro * Also check whether p_pagenum was modified by DR. 11239853d9e8SJason Beloro */ 11247c478bd9Sstevel@tonic-gate if (pp->p_szc != pszc || pp->p_vnode != vp || 11259853d9e8SJason Beloro pp->p_offset != off || pp->p_pagenum != pfn) { 11267c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[5]); 11277c478bd9Sstevel@tonic-gate page_unlock(pp); 11287c478bd9Sstevel@tonic-gate off = save_off; 11297c478bd9Sstevel@tonic-gate goto again; 11307c478bd9Sstevel@tonic-gate } 11317c478bd9Sstevel@tonic-gate /* 11327c478bd9Sstevel@tonic-gate * szc was non zero and vnode and offset matched after we 11337c478bd9Sstevel@tonic-gate * locked the page it means it can't become free on us. 11347c478bd9Sstevel@tonic-gate */ 11357c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 11367c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, pages)) { 11377c478bd9Sstevel@tonic-gate page_unlock(pp); 11387c478bd9Sstevel@tonic-gate return (0); 11397c478bd9Sstevel@tonic-gate } 11407c478bd9Sstevel@tonic-gate ppa[0] = pp; 11417c478bd9Sstevel@tonic-gate pp++; 11427c478bd9Sstevel@tonic-gate off += PAGESIZE; 11437c478bd9Sstevel@tonic-gate pfn++; 11447c478bd9Sstevel@tonic-gate for (i = 1; i < pages; i++, pp++, off += PAGESIZE, pfn++) { 11457c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_SHARED)) { 11467c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[6]); 11477c478bd9Sstevel@tonic-gate pp--; 11487c478bd9Sstevel@tonic-gate while (i-- > 0) { 11497c478bd9Sstevel@tonic-gate page_unlock(pp); 11507c478bd9Sstevel@tonic-gate pp--; 11517c478bd9Sstevel@tonic-gate } 11527c478bd9Sstevel@tonic-gate ppa[0] = NULL; 11537c478bd9Sstevel@tonic-gate return (1); 11547c478bd9Sstevel@tonic-gate } 11557c478bd9Sstevel@tonic-gate if (pp->p_szc != pszc) { 11567c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[7]); 11577c478bd9Sstevel@tonic-gate page_unlock(pp); 11587c478bd9Sstevel@tonic-gate pp--; 11597c478bd9Sstevel@tonic-gate while (i-- > 0) { 11607c478bd9Sstevel@tonic-gate page_unlock(pp); 11617c478bd9Sstevel@tonic-gate pp--; 11627c478bd9Sstevel@tonic-gate } 11637c478bd9Sstevel@tonic-gate ppa[0] = NULL; 11647c478bd9Sstevel@tonic-gate off = save_off; 11657c478bd9Sstevel@tonic-gate goto again; 11667c478bd9Sstevel@tonic-gate } 11677c478bd9Sstevel@tonic-gate /* 11687c478bd9Sstevel@tonic-gate * szc the same as for previous already locked pages 11697c478bd9Sstevel@tonic-gate * with right identity. Since this page had correct 11707c478bd9Sstevel@tonic-gate * szc after we locked it can't get freed or destroyed 11717c478bd9Sstevel@tonic-gate * and therefore must have the expected identity. 11727c478bd9Sstevel@tonic-gate */ 11737c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 11747c478bd9Sstevel@tonic-gate if (pp->p_vnode != vp || 11757c478bd9Sstevel@tonic-gate pp->p_offset != off) { 11767c478bd9Sstevel@tonic-gate panic("page_exists_physcontig: " 11777c478bd9Sstevel@tonic-gate "large page identity doesn't match"); 11787c478bd9Sstevel@tonic-gate } 11797c478bd9Sstevel@tonic-gate ppa[i] = pp; 11807c478bd9Sstevel@tonic-gate ASSERT(pp->p_pagenum == pfn); 11817c478bd9Sstevel@tonic-gate } 11827c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[8]); 11837c478bd9Sstevel@tonic-gate ppa[pages] = NULL; 11847c478bd9Sstevel@tonic-gate return (1); 11857c478bd9Sstevel@tonic-gate } else if (pszc >= szc) { 11867c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[9]); 11877c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, pages)) { 11887c478bd9Sstevel@tonic-gate return (0); 11897c478bd9Sstevel@tonic-gate } 11907c478bd9Sstevel@tonic-gate return (1); 11917c478bd9Sstevel@tonic-gate } 11927c478bd9Sstevel@tonic-gate 11937c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, pages)) { 11947c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[10]); 11957c478bd9Sstevel@tonic-gate return (0); 11967c478bd9Sstevel@tonic-gate } 11977c478bd9Sstevel@tonic-gate 11987c478bd9Sstevel@tonic-gate if (page_numtomemseg_nolock(pfn) != 11997c478bd9Sstevel@tonic-gate page_numtomemseg_nolock(pfn + pages - 1)) { 12007c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[11]); 12017c478bd9Sstevel@tonic-gate return (0); 12027c478bd9Sstevel@tonic-gate } 12037c478bd9Sstevel@tonic-gate 12047c478bd9Sstevel@tonic-gate /* 12057c478bd9Sstevel@tonic-gate * We loop up 4 times across pages to promote page size. 12067c478bd9Sstevel@tonic-gate * We're extra cautious to promote page size atomically with respect 12077c478bd9Sstevel@tonic-gate * to everybody else. But we can probably optimize into 1 loop if 12087c478bd9Sstevel@tonic-gate * this becomes an issue. 12097c478bd9Sstevel@tonic-gate */ 12107c478bd9Sstevel@tonic-gate 12117c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++, off += PAGESIZE, pfn++) { 12127c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) { 12137c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[12]); 12147c478bd9Sstevel@tonic-gate break; 12157c478bd9Sstevel@tonic-gate } 12169853d9e8SJason Beloro /* 12179853d9e8SJason Beloro * Check whether p_pagenum was modified by DR. 12189853d9e8SJason Beloro */ 12199853d9e8SJason Beloro if (pp->p_pagenum != pfn) { 12209853d9e8SJason Beloro page_unlock(pp); 12219853d9e8SJason Beloro break; 12229853d9e8SJason Beloro } 12237c478bd9Sstevel@tonic-gate if (pp->p_vnode != vp || 12247c478bd9Sstevel@tonic-gate pp->p_offset != off) { 12257c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[13]); 12267c478bd9Sstevel@tonic-gate page_unlock(pp); 12277c478bd9Sstevel@tonic-gate break; 12287c478bd9Sstevel@tonic-gate } 12297c478bd9Sstevel@tonic-gate if (pp->p_szc >= szc) { 12307c478bd9Sstevel@tonic-gate ASSERT(i == 0); 12317c478bd9Sstevel@tonic-gate page_unlock(pp); 12327c478bd9Sstevel@tonic-gate off = save_off; 12337c478bd9Sstevel@tonic-gate goto again; 12347c478bd9Sstevel@tonic-gate } 12357c478bd9Sstevel@tonic-gate } 12367c478bd9Sstevel@tonic-gate 12377c478bd9Sstevel@tonic-gate if (i != pages) { 12387c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[14]); 12397c478bd9Sstevel@tonic-gate --pp; 12407c478bd9Sstevel@tonic-gate while (i-- > 0) { 12417c478bd9Sstevel@tonic-gate page_unlock(pp); 12427c478bd9Sstevel@tonic-gate --pp; 12437c478bd9Sstevel@tonic-gate } 12447c478bd9Sstevel@tonic-gate return (0); 12457c478bd9Sstevel@tonic-gate } 12467c478bd9Sstevel@tonic-gate 12477c478bd9Sstevel@tonic-gate pp = rootpp; 12487c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++) { 12497c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 12507c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[15]); 12517c478bd9Sstevel@tonic-gate ASSERT(!PP_ISAGED(pp)); 12527c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 12537c478bd9Sstevel@tonic-gate if (!page_reclaim(pp, NULL)) { 12547c478bd9Sstevel@tonic-gate break; 12557c478bd9Sstevel@tonic-gate } 12567c478bd9Sstevel@tonic-gate } else { 12577c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc < szc); 12587c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[16]); 12597c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 12607c478bd9Sstevel@tonic-gate } 12617c478bd9Sstevel@tonic-gate } 12627c478bd9Sstevel@tonic-gate if (i < pages) { 12637c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[17]); 12647c478bd9Sstevel@tonic-gate /* 12657c478bd9Sstevel@tonic-gate * page_reclaim failed because we were out of memory. 12667c478bd9Sstevel@tonic-gate * drop the rest of the locks and return because this page 12677c478bd9Sstevel@tonic-gate * must be already reallocated anyway. 12687c478bd9Sstevel@tonic-gate */ 12697c478bd9Sstevel@tonic-gate pp = rootpp; 12707c478bd9Sstevel@tonic-gate for (j = 0; j < pages; j++, pp++) { 12717c478bd9Sstevel@tonic-gate if (j != i) { 12727c478bd9Sstevel@tonic-gate page_unlock(pp); 12737c478bd9Sstevel@tonic-gate } 12747c478bd9Sstevel@tonic-gate } 12757c478bd9Sstevel@tonic-gate return (0); 12767c478bd9Sstevel@tonic-gate } 12777c478bd9Sstevel@tonic-gate 12787c478bd9Sstevel@tonic-gate off = save_off; 12797c478bd9Sstevel@tonic-gate pp = rootpp; 12807c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++, off += PAGESIZE) { 12817c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 12827c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 12837c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 12847c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == vp); 12857c478bd9Sstevel@tonic-gate ASSERT(pp->p_offset == off); 12867c478bd9Sstevel@tonic-gate pp->p_szc = szc; 12877c478bd9Sstevel@tonic-gate } 12887c478bd9Sstevel@tonic-gate pp = rootpp; 12897c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++) { 12907c478bd9Sstevel@tonic-gate if (ppa == NULL) { 12917c478bd9Sstevel@tonic-gate page_unlock(pp); 12927c478bd9Sstevel@tonic-gate } else { 12937c478bd9Sstevel@tonic-gate ppa[i] = pp; 12947c478bd9Sstevel@tonic-gate page_downgrade(ppa[i]); 12957c478bd9Sstevel@tonic-gate } 12967c478bd9Sstevel@tonic-gate } 12977c478bd9Sstevel@tonic-gate if (ppa != NULL) { 12987c478bd9Sstevel@tonic-gate ppa[pages] = NULL; 12997c478bd9Sstevel@tonic-gate } 13007c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[18]); 13017c478bd9Sstevel@tonic-gate ASSERT(vp->v_pages != NULL); 13027c478bd9Sstevel@tonic-gate return (1); 13037c478bd9Sstevel@tonic-gate } 13047c478bd9Sstevel@tonic-gate 13057c478bd9Sstevel@tonic-gate /* 13067c478bd9Sstevel@tonic-gate * Determine whether a page with the specified [vp, off] 13077c478bd9Sstevel@tonic-gate * currently exists in the system and if so return its 13087c478bd9Sstevel@tonic-gate * size code. Obviously this should only be considered as 13097c478bd9Sstevel@tonic-gate * a hint since nothing prevents the page from disappearing 13107c478bd9Sstevel@tonic-gate * or appearing immediately after the return from this routine. 13117c478bd9Sstevel@tonic-gate */ 13127c478bd9Sstevel@tonic-gate int 13137c478bd9Sstevel@tonic-gate page_exists_forreal(vnode_t *vp, u_offset_t off, uint_t *szc) 13147c478bd9Sstevel@tonic-gate { 13157c478bd9Sstevel@tonic-gate page_t *pp; 13167c478bd9Sstevel@tonic-gate kmutex_t *phm; 13177c478bd9Sstevel@tonic-gate ulong_t index; 13187c478bd9Sstevel@tonic-gate int rc = 0; 13197c478bd9Sstevel@tonic-gate 13207c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 13217c478bd9Sstevel@tonic-gate ASSERT(szc != NULL); 13227c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exists_forreal_cnt); 13237c478bd9Sstevel@tonic-gate 13247c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 13257c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 13267c478bd9Sstevel@tonic-gate 13277c478bd9Sstevel@tonic-gate mutex_enter(phm); 1328e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 13297c478bd9Sstevel@tonic-gate if (pp != NULL) { 13307c478bd9Sstevel@tonic-gate *szc = pp->p_szc; 13317c478bd9Sstevel@tonic-gate rc = 1; 13327c478bd9Sstevel@tonic-gate } 13337c478bd9Sstevel@tonic-gate mutex_exit(phm); 13347c478bd9Sstevel@tonic-gate return (rc); 13357c478bd9Sstevel@tonic-gate } 13367c478bd9Sstevel@tonic-gate 13377c478bd9Sstevel@tonic-gate /* wakeup threads waiting for pages in page_create_get_something() */ 13387c478bd9Sstevel@tonic-gate void 13397c478bd9Sstevel@tonic-gate wakeup_pcgs(void) 13407c478bd9Sstevel@tonic-gate { 13417c478bd9Sstevel@tonic-gate if (!CV_HAS_WAITERS(&pcgs_cv)) 13427c478bd9Sstevel@tonic-gate return; 13437c478bd9Sstevel@tonic-gate cv_broadcast(&pcgs_cv); 13447c478bd9Sstevel@tonic-gate } 13457c478bd9Sstevel@tonic-gate 13467c478bd9Sstevel@tonic-gate /* 13477c478bd9Sstevel@tonic-gate * 'freemem' is used all over the kernel as an indication of how many 13487c478bd9Sstevel@tonic-gate * pages are free (either on the cache list or on the free page list) 13497c478bd9Sstevel@tonic-gate * in the system. In very few places is a really accurate 'freemem' 13507c478bd9Sstevel@tonic-gate * needed. To avoid contention of the lock protecting a the 13517c478bd9Sstevel@tonic-gate * single freemem, it was spread out into NCPU buckets. Set_freemem 13527c478bd9Sstevel@tonic-gate * sets freemem to the total of all NCPU buckets. It is called from 13537c478bd9Sstevel@tonic-gate * clock() on each TICK. 13547c478bd9Sstevel@tonic-gate */ 13557c478bd9Sstevel@tonic-gate void 13567c478bd9Sstevel@tonic-gate set_freemem() 13577c478bd9Sstevel@tonic-gate { 13587c478bd9Sstevel@tonic-gate struct pcf *p; 13597c478bd9Sstevel@tonic-gate ulong_t t; 13607c478bd9Sstevel@tonic-gate uint_t i; 13617c478bd9Sstevel@tonic-gate 13627c478bd9Sstevel@tonic-gate t = 0; 13637c478bd9Sstevel@tonic-gate p = pcf; 136406fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 13657c478bd9Sstevel@tonic-gate t += p->pcf_count; 13667c478bd9Sstevel@tonic-gate p++; 13677c478bd9Sstevel@tonic-gate } 13687c478bd9Sstevel@tonic-gate freemem = t; 13697c478bd9Sstevel@tonic-gate 13707c478bd9Sstevel@tonic-gate /* 13717c478bd9Sstevel@tonic-gate * Don't worry about grabbing mutex. It's not that 13727c478bd9Sstevel@tonic-gate * critical if we miss a tick or two. This is 13737c478bd9Sstevel@tonic-gate * where we wakeup possible delayers in 13747c478bd9Sstevel@tonic-gate * page_create_get_something(). 13757c478bd9Sstevel@tonic-gate */ 13767c478bd9Sstevel@tonic-gate wakeup_pcgs(); 13777c478bd9Sstevel@tonic-gate } 13787c478bd9Sstevel@tonic-gate 13797c478bd9Sstevel@tonic-gate ulong_t 13807c478bd9Sstevel@tonic-gate get_freemem() 13817c478bd9Sstevel@tonic-gate { 13827c478bd9Sstevel@tonic-gate struct pcf *p; 13837c478bd9Sstevel@tonic-gate ulong_t t; 13847c478bd9Sstevel@tonic-gate uint_t i; 13857c478bd9Sstevel@tonic-gate 13867c478bd9Sstevel@tonic-gate t = 0; 13877c478bd9Sstevel@tonic-gate p = pcf; 138806fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 13897c478bd9Sstevel@tonic-gate t += p->pcf_count; 13907c478bd9Sstevel@tonic-gate p++; 13917c478bd9Sstevel@tonic-gate } 13927c478bd9Sstevel@tonic-gate /* 13937c478bd9Sstevel@tonic-gate * We just calculated it, might as well set it. 13947c478bd9Sstevel@tonic-gate */ 13957c478bd9Sstevel@tonic-gate freemem = t; 13967c478bd9Sstevel@tonic-gate return (t); 13977c478bd9Sstevel@tonic-gate } 13987c478bd9Sstevel@tonic-gate 13997c478bd9Sstevel@tonic-gate /* 14007c478bd9Sstevel@tonic-gate * Acquire all of the page cache & free (pcf) locks. 14017c478bd9Sstevel@tonic-gate */ 14027c478bd9Sstevel@tonic-gate void 14037c478bd9Sstevel@tonic-gate pcf_acquire_all() 14047c478bd9Sstevel@tonic-gate { 14057c478bd9Sstevel@tonic-gate struct pcf *p; 14067c478bd9Sstevel@tonic-gate uint_t i; 14077c478bd9Sstevel@tonic-gate 14087c478bd9Sstevel@tonic-gate p = pcf; 140906fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 14107c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 14117c478bd9Sstevel@tonic-gate p++; 14127c478bd9Sstevel@tonic-gate } 14137c478bd9Sstevel@tonic-gate } 14147c478bd9Sstevel@tonic-gate 14157c478bd9Sstevel@tonic-gate /* 14167c478bd9Sstevel@tonic-gate * Release all the pcf_locks. 14177c478bd9Sstevel@tonic-gate */ 14187c478bd9Sstevel@tonic-gate void 14197c478bd9Sstevel@tonic-gate pcf_release_all() 14207c478bd9Sstevel@tonic-gate { 14217c478bd9Sstevel@tonic-gate struct pcf *p; 14227c478bd9Sstevel@tonic-gate uint_t i; 14237c478bd9Sstevel@tonic-gate 14247c478bd9Sstevel@tonic-gate p = pcf; 142506fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 14267c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 14277c478bd9Sstevel@tonic-gate p++; 14287c478bd9Sstevel@tonic-gate } 14297c478bd9Sstevel@tonic-gate } 14307c478bd9Sstevel@tonic-gate 14317c478bd9Sstevel@tonic-gate /* 14327c478bd9Sstevel@tonic-gate * Inform the VM system that we need some pages freed up. 14337c478bd9Sstevel@tonic-gate * Calls must be symmetric, e.g.: 14347c478bd9Sstevel@tonic-gate * 14357c478bd9Sstevel@tonic-gate * page_needfree(100); 14367c478bd9Sstevel@tonic-gate * wait a bit; 14377c478bd9Sstevel@tonic-gate * page_needfree(-100); 14387c478bd9Sstevel@tonic-gate */ 14397c478bd9Sstevel@tonic-gate void 14407c478bd9Sstevel@tonic-gate page_needfree(spgcnt_t npages) 14417c478bd9Sstevel@tonic-gate { 14427c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 14437c478bd9Sstevel@tonic-gate needfree += npages; 14447c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 14457c478bd9Sstevel@tonic-gate } 14467c478bd9Sstevel@tonic-gate 14477c478bd9Sstevel@tonic-gate /* 14487c478bd9Sstevel@tonic-gate * Throttle for page_create(): try to prevent freemem from dropping 14497c478bd9Sstevel@tonic-gate * below throttlefree. We can't provide a 100% guarantee because 14507c478bd9Sstevel@tonic-gate * KM_NOSLEEP allocations, page_reclaim(), and various other things 14517c478bd9Sstevel@tonic-gate * nibble away at the freelist. However, we can block all PG_WAIT 14527c478bd9Sstevel@tonic-gate * allocations until memory becomes available. The motivation is 14537c478bd9Sstevel@tonic-gate * that several things can fall apart when there's no free memory: 14547c478bd9Sstevel@tonic-gate * 14557c478bd9Sstevel@tonic-gate * (1) If pageout() needs memory to push a page, the system deadlocks. 14567c478bd9Sstevel@tonic-gate * 14577c478bd9Sstevel@tonic-gate * (2) By (broken) specification, timeout(9F) can neither fail nor 14587c478bd9Sstevel@tonic-gate * block, so it has no choice but to panic the system if it 14597c478bd9Sstevel@tonic-gate * cannot allocate a callout structure. 14607c478bd9Sstevel@tonic-gate * 14617c478bd9Sstevel@tonic-gate * (3) Like timeout(), ddi_set_callback() cannot fail and cannot block; 14627c478bd9Sstevel@tonic-gate * it panics if it cannot allocate a callback structure. 14637c478bd9Sstevel@tonic-gate * 14647c478bd9Sstevel@tonic-gate * (4) Untold numbers of third-party drivers have not yet been hardened 14657c478bd9Sstevel@tonic-gate * against KM_NOSLEEP and/or allocb() failures; they simply assume 14667c478bd9Sstevel@tonic-gate * success and panic the system with a data fault on failure. 14677c478bd9Sstevel@tonic-gate * (The long-term solution to this particular problem is to ship 14687c478bd9Sstevel@tonic-gate * hostile fault-injecting DEBUG kernels with the DDK.) 14697c478bd9Sstevel@tonic-gate * 14707c478bd9Sstevel@tonic-gate * It is theoretically impossible to guarantee success of non-blocking 14717c478bd9Sstevel@tonic-gate * allocations, but in practice, this throttle is very hard to break. 14727c478bd9Sstevel@tonic-gate */ 14737c478bd9Sstevel@tonic-gate static int 14747c478bd9Sstevel@tonic-gate page_create_throttle(pgcnt_t npages, int flags) 14757c478bd9Sstevel@tonic-gate { 14767c478bd9Sstevel@tonic-gate ulong_t fm; 14777c478bd9Sstevel@tonic-gate uint_t i; 14787c478bd9Sstevel@tonic-gate pgcnt_t tf; /* effective value of throttlefree */ 14797c478bd9Sstevel@tonic-gate 148023a80de1SStan Studzinski /* 148123a80de1SStan Studzinski * Normal priority allocations. 148223a80de1SStan Studzinski */ 148323a80de1SStan Studzinski if ((flags & (PG_WAIT | PG_NORMALPRI)) == PG_NORMALPRI) { 148423a80de1SStan Studzinski ASSERT(!(flags & (PG_PANIC | PG_PUSHPAGE))); 148523a80de1SStan Studzinski return (freemem >= npages + throttlefree); 148623a80de1SStan Studzinski } 148723a80de1SStan Studzinski 14887c478bd9Sstevel@tonic-gate /* 14897c478bd9Sstevel@tonic-gate * Never deny pages when: 14907c478bd9Sstevel@tonic-gate * - it's a thread that cannot block [NOMEMWAIT()] 14917c478bd9Sstevel@tonic-gate * - the allocation cannot block and must not fail 14927c478bd9Sstevel@tonic-gate * - the allocation cannot block and is pageout dispensated 14937c478bd9Sstevel@tonic-gate */ 14947c478bd9Sstevel@tonic-gate if (NOMEMWAIT() || 14957c478bd9Sstevel@tonic-gate ((flags & (PG_WAIT | PG_PANIC)) == PG_PANIC) || 14967c478bd9Sstevel@tonic-gate ((flags & (PG_WAIT | PG_PUSHPAGE)) == PG_PUSHPAGE)) 14977c478bd9Sstevel@tonic-gate return (1); 14987c478bd9Sstevel@tonic-gate 14997c478bd9Sstevel@tonic-gate /* 15007c478bd9Sstevel@tonic-gate * If the allocation can't block, we look favorably upon it 15017c478bd9Sstevel@tonic-gate * unless we're below pageout_reserve. In that case we fail 15027c478bd9Sstevel@tonic-gate * the allocation because we want to make sure there are a few 15037c478bd9Sstevel@tonic-gate * pages available for pageout. 15047c478bd9Sstevel@tonic-gate */ 15057c478bd9Sstevel@tonic-gate if ((flags & PG_WAIT) == 0) 15067c478bd9Sstevel@tonic-gate return (freemem >= npages + pageout_reserve); 15077c478bd9Sstevel@tonic-gate 15087c478bd9Sstevel@tonic-gate /* Calculate the effective throttlefree value */ 15097c478bd9Sstevel@tonic-gate tf = throttlefree - 15107c478bd9Sstevel@tonic-gate ((flags & PG_PUSHPAGE) ? pageout_reserve : 0); 15117c478bd9Sstevel@tonic-gate 15127c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 15137c478bd9Sstevel@tonic-gate 151478b03d3aSkchow for (;;) { 151578b03d3aSkchow fm = 0; 15167c478bd9Sstevel@tonic-gate pcf_acquire_all(); 15177c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 151806fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 15197c478bd9Sstevel@tonic-gate fm += pcf[i].pcf_count; 15207c478bd9Sstevel@tonic-gate pcf[i].pcf_wait++; 15217c478bd9Sstevel@tonic-gate mutex_exit(&pcf[i].pcf_lock); 15227c478bd9Sstevel@tonic-gate } 15237c478bd9Sstevel@tonic-gate freemem = fm; 152478b03d3aSkchow if (freemem >= npages + tf) { 152578b03d3aSkchow mutex_exit(&new_freemem_lock); 152678b03d3aSkchow break; 152778b03d3aSkchow } 15287c478bd9Sstevel@tonic-gate needfree += npages; 15297c478bd9Sstevel@tonic-gate freemem_wait++; 15307c478bd9Sstevel@tonic-gate cv_wait(&freemem_cv, &new_freemem_lock); 15317c478bd9Sstevel@tonic-gate freemem_wait--; 15327c478bd9Sstevel@tonic-gate needfree -= npages; 15337c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 15347c478bd9Sstevel@tonic-gate } 15357c478bd9Sstevel@tonic-gate return (1); 15367c478bd9Sstevel@tonic-gate } 15377c478bd9Sstevel@tonic-gate 15387c478bd9Sstevel@tonic-gate /* 1539da6c28aaSamw * page_create_wait() is called to either coalesce pages from the 15407c478bd9Sstevel@tonic-gate * different pcf buckets or to wait because there simply are not 15417c478bd9Sstevel@tonic-gate * enough pages to satisfy the caller's request. 15427c478bd9Sstevel@tonic-gate * 15437c478bd9Sstevel@tonic-gate * Sadly, this is called from platform/vm/vm_machdep.c 15447c478bd9Sstevel@tonic-gate */ 15457c478bd9Sstevel@tonic-gate int 154606fb6a36Sdv page_create_wait(pgcnt_t npages, uint_t flags) 15477c478bd9Sstevel@tonic-gate { 15487c478bd9Sstevel@tonic-gate pgcnt_t total; 15497c478bd9Sstevel@tonic-gate uint_t i; 15507c478bd9Sstevel@tonic-gate struct pcf *p; 15517c478bd9Sstevel@tonic-gate 15527c478bd9Sstevel@tonic-gate /* 15537c478bd9Sstevel@tonic-gate * Wait until there are enough free pages to satisfy our 15547c478bd9Sstevel@tonic-gate * entire request. 15557c478bd9Sstevel@tonic-gate * We set needfree += npages before prodding pageout, to make sure 15567c478bd9Sstevel@tonic-gate * it does real work when npages > lotsfree > freemem. 15577c478bd9Sstevel@tonic-gate */ 15587c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_not_enough); 15597c478bd9Sstevel@tonic-gate 15607c478bd9Sstevel@tonic-gate ASSERT(!kcage_on ? !(flags & PG_NORELOC) : 1); 15617c478bd9Sstevel@tonic-gate checkagain: 1562d94ffb28Sjmcp if ((flags & PG_NORELOC) && 1563d94ffb28Sjmcp kcage_freemem < kcage_throttlefree + npages) 1564d94ffb28Sjmcp (void) kcage_create_throttle(npages, flags); 15657c478bd9Sstevel@tonic-gate 15667c478bd9Sstevel@tonic-gate if (freemem < npages + throttlefree) 15677c478bd9Sstevel@tonic-gate if (!page_create_throttle(npages, flags)) 15687c478bd9Sstevel@tonic-gate return (0); 15697c478bd9Sstevel@tonic-gate 157006fb6a36Sdv if (pcf_decrement_bucket(npages) || 157106fb6a36Sdv pcf_decrement_multiple(&total, npages, 0)) 157206fb6a36Sdv return (1); 15737c478bd9Sstevel@tonic-gate 15747c478bd9Sstevel@tonic-gate /* 15757c478bd9Sstevel@tonic-gate * All of the pcf locks are held, there are not enough pages 15767c478bd9Sstevel@tonic-gate * to satisfy the request (npages < total). 15777c478bd9Sstevel@tonic-gate * Be sure to acquire the new_freemem_lock before dropping 15787c478bd9Sstevel@tonic-gate * the pcf locks. This prevents dropping wakeups in page_free(). 15797c478bd9Sstevel@tonic-gate * The order is always pcf_lock then new_freemem_lock. 15807c478bd9Sstevel@tonic-gate * 15817c478bd9Sstevel@tonic-gate * Since we hold all the pcf locks, it is a good time to set freemem. 15827c478bd9Sstevel@tonic-gate * 15837c478bd9Sstevel@tonic-gate * If the caller does not want to wait, return now. 15847c478bd9Sstevel@tonic-gate * Else turn the pageout daemon loose to find something 15857c478bd9Sstevel@tonic-gate * and wait till it does. 15867c478bd9Sstevel@tonic-gate * 15877c478bd9Sstevel@tonic-gate */ 15887c478bd9Sstevel@tonic-gate freemem = total; 15897c478bd9Sstevel@tonic-gate 15907c478bd9Sstevel@tonic-gate if ((flags & PG_WAIT) == 0) { 15917c478bd9Sstevel@tonic-gate pcf_release_all(); 15927c478bd9Sstevel@tonic-gate 15937c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_NOMEM, 15947c478bd9Sstevel@tonic-gate "page_create_nomem:npages %ld freemem %ld", npages, freemem); 15957c478bd9Sstevel@tonic-gate return (0); 15967c478bd9Sstevel@tonic-gate } 15977c478bd9Sstevel@tonic-gate 15987c478bd9Sstevel@tonic-gate ASSERT(proc_pageout != NULL); 15997c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 16007c478bd9Sstevel@tonic-gate 16017c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SLEEP_START, 16027c478bd9Sstevel@tonic-gate "page_create_sleep_start: freemem %ld needfree %ld", 16037c478bd9Sstevel@tonic-gate freemem, needfree); 16047c478bd9Sstevel@tonic-gate 16057c478bd9Sstevel@tonic-gate /* 16067c478bd9Sstevel@tonic-gate * We are going to wait. 16077c478bd9Sstevel@tonic-gate * We currently hold all of the pcf_locks, 16087c478bd9Sstevel@tonic-gate * get the new_freemem_lock (it protects freemem_wait), 16097c478bd9Sstevel@tonic-gate * before dropping the pcf_locks. 16107c478bd9Sstevel@tonic-gate */ 16117c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 16127c478bd9Sstevel@tonic-gate 16137c478bd9Sstevel@tonic-gate p = pcf; 161406fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 16157c478bd9Sstevel@tonic-gate p->pcf_wait++; 16167c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 16177c478bd9Sstevel@tonic-gate p++; 16187c478bd9Sstevel@tonic-gate } 16197c478bd9Sstevel@tonic-gate 16207c478bd9Sstevel@tonic-gate needfree += npages; 16217c478bd9Sstevel@tonic-gate freemem_wait++; 16227c478bd9Sstevel@tonic-gate 16237c478bd9Sstevel@tonic-gate cv_wait(&freemem_cv, &new_freemem_lock); 16247c478bd9Sstevel@tonic-gate 16257c478bd9Sstevel@tonic-gate freemem_wait--; 16267c478bd9Sstevel@tonic-gate needfree -= npages; 16277c478bd9Sstevel@tonic-gate 16287c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 16297c478bd9Sstevel@tonic-gate 16307c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SLEEP_END, 16317c478bd9Sstevel@tonic-gate "page_create_sleep_end: freemem %ld needfree %ld", 16327c478bd9Sstevel@tonic-gate freemem, needfree); 16337c478bd9Sstevel@tonic-gate 16347c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_not_enough_again); 16357c478bd9Sstevel@tonic-gate goto checkagain; 16367c478bd9Sstevel@tonic-gate } 16377c478bd9Sstevel@tonic-gate /* 16387c478bd9Sstevel@tonic-gate * A routine to do the opposite of page_create_wait(). 16397c478bd9Sstevel@tonic-gate */ 16407c478bd9Sstevel@tonic-gate void 16417c478bd9Sstevel@tonic-gate page_create_putback(spgcnt_t npages) 16427c478bd9Sstevel@tonic-gate { 16437c478bd9Sstevel@tonic-gate struct pcf *p; 16447c478bd9Sstevel@tonic-gate pgcnt_t lump; 16457c478bd9Sstevel@tonic-gate uint_t *which; 16467c478bd9Sstevel@tonic-gate 16477c478bd9Sstevel@tonic-gate /* 16487c478bd9Sstevel@tonic-gate * When a contiguous lump is broken up, we have to 16497c478bd9Sstevel@tonic-gate * deal with lots of pages (min 64) so lets spread 16507c478bd9Sstevel@tonic-gate * the wealth around. 16517c478bd9Sstevel@tonic-gate */ 165206fb6a36Sdv lump = roundup(npages, pcf_fanout) / pcf_fanout; 16537c478bd9Sstevel@tonic-gate freemem += npages; 16547c478bd9Sstevel@tonic-gate 165506fb6a36Sdv for (p = pcf; (npages > 0) && (p < &pcf[pcf_fanout]); p++) { 16567c478bd9Sstevel@tonic-gate which = &p->pcf_count; 16577c478bd9Sstevel@tonic-gate 16587c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 16597c478bd9Sstevel@tonic-gate 16607c478bd9Sstevel@tonic-gate if (p->pcf_block) { 16617c478bd9Sstevel@tonic-gate which = &p->pcf_reserve; 16627c478bd9Sstevel@tonic-gate } 16637c478bd9Sstevel@tonic-gate 16647c478bd9Sstevel@tonic-gate if (lump < npages) { 16657c478bd9Sstevel@tonic-gate *which += (uint_t)lump; 16667c478bd9Sstevel@tonic-gate npages -= lump; 16677c478bd9Sstevel@tonic-gate } else { 16687c478bd9Sstevel@tonic-gate *which += (uint_t)npages; 16697c478bd9Sstevel@tonic-gate npages = 0; 16707c478bd9Sstevel@tonic-gate } 16717c478bd9Sstevel@tonic-gate 16727c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 16737c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 16747c478bd9Sstevel@tonic-gate /* 16757c478bd9Sstevel@tonic-gate * Check to see if some other thread 16767c478bd9Sstevel@tonic-gate * is actually waiting. Another bucket 16777c478bd9Sstevel@tonic-gate * may have woken it up by now. If there 16787c478bd9Sstevel@tonic-gate * are no waiters, then set our pcf_wait 16797c478bd9Sstevel@tonic-gate * count to zero to avoid coming in here 16807c478bd9Sstevel@tonic-gate * next time. 16817c478bd9Sstevel@tonic-gate */ 16827c478bd9Sstevel@tonic-gate if (freemem_wait) { 16837c478bd9Sstevel@tonic-gate if (npages > 1) { 16847c478bd9Sstevel@tonic-gate cv_broadcast(&freemem_cv); 16857c478bd9Sstevel@tonic-gate } else { 16867c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 16877c478bd9Sstevel@tonic-gate } 16887c478bd9Sstevel@tonic-gate p->pcf_wait--; 16897c478bd9Sstevel@tonic-gate } else { 16907c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 16917c478bd9Sstevel@tonic-gate } 16927c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 16937c478bd9Sstevel@tonic-gate } 16947c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 16957c478bd9Sstevel@tonic-gate } 16967c478bd9Sstevel@tonic-gate ASSERT(npages == 0); 16977c478bd9Sstevel@tonic-gate } 16987c478bd9Sstevel@tonic-gate 16997c478bd9Sstevel@tonic-gate /* 17007c478bd9Sstevel@tonic-gate * A helper routine for page_create_get_something. 17017c478bd9Sstevel@tonic-gate * The indenting got to deep down there. 17027c478bd9Sstevel@tonic-gate * Unblock the pcf counters. Any pages freed after 17037c478bd9Sstevel@tonic-gate * pcf_block got set are moved to pcf_count and 17047c478bd9Sstevel@tonic-gate * wakeups (cv_broadcast() or cv_signal()) are done as needed. 17057c478bd9Sstevel@tonic-gate */ 17067c478bd9Sstevel@tonic-gate static void 17077c478bd9Sstevel@tonic-gate pcgs_unblock(void) 17087c478bd9Sstevel@tonic-gate { 17097c478bd9Sstevel@tonic-gate int i; 17107c478bd9Sstevel@tonic-gate struct pcf *p; 17117c478bd9Sstevel@tonic-gate 17127c478bd9Sstevel@tonic-gate /* Update freemem while we're here. */ 17137c478bd9Sstevel@tonic-gate freemem = 0; 17147c478bd9Sstevel@tonic-gate p = pcf; 171506fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 17167c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 17177c478bd9Sstevel@tonic-gate ASSERT(p->pcf_count == 0); 17187c478bd9Sstevel@tonic-gate p->pcf_count = p->pcf_reserve; 17197c478bd9Sstevel@tonic-gate p->pcf_block = 0; 17207c478bd9Sstevel@tonic-gate freemem += p->pcf_count; 17217c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 17227c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 17237c478bd9Sstevel@tonic-gate if (freemem_wait) { 17247c478bd9Sstevel@tonic-gate if (p->pcf_reserve > 1) { 17257c478bd9Sstevel@tonic-gate cv_broadcast(&freemem_cv); 17267c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 17277c478bd9Sstevel@tonic-gate } else { 17287c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 17297c478bd9Sstevel@tonic-gate p->pcf_wait--; 17307c478bd9Sstevel@tonic-gate } 17317c478bd9Sstevel@tonic-gate } else { 17327c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 17337c478bd9Sstevel@tonic-gate } 17347c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 17357c478bd9Sstevel@tonic-gate } 17367c478bd9Sstevel@tonic-gate p->pcf_reserve = 0; 17377c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 17387c478bd9Sstevel@tonic-gate p++; 17397c478bd9Sstevel@tonic-gate } 17407c478bd9Sstevel@tonic-gate } 17417c478bd9Sstevel@tonic-gate 17427c478bd9Sstevel@tonic-gate /* 17437c478bd9Sstevel@tonic-gate * Called from page_create_va() when both the cache and free lists 17447c478bd9Sstevel@tonic-gate * have been checked once. 17457c478bd9Sstevel@tonic-gate * 17467c478bd9Sstevel@tonic-gate * Either returns a page or panics since the accounting was done 17477c478bd9Sstevel@tonic-gate * way before we got here. 17487c478bd9Sstevel@tonic-gate * 17497c478bd9Sstevel@tonic-gate * We don't come here often, so leave the accounting on permanently. 17507c478bd9Sstevel@tonic-gate */ 17517c478bd9Sstevel@tonic-gate 17527c478bd9Sstevel@tonic-gate #define MAX_PCGS 100 17537c478bd9Sstevel@tonic-gate 17547c478bd9Sstevel@tonic-gate #ifdef DEBUG 17557c478bd9Sstevel@tonic-gate #define PCGS_TRIES 100 17567c478bd9Sstevel@tonic-gate #else /* DEBUG */ 17577c478bd9Sstevel@tonic-gate #define PCGS_TRIES 10 17587c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 17597c478bd9Sstevel@tonic-gate 17607c478bd9Sstevel@tonic-gate #ifdef VM_STATS 17617c478bd9Sstevel@tonic-gate uint_t pcgs_counts[PCGS_TRIES]; 17627c478bd9Sstevel@tonic-gate uint_t pcgs_too_many; 17637c478bd9Sstevel@tonic-gate uint_t pcgs_entered; 17647c478bd9Sstevel@tonic-gate uint_t pcgs_entered_noreloc; 17657c478bd9Sstevel@tonic-gate uint_t pcgs_locked; 17667c478bd9Sstevel@tonic-gate uint_t pcgs_cagelocked; 17677c478bd9Sstevel@tonic-gate #endif /* VM_STATS */ 17687c478bd9Sstevel@tonic-gate 17697c478bd9Sstevel@tonic-gate static page_t * 17707c478bd9Sstevel@tonic-gate page_create_get_something(vnode_t *vp, u_offset_t off, struct seg *seg, 17717c478bd9Sstevel@tonic-gate caddr_t vaddr, uint_t flags) 17727c478bd9Sstevel@tonic-gate { 17737c478bd9Sstevel@tonic-gate uint_t count; 17747c478bd9Sstevel@tonic-gate page_t *pp; 17757c478bd9Sstevel@tonic-gate uint_t locked, i; 17767c478bd9Sstevel@tonic-gate struct pcf *p; 17777c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 17787c478bd9Sstevel@tonic-gate int cagelocked = 0; 17797c478bd9Sstevel@tonic-gate 17807c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_entered); 17817c478bd9Sstevel@tonic-gate 17827c478bd9Sstevel@tonic-gate /* 17837c478bd9Sstevel@tonic-gate * Tap any reserve freelists: if we fail now, we'll die 17847c478bd9Sstevel@tonic-gate * since the page(s) we're looking for have already been 17857c478bd9Sstevel@tonic-gate * accounted for. 17867c478bd9Sstevel@tonic-gate */ 17877c478bd9Sstevel@tonic-gate flags |= PG_PANIC; 17887c478bd9Sstevel@tonic-gate 1789d94ffb28Sjmcp if ((flags & PG_NORELOC) != 0) { 17907c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_entered_noreloc); 17917c478bd9Sstevel@tonic-gate /* 17927c478bd9Sstevel@tonic-gate * Requests for free pages from critical threads 17937c478bd9Sstevel@tonic-gate * such as pageout still won't throttle here, but 17947c478bd9Sstevel@tonic-gate * we must try again, to give the cageout thread 17957c478bd9Sstevel@tonic-gate * another chance to catch up. Since we already 17967c478bd9Sstevel@tonic-gate * accounted for the pages, we had better get them 17977c478bd9Sstevel@tonic-gate * this time. 17987c478bd9Sstevel@tonic-gate * 17997c478bd9Sstevel@tonic-gate * N.B. All non-critical threads acquire the pcgs_cagelock 18007c478bd9Sstevel@tonic-gate * to serialize access to the freelists. This implements a 18017c478bd9Sstevel@tonic-gate * turnstile-type synchornization to avoid starvation of 18027c478bd9Sstevel@tonic-gate * critical requests for PG_NORELOC memory by non-critical 18037c478bd9Sstevel@tonic-gate * threads: all non-critical threads must acquire a 'ticket' 18047c478bd9Sstevel@tonic-gate * before passing through, which entails making sure 18057c478bd9Sstevel@tonic-gate * kcage_freemem won't fall below minfree prior to grabbing 18067c478bd9Sstevel@tonic-gate * pages from the freelists. 18077c478bd9Sstevel@tonic-gate */ 1808d94ffb28Sjmcp if (kcage_create_throttle(1, flags) == KCT_NONCRIT) { 18097c478bd9Sstevel@tonic-gate mutex_enter(&pcgs_cagelock); 18107c478bd9Sstevel@tonic-gate cagelocked = 1; 18117c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_cagelocked); 18127c478bd9Sstevel@tonic-gate } 18137c478bd9Sstevel@tonic-gate } 18147c478bd9Sstevel@tonic-gate 18157c478bd9Sstevel@tonic-gate /* 18167c478bd9Sstevel@tonic-gate * Time to get serious. 18177c478bd9Sstevel@tonic-gate * We failed to get a `correctly colored' page from both the 18187c478bd9Sstevel@tonic-gate * free and cache lists. 18197c478bd9Sstevel@tonic-gate * We escalate in stage. 18207c478bd9Sstevel@tonic-gate * 18217c478bd9Sstevel@tonic-gate * First try both lists without worring about color. 18227c478bd9Sstevel@tonic-gate * 18237c478bd9Sstevel@tonic-gate * Then, grab all page accounting locks (ie. pcf[]) and 18247c478bd9Sstevel@tonic-gate * steal any pages that they have and set the pcf_block flag to 18257c478bd9Sstevel@tonic-gate * stop deletions from the lists. This will help because 18267c478bd9Sstevel@tonic-gate * a page can get added to the free list while we are looking 18277c478bd9Sstevel@tonic-gate * at the cache list, then another page could be added to the cache 18287c478bd9Sstevel@tonic-gate * list allowing the page on the free list to be removed as we 18297c478bd9Sstevel@tonic-gate * move from looking at the cache list to the free list. This 18307c478bd9Sstevel@tonic-gate * could happen over and over. We would never find the page 18317c478bd9Sstevel@tonic-gate * we have accounted for. 18327c478bd9Sstevel@tonic-gate * 18337c478bd9Sstevel@tonic-gate * Noreloc pages are a subset of the global (relocatable) page pool. 18347c478bd9Sstevel@tonic-gate * They are not tracked separately in the pcf bins, so it is 18357c478bd9Sstevel@tonic-gate * impossible to know when doing pcf accounting if the available 18367c478bd9Sstevel@tonic-gate * page(s) are noreloc pages or not. When looking for a noreloc page 18377c478bd9Sstevel@tonic-gate * it is quite easy to end up here even if the global (relocatable) 18387c478bd9Sstevel@tonic-gate * page pool has plenty of free pages but the noreloc pool is empty. 18397c478bd9Sstevel@tonic-gate * 18407c478bd9Sstevel@tonic-gate * When the noreloc pool is empty (or low), additional noreloc pages 18417c478bd9Sstevel@tonic-gate * are created by converting pages from the global page pool. This 18427c478bd9Sstevel@tonic-gate * process will stall during pcf accounting if the pcf bins are 18437c478bd9Sstevel@tonic-gate * already locked. Such is the case when a noreloc allocation is 18447c478bd9Sstevel@tonic-gate * looping here in page_create_get_something waiting for more noreloc 18457c478bd9Sstevel@tonic-gate * pages to appear. 18467c478bd9Sstevel@tonic-gate * 18477c478bd9Sstevel@tonic-gate * Short of adding a new field to the pcf bins to accurately track 18487c478bd9Sstevel@tonic-gate * the number of free noreloc pages, we instead do not grab the 18497c478bd9Sstevel@tonic-gate * pcgs_lock, do not set the pcf blocks and do not timeout when 18507c478bd9Sstevel@tonic-gate * allocating a noreloc page. This allows noreloc allocations to 18517c478bd9Sstevel@tonic-gate * loop without blocking global page pool allocations. 18527c478bd9Sstevel@tonic-gate * 18537c478bd9Sstevel@tonic-gate * NOTE: the behaviour of page_create_get_something has not changed 18547c478bd9Sstevel@tonic-gate * for the case of global page pool allocations. 18557c478bd9Sstevel@tonic-gate */ 18567c478bd9Sstevel@tonic-gate 18577c478bd9Sstevel@tonic-gate flags &= ~PG_MATCH_COLOR; 18587c478bd9Sstevel@tonic-gate locked = 0; 185907ad560dSkchow #if defined(__i386) || defined(__amd64) 1860843e1988Sjohnlev flags = page_create_update_flags_x86(flags); 18617c478bd9Sstevel@tonic-gate #endif 18627c478bd9Sstevel@tonic-gate 18637c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, vaddr, PAGESIZE); 18647c478bd9Sstevel@tonic-gate 1865d94ffb28Sjmcp for (count = 0; kcage_on || count < MAX_PCGS; count++) { 1866d94ffb28Sjmcp pp = page_get_freelist(vp, off, seg, vaddr, PAGESIZE, 18677c478bd9Sstevel@tonic-gate flags, lgrp); 18687c478bd9Sstevel@tonic-gate if (pp == NULL) { 18697c478bd9Sstevel@tonic-gate pp = page_get_cachelist(vp, off, seg, vaddr, 18706e4dd838Smec flags, lgrp); 18717c478bd9Sstevel@tonic-gate } 18727c478bd9Sstevel@tonic-gate if (pp == NULL) { 18737c478bd9Sstevel@tonic-gate /* 18747c478bd9Sstevel@tonic-gate * Serialize. Don't fight with other pcgs(). 18757c478bd9Sstevel@tonic-gate */ 1876d94ffb28Sjmcp if (!locked && (!kcage_on || !(flags & PG_NORELOC))) { 18777c478bd9Sstevel@tonic-gate mutex_enter(&pcgs_lock); 18787c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_locked); 18797c478bd9Sstevel@tonic-gate locked = 1; 18807c478bd9Sstevel@tonic-gate p = pcf; 188106fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 18827c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 18837c478bd9Sstevel@tonic-gate ASSERT(p->pcf_block == 0); 18847c478bd9Sstevel@tonic-gate p->pcf_block = 1; 18857c478bd9Sstevel@tonic-gate p->pcf_reserve = p->pcf_count; 18867c478bd9Sstevel@tonic-gate p->pcf_count = 0; 18877c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 18887c478bd9Sstevel@tonic-gate p++; 18897c478bd9Sstevel@tonic-gate } 18907c478bd9Sstevel@tonic-gate freemem = 0; 18917c478bd9Sstevel@tonic-gate } 18927c478bd9Sstevel@tonic-gate 18937c478bd9Sstevel@tonic-gate if (count) { 18947c478bd9Sstevel@tonic-gate /* 18957c478bd9Sstevel@tonic-gate * Since page_free() puts pages on 18967c478bd9Sstevel@tonic-gate * a list then accounts for it, we 18977c478bd9Sstevel@tonic-gate * just have to wait for page_free() 18987c478bd9Sstevel@tonic-gate * to unlock any page it was working 18997c478bd9Sstevel@tonic-gate * with. The page_lock()-page_reclaim() 19007c478bd9Sstevel@tonic-gate * path falls in the same boat. 19017c478bd9Sstevel@tonic-gate * 19027c478bd9Sstevel@tonic-gate * We don't need to check on the 19037c478bd9Sstevel@tonic-gate * PG_WAIT flag, we have already 19047c478bd9Sstevel@tonic-gate * accounted for the page we are 19057c478bd9Sstevel@tonic-gate * looking for in page_create_va(). 19067c478bd9Sstevel@tonic-gate * 19077c478bd9Sstevel@tonic-gate * We just wait a moment to let any 19087c478bd9Sstevel@tonic-gate * locked pages on the lists free up, 19097c478bd9Sstevel@tonic-gate * then continue around and try again. 19107c478bd9Sstevel@tonic-gate * 19117c478bd9Sstevel@tonic-gate * Will be awakened by set_freemem(). 19127c478bd9Sstevel@tonic-gate */ 19137c478bd9Sstevel@tonic-gate mutex_enter(&pcgs_wait_lock); 19147c478bd9Sstevel@tonic-gate cv_wait(&pcgs_cv, &pcgs_wait_lock); 19157c478bd9Sstevel@tonic-gate mutex_exit(&pcgs_wait_lock); 19167c478bd9Sstevel@tonic-gate } 19177c478bd9Sstevel@tonic-gate } else { 19187c478bd9Sstevel@tonic-gate #ifdef VM_STATS 19197c478bd9Sstevel@tonic-gate if (count >= PCGS_TRIES) { 19207c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_too_many); 19217c478bd9Sstevel@tonic-gate } else { 19227c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_counts[count]); 19237c478bd9Sstevel@tonic-gate } 19247c478bd9Sstevel@tonic-gate #endif 19257c478bd9Sstevel@tonic-gate if (locked) { 19267c478bd9Sstevel@tonic-gate pcgs_unblock(); 19277c478bd9Sstevel@tonic-gate mutex_exit(&pcgs_lock); 19287c478bd9Sstevel@tonic-gate } 19297c478bd9Sstevel@tonic-gate if (cagelocked) 19307c478bd9Sstevel@tonic-gate mutex_exit(&pcgs_cagelock); 19317c478bd9Sstevel@tonic-gate return (pp); 19327c478bd9Sstevel@tonic-gate } 19337c478bd9Sstevel@tonic-gate } 19347c478bd9Sstevel@tonic-gate /* 19357c478bd9Sstevel@tonic-gate * we go down holding the pcf locks. 19367c478bd9Sstevel@tonic-gate */ 19377c478bd9Sstevel@tonic-gate panic("no %spage found %d", 19387c478bd9Sstevel@tonic-gate ((flags & PG_NORELOC) ? "non-reloc " : ""), count); 19397c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 19407c478bd9Sstevel@tonic-gate } 19417c478bd9Sstevel@tonic-gate 19427c478bd9Sstevel@tonic-gate /* 19437c478bd9Sstevel@tonic-gate * Create enough pages for "bytes" worth of data starting at 19447c478bd9Sstevel@tonic-gate * "off" in "vp". 19457c478bd9Sstevel@tonic-gate * 19467c478bd9Sstevel@tonic-gate * Where flag must be one of: 19477c478bd9Sstevel@tonic-gate * 19487c478bd9Sstevel@tonic-gate * PG_EXCL: Exclusive create (fail if any page already 19497c478bd9Sstevel@tonic-gate * exists in the page cache) which does not 19507c478bd9Sstevel@tonic-gate * wait for memory to become available. 19517c478bd9Sstevel@tonic-gate * 19527c478bd9Sstevel@tonic-gate * PG_WAIT: Non-exclusive create which can wait for 19537c478bd9Sstevel@tonic-gate * memory to become available. 19547c478bd9Sstevel@tonic-gate * 19557c478bd9Sstevel@tonic-gate * PG_PHYSCONTIG: Allocate physically contiguous pages. 19567c478bd9Sstevel@tonic-gate * (Not Supported) 19577c478bd9Sstevel@tonic-gate * 19587c478bd9Sstevel@tonic-gate * A doubly linked list of pages is returned to the caller. Each page 19597c478bd9Sstevel@tonic-gate * on the list has the "exclusive" (p_selock) lock and "iolock" (p_iolock) 19607c478bd9Sstevel@tonic-gate * lock. 19617c478bd9Sstevel@tonic-gate * 19627c478bd9Sstevel@tonic-gate * Unable to change the parameters to page_create() in a minor release, 19637c478bd9Sstevel@tonic-gate * we renamed page_create() to page_create_va(), changed all known calls 19647c478bd9Sstevel@tonic-gate * from page_create() to page_create_va(), and created this wrapper. 19657c478bd9Sstevel@tonic-gate * 19667c478bd9Sstevel@tonic-gate * Upon a major release, we should break compatibility by deleting this 19677c478bd9Sstevel@tonic-gate * wrapper, and replacing all the strings "page_create_va", with "page_create". 19687c478bd9Sstevel@tonic-gate * 19697c478bd9Sstevel@tonic-gate * NOTE: There is a copy of this interface as page_create_io() in 19707c478bd9Sstevel@tonic-gate * i86/vm/vm_machdep.c. Any bugs fixed here should be applied 19717c478bd9Sstevel@tonic-gate * there. 19727c478bd9Sstevel@tonic-gate */ 19737c478bd9Sstevel@tonic-gate page_t * 19747c478bd9Sstevel@tonic-gate page_create(vnode_t *vp, u_offset_t off, size_t bytes, uint_t flags) 19757c478bd9Sstevel@tonic-gate { 19767c478bd9Sstevel@tonic-gate caddr_t random_vaddr; 19777c478bd9Sstevel@tonic-gate struct seg kseg; 19787c478bd9Sstevel@tonic-gate 19797c478bd9Sstevel@tonic-gate #ifdef DEBUG 19807c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Using deprecated interface page_create: caller %p", 19817c478bd9Sstevel@tonic-gate (void *)caller()); 19827c478bd9Sstevel@tonic-gate #endif 19837c478bd9Sstevel@tonic-gate 19847c478bd9Sstevel@tonic-gate random_vaddr = (caddr_t)(((uintptr_t)vp >> 7) ^ 19857c478bd9Sstevel@tonic-gate (uintptr_t)(off >> PAGESHIFT)); 19867c478bd9Sstevel@tonic-gate kseg.s_as = &kas; 19877c478bd9Sstevel@tonic-gate 19887c478bd9Sstevel@tonic-gate return (page_create_va(vp, off, bytes, flags, &kseg, random_vaddr)); 19897c478bd9Sstevel@tonic-gate } 19907c478bd9Sstevel@tonic-gate 19917c478bd9Sstevel@tonic-gate #ifdef DEBUG 19927c478bd9Sstevel@tonic-gate uint32_t pg_alloc_pgs_mtbf = 0; 19937c478bd9Sstevel@tonic-gate #endif 19947c478bd9Sstevel@tonic-gate 19957c478bd9Sstevel@tonic-gate /* 19967c478bd9Sstevel@tonic-gate * Used for large page support. It will attempt to allocate 19977c478bd9Sstevel@tonic-gate * a large page(s) off the freelist. 19987c478bd9Sstevel@tonic-gate * 19997c478bd9Sstevel@tonic-gate * Returns non zero on failure. 20007c478bd9Sstevel@tonic-gate */ 20017c478bd9Sstevel@tonic-gate int 2002e44bd21cSsusans page_alloc_pages(struct vnode *vp, struct seg *seg, caddr_t addr, 20032cb27123Saguzovsk page_t **basepp, page_t *ppa[], uint_t szc, int anypgsz, int pgflags) 20047c478bd9Sstevel@tonic-gate { 20057c478bd9Sstevel@tonic-gate pgcnt_t npgs, curnpgs, totpgs; 20067c478bd9Sstevel@tonic-gate size_t pgsz; 20077c478bd9Sstevel@tonic-gate page_t *pplist = NULL, *pp; 20087c478bd9Sstevel@tonic-gate int err = 0; 20097c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 20107c478bd9Sstevel@tonic-gate 20117c478bd9Sstevel@tonic-gate ASSERT(szc != 0 && szc <= (page_num_pagesizes() - 1)); 20122cb27123Saguzovsk ASSERT(pgflags == 0 || pgflags == PG_LOCAL); 20137c478bd9Sstevel@tonic-gate 20142be2af34Smec /* 20152be2af34Smec * Check if system heavily prefers local large pages over remote 20162be2af34Smec * on systems with multiple lgroups. 20172be2af34Smec */ 20182be2af34Smec if (lpg_alloc_prefer == LPAP_LOCAL && nlgrps > 1) { 20192be2af34Smec pgflags = PG_LOCAL; 20202be2af34Smec } 20212be2af34Smec 20227c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[0]); 20237c478bd9Sstevel@tonic-gate 20247c478bd9Sstevel@tonic-gate #ifdef DEBUG 20257c478bd9Sstevel@tonic-gate if (pg_alloc_pgs_mtbf && !(gethrtime() % pg_alloc_pgs_mtbf)) { 20267c478bd9Sstevel@tonic-gate return (ENOMEM); 20277c478bd9Sstevel@tonic-gate } 20287c478bd9Sstevel@tonic-gate #endif 20297c478bd9Sstevel@tonic-gate 20307c478bd9Sstevel@tonic-gate /* 20317c478bd9Sstevel@tonic-gate * One must be NULL but not both. 20327c478bd9Sstevel@tonic-gate * And one must be non NULL but not both. 20337c478bd9Sstevel@tonic-gate */ 20347c478bd9Sstevel@tonic-gate ASSERT(basepp != NULL || ppa != NULL); 20357c478bd9Sstevel@tonic-gate ASSERT(basepp == NULL || ppa == NULL); 20367c478bd9Sstevel@tonic-gate 203778b03d3aSkchow #if defined(__i386) || defined(__amd64) 203878b03d3aSkchow while (page_chk_freelist(szc) == 0) { 203978b03d3aSkchow VM_STAT_ADD(alloc_pages[8]); 204078b03d3aSkchow if (anypgsz == 0 || --szc == 0) 204178b03d3aSkchow return (ENOMEM); 204278b03d3aSkchow } 204378b03d3aSkchow #endif 204478b03d3aSkchow 204578b03d3aSkchow pgsz = page_get_pagesize(szc); 204678b03d3aSkchow totpgs = curnpgs = npgs = pgsz >> PAGESHIFT; 204778b03d3aSkchow 204878b03d3aSkchow ASSERT(((uintptr_t)addr & (pgsz - 1)) == 0); 204978b03d3aSkchow 20507c478bd9Sstevel@tonic-gate (void) page_create_wait(npgs, PG_WAIT); 20517c478bd9Sstevel@tonic-gate 20527c478bd9Sstevel@tonic-gate while (npgs && szc) { 20537c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, addr, pgsz); 20542cb27123Saguzovsk if (pgflags == PG_LOCAL) { 2055d94ffb28Sjmcp pp = page_get_freelist(vp, 0, seg, addr, pgsz, 20562cb27123Saguzovsk pgflags, lgrp); 20572cb27123Saguzovsk if (pp == NULL) { 2058d94ffb28Sjmcp pp = page_get_freelist(vp, 0, seg, addr, pgsz, 20592cb27123Saguzovsk 0, lgrp); 20602cb27123Saguzovsk } 20612cb27123Saguzovsk } else { 2062d94ffb28Sjmcp pp = page_get_freelist(vp, 0, seg, addr, pgsz, 20632cb27123Saguzovsk 0, lgrp); 20642cb27123Saguzovsk } 20657c478bd9Sstevel@tonic-gate if (pp != NULL) { 20667c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[1]); 20677c478bd9Sstevel@tonic-gate page_list_concat(&pplist, &pp); 20687c478bd9Sstevel@tonic-gate ASSERT(npgs >= curnpgs); 20697c478bd9Sstevel@tonic-gate npgs -= curnpgs; 20707c478bd9Sstevel@tonic-gate } else if (anypgsz) { 20717c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[2]); 20727c478bd9Sstevel@tonic-gate szc--; 20737c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(szc); 20747c478bd9Sstevel@tonic-gate curnpgs = pgsz >> PAGESHIFT; 20757c478bd9Sstevel@tonic-gate } else { 20767c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[3]); 20777c478bd9Sstevel@tonic-gate ASSERT(npgs == totpgs); 20787c478bd9Sstevel@tonic-gate page_create_putback(npgs); 20797c478bd9Sstevel@tonic-gate return (ENOMEM); 20807c478bd9Sstevel@tonic-gate } 20817c478bd9Sstevel@tonic-gate } 20827c478bd9Sstevel@tonic-gate if (szc == 0) { 20837c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[4]); 20847c478bd9Sstevel@tonic-gate ASSERT(npgs != 0); 20857c478bd9Sstevel@tonic-gate page_create_putback(npgs); 20867c478bd9Sstevel@tonic-gate err = ENOMEM; 20877c478bd9Sstevel@tonic-gate } else if (basepp != NULL) { 20887c478bd9Sstevel@tonic-gate ASSERT(npgs == 0); 20897c478bd9Sstevel@tonic-gate ASSERT(ppa == NULL); 20907c478bd9Sstevel@tonic-gate *basepp = pplist; 20917c478bd9Sstevel@tonic-gate } 20927c478bd9Sstevel@tonic-gate 20937c478bd9Sstevel@tonic-gate npgs = totpgs - npgs; 20947c478bd9Sstevel@tonic-gate pp = pplist; 20957c478bd9Sstevel@tonic-gate 20967c478bd9Sstevel@tonic-gate /* 20977c478bd9Sstevel@tonic-gate * Clear the free and age bits. Also if we were passed in a ppa then 20987c478bd9Sstevel@tonic-gate * fill it in with all the constituent pages from the large page. But 20997c478bd9Sstevel@tonic-gate * if we failed to allocate all the pages just free what we got. 21007c478bd9Sstevel@tonic-gate */ 21017c478bd9Sstevel@tonic-gate while (npgs != 0) { 21027c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(pp)); 21037c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp)); 21047c478bd9Sstevel@tonic-gate if (ppa != NULL || err != 0) { 21057c478bd9Sstevel@tonic-gate if (err == 0) { 21067c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[5]); 21077c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 21087c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 21097c478bd9Sstevel@tonic-gate page_sub(&pplist, pp); 21107c478bd9Sstevel@tonic-gate *ppa++ = pp; 21117c478bd9Sstevel@tonic-gate npgs--; 21127c478bd9Sstevel@tonic-gate } else { 21137c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[6]); 21147c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc != 0); 21157c478bd9Sstevel@tonic-gate curnpgs = page_get_pagecnt(pp->p_szc); 21167c478bd9Sstevel@tonic-gate page_list_break(&pp, &pplist, curnpgs); 21177c478bd9Sstevel@tonic-gate page_list_add_pages(pp, 0); 21187c478bd9Sstevel@tonic-gate page_create_putback(curnpgs); 21197c478bd9Sstevel@tonic-gate ASSERT(npgs >= curnpgs); 21207c478bd9Sstevel@tonic-gate npgs -= curnpgs; 21217c478bd9Sstevel@tonic-gate } 21227c478bd9Sstevel@tonic-gate pp = pplist; 21237c478bd9Sstevel@tonic-gate } else { 21247c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[7]); 21257c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 21267c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 21277c478bd9Sstevel@tonic-gate pp = pp->p_next; 21287c478bd9Sstevel@tonic-gate npgs--; 21297c478bd9Sstevel@tonic-gate } 21307c478bd9Sstevel@tonic-gate } 21317c478bd9Sstevel@tonic-gate return (err); 21327c478bd9Sstevel@tonic-gate } 21337c478bd9Sstevel@tonic-gate 21347c478bd9Sstevel@tonic-gate /* 21357c478bd9Sstevel@tonic-gate * Get a single large page off of the freelists, and set it up for use. 21367c478bd9Sstevel@tonic-gate * Number of bytes requested must be a supported page size. 21377c478bd9Sstevel@tonic-gate * 21387c478bd9Sstevel@tonic-gate * Note that this call may fail even if there is sufficient 21397c478bd9Sstevel@tonic-gate * memory available or PG_WAIT is set, so the caller must 21407c478bd9Sstevel@tonic-gate * be willing to fallback on page_create_va(), block and retry, 21417c478bd9Sstevel@tonic-gate * or fail the requester. 21427c478bd9Sstevel@tonic-gate */ 21437c478bd9Sstevel@tonic-gate page_t * 21447c478bd9Sstevel@tonic-gate page_create_va_large(vnode_t *vp, u_offset_t off, size_t bytes, uint_t flags, 21457c478bd9Sstevel@tonic-gate struct seg *seg, caddr_t vaddr, void *arg) 21467c478bd9Sstevel@tonic-gate { 214706fb6a36Sdv pgcnt_t npages; 21487c478bd9Sstevel@tonic-gate page_t *pp; 21497c478bd9Sstevel@tonic-gate page_t *rootpp; 21507c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 21517c478bd9Sstevel@tonic-gate lgrp_id_t *lgrpid = (lgrp_id_t *)arg; 21527c478bd9Sstevel@tonic-gate 21537c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 21547c478bd9Sstevel@tonic-gate 21557c478bd9Sstevel@tonic-gate ASSERT((flags & ~(PG_EXCL | PG_WAIT | 215623a80de1SStan Studzinski PG_NORELOC | PG_PANIC | PG_PUSHPAGE | PG_NORMALPRI)) == 0); 21577c478bd9Sstevel@tonic-gate /* but no others */ 21587c478bd9Sstevel@tonic-gate 21597c478bd9Sstevel@tonic-gate ASSERT((flags & PG_EXCL) == PG_EXCL); 21607c478bd9Sstevel@tonic-gate 21617c478bd9Sstevel@tonic-gate npages = btop(bytes); 21627c478bd9Sstevel@tonic-gate 21637c478bd9Sstevel@tonic-gate if (!kcage_on || panicstr) { 21647c478bd9Sstevel@tonic-gate /* 2165d94ffb28Sjmcp * Cage is OFF, or we are single threaded in 2166d94ffb28Sjmcp * panic, so make everything a RELOC request. 21677c478bd9Sstevel@tonic-gate */ 21687c478bd9Sstevel@tonic-gate flags &= ~PG_NORELOC; 21697c478bd9Sstevel@tonic-gate } 21707c478bd9Sstevel@tonic-gate 21717c478bd9Sstevel@tonic-gate /* 21727c478bd9Sstevel@tonic-gate * Make sure there's adequate physical memory available. 21737c478bd9Sstevel@tonic-gate * Note: PG_WAIT is ignored here. 21747c478bd9Sstevel@tonic-gate */ 21757c478bd9Sstevel@tonic-gate if (freemem <= throttlefree + npages) { 21767c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[1]); 21777c478bd9Sstevel@tonic-gate return (NULL); 21787c478bd9Sstevel@tonic-gate } 21797c478bd9Sstevel@tonic-gate 21807c478bd9Sstevel@tonic-gate /* 2181d94ffb28Sjmcp * If cage is on, dampen draw from cage when available 2182d94ffb28Sjmcp * cage space is low. 21837c478bd9Sstevel@tonic-gate */ 2184d94ffb28Sjmcp if ((flags & (PG_NORELOC | PG_WAIT)) == (PG_NORELOC | PG_WAIT) && 2185d94ffb28Sjmcp kcage_freemem < kcage_throttlefree + npages) { 2186d94ffb28Sjmcp 2187d94ffb28Sjmcp /* 2188d94ffb28Sjmcp * The cage is on, the caller wants PG_NORELOC 2189d94ffb28Sjmcp * pages and available cage memory is very low. 2190d94ffb28Sjmcp * Call kcage_create_throttle() to attempt to 2191d94ffb28Sjmcp * control demand on the cage. 2192d94ffb28Sjmcp */ 2193d94ffb28Sjmcp if (kcage_create_throttle(npages, flags) == KCT_FAILURE) { 2194d94ffb28Sjmcp VM_STAT_ADD(page_create_large_cnt[2]); 2195d94ffb28Sjmcp return (NULL); 2196d94ffb28Sjmcp } 21977c478bd9Sstevel@tonic-gate } 21987c478bd9Sstevel@tonic-gate 219906fb6a36Sdv if (!pcf_decrement_bucket(npages) && 220006fb6a36Sdv !pcf_decrement_multiple(NULL, npages, 1)) { 220106fb6a36Sdv VM_STAT_ADD(page_create_large_cnt[4]); 220206fb6a36Sdv return (NULL); 22037c478bd9Sstevel@tonic-gate } 22047c478bd9Sstevel@tonic-gate 22057c478bd9Sstevel@tonic-gate /* 22067c478bd9Sstevel@tonic-gate * This is where this function behaves fundamentally differently 22077c478bd9Sstevel@tonic-gate * than page_create_va(); since we're intending to map the page 22087c478bd9Sstevel@tonic-gate * with a single TTE, we have to get it as a physically contiguous 22097c478bd9Sstevel@tonic-gate * hardware pagesize chunk. If we can't, we fail. 22107c478bd9Sstevel@tonic-gate */ 22117c478bd9Sstevel@tonic-gate if (lgrpid != NULL && *lgrpid >= 0 && *lgrpid <= lgrp_alloc_max && 22126e4dd838Smec LGRP_EXISTS(lgrp_table[*lgrpid])) 22137c478bd9Sstevel@tonic-gate lgrp = lgrp_table[*lgrpid]; 22147c478bd9Sstevel@tonic-gate else 22157c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, vaddr, bytes); 22167c478bd9Sstevel@tonic-gate 2217d94ffb28Sjmcp if ((rootpp = page_get_freelist(&kvp, off, seg, vaddr, 2218d94ffb28Sjmcp bytes, flags & ~PG_MATCH_COLOR, lgrp)) == NULL) { 22197c478bd9Sstevel@tonic-gate page_create_putback(npages); 22207c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[5]); 22217c478bd9Sstevel@tonic-gate return (NULL); 22227c478bd9Sstevel@tonic-gate } 22237c478bd9Sstevel@tonic-gate 22247c478bd9Sstevel@tonic-gate /* 22257c478bd9Sstevel@tonic-gate * if we got the page with the wrong mtype give it back this is a 22267c478bd9Sstevel@tonic-gate * workaround for CR 6249718. When CR 6249718 is fixed we never get 22277c478bd9Sstevel@tonic-gate * inside "if" and the workaround becomes just a nop 22287c478bd9Sstevel@tonic-gate */ 22297c478bd9Sstevel@tonic-gate if (kcage_on && (flags & PG_NORELOC) && !PP_ISNORELOC(rootpp)) { 22307c478bd9Sstevel@tonic-gate page_list_add_pages(rootpp, 0); 22317c478bd9Sstevel@tonic-gate page_create_putback(npages); 22327c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[6]); 22337c478bd9Sstevel@tonic-gate return (NULL); 22347c478bd9Sstevel@tonic-gate } 22357c478bd9Sstevel@tonic-gate 22367c478bd9Sstevel@tonic-gate /* 22377c478bd9Sstevel@tonic-gate * If satisfying this request has left us with too little 22387c478bd9Sstevel@tonic-gate * memory, start the wheels turning to get some back. The 22397c478bd9Sstevel@tonic-gate * first clause of the test prevents waking up the pageout 22407c478bd9Sstevel@tonic-gate * daemon in situations where it would decide that there's 22417c478bd9Sstevel@tonic-gate * nothing to do. 22427c478bd9Sstevel@tonic-gate */ 22437c478bd9Sstevel@tonic-gate if (nscan < desscan && freemem < minfree) { 22447c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGEOUT_CV_SIGNAL, 22457c478bd9Sstevel@tonic-gate "pageout_cv_signal:freemem %ld", freemem); 22467c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 22477c478bd9Sstevel@tonic-gate } 22487c478bd9Sstevel@tonic-gate 22497c478bd9Sstevel@tonic-gate pp = rootpp; 22507c478bd9Sstevel@tonic-gate while (npages--) { 22517c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 22527c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == NULL); 22537c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 22547c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 22557c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 22567c478bd9Sstevel@tonic-gate if (!page_hashin(pp, vp, off, NULL)) 22577c478bd9Sstevel@tonic-gate panic("page_create_large: hashin failed: page %p", 22587c478bd9Sstevel@tonic-gate (void *)pp); 22597c478bd9Sstevel@tonic-gate page_io_lock(pp); 22607c478bd9Sstevel@tonic-gate off += PAGESIZE; 22617c478bd9Sstevel@tonic-gate pp = pp->p_next; 22627c478bd9Sstevel@tonic-gate } 22637c478bd9Sstevel@tonic-gate 22647c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[0]); 22657c478bd9Sstevel@tonic-gate return (rootpp); 22667c478bd9Sstevel@tonic-gate } 22677c478bd9Sstevel@tonic-gate 22687c478bd9Sstevel@tonic-gate page_t * 22697c478bd9Sstevel@tonic-gate page_create_va(vnode_t *vp, u_offset_t off, size_t bytes, uint_t flags, 22707c478bd9Sstevel@tonic-gate struct seg *seg, caddr_t vaddr) 22717c478bd9Sstevel@tonic-gate { 22727c478bd9Sstevel@tonic-gate page_t *plist = NULL; 22737c478bd9Sstevel@tonic-gate pgcnt_t npages; 22747c478bd9Sstevel@tonic-gate pgcnt_t found_on_free = 0; 22757c478bd9Sstevel@tonic-gate pgcnt_t pages_req; 22767c478bd9Sstevel@tonic-gate page_t *npp = NULL; 22777c478bd9Sstevel@tonic-gate struct pcf *p; 22787c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 22797c478bd9Sstevel@tonic-gate 22807c478bd9Sstevel@tonic-gate TRACE_4(TR_FAC_VM, TR_PAGE_CREATE_START, 22816e4dd838Smec "page_create_start:vp %p off %llx bytes %lu flags %x", 22826e4dd838Smec vp, off, bytes, flags); 22837c478bd9Sstevel@tonic-gate 22847c478bd9Sstevel@tonic-gate ASSERT(bytes != 0 && vp != NULL); 22857c478bd9Sstevel@tonic-gate 22867c478bd9Sstevel@tonic-gate if ((flags & PG_EXCL) == 0 && (flags & PG_WAIT) == 0) { 22877c478bd9Sstevel@tonic-gate panic("page_create: invalid flags"); 22887c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 22897c478bd9Sstevel@tonic-gate } 22907c478bd9Sstevel@tonic-gate ASSERT((flags & ~(PG_EXCL | PG_WAIT | 229123a80de1SStan Studzinski PG_NORELOC | PG_PANIC | PG_PUSHPAGE | PG_NORMALPRI)) == 0); 22927c478bd9Sstevel@tonic-gate /* but no others */ 22937c478bd9Sstevel@tonic-gate 22947c478bd9Sstevel@tonic-gate pages_req = npages = btopr(bytes); 22957c478bd9Sstevel@tonic-gate /* 22967c478bd9Sstevel@tonic-gate * Try to see whether request is too large to *ever* be 22977c478bd9Sstevel@tonic-gate * satisfied, in order to prevent deadlock. We arbitrarily 22987c478bd9Sstevel@tonic-gate * decide to limit maximum size requests to max_page_get. 22997c478bd9Sstevel@tonic-gate */ 23007c478bd9Sstevel@tonic-gate if (npages >= max_page_get) { 23017c478bd9Sstevel@tonic-gate if ((flags & PG_WAIT) == 0) { 23027c478bd9Sstevel@tonic-gate TRACE_4(TR_FAC_VM, TR_PAGE_CREATE_TOOBIG, 23037c478bd9Sstevel@tonic-gate "page_create_toobig:vp %p off %llx npages " 23047c478bd9Sstevel@tonic-gate "%lu max_page_get %lu", 23057c478bd9Sstevel@tonic-gate vp, off, npages, max_page_get); 23067c478bd9Sstevel@tonic-gate return (NULL); 23077c478bd9Sstevel@tonic-gate } else { 23087c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 23097c478bd9Sstevel@tonic-gate "Request for too much kernel memory " 23107c478bd9Sstevel@tonic-gate "(%lu bytes), will hang forever", bytes); 23117c478bd9Sstevel@tonic-gate for (;;) 23127c478bd9Sstevel@tonic-gate delay(1000000000); 23137c478bd9Sstevel@tonic-gate } 23147c478bd9Sstevel@tonic-gate } 23157c478bd9Sstevel@tonic-gate 23167c478bd9Sstevel@tonic-gate if (!kcage_on || panicstr) { 23177c478bd9Sstevel@tonic-gate /* 2318d94ffb28Sjmcp * Cage is OFF, or we are single threaded in 2319d94ffb28Sjmcp * panic, so make everything a RELOC request. 23207c478bd9Sstevel@tonic-gate */ 23217c478bd9Sstevel@tonic-gate flags &= ~PG_NORELOC; 23227c478bd9Sstevel@tonic-gate } 23237c478bd9Sstevel@tonic-gate 2324d94ffb28Sjmcp if (freemem <= throttlefree + npages) 2325d94ffb28Sjmcp if (!page_create_throttle(npages, flags)) 23267c478bd9Sstevel@tonic-gate return (NULL); 23277c478bd9Sstevel@tonic-gate 23287c478bd9Sstevel@tonic-gate /* 2329d94ffb28Sjmcp * If cage is on, dampen draw from cage when available 2330d94ffb28Sjmcp * cage space is low. 23317c478bd9Sstevel@tonic-gate */ 2332d94ffb28Sjmcp if ((flags & PG_NORELOC) && 2333d94ffb28Sjmcp kcage_freemem < kcage_throttlefree + npages) { 23347c478bd9Sstevel@tonic-gate 2335d94ffb28Sjmcp /* 2336d94ffb28Sjmcp * The cage is on, the caller wants PG_NORELOC 2337d94ffb28Sjmcp * pages and available cage memory is very low. 2338d94ffb28Sjmcp * Call kcage_create_throttle() to attempt to 2339d94ffb28Sjmcp * control demand on the cage. 2340d94ffb28Sjmcp */ 2341d94ffb28Sjmcp if (kcage_create_throttle(npages, flags) == KCT_FAILURE) 2342d94ffb28Sjmcp return (NULL); 23437c478bd9Sstevel@tonic-gate } 23447c478bd9Sstevel@tonic-gate 23457c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[0]); 23467c478bd9Sstevel@tonic-gate 234706fb6a36Sdv if (!pcf_decrement_bucket(npages)) { 23487c478bd9Sstevel@tonic-gate /* 23497c478bd9Sstevel@tonic-gate * Have to look harder. If npages is greater than 2350da6c28aaSamw * one, then we might have to coalesce the counters. 23517c478bd9Sstevel@tonic-gate * 23527c478bd9Sstevel@tonic-gate * Go wait. We come back having accounted 23537c478bd9Sstevel@tonic-gate * for the memory. 23547c478bd9Sstevel@tonic-gate */ 23557c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[1]); 23567c478bd9Sstevel@tonic-gate if (!page_create_wait(npages, flags)) { 23577c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[2]); 23587c478bd9Sstevel@tonic-gate return (NULL); 23597c478bd9Sstevel@tonic-gate } 23607c478bd9Sstevel@tonic-gate } 23617c478bd9Sstevel@tonic-gate 23627c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SUCCESS, 23636e4dd838Smec "page_create_success:vp %p off %llx", vp, off); 23647c478bd9Sstevel@tonic-gate 23657c478bd9Sstevel@tonic-gate /* 23667c478bd9Sstevel@tonic-gate * If satisfying this request has left us with too little 23677c478bd9Sstevel@tonic-gate * memory, start the wheels turning to get some back. The 23687c478bd9Sstevel@tonic-gate * first clause of the test prevents waking up the pageout 23697c478bd9Sstevel@tonic-gate * daemon in situations where it would decide that there's 23707c478bd9Sstevel@tonic-gate * nothing to do. 23717c478bd9Sstevel@tonic-gate */ 23727c478bd9Sstevel@tonic-gate if (nscan < desscan && freemem < minfree) { 23737c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGEOUT_CV_SIGNAL, 23746e4dd838Smec "pageout_cv_signal:freemem %ld", freemem); 23757c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 23767c478bd9Sstevel@tonic-gate } 23777c478bd9Sstevel@tonic-gate 23787c478bd9Sstevel@tonic-gate /* 23797c478bd9Sstevel@tonic-gate * Loop around collecting the requested number of pages. 23807c478bd9Sstevel@tonic-gate * Most of the time, we have to `create' a new page. With 23817c478bd9Sstevel@tonic-gate * this in mind, pull the page off the free list before 23827c478bd9Sstevel@tonic-gate * getting the hash lock. This will minimize the hash 23837c478bd9Sstevel@tonic-gate * lock hold time, nesting, and the like. If it turns 23847c478bd9Sstevel@tonic-gate * out we don't need the page, we put it back at the end. 23857c478bd9Sstevel@tonic-gate */ 23867c478bd9Sstevel@tonic-gate while (npages--) { 23877c478bd9Sstevel@tonic-gate page_t *pp; 23887c478bd9Sstevel@tonic-gate kmutex_t *phm = NULL; 23897c478bd9Sstevel@tonic-gate ulong_t index; 23907c478bd9Sstevel@tonic-gate 23917c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 23927c478bd9Sstevel@tonic-gate top: 23937c478bd9Sstevel@tonic-gate ASSERT(phm == NULL); 23947c478bd9Sstevel@tonic-gate ASSERT(index == PAGE_HASH_FUNC(vp, off)); 23957c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 23967c478bd9Sstevel@tonic-gate 23977c478bd9Sstevel@tonic-gate if (npp == NULL) { 23987c478bd9Sstevel@tonic-gate /* 23997c478bd9Sstevel@tonic-gate * Try to get a page from the freelist (ie, 24007c478bd9Sstevel@tonic-gate * a page with no [vp, off] tag). If that 24017c478bd9Sstevel@tonic-gate * fails, use the cachelist. 24027c478bd9Sstevel@tonic-gate * 24037c478bd9Sstevel@tonic-gate * During the first attempt at both the free 24047c478bd9Sstevel@tonic-gate * and cache lists we try for the correct color. 24057c478bd9Sstevel@tonic-gate */ 24067c478bd9Sstevel@tonic-gate /* 24077c478bd9Sstevel@tonic-gate * XXXX-how do we deal with virtual indexed 24087c478bd9Sstevel@tonic-gate * caches and and colors? 24097c478bd9Sstevel@tonic-gate */ 24107c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[4]); 24117c478bd9Sstevel@tonic-gate /* 24127c478bd9Sstevel@tonic-gate * Get lgroup to allocate next page of shared memory 24137c478bd9Sstevel@tonic-gate * from and use it to specify where to allocate 24147c478bd9Sstevel@tonic-gate * the physical memory 24157c478bd9Sstevel@tonic-gate */ 24167c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, vaddr, PAGESIZE); 2417d94ffb28Sjmcp npp = page_get_freelist(vp, off, seg, vaddr, PAGESIZE, 24187c478bd9Sstevel@tonic-gate flags | PG_MATCH_COLOR, lgrp); 24197c478bd9Sstevel@tonic-gate if (npp == NULL) { 24207c478bd9Sstevel@tonic-gate npp = page_get_cachelist(vp, off, seg, 24217c478bd9Sstevel@tonic-gate vaddr, flags | PG_MATCH_COLOR, lgrp); 24227c478bd9Sstevel@tonic-gate if (npp == NULL) { 24237c478bd9Sstevel@tonic-gate npp = page_create_get_something(vp, 24247c478bd9Sstevel@tonic-gate off, seg, vaddr, 24257c478bd9Sstevel@tonic-gate flags & ~PG_MATCH_COLOR); 24267c478bd9Sstevel@tonic-gate } 24277c478bd9Sstevel@tonic-gate 24287c478bd9Sstevel@tonic-gate if (PP_ISAGED(npp) == 0) { 24297c478bd9Sstevel@tonic-gate /* 24307c478bd9Sstevel@tonic-gate * Since this page came from the 24317c478bd9Sstevel@tonic-gate * cachelist, we must destroy the 24327c478bd9Sstevel@tonic-gate * old vnode association. 24337c478bd9Sstevel@tonic-gate */ 24347c478bd9Sstevel@tonic-gate page_hashout(npp, NULL); 24357c478bd9Sstevel@tonic-gate } 24367c478bd9Sstevel@tonic-gate } 24377c478bd9Sstevel@tonic-gate } 24387c478bd9Sstevel@tonic-gate 24397c478bd9Sstevel@tonic-gate /* 24407c478bd9Sstevel@tonic-gate * We own this page! 24417c478bd9Sstevel@tonic-gate */ 24427c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(npp)); 24437c478bd9Sstevel@tonic-gate ASSERT(npp->p_vnode == NULL); 24447c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(npp)); 24457c478bd9Sstevel@tonic-gate PP_CLRFREE(npp); 24467c478bd9Sstevel@tonic-gate PP_CLRAGED(npp); 24477c478bd9Sstevel@tonic-gate 24487c478bd9Sstevel@tonic-gate /* 24497c478bd9Sstevel@tonic-gate * Here we have a page in our hot little mits and are 24507c478bd9Sstevel@tonic-gate * just waiting to stuff it on the appropriate lists. 24517c478bd9Sstevel@tonic-gate * Get the mutex and check to see if it really does 24527c478bd9Sstevel@tonic-gate * not exist. 24537c478bd9Sstevel@tonic-gate */ 24547c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 24557c478bd9Sstevel@tonic-gate mutex_enter(phm); 2456e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 24577c478bd9Sstevel@tonic-gate if (pp == NULL) { 24587c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_new); 24597c478bd9Sstevel@tonic-gate pp = npp; 24607c478bd9Sstevel@tonic-gate npp = NULL; 24617c478bd9Sstevel@tonic-gate if (!page_hashin(pp, vp, off, phm)) { 24627c478bd9Sstevel@tonic-gate /* 24637c478bd9Sstevel@tonic-gate * Since we hold the page hash mutex and 24647c478bd9Sstevel@tonic-gate * just searched for this page, page_hashin 24657c478bd9Sstevel@tonic-gate * had better not fail. If it does, that 24667c478bd9Sstevel@tonic-gate * means somethread did not follow the 24677c478bd9Sstevel@tonic-gate * page hash mutex rules. Panic now and 24687c478bd9Sstevel@tonic-gate * get it over with. As usual, go down 24697c478bd9Sstevel@tonic-gate * holding all the locks. 24707c478bd9Sstevel@tonic-gate */ 24717c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 24727c478bd9Sstevel@tonic-gate panic("page_create: " 24737c478bd9Sstevel@tonic-gate "hashin failed %p %p %llx %p", 24747c478bd9Sstevel@tonic-gate (void *)pp, (void *)vp, off, (void *)phm); 24757c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 24767c478bd9Sstevel@tonic-gate } 24777c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 24787c478bd9Sstevel@tonic-gate mutex_exit(phm); 24797c478bd9Sstevel@tonic-gate phm = NULL; 24807c478bd9Sstevel@tonic-gate 24817c478bd9Sstevel@tonic-gate /* 24827c478bd9Sstevel@tonic-gate * Hat layer locking need not be done to set 24837c478bd9Sstevel@tonic-gate * the following bits since the page is not hashed 24847c478bd9Sstevel@tonic-gate * and was on the free list (i.e., had no mappings). 24857c478bd9Sstevel@tonic-gate * 24867c478bd9Sstevel@tonic-gate * Set the reference bit to protect 24877c478bd9Sstevel@tonic-gate * against immediate pageout 24887c478bd9Sstevel@tonic-gate * 24897c478bd9Sstevel@tonic-gate * XXXmh modify freelist code to set reference 24907c478bd9Sstevel@tonic-gate * bit so we don't have to do it here. 24917c478bd9Sstevel@tonic-gate */ 24927c478bd9Sstevel@tonic-gate page_set_props(pp, P_REF); 24937c478bd9Sstevel@tonic-gate found_on_free++; 24947c478bd9Sstevel@tonic-gate } else { 24957c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_exists); 24967c478bd9Sstevel@tonic-gate if (flags & PG_EXCL) { 24977c478bd9Sstevel@tonic-gate /* 24987c478bd9Sstevel@tonic-gate * Found an existing page, and the caller 24997c478bd9Sstevel@tonic-gate * wanted all new pages. Undo all of the work 25007c478bd9Sstevel@tonic-gate * we have done. 25017c478bd9Sstevel@tonic-gate */ 25027c478bd9Sstevel@tonic-gate mutex_exit(phm); 25037c478bd9Sstevel@tonic-gate phm = NULL; 25047c478bd9Sstevel@tonic-gate while (plist != NULL) { 25057c478bd9Sstevel@tonic-gate pp = plist; 25067c478bd9Sstevel@tonic-gate page_sub(&plist, pp); 25077c478bd9Sstevel@tonic-gate page_io_unlock(pp); 25087c478bd9Sstevel@tonic-gate /* large pages should not end up here */ 25097c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 25107c478bd9Sstevel@tonic-gate /*LINTED: constant in conditional ctx*/ 25117c478bd9Sstevel@tonic-gate VN_DISPOSE(pp, B_INVAL, 0, kcred); 25127c478bd9Sstevel@tonic-gate } 25137c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_found_one); 25147c478bd9Sstevel@tonic-gate goto fail; 25157c478bd9Sstevel@tonic-gate } 25167c478bd9Sstevel@tonic-gate ASSERT(flags & PG_WAIT); 25177c478bd9Sstevel@tonic-gate if (!page_lock(pp, SE_EXCL, phm, P_NO_RECLAIM)) { 25187c478bd9Sstevel@tonic-gate /* 25197c478bd9Sstevel@tonic-gate * Start all over again if we blocked trying 25207c478bd9Sstevel@tonic-gate * to lock the page. 25217c478bd9Sstevel@tonic-gate */ 25227c478bd9Sstevel@tonic-gate mutex_exit(phm); 25237c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_page_lock_failed); 25247c478bd9Sstevel@tonic-gate phm = NULL; 25257c478bd9Sstevel@tonic-gate goto top; 25267c478bd9Sstevel@tonic-gate } 25277c478bd9Sstevel@tonic-gate mutex_exit(phm); 25287c478bd9Sstevel@tonic-gate phm = NULL; 25297c478bd9Sstevel@tonic-gate 25307c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 25317c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp) == 0); 25327c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_get_cache); 25337c478bd9Sstevel@tonic-gate page_list_sub(pp, PG_CACHE_LIST); 25347c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 25357c478bd9Sstevel@tonic-gate found_on_free++; 25367c478bd9Sstevel@tonic-gate } 25377c478bd9Sstevel@tonic-gate } 25387c478bd9Sstevel@tonic-gate 25397c478bd9Sstevel@tonic-gate /* 25407c478bd9Sstevel@tonic-gate * Got a page! It is locked. Acquire the i/o 25417c478bd9Sstevel@tonic-gate * lock since we are going to use the p_next and 25427c478bd9Sstevel@tonic-gate * p_prev fields to link the requested pages together. 25437c478bd9Sstevel@tonic-gate */ 25447c478bd9Sstevel@tonic-gate page_io_lock(pp); 25457c478bd9Sstevel@tonic-gate page_add(&plist, pp); 25467c478bd9Sstevel@tonic-gate plist = plist->p_next; 25477c478bd9Sstevel@tonic-gate off += PAGESIZE; 25487c478bd9Sstevel@tonic-gate vaddr += PAGESIZE; 25497c478bd9Sstevel@tonic-gate } 25507c478bd9Sstevel@tonic-gate 25517c478bd9Sstevel@tonic-gate ASSERT((flags & PG_EXCL) ? (found_on_free == pages_req) : 1); 25527c478bd9Sstevel@tonic-gate fail: 25537c478bd9Sstevel@tonic-gate if (npp != NULL) { 25547c478bd9Sstevel@tonic-gate /* 25557c478bd9Sstevel@tonic-gate * Did not need this page after all. 25567c478bd9Sstevel@tonic-gate * Put it back on the free list. 25577c478bd9Sstevel@tonic-gate */ 25587c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_putbacks); 25597c478bd9Sstevel@tonic-gate PP_SETFREE(npp); 25607c478bd9Sstevel@tonic-gate PP_SETAGED(npp); 25617c478bd9Sstevel@tonic-gate npp->p_offset = (u_offset_t)-1; 25627c478bd9Sstevel@tonic-gate page_list_add(npp, PG_FREE_LIST | PG_LIST_TAIL); 25637c478bd9Sstevel@tonic-gate page_unlock(npp); 2564d94ffb28Sjmcp 25657c478bd9Sstevel@tonic-gate } 25667c478bd9Sstevel@tonic-gate 25677c478bd9Sstevel@tonic-gate ASSERT(pages_req >= found_on_free); 25687c478bd9Sstevel@tonic-gate 25697c478bd9Sstevel@tonic-gate { 25707c478bd9Sstevel@tonic-gate uint_t overshoot = (uint_t)(pages_req - found_on_free); 25717c478bd9Sstevel@tonic-gate 25727c478bd9Sstevel@tonic-gate if (overshoot) { 25737c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_overshoot); 257406fb6a36Sdv p = &pcf[PCF_INDEX()]; 25757c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 25767c478bd9Sstevel@tonic-gate if (p->pcf_block) { 25777c478bd9Sstevel@tonic-gate p->pcf_reserve += overshoot; 25787c478bd9Sstevel@tonic-gate } else { 25797c478bd9Sstevel@tonic-gate p->pcf_count += overshoot; 25807c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 25817c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 25827c478bd9Sstevel@tonic-gate if (freemem_wait) { 25837c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 25847c478bd9Sstevel@tonic-gate p->pcf_wait--; 25857c478bd9Sstevel@tonic-gate } else { 25867c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 25877c478bd9Sstevel@tonic-gate } 25887c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 25897c478bd9Sstevel@tonic-gate } 25907c478bd9Sstevel@tonic-gate } 25917c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 25927c478bd9Sstevel@tonic-gate /* freemem is approximate, so this test OK */ 25937c478bd9Sstevel@tonic-gate if (!p->pcf_block) 25947c478bd9Sstevel@tonic-gate freemem += overshoot; 25957c478bd9Sstevel@tonic-gate } 25967c478bd9Sstevel@tonic-gate } 25977c478bd9Sstevel@tonic-gate 25987c478bd9Sstevel@tonic-gate return (plist); 25997c478bd9Sstevel@tonic-gate } 26007c478bd9Sstevel@tonic-gate 26017c478bd9Sstevel@tonic-gate /* 26027c478bd9Sstevel@tonic-gate * One or more constituent pages of this large page has been marked 26037c478bd9Sstevel@tonic-gate * toxic. Simply demote the large page to PAGESIZE pages and let 26047c478bd9Sstevel@tonic-gate * page_free() handle it. This routine should only be called by 26057c478bd9Sstevel@tonic-gate * large page free routines (page_free_pages() and page_destroy_pages(). 26067c478bd9Sstevel@tonic-gate * All pages are locked SE_EXCL and have already been marked free. 26077c478bd9Sstevel@tonic-gate */ 26087c478bd9Sstevel@tonic-gate static void 26097c478bd9Sstevel@tonic-gate page_free_toxic_pages(page_t *rootpp) 26107c478bd9Sstevel@tonic-gate { 26117c478bd9Sstevel@tonic-gate page_t *tpp; 26127c478bd9Sstevel@tonic-gate pgcnt_t i, pgcnt = page_get_pagecnt(rootpp->p_szc); 26137c478bd9Sstevel@tonic-gate uint_t szc = rootpp->p_szc; 26147c478bd9Sstevel@tonic-gate 26157c478bd9Sstevel@tonic-gate for (i = 0, tpp = rootpp; i < pgcnt; i++, tpp = tpp->p_next) { 26167c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 26177c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(tpp) && 26187c478bd9Sstevel@tonic-gate !page_iolock_assert(tpp)) || panicstr); 26197c478bd9Sstevel@tonic-gate tpp->p_szc = 0; 26207c478bd9Sstevel@tonic-gate } 26217c478bd9Sstevel@tonic-gate 26227c478bd9Sstevel@tonic-gate while (rootpp != NULL) { 26237c478bd9Sstevel@tonic-gate tpp = rootpp; 26247c478bd9Sstevel@tonic-gate page_sub(&rootpp, tpp); 26257c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(tpp)); 26267c478bd9Sstevel@tonic-gate PP_CLRFREE(tpp); 26277c478bd9Sstevel@tonic-gate page_free(tpp, 1); 26287c478bd9Sstevel@tonic-gate } 26297c478bd9Sstevel@tonic-gate } 26307c478bd9Sstevel@tonic-gate 26317c478bd9Sstevel@tonic-gate /* 26327c478bd9Sstevel@tonic-gate * Put page on the "free" list. 26337c478bd9Sstevel@tonic-gate * The free list is really two lists maintained by 26347c478bd9Sstevel@tonic-gate * the PSM of whatever machine we happen to be on. 26357c478bd9Sstevel@tonic-gate */ 26367c478bd9Sstevel@tonic-gate void 26377c478bd9Sstevel@tonic-gate page_free(page_t *pp, int dontneed) 26387c478bd9Sstevel@tonic-gate { 26397c478bd9Sstevel@tonic-gate struct pcf *p; 26407c478bd9Sstevel@tonic-gate uint_t pcf_index; 26417c478bd9Sstevel@tonic-gate 26427c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(pp) && 26437c478bd9Sstevel@tonic-gate !page_iolock_assert(pp)) || panicstr); 26447c478bd9Sstevel@tonic-gate 26457c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 26467c478bd9Sstevel@tonic-gate panic("page_free: page %p is free", (void *)pp); 26477c478bd9Sstevel@tonic-gate } 26487c478bd9Sstevel@tonic-gate 26497c478bd9Sstevel@tonic-gate if (pp->p_szc != 0) { 26507c478bd9Sstevel@tonic-gate if (pp->p_vnode == NULL || IS_SWAPFSVP(pp->p_vnode) || 2651ad23a2dbSjohansen PP_ISKAS(pp)) { 26527c478bd9Sstevel@tonic-gate panic("page_free: anon or kernel " 26537c478bd9Sstevel@tonic-gate "or no vnode large page %p", (void *)pp); 26547c478bd9Sstevel@tonic-gate } 26557c478bd9Sstevel@tonic-gate page_demote_vp_pages(pp); 26567c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 26577c478bd9Sstevel@tonic-gate } 26587c478bd9Sstevel@tonic-gate 26597c478bd9Sstevel@tonic-gate /* 26607c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired to examine these 26617c478bd9Sstevel@tonic-gate * fields since the page has an "exclusive" lock. 26627c478bd9Sstevel@tonic-gate */ 266307b65a64Saguzovsk if (hat_page_is_mapped(pp) || pp->p_lckcnt != 0 || pp->p_cowcnt != 0 || 266407b65a64Saguzovsk pp->p_slckcnt != 0) { 266507b65a64Saguzovsk panic("page_free pp=%p, pfn=%lx, lckcnt=%d, cowcnt=%d " 26668793b36bSNick Todd "slckcnt = %d", (void *)pp, page_pptonum(pp), pp->p_lckcnt, 266707b65a64Saguzovsk pp->p_cowcnt, pp->p_slckcnt); 26687c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 26697c478bd9Sstevel@tonic-gate } 26707c478bd9Sstevel@tonic-gate 26717c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(pp)); 26727c478bd9Sstevel@tonic-gate 26737c478bd9Sstevel@tonic-gate PP_SETFREE(pp); 26747c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == NULL || !IS_VMODSORT(pp->p_vnode) || 26757c478bd9Sstevel@tonic-gate !hat_ismod(pp)); 26769d0d62adSJason Beloro page_clr_all_props(pp); 26777c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(pp)); 26787c478bd9Sstevel@tonic-gate 26797c478bd9Sstevel@tonic-gate /* 26807c478bd9Sstevel@tonic-gate * Now we add the page to the head of the free list. 26817c478bd9Sstevel@tonic-gate * But if this page is associated with a paged vnode 26827c478bd9Sstevel@tonic-gate * then we adjust the head forward so that the page is 26837c478bd9Sstevel@tonic-gate * effectively at the end of the list. 26847c478bd9Sstevel@tonic-gate */ 26857c478bd9Sstevel@tonic-gate if (pp->p_vnode == NULL) { 26867c478bd9Sstevel@tonic-gate /* 26877c478bd9Sstevel@tonic-gate * Page has no identity, put it on the free list. 26887c478bd9Sstevel@tonic-gate */ 26897c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 26907c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)-1; 26917c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); 26927c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_free); 26937c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_FREE, 26947c478bd9Sstevel@tonic-gate "page_free_free:pp %p", pp); 26957c478bd9Sstevel@tonic-gate } else { 26967c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 26977c478bd9Sstevel@tonic-gate 26988d4235fbSJosef 'Jeff' Sipek if (!dontneed) { 26997c478bd9Sstevel@tonic-gate /* move it to the tail of the list */ 27007c478bd9Sstevel@tonic-gate page_list_add(pp, PG_CACHE_LIST | PG_LIST_TAIL); 27017c478bd9Sstevel@tonic-gate 27027c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_cache); 27037c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_CACHE_TAIL, 27047c478bd9Sstevel@tonic-gate "page_free_cache_tail:pp %p", pp); 27057c478bd9Sstevel@tonic-gate } else { 27067c478bd9Sstevel@tonic-gate page_list_add(pp, PG_CACHE_LIST | PG_LIST_HEAD); 27077c478bd9Sstevel@tonic-gate 27087c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_dontneed); 27097c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_CACHE_HEAD, 27107c478bd9Sstevel@tonic-gate "page_free_cache_head:pp %p", pp); 27117c478bd9Sstevel@tonic-gate } 27127c478bd9Sstevel@tonic-gate } 27137c478bd9Sstevel@tonic-gate page_unlock(pp); 27147c478bd9Sstevel@tonic-gate 27157c478bd9Sstevel@tonic-gate /* 27167c478bd9Sstevel@tonic-gate * Now do the `freemem' accounting. 27177c478bd9Sstevel@tonic-gate */ 27187c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 27197c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 27207c478bd9Sstevel@tonic-gate 27217c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 27227c478bd9Sstevel@tonic-gate if (p->pcf_block) { 27237c478bd9Sstevel@tonic-gate p->pcf_reserve += 1; 27247c478bd9Sstevel@tonic-gate } else { 27257c478bd9Sstevel@tonic-gate p->pcf_count += 1; 27267c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 27277c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 27287c478bd9Sstevel@tonic-gate /* 27297c478bd9Sstevel@tonic-gate * Check to see if some other thread 27307c478bd9Sstevel@tonic-gate * is actually waiting. Another bucket 27317c478bd9Sstevel@tonic-gate * may have woken it up by now. If there 27327c478bd9Sstevel@tonic-gate * are no waiters, then set our pcf_wait 27337c478bd9Sstevel@tonic-gate * count to zero to avoid coming in here 27347c478bd9Sstevel@tonic-gate * next time. Also, since only one page 27357c478bd9Sstevel@tonic-gate * was put on the free list, just wake 27367c478bd9Sstevel@tonic-gate * up one waiter. 27377c478bd9Sstevel@tonic-gate */ 27387c478bd9Sstevel@tonic-gate if (freemem_wait) { 27397c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 27407c478bd9Sstevel@tonic-gate p->pcf_wait--; 27417c478bd9Sstevel@tonic-gate } else { 27427c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 27437c478bd9Sstevel@tonic-gate } 27447c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 27457c478bd9Sstevel@tonic-gate } 27467c478bd9Sstevel@tonic-gate } 27477c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 27487c478bd9Sstevel@tonic-gate 27497c478bd9Sstevel@tonic-gate /* freemem is approximate, so this test OK */ 27507c478bd9Sstevel@tonic-gate if (!p->pcf_block) 27517c478bd9Sstevel@tonic-gate freemem += 1; 27527c478bd9Sstevel@tonic-gate } 27537c478bd9Sstevel@tonic-gate 27547c478bd9Sstevel@tonic-gate /* 27557c478bd9Sstevel@tonic-gate * Put page on the "free" list during intial startup. 27567c478bd9Sstevel@tonic-gate * This happens during initial single threaded execution. 27577c478bd9Sstevel@tonic-gate */ 27587c478bd9Sstevel@tonic-gate void 27597c478bd9Sstevel@tonic-gate page_free_at_startup(page_t *pp) 27607c478bd9Sstevel@tonic-gate { 27617c478bd9Sstevel@tonic-gate struct pcf *p; 27627c478bd9Sstevel@tonic-gate uint_t pcf_index; 27637c478bd9Sstevel@tonic-gate 27647c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_HEAD | PG_LIST_ISINIT); 27657c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_free); 27667c478bd9Sstevel@tonic-gate 27677c478bd9Sstevel@tonic-gate /* 27687c478bd9Sstevel@tonic-gate * Now do the `freemem' accounting. 27697c478bd9Sstevel@tonic-gate */ 27707c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 27717c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 27727c478bd9Sstevel@tonic-gate 27737c478bd9Sstevel@tonic-gate ASSERT(p->pcf_block == 0); 27747c478bd9Sstevel@tonic-gate ASSERT(p->pcf_wait == 0); 27757c478bd9Sstevel@tonic-gate p->pcf_count += 1; 27767c478bd9Sstevel@tonic-gate 27777c478bd9Sstevel@tonic-gate /* freemem is approximate, so this is OK */ 27787c478bd9Sstevel@tonic-gate freemem += 1; 27797c478bd9Sstevel@tonic-gate } 27807c478bd9Sstevel@tonic-gate 27817c478bd9Sstevel@tonic-gate void 27827c478bd9Sstevel@tonic-gate page_free_pages(page_t *pp) 27837c478bd9Sstevel@tonic-gate { 27847c478bd9Sstevel@tonic-gate page_t *tpp, *rootpp = NULL; 27857c478bd9Sstevel@tonic-gate pgcnt_t pgcnt = page_get_pagecnt(pp->p_szc); 27867c478bd9Sstevel@tonic-gate pgcnt_t i; 27877c478bd9Sstevel@tonic-gate uint_t szc = pp->p_szc; 27887c478bd9Sstevel@tonic-gate 27897c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_pages); 27907c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_FREE, 27917c478bd9Sstevel@tonic-gate "page_free_free:pp %p", pp); 27927c478bd9Sstevel@tonic-gate 27937c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc != 0 && pp->p_szc < page_num_pagesizes()); 27947c478bd9Sstevel@tonic-gate if ((page_pptonum(pp) & (pgcnt - 1)) != 0) { 27957c478bd9Sstevel@tonic-gate panic("page_free_pages: not root page %p", (void *)pp); 27967c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 27977c478bd9Sstevel@tonic-gate } 27987c478bd9Sstevel@tonic-gate 2799affbd3ccSkchow for (i = 0, tpp = pp; i < pgcnt; i++, tpp++) { 28007c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(tpp) && 28017c478bd9Sstevel@tonic-gate !page_iolock_assert(tpp)) || panicstr); 28027c478bd9Sstevel@tonic-gate if (PP_ISFREE(tpp)) { 28037c478bd9Sstevel@tonic-gate panic("page_free_pages: page %p is free", (void *)tpp); 28047c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 28057c478bd9Sstevel@tonic-gate } 28067c478bd9Sstevel@tonic-gate if (hat_page_is_mapped(tpp) || tpp->p_lckcnt != 0 || 280707b65a64Saguzovsk tpp->p_cowcnt != 0 || tpp->p_slckcnt != 0) { 28087c478bd9Sstevel@tonic-gate panic("page_free_pages %p", (void *)tpp); 28097c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 28107c478bd9Sstevel@tonic-gate } 28117c478bd9Sstevel@tonic-gate 28127c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(tpp)); 28137c478bd9Sstevel@tonic-gate ASSERT(tpp->p_vnode == NULL); 28147c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 28157c478bd9Sstevel@tonic-gate 28167c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 28179d0d62adSJason Beloro page_clr_all_props(tpp); 28187c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 28197c478bd9Sstevel@tonic-gate tpp->p_offset = (u_offset_t)-1; 28207c478bd9Sstevel@tonic-gate ASSERT(tpp->p_next == tpp); 28217c478bd9Sstevel@tonic-gate ASSERT(tpp->p_prev == tpp); 28227c478bd9Sstevel@tonic-gate page_list_concat(&rootpp, &tpp); 28237c478bd9Sstevel@tonic-gate } 28247c478bd9Sstevel@tonic-gate ASSERT(rootpp == pp); 28257c478bd9Sstevel@tonic-gate 28267c478bd9Sstevel@tonic-gate page_list_add_pages(rootpp, 0); 28277c478bd9Sstevel@tonic-gate page_create_putback(pgcnt); 28287c478bd9Sstevel@tonic-gate } 28297c478bd9Sstevel@tonic-gate 28307c478bd9Sstevel@tonic-gate int free_pages = 1; 28317c478bd9Sstevel@tonic-gate 28327c478bd9Sstevel@tonic-gate /* 28337c478bd9Sstevel@tonic-gate * This routine attempts to return pages to the cachelist via page_release(). 28347c478bd9Sstevel@tonic-gate * It does not *have* to be successful in all cases, since the pageout scanner 28357c478bd9Sstevel@tonic-gate * will catch any pages it misses. It does need to be fast and not introduce 28367c478bd9Sstevel@tonic-gate * too much overhead. 28377c478bd9Sstevel@tonic-gate * 28387c478bd9Sstevel@tonic-gate * If a page isn't found on the unlocked sweep of the page_hash bucket, we 28397c478bd9Sstevel@tonic-gate * don't lock and retry. This is ok, since the page scanner will eventually 28407c478bd9Sstevel@tonic-gate * find any page we miss in free_vp_pages(). 28417c478bd9Sstevel@tonic-gate */ 28427c478bd9Sstevel@tonic-gate void 28437c478bd9Sstevel@tonic-gate free_vp_pages(vnode_t *vp, u_offset_t off, size_t len) 28447c478bd9Sstevel@tonic-gate { 28457c478bd9Sstevel@tonic-gate page_t *pp; 28467c478bd9Sstevel@tonic-gate u_offset_t eoff; 28477c478bd9Sstevel@tonic-gate extern int swap_in_range(vnode_t *, u_offset_t, size_t); 28487c478bd9Sstevel@tonic-gate 28497c478bd9Sstevel@tonic-gate eoff = off + len; 28507c478bd9Sstevel@tonic-gate 28517c478bd9Sstevel@tonic-gate if (free_pages == 0) 28527c478bd9Sstevel@tonic-gate return; 28537c478bd9Sstevel@tonic-gate if (swap_in_range(vp, off, len)) 28547c478bd9Sstevel@tonic-gate return; 28557c478bd9Sstevel@tonic-gate 28567c478bd9Sstevel@tonic-gate for (; off < eoff; off += PAGESIZE) { 28577c478bd9Sstevel@tonic-gate 28587c478bd9Sstevel@tonic-gate /* 28597c478bd9Sstevel@tonic-gate * find the page using a fast, but inexact search. It'll be OK 28607c478bd9Sstevel@tonic-gate * if a few pages slip through the cracks here. 28617c478bd9Sstevel@tonic-gate */ 28627c478bd9Sstevel@tonic-gate pp = page_exists(vp, off); 28637c478bd9Sstevel@tonic-gate 28647c478bd9Sstevel@tonic-gate /* 28657c478bd9Sstevel@tonic-gate * If we didn't find the page (it may not exist), the page 28667c478bd9Sstevel@tonic-gate * is free, looks still in use (shared), or we can't lock it, 28677c478bd9Sstevel@tonic-gate * just give up. 28687c478bd9Sstevel@tonic-gate */ 28697c478bd9Sstevel@tonic-gate if (pp == NULL || 28707c478bd9Sstevel@tonic-gate PP_ISFREE(pp) || 28717c478bd9Sstevel@tonic-gate page_share_cnt(pp) > 0 || 28727c478bd9Sstevel@tonic-gate !page_trylock(pp, SE_EXCL)) 28737c478bd9Sstevel@tonic-gate continue; 28747c478bd9Sstevel@tonic-gate 28757c478bd9Sstevel@tonic-gate /* 28767c478bd9Sstevel@tonic-gate * Once we have locked pp, verify that it's still the 28777c478bd9Sstevel@tonic-gate * correct page and not already free 28787c478bd9Sstevel@tonic-gate */ 28797c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED_SE(pp, SE_EXCL)); 28807c478bd9Sstevel@tonic-gate if (pp->p_vnode != vp || pp->p_offset != off || PP_ISFREE(pp)) { 28817c478bd9Sstevel@tonic-gate page_unlock(pp); 28827c478bd9Sstevel@tonic-gate continue; 28837c478bd9Sstevel@tonic-gate } 28847c478bd9Sstevel@tonic-gate 28857c478bd9Sstevel@tonic-gate /* 28867c478bd9Sstevel@tonic-gate * try to release the page... 28877c478bd9Sstevel@tonic-gate */ 28887c478bd9Sstevel@tonic-gate (void) page_release(pp, 1); 28897c478bd9Sstevel@tonic-gate } 28907c478bd9Sstevel@tonic-gate } 28917c478bd9Sstevel@tonic-gate 28927c478bd9Sstevel@tonic-gate /* 28937c478bd9Sstevel@tonic-gate * Reclaim the given page from the free list. 28946e4dd838Smec * If pp is part of a large pages, only the given constituent page is reclaimed 28956e4dd838Smec * and the large page it belonged to will be demoted. This can only happen 28966e4dd838Smec * if the page is not on the cachelist. 28976e4dd838Smec * 28987c478bd9Sstevel@tonic-gate * Returns 1 on success or 0 on failure. 28997c478bd9Sstevel@tonic-gate * 29007c478bd9Sstevel@tonic-gate * The page is unlocked if it can't be reclaimed (when freemem == 0). 29017c478bd9Sstevel@tonic-gate * If `lock' is non-null, it will be dropped and re-acquired if 29027c478bd9Sstevel@tonic-gate * the routine must wait while freemem is 0. 29037c478bd9Sstevel@tonic-gate * 29047c478bd9Sstevel@tonic-gate * As it turns out, boot_getpages() does this. It picks a page, 29057c478bd9Sstevel@tonic-gate * based on where OBP mapped in some address, gets its pfn, searches 29067c478bd9Sstevel@tonic-gate * the memsegs, locks the page, then pulls it off the free list! 29077c478bd9Sstevel@tonic-gate */ 29087c478bd9Sstevel@tonic-gate int 29097c478bd9Sstevel@tonic-gate page_reclaim(page_t *pp, kmutex_t *lock) 29107c478bd9Sstevel@tonic-gate { 29117c478bd9Sstevel@tonic-gate struct pcf *p; 29127c478bd9Sstevel@tonic-gate struct cpu *cpup; 29136e4dd838Smec int enough; 29147c478bd9Sstevel@tonic-gate uint_t i; 29157c478bd9Sstevel@tonic-gate 29167c478bd9Sstevel@tonic-gate ASSERT(lock != NULL ? MUTEX_HELD(lock) : 1); 29177c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp) && PP_ISFREE(pp)); 2918db874c57Selowe 29197c478bd9Sstevel@tonic-gate /* 29207c478bd9Sstevel@tonic-gate * If `freemem' is 0, we cannot reclaim this page from the 29217c478bd9Sstevel@tonic-gate * freelist, so release every lock we might hold: the page, 29227c478bd9Sstevel@tonic-gate * and the `lock' before blocking. 29237c478bd9Sstevel@tonic-gate * 29247c478bd9Sstevel@tonic-gate * The only way `freemem' can become 0 while there are pages 29257c478bd9Sstevel@tonic-gate * marked free (have their p->p_free bit set) is when the 29267c478bd9Sstevel@tonic-gate * system is low on memory and doing a page_create(). In 29277c478bd9Sstevel@tonic-gate * order to guarantee that once page_create() starts acquiring 29287c478bd9Sstevel@tonic-gate * pages it will be able to get all that it needs since `freemem' 29297c478bd9Sstevel@tonic-gate * was decreased by the requested amount. So, we need to release 29307c478bd9Sstevel@tonic-gate * this page, and let page_create() have it. 29317c478bd9Sstevel@tonic-gate * 29327c478bd9Sstevel@tonic-gate * Since `freemem' being zero is not supposed to happen, just 29337c478bd9Sstevel@tonic-gate * use the usual hash stuff as a starting point. If that bucket 29347c478bd9Sstevel@tonic-gate * is empty, then assume the worst, and start at the beginning 29357c478bd9Sstevel@tonic-gate * of the pcf array. If we always start at the beginning 29367c478bd9Sstevel@tonic-gate * when acquiring more than one pcf lock, there won't be any 29377c478bd9Sstevel@tonic-gate * deadlock problems. 29387c478bd9Sstevel@tonic-gate */ 29397c478bd9Sstevel@tonic-gate 29407c478bd9Sstevel@tonic-gate /* TODO: Do we need to test kcage_freemem if PG_NORELOC(pp)? */ 29417c478bd9Sstevel@tonic-gate 29426e4dd838Smec if (freemem <= throttlefree && !page_create_throttle(1l, 0)) { 29437c478bd9Sstevel@tonic-gate pcf_acquire_all(); 29447c478bd9Sstevel@tonic-gate goto page_reclaim_nomem; 29457c478bd9Sstevel@tonic-gate } 29467c478bd9Sstevel@tonic-gate 294706fb6a36Sdv enough = pcf_decrement_bucket(1); 29487c478bd9Sstevel@tonic-gate 29496e4dd838Smec if (!enough) { 29507c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_reclaim_zero); 29517c478bd9Sstevel@tonic-gate /* 29527c478bd9Sstevel@tonic-gate * Check again. Its possible that some other thread 29537c478bd9Sstevel@tonic-gate * could have been right behind us, and added one 29547c478bd9Sstevel@tonic-gate * to a list somewhere. Acquire each of the pcf locks 29557c478bd9Sstevel@tonic-gate * until we find a page. 29567c478bd9Sstevel@tonic-gate */ 29577c478bd9Sstevel@tonic-gate p = pcf; 295806fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 29597c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 29606e4dd838Smec if (p->pcf_count >= 1) { 29616e4dd838Smec p->pcf_count -= 1; 29625797d5ddSDavid Valin /* 29635797d5ddSDavid Valin * freemem is not protected by any lock. Thus, 29645797d5ddSDavid Valin * we cannot have any assertion containing 29655797d5ddSDavid Valin * freemem here. 29665797d5ddSDavid Valin */ 29675797d5ddSDavid Valin freemem -= 1; 29686e4dd838Smec enough = 1; 29696e4dd838Smec break; 29707c478bd9Sstevel@tonic-gate } 29717c478bd9Sstevel@tonic-gate p++; 29727c478bd9Sstevel@tonic-gate } 29737c478bd9Sstevel@tonic-gate 29746e4dd838Smec if (!enough) { 29757c478bd9Sstevel@tonic-gate page_reclaim_nomem: 29767c478bd9Sstevel@tonic-gate /* 29777c478bd9Sstevel@tonic-gate * We really can't have page `pp'. 29787c478bd9Sstevel@tonic-gate * Time for the no-memory dance with 29797c478bd9Sstevel@tonic-gate * page_free(). This is just like 29807c478bd9Sstevel@tonic-gate * page_create_wait(). Plus the added 29817c478bd9Sstevel@tonic-gate * attraction of releasing whatever mutex 29827c478bd9Sstevel@tonic-gate * we held when we were called with in `lock'. 29837c478bd9Sstevel@tonic-gate * Page_unlock() will wakeup any thread 29847c478bd9Sstevel@tonic-gate * waiting around for this page. 29857c478bd9Sstevel@tonic-gate */ 29867c478bd9Sstevel@tonic-gate if (lock) { 29877c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_reclaim_zero_locked); 29887c478bd9Sstevel@tonic-gate mutex_exit(lock); 29897c478bd9Sstevel@tonic-gate } 29907c478bd9Sstevel@tonic-gate page_unlock(pp); 29917c478bd9Sstevel@tonic-gate 29927c478bd9Sstevel@tonic-gate /* 29937c478bd9Sstevel@tonic-gate * get this before we drop all the pcf locks. 29947c478bd9Sstevel@tonic-gate */ 29957c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 29967c478bd9Sstevel@tonic-gate 29977c478bd9Sstevel@tonic-gate p = pcf; 299806fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 29997c478bd9Sstevel@tonic-gate p->pcf_wait++; 30007c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 30017c478bd9Sstevel@tonic-gate p++; 30027c478bd9Sstevel@tonic-gate } 30037c478bd9Sstevel@tonic-gate 30047c478bd9Sstevel@tonic-gate freemem_wait++; 30057c478bd9Sstevel@tonic-gate cv_wait(&freemem_cv, &new_freemem_lock); 30067c478bd9Sstevel@tonic-gate freemem_wait--; 30077c478bd9Sstevel@tonic-gate 30087c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 30097c478bd9Sstevel@tonic-gate 30107c478bd9Sstevel@tonic-gate if (lock) { 30117c478bd9Sstevel@tonic-gate mutex_enter(lock); 30127c478bd9Sstevel@tonic-gate } 30137c478bd9Sstevel@tonic-gate return (0); 30147c478bd9Sstevel@tonic-gate } 30157c478bd9Sstevel@tonic-gate 30167c478bd9Sstevel@tonic-gate /* 30177c478bd9Sstevel@tonic-gate * The pcf accounting has been done, 30187c478bd9Sstevel@tonic-gate * though none of the pcf_wait flags have been set, 30197c478bd9Sstevel@tonic-gate * drop the locks and continue on. 30207c478bd9Sstevel@tonic-gate */ 30217c478bd9Sstevel@tonic-gate while (p >= pcf) { 30227c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 30237c478bd9Sstevel@tonic-gate p--; 30247c478bd9Sstevel@tonic-gate } 30257c478bd9Sstevel@tonic-gate } 30267c478bd9Sstevel@tonic-gate 30277c478bd9Sstevel@tonic-gate 30287c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_reclaim); 30296e4dd838Smec 30306e4dd838Smec /* 30316e4dd838Smec * page_list_sub will handle the case where pp is a large page. 30326e4dd838Smec * It's possible that the page was promoted while on the freelist 30336e4dd838Smec */ 30347c478bd9Sstevel@tonic-gate if (PP_ISAGED(pp)) { 30356e4dd838Smec page_list_sub(pp, PG_FREE_LIST); 30367c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_UNFREE_FREE, 30377c478bd9Sstevel@tonic-gate "page_reclaim_free:pp %p", pp); 30387c478bd9Sstevel@tonic-gate } else { 30397c478bd9Sstevel@tonic-gate page_list_sub(pp, PG_CACHE_LIST); 30407c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_UNFREE_CACHE, 30417c478bd9Sstevel@tonic-gate "page_reclaim_cache:pp %p", pp); 30427c478bd9Sstevel@tonic-gate } 30437c478bd9Sstevel@tonic-gate 30447c478bd9Sstevel@tonic-gate /* 30457c478bd9Sstevel@tonic-gate * clear the p_free & p_age bits since this page is no longer 30467c478bd9Sstevel@tonic-gate * on the free list. Notice that there was a brief time where 30477c478bd9Sstevel@tonic-gate * a page is marked as free, but is not on the list. 30487c478bd9Sstevel@tonic-gate * 30497c478bd9Sstevel@tonic-gate * Set the reference bit to protect against immediate pageout. 30507c478bd9Sstevel@tonic-gate */ 30516e4dd838Smec PP_CLRFREE(pp); 30526e4dd838Smec PP_CLRAGED(pp); 30536e4dd838Smec page_set_props(pp, P_REF); 30547c478bd9Sstevel@tonic-gate 30557c478bd9Sstevel@tonic-gate CPU_STATS_ENTER_K(); 30567c478bd9Sstevel@tonic-gate cpup = CPU; /* get cpup now that CPU cannot change */ 30577c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cpup, vm, pgrec, 1); 30587c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cpup, vm, pgfrec, 1); 30597c478bd9Sstevel@tonic-gate CPU_STATS_EXIT_K(); 30606e4dd838Smec ASSERT(pp->p_szc == 0); 30617c478bd9Sstevel@tonic-gate 30627c478bd9Sstevel@tonic-gate return (1); 30637c478bd9Sstevel@tonic-gate } 30647c478bd9Sstevel@tonic-gate 30657c478bd9Sstevel@tonic-gate /* 30667c478bd9Sstevel@tonic-gate * Destroy identity of the page and put it back on 30677c478bd9Sstevel@tonic-gate * the page free list. Assumes that the caller has 30687c478bd9Sstevel@tonic-gate * acquired the "exclusive" lock on the page. 30697c478bd9Sstevel@tonic-gate */ 30707c478bd9Sstevel@tonic-gate void 30717c478bd9Sstevel@tonic-gate page_destroy(page_t *pp, int dontfree) 30727c478bd9Sstevel@tonic-gate { 30737c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(pp) && 30747c478bd9Sstevel@tonic-gate !page_iolock_assert(pp)) || panicstr); 307507b65a64Saguzovsk ASSERT(pp->p_slckcnt == 0 || panicstr); 30767c478bd9Sstevel@tonic-gate 30777c478bd9Sstevel@tonic-gate if (pp->p_szc != 0) { 30787c478bd9Sstevel@tonic-gate if (pp->p_vnode == NULL || IS_SWAPFSVP(pp->p_vnode) || 3079ad23a2dbSjohansen PP_ISKAS(pp)) { 30807c478bd9Sstevel@tonic-gate panic("page_destroy: anon or kernel or no vnode " 30817c478bd9Sstevel@tonic-gate "large page %p", (void *)pp); 30827c478bd9Sstevel@tonic-gate } 30837c478bd9Sstevel@tonic-gate page_demote_vp_pages(pp); 30847c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 30857c478bd9Sstevel@tonic-gate } 30867c478bd9Sstevel@tonic-gate 30877c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_DESTROY, "page_destroy:pp %p", pp); 30887c478bd9Sstevel@tonic-gate 30897c478bd9Sstevel@tonic-gate /* 30907c478bd9Sstevel@tonic-gate * Unload translations, if any, then hash out the 30917c478bd9Sstevel@tonic-gate * page to erase its identity. 30927c478bd9Sstevel@tonic-gate */ 30937c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 30947c478bd9Sstevel@tonic-gate page_hashout(pp, NULL); 30957c478bd9Sstevel@tonic-gate 30967c478bd9Sstevel@tonic-gate if (!dontfree) { 30977c478bd9Sstevel@tonic-gate /* 30987c478bd9Sstevel@tonic-gate * Acquire the "freemem_lock" for availrmem. 30997c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt 31007c478bd9Sstevel@tonic-gate * and cowcnt since the page has an "exclusive" lock. 3101552507c5SGangadhar Mylapuram * We are doing a modified version of page_pp_unlock here. 31027c478bd9Sstevel@tonic-gate */ 31037c478bd9Sstevel@tonic-gate if ((pp->p_lckcnt != 0) || (pp->p_cowcnt != 0)) { 31047c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 31057c478bd9Sstevel@tonic-gate if (pp->p_lckcnt != 0) { 31067c478bd9Sstevel@tonic-gate availrmem++; 3107552507c5SGangadhar Mylapuram pages_locked--; 31087c478bd9Sstevel@tonic-gate pp->p_lckcnt = 0; 31097c478bd9Sstevel@tonic-gate } 31107c478bd9Sstevel@tonic-gate if (pp->p_cowcnt != 0) { 31117c478bd9Sstevel@tonic-gate availrmem += pp->p_cowcnt; 3112552507c5SGangadhar Mylapuram pages_locked -= pp->p_cowcnt; 31137c478bd9Sstevel@tonic-gate pp->p_cowcnt = 0; 31147c478bd9Sstevel@tonic-gate } 31157c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 31167c478bd9Sstevel@tonic-gate } 31177c478bd9Sstevel@tonic-gate /* 31187c478bd9Sstevel@tonic-gate * Put the page on the "free" list. 31197c478bd9Sstevel@tonic-gate */ 31207c478bd9Sstevel@tonic-gate page_free(pp, 0); 31217c478bd9Sstevel@tonic-gate } 31227c478bd9Sstevel@tonic-gate } 31237c478bd9Sstevel@tonic-gate 31247c478bd9Sstevel@tonic-gate void 31257c478bd9Sstevel@tonic-gate page_destroy_pages(page_t *pp) 31267c478bd9Sstevel@tonic-gate { 31277c478bd9Sstevel@tonic-gate 31287c478bd9Sstevel@tonic-gate page_t *tpp, *rootpp = NULL; 31297c478bd9Sstevel@tonic-gate pgcnt_t pgcnt = page_get_pagecnt(pp->p_szc); 31307c478bd9Sstevel@tonic-gate pgcnt_t i, pglcks = 0; 31317c478bd9Sstevel@tonic-gate uint_t szc = pp->p_szc; 31327c478bd9Sstevel@tonic-gate 31337c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc != 0 && pp->p_szc < page_num_pagesizes()); 31347c478bd9Sstevel@tonic-gate 31357c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_destroy_pages); 31367c478bd9Sstevel@tonic-gate 31377c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_DESTROY, "page_destroy_pages:pp %p", pp); 31387c478bd9Sstevel@tonic-gate 31397c478bd9Sstevel@tonic-gate if ((page_pptonum(pp) & (pgcnt - 1)) != 0) { 31407c478bd9Sstevel@tonic-gate panic("page_destroy_pages: not root page %p", (void *)pp); 31417c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 31427c478bd9Sstevel@tonic-gate } 31437c478bd9Sstevel@tonic-gate 3144affbd3ccSkchow for (i = 0, tpp = pp; i < pgcnt; i++, tpp++) { 31457c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(tpp) && 31467c478bd9Sstevel@tonic-gate !page_iolock_assert(tpp)) || panicstr); 314707b65a64Saguzovsk ASSERT(tpp->p_slckcnt == 0 || panicstr); 31487c478bd9Sstevel@tonic-gate (void) hat_pageunload(tpp, HAT_FORCE_PGUNLOAD); 31497c478bd9Sstevel@tonic-gate page_hashout(tpp, NULL); 31507c478bd9Sstevel@tonic-gate ASSERT(tpp->p_offset == (u_offset_t)-1); 31517c478bd9Sstevel@tonic-gate if (tpp->p_lckcnt != 0) { 31527c478bd9Sstevel@tonic-gate pglcks++; 31537c478bd9Sstevel@tonic-gate tpp->p_lckcnt = 0; 31547c478bd9Sstevel@tonic-gate } else if (tpp->p_cowcnt != 0) { 31557c478bd9Sstevel@tonic-gate pglcks += tpp->p_cowcnt; 31567c478bd9Sstevel@tonic-gate tpp->p_cowcnt = 0; 31577c478bd9Sstevel@tonic-gate } 31587c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(tpp)); 31597c478bd9Sstevel@tonic-gate ASSERT(tpp->p_vnode == NULL); 31607c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 31617c478bd9Sstevel@tonic-gate 31627c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 31639d0d62adSJason Beloro page_clr_all_props(tpp); 31647c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 31657c478bd9Sstevel@tonic-gate ASSERT(tpp->p_next == tpp); 31667c478bd9Sstevel@tonic-gate ASSERT(tpp->p_prev == tpp); 31677c478bd9Sstevel@tonic-gate page_list_concat(&rootpp, &tpp); 31687c478bd9Sstevel@tonic-gate } 31697c478bd9Sstevel@tonic-gate 31707c478bd9Sstevel@tonic-gate ASSERT(rootpp == pp); 31717c478bd9Sstevel@tonic-gate if (pglcks != 0) { 31727c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 31737c478bd9Sstevel@tonic-gate availrmem += pglcks; 31747c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 31757c478bd9Sstevel@tonic-gate } 31767c478bd9Sstevel@tonic-gate 31777c478bd9Sstevel@tonic-gate page_list_add_pages(rootpp, 0); 31787c478bd9Sstevel@tonic-gate page_create_putback(pgcnt); 31797c478bd9Sstevel@tonic-gate } 31807c478bd9Sstevel@tonic-gate 31817c478bd9Sstevel@tonic-gate /* 31827c478bd9Sstevel@tonic-gate * Similar to page_destroy(), but destroys pages which are 31837c478bd9Sstevel@tonic-gate * locked and known to be on the page free list. Since 31847c478bd9Sstevel@tonic-gate * the page is known to be free and locked, no one can access 31857c478bd9Sstevel@tonic-gate * it. 31867c478bd9Sstevel@tonic-gate * 31877c478bd9Sstevel@tonic-gate * Also, the number of free pages does not change. 31887c478bd9Sstevel@tonic-gate */ 31897c478bd9Sstevel@tonic-gate void 31907c478bd9Sstevel@tonic-gate page_destroy_free(page_t *pp) 31917c478bd9Sstevel@tonic-gate { 31927c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 31937c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(pp)); 31947c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode); 31957c478bd9Sstevel@tonic-gate ASSERT(hat_page_getattr(pp, P_MOD | P_REF | P_RO) == 0); 31967c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 31977c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp) == 0); 31987c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 31997c478bd9Sstevel@tonic-gate 32007c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_destroy_free); 32017c478bd9Sstevel@tonic-gate page_list_sub(pp, PG_CACHE_LIST); 32027c478bd9Sstevel@tonic-gate 32037c478bd9Sstevel@tonic-gate page_hashout(pp, NULL); 32047c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == NULL); 32057c478bd9Sstevel@tonic-gate ASSERT(pp->p_offset == (u_offset_t)-1); 32067c478bd9Sstevel@tonic-gate ASSERT(pp->p_hash == NULL); 32077c478bd9Sstevel@tonic-gate 32087c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 32097c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); 32107c478bd9Sstevel@tonic-gate page_unlock(pp); 32117c478bd9Sstevel@tonic-gate 32127c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 32137c478bd9Sstevel@tonic-gate if (freemem_wait) { 32147c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 32157c478bd9Sstevel@tonic-gate } 32167c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 32177c478bd9Sstevel@tonic-gate } 32187c478bd9Sstevel@tonic-gate 32197c478bd9Sstevel@tonic-gate /* 32207c478bd9Sstevel@tonic-gate * Rename the page "opp" to have an identity specified 32217c478bd9Sstevel@tonic-gate * by [vp, off]. If a page already exists with this name 32227c478bd9Sstevel@tonic-gate * it is locked and destroyed. Note that the page's 32237c478bd9Sstevel@tonic-gate * translations are not unloaded during the rename. 32247c478bd9Sstevel@tonic-gate * 32257c478bd9Sstevel@tonic-gate * This routine is used by the anon layer to "steal" the 32267c478bd9Sstevel@tonic-gate * original page and is not unlike destroying a page and 32277c478bd9Sstevel@tonic-gate * creating a new page using the same page frame. 32287c478bd9Sstevel@tonic-gate * 32297c478bd9Sstevel@tonic-gate * XXX -- Could deadlock if caller 1 tries to rename A to B while 32307c478bd9Sstevel@tonic-gate * caller 2 tries to rename B to A. 32317c478bd9Sstevel@tonic-gate */ 32327c478bd9Sstevel@tonic-gate void 32337c478bd9Sstevel@tonic-gate page_rename(page_t *opp, vnode_t *vp, u_offset_t off) 32347c478bd9Sstevel@tonic-gate { 32357c478bd9Sstevel@tonic-gate page_t *pp; 32367c478bd9Sstevel@tonic-gate int olckcnt = 0; 32377c478bd9Sstevel@tonic-gate int ocowcnt = 0; 32387c478bd9Sstevel@tonic-gate kmutex_t *phm; 32397c478bd9Sstevel@tonic-gate ulong_t index; 32407c478bd9Sstevel@tonic-gate 32417c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(opp) && !page_iolock_assert(opp)); 32427c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 32437c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(opp) == 0); 32447c478bd9Sstevel@tonic-gate 32457c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_rename_count); 32467c478bd9Sstevel@tonic-gate 32477c478bd9Sstevel@tonic-gate TRACE_3(TR_FAC_VM, TR_PAGE_RENAME, 32486e4dd838Smec "page rename:pp %p vp %p off %llx", opp, vp, off); 32497c478bd9Sstevel@tonic-gate 325037fbc076Saguzovsk /* 325137fbc076Saguzovsk * CacheFS may call page_rename for a large NFS page 325237fbc076Saguzovsk * when both CacheFS and NFS mount points are used 325337fbc076Saguzovsk * by applications. Demote this large page before 325437fbc076Saguzovsk * renaming it, to ensure that there are no "partial" 325537fbc076Saguzovsk * large pages left lying around. 325637fbc076Saguzovsk */ 325737fbc076Saguzovsk if (opp->p_szc != 0) { 325837fbc076Saguzovsk vnode_t *ovp = opp->p_vnode; 325937fbc076Saguzovsk ASSERT(ovp != NULL); 326037fbc076Saguzovsk ASSERT(!IS_SWAPFSVP(ovp)); 3261ad23a2dbSjohansen ASSERT(!VN_ISKAS(ovp)); 326237fbc076Saguzovsk page_demote_vp_pages(opp); 326337fbc076Saguzovsk ASSERT(opp->p_szc == 0); 326437fbc076Saguzovsk } 326537fbc076Saguzovsk 32667c478bd9Sstevel@tonic-gate page_hashout(opp, NULL); 32677c478bd9Sstevel@tonic-gate PP_CLRAGED(opp); 32687c478bd9Sstevel@tonic-gate 32697c478bd9Sstevel@tonic-gate /* 32707c478bd9Sstevel@tonic-gate * Acquire the appropriate page hash lock, since 32717c478bd9Sstevel@tonic-gate * we're going to rename the page. 32727c478bd9Sstevel@tonic-gate */ 32737c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 32747c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 32757c478bd9Sstevel@tonic-gate mutex_enter(phm); 32767c478bd9Sstevel@tonic-gate top: 32777c478bd9Sstevel@tonic-gate /* 32787c478bd9Sstevel@tonic-gate * Look for an existing page with this name and destroy it if found. 32797c478bd9Sstevel@tonic-gate * By holding the page hash lock all the way to the page_hashin() 32807c478bd9Sstevel@tonic-gate * call, we are assured that no page can be created with this 32817c478bd9Sstevel@tonic-gate * identity. In the case when the phm lock is dropped to undo any 32827c478bd9Sstevel@tonic-gate * hat layer mappings, the existing page is held with an "exclusive" 32837c478bd9Sstevel@tonic-gate * lock, again preventing another page from being created with 32847c478bd9Sstevel@tonic-gate * this identity. 32857c478bd9Sstevel@tonic-gate */ 3286e7c874afSJosef 'Jeff' Sipek pp = page_hash_search(index, vp, off); 32877c478bd9Sstevel@tonic-gate if (pp != NULL) { 32887c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_rename_exists); 32897c478bd9Sstevel@tonic-gate 32907c478bd9Sstevel@tonic-gate /* 32917c478bd9Sstevel@tonic-gate * As it turns out, this is one of only two places where 32927c478bd9Sstevel@tonic-gate * page_lock() needs to hold the passed in lock in the 32937c478bd9Sstevel@tonic-gate * successful case. In all of the others, the lock could 32947c478bd9Sstevel@tonic-gate * be dropped as soon as the attempt is made to lock 32957c478bd9Sstevel@tonic-gate * the page. It is tempting to add yet another arguement, 32967c478bd9Sstevel@tonic-gate * PL_KEEP or PL_DROP, to let page_lock know what to do. 32977c478bd9Sstevel@tonic-gate */ 32987c478bd9Sstevel@tonic-gate if (!page_lock(pp, SE_EXCL, phm, P_RECLAIM)) { 32997c478bd9Sstevel@tonic-gate /* 33007c478bd9Sstevel@tonic-gate * Went to sleep because the page could not 33017c478bd9Sstevel@tonic-gate * be locked. We were woken up when the page 33027c478bd9Sstevel@tonic-gate * was unlocked, or when the page was destroyed. 33037c478bd9Sstevel@tonic-gate * In either case, `phm' was dropped while we 33047c478bd9Sstevel@tonic-gate * slept. Hence we should not just roar through 33057c478bd9Sstevel@tonic-gate * this loop. 33067c478bd9Sstevel@tonic-gate */ 33077c478bd9Sstevel@tonic-gate goto top; 33087c478bd9Sstevel@tonic-gate } 33097c478bd9Sstevel@tonic-gate 331037fbc076Saguzovsk /* 331137fbc076Saguzovsk * If an existing page is a large page, then demote 331237fbc076Saguzovsk * it to ensure that no "partial" large pages are 331337fbc076Saguzovsk * "created" after page_rename. An existing page 331437fbc076Saguzovsk * can be a CacheFS page, and can't belong to swapfs. 331537fbc076Saguzovsk */ 33167c478bd9Sstevel@tonic-gate if (hat_page_is_mapped(pp)) { 33177c478bd9Sstevel@tonic-gate /* 33187c478bd9Sstevel@tonic-gate * Unload translations. Since we hold the 33197c478bd9Sstevel@tonic-gate * exclusive lock on this page, the page 33207c478bd9Sstevel@tonic-gate * can not be changed while we drop phm. 33217c478bd9Sstevel@tonic-gate * This is also not a lock protocol violation, 33227c478bd9Sstevel@tonic-gate * but rather the proper way to do things. 33237c478bd9Sstevel@tonic-gate */ 33247c478bd9Sstevel@tonic-gate mutex_exit(phm); 33257c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 332637fbc076Saguzovsk if (pp->p_szc != 0) { 332737fbc076Saguzovsk ASSERT(!IS_SWAPFSVP(vp)); 3328ad23a2dbSjohansen ASSERT(!VN_ISKAS(vp)); 332937fbc076Saguzovsk page_demote_vp_pages(pp); 333037fbc076Saguzovsk ASSERT(pp->p_szc == 0); 333137fbc076Saguzovsk } 333237fbc076Saguzovsk mutex_enter(phm); 333337fbc076Saguzovsk } else if (pp->p_szc != 0) { 333437fbc076Saguzovsk ASSERT(!IS_SWAPFSVP(vp)); 3335ad23a2dbSjohansen ASSERT(!VN_ISKAS(vp)); 333637fbc076Saguzovsk mutex_exit(phm); 333737fbc076Saguzovsk page_demote_vp_pages(pp); 333837fbc076Saguzovsk ASSERT(pp->p_szc == 0); 33397c478bd9Sstevel@tonic-gate mutex_enter(phm); 33407c478bd9Sstevel@tonic-gate } 33417c478bd9Sstevel@tonic-gate page_hashout(pp, phm); 33427c478bd9Sstevel@tonic-gate } 33437c478bd9Sstevel@tonic-gate /* 33447c478bd9Sstevel@tonic-gate * Hash in the page with the new identity. 33457c478bd9Sstevel@tonic-gate */ 33467c478bd9Sstevel@tonic-gate if (!page_hashin(opp, vp, off, phm)) { 33477c478bd9Sstevel@tonic-gate /* 33487c478bd9Sstevel@tonic-gate * We were holding phm while we searched for [vp, off] 33497c478bd9Sstevel@tonic-gate * and only dropped phm if we found and locked a page. 33507c478bd9Sstevel@tonic-gate * If we can't create this page now, then some thing 33517c478bd9Sstevel@tonic-gate * is really broken. 33527c478bd9Sstevel@tonic-gate */ 33537c478bd9Sstevel@tonic-gate panic("page_rename: Can't hash in page: %p", (void *)pp); 33547c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 33557c478bd9Sstevel@tonic-gate } 33567c478bd9Sstevel@tonic-gate 33577c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 33587c478bd9Sstevel@tonic-gate mutex_exit(phm); 33597c478bd9Sstevel@tonic-gate 33607c478bd9Sstevel@tonic-gate /* 33617c478bd9Sstevel@tonic-gate * Now that we have dropped phm, lets get around to finishing up 33627c478bd9Sstevel@tonic-gate * with pp. 33637c478bd9Sstevel@tonic-gate */ 33647c478bd9Sstevel@tonic-gate if (pp != NULL) { 33657c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 33667c478bd9Sstevel@tonic-gate /* for now large pages should not end up here */ 33677c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 33687c478bd9Sstevel@tonic-gate /* 33697c478bd9Sstevel@tonic-gate * Save the locks for transfer to the new page and then 33707c478bd9Sstevel@tonic-gate * clear them so page_free doesn't think they're important. 33717c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt and 33727c478bd9Sstevel@tonic-gate * cowcnt since the page has an "exclusive" lock. 33737c478bd9Sstevel@tonic-gate */ 33747c478bd9Sstevel@tonic-gate olckcnt = pp->p_lckcnt; 33757c478bd9Sstevel@tonic-gate ocowcnt = pp->p_cowcnt; 33767c478bd9Sstevel@tonic-gate pp->p_lckcnt = pp->p_cowcnt = 0; 33777c478bd9Sstevel@tonic-gate 33787c478bd9Sstevel@tonic-gate /* 33797c478bd9Sstevel@tonic-gate * Put the page on the "free" list after we drop 33807c478bd9Sstevel@tonic-gate * the lock. The less work under the lock the better. 33817c478bd9Sstevel@tonic-gate */ 33827c478bd9Sstevel@tonic-gate /*LINTED: constant in conditional context*/ 33837c478bd9Sstevel@tonic-gate VN_DISPOSE(pp, B_FREE, 0, kcred); 33847c478bd9Sstevel@tonic-gate } 33857c478bd9Sstevel@tonic-gate 33867c478bd9Sstevel@tonic-gate /* 33877c478bd9Sstevel@tonic-gate * Transfer the lock count from the old page (if any). 33887c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt and 33897c478bd9Sstevel@tonic-gate * cowcnt since the page has an "exclusive" lock. 33907c478bd9Sstevel@tonic-gate */ 33917c478bd9Sstevel@tonic-gate opp->p_lckcnt += olckcnt; 33927c478bd9Sstevel@tonic-gate opp->p_cowcnt += ocowcnt; 33937c478bd9Sstevel@tonic-gate } 33947c478bd9Sstevel@tonic-gate 33957c478bd9Sstevel@tonic-gate /* 33967c478bd9Sstevel@tonic-gate * low level routine to add page `pp' to the hash and vp chains for [vp, offset] 33977c478bd9Sstevel@tonic-gate * 33987c478bd9Sstevel@tonic-gate * Pages are normally inserted at the start of a vnode's v_pages list. 33997c478bd9Sstevel@tonic-gate * If the vnode is VMODSORT and the page is modified, it goes at the end. 34007c478bd9Sstevel@tonic-gate * This can happen when a modified page is relocated for DR. 34017c478bd9Sstevel@tonic-gate * 34027c478bd9Sstevel@tonic-gate * Returns 1 on success and 0 on failure. 34037c478bd9Sstevel@tonic-gate */ 34047c478bd9Sstevel@tonic-gate static int 34057c478bd9Sstevel@tonic-gate page_do_hashin(page_t *pp, vnode_t *vp, u_offset_t offset) 34067c478bd9Sstevel@tonic-gate { 34077c478bd9Sstevel@tonic-gate page_t **listp; 34087c478bd9Sstevel@tonic-gate page_t *tp; 34097c478bd9Sstevel@tonic-gate ulong_t index; 34107c478bd9Sstevel@tonic-gate 34117c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 34127c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 34137c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(page_vnode_mutex(vp))); 34147c478bd9Sstevel@tonic-gate 34157c478bd9Sstevel@tonic-gate /* 34167c478bd9Sstevel@tonic-gate * Be sure to set these up before the page is inserted on the hash 34177c478bd9Sstevel@tonic-gate * list. As soon as the page is placed on the list some other 34187c478bd9Sstevel@tonic-gate * thread might get confused and wonder how this page could 34197c478bd9Sstevel@tonic-gate * possibly hash to this list. 34207c478bd9Sstevel@tonic-gate */ 34217c478bd9Sstevel@tonic-gate pp->p_vnode = vp; 34227c478bd9Sstevel@tonic-gate pp->p_offset = offset; 34237c478bd9Sstevel@tonic-gate 34247c478bd9Sstevel@tonic-gate /* 34257c478bd9Sstevel@tonic-gate * record if this page is on a swap vnode 34267c478bd9Sstevel@tonic-gate */ 34277c478bd9Sstevel@tonic-gate if ((vp->v_flag & VISSWAP) != 0) 34287c478bd9Sstevel@tonic-gate PP_SETSWAP(pp); 34297c478bd9Sstevel@tonic-gate 34307c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, offset); 34317c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(PAGE_HASH_MUTEX(index))); 34327c478bd9Sstevel@tonic-gate listp = &page_hash[index]; 34337c478bd9Sstevel@tonic-gate 34347c478bd9Sstevel@tonic-gate /* 34357c478bd9Sstevel@tonic-gate * If this page is already hashed in, fail this attempt to add it. 34367c478bd9Sstevel@tonic-gate */ 34377c478bd9Sstevel@tonic-gate for (tp = *listp; tp != NULL; tp = tp->p_hash) { 34387c478bd9Sstevel@tonic-gate if (tp->p_vnode == vp && tp->p_offset == offset) { 34397c478bd9Sstevel@tonic-gate pp->p_vnode = NULL; 34407c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)(-1); 34417c478bd9Sstevel@tonic-gate return (0); 34427c478bd9Sstevel@tonic-gate } 34437c478bd9Sstevel@tonic-gate } 34447c478bd9Sstevel@tonic-gate pp->p_hash = *listp; 34457c478bd9Sstevel@tonic-gate *listp = pp; 34467c478bd9Sstevel@tonic-gate 34477c478bd9Sstevel@tonic-gate /* 34487c478bd9Sstevel@tonic-gate * Add the page to the vnode's list of pages 34497c478bd9Sstevel@tonic-gate */ 34507c478bd9Sstevel@tonic-gate if (vp->v_pages != NULL && IS_VMODSORT(vp) && hat_ismod(pp)) 34517c478bd9Sstevel@tonic-gate listp = &vp->v_pages->p_vpprev->p_vpnext; 34527c478bd9Sstevel@tonic-gate else 34537c478bd9Sstevel@tonic-gate listp = &vp->v_pages; 34547c478bd9Sstevel@tonic-gate 34557c478bd9Sstevel@tonic-gate page_vpadd(listp, pp); 34567c478bd9Sstevel@tonic-gate 34577c478bd9Sstevel@tonic-gate return (1); 34587c478bd9Sstevel@tonic-gate } 34597c478bd9Sstevel@tonic-gate 34607c478bd9Sstevel@tonic-gate /* 34617c478bd9Sstevel@tonic-gate * Add page `pp' to both the hash and vp chains for [vp, offset]. 34627c478bd9Sstevel@tonic-gate * 34637c478bd9Sstevel@tonic-gate * Returns 1 on success and 0 on failure. 34647c478bd9Sstevel@tonic-gate * If hold is passed in, it is not dropped. 34657c478bd9Sstevel@tonic-gate */ 34667c478bd9Sstevel@tonic-gate int 34677c478bd9Sstevel@tonic-gate page_hashin(page_t *pp, vnode_t *vp, u_offset_t offset, kmutex_t *hold) 34687c478bd9Sstevel@tonic-gate { 34697c478bd9Sstevel@tonic-gate kmutex_t *phm = NULL; 34707c478bd9Sstevel@tonic-gate kmutex_t *vphm; 34717c478bd9Sstevel@tonic-gate int rc; 34727c478bd9Sstevel@tonic-gate 34737c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 3474c7531c7fSPrakash Sangappa ASSERT(pp->p_fsdata == 0 || panicstr); 34757c478bd9Sstevel@tonic-gate 34767c478bd9Sstevel@tonic-gate TRACE_3(TR_FAC_VM, TR_PAGE_HASHIN, 34776e4dd838Smec "page_hashin:pp %p vp %p offset %llx", 34786e4dd838Smec pp, vp, offset); 34797c478bd9Sstevel@tonic-gate 34807c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashin_count); 34817c478bd9Sstevel@tonic-gate 34827c478bd9Sstevel@tonic-gate if (hold != NULL) 34837c478bd9Sstevel@tonic-gate phm = hold; 34847c478bd9Sstevel@tonic-gate else { 34857c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashin_not_held); 34867c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(PAGE_HASH_FUNC(vp, offset)); 34877c478bd9Sstevel@tonic-gate mutex_enter(phm); 34887c478bd9Sstevel@tonic-gate } 34897c478bd9Sstevel@tonic-gate 34907c478bd9Sstevel@tonic-gate vphm = page_vnode_mutex(vp); 34917c478bd9Sstevel@tonic-gate mutex_enter(vphm); 34927c478bd9Sstevel@tonic-gate rc = page_do_hashin(pp, vp, offset); 34937c478bd9Sstevel@tonic-gate mutex_exit(vphm); 34947c478bd9Sstevel@tonic-gate if (hold == NULL) 34957c478bd9Sstevel@tonic-gate mutex_exit(phm); 3496d94ffb28Sjmcp if (rc == 0) 34977c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashin_already); 34987c478bd9Sstevel@tonic-gate return (rc); 34997c478bd9Sstevel@tonic-gate } 35007c478bd9Sstevel@tonic-gate 35017c478bd9Sstevel@tonic-gate /* 35027c478bd9Sstevel@tonic-gate * Remove page ``pp'' from the hash and vp chains and remove vp association. 35037c478bd9Sstevel@tonic-gate * All mutexes must be held 35047c478bd9Sstevel@tonic-gate */ 35057c478bd9Sstevel@tonic-gate static void 35067c478bd9Sstevel@tonic-gate page_do_hashout(page_t *pp) 35077c478bd9Sstevel@tonic-gate { 35087c478bd9Sstevel@tonic-gate page_t **hpp; 35097c478bd9Sstevel@tonic-gate page_t *hp; 35107c478bd9Sstevel@tonic-gate vnode_t *vp = pp->p_vnode; 35117c478bd9Sstevel@tonic-gate 35127c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 35137c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(page_vnode_mutex(vp))); 35147c478bd9Sstevel@tonic-gate 35157c478bd9Sstevel@tonic-gate /* 35167c478bd9Sstevel@tonic-gate * First, take pp off of its hash chain. 35177c478bd9Sstevel@tonic-gate */ 35187c478bd9Sstevel@tonic-gate hpp = &page_hash[PAGE_HASH_FUNC(vp, pp->p_offset)]; 35197c478bd9Sstevel@tonic-gate 35207c478bd9Sstevel@tonic-gate for (;;) { 35217c478bd9Sstevel@tonic-gate hp = *hpp; 35227c478bd9Sstevel@tonic-gate if (hp == pp) 35237c478bd9Sstevel@tonic-gate break; 35247c478bd9Sstevel@tonic-gate if (hp == NULL) { 35257c478bd9Sstevel@tonic-gate panic("page_do_hashout"); 35267c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 35277c478bd9Sstevel@tonic-gate } 35287c478bd9Sstevel@tonic-gate hpp = &hp->p_hash; 35297c478bd9Sstevel@tonic-gate } 35307c478bd9Sstevel@tonic-gate *hpp = pp->p_hash; 35317c478bd9Sstevel@tonic-gate 35327c478bd9Sstevel@tonic-gate /* 35337c478bd9Sstevel@tonic-gate * Now remove it from its associated vnode. 35347c478bd9Sstevel@tonic-gate */ 35357c478bd9Sstevel@tonic-gate if (vp->v_pages) 35367c478bd9Sstevel@tonic-gate page_vpsub(&vp->v_pages, pp); 35377c478bd9Sstevel@tonic-gate 35387c478bd9Sstevel@tonic-gate pp->p_hash = NULL; 35399d0d62adSJason Beloro page_clr_all_props(pp); 35407c478bd9Sstevel@tonic-gate PP_CLRSWAP(pp); 35417c478bd9Sstevel@tonic-gate pp->p_vnode = NULL; 35427c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)-1; 3543c7531c7fSPrakash Sangappa pp->p_fsdata = 0; 35447c478bd9Sstevel@tonic-gate } 35457c478bd9Sstevel@tonic-gate 35467c478bd9Sstevel@tonic-gate /* 35477c478bd9Sstevel@tonic-gate * Remove page ``pp'' from the hash and vp chains and remove vp association. 35487c478bd9Sstevel@tonic-gate * 35497c478bd9Sstevel@tonic-gate * When `phm' is non-NULL it contains the address of the mutex protecting the 35507c478bd9Sstevel@tonic-gate * hash list pp is on. It is not dropped. 35517c478bd9Sstevel@tonic-gate */ 35527c478bd9Sstevel@tonic-gate void 35537c478bd9Sstevel@tonic-gate page_hashout(page_t *pp, kmutex_t *phm) 35547c478bd9Sstevel@tonic-gate { 35557c478bd9Sstevel@tonic-gate vnode_t *vp; 35567c478bd9Sstevel@tonic-gate ulong_t index; 35577c478bd9Sstevel@tonic-gate kmutex_t *nphm; 35587c478bd9Sstevel@tonic-gate kmutex_t *vphm; 35597c478bd9Sstevel@tonic-gate kmutex_t *sep; 35607c478bd9Sstevel@tonic-gate 35617c478bd9Sstevel@tonic-gate ASSERT(phm != NULL ? MUTEX_HELD(phm) : 1); 35627c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode != NULL); 35637c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(pp) && !page_iolock_assert(pp)) || panicstr); 35647c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(pp->p_vnode))); 35657c478bd9Sstevel@tonic-gate 35667c478bd9Sstevel@tonic-gate vp = pp->p_vnode; 35677c478bd9Sstevel@tonic-gate 35687c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_HASHOUT, 35696e4dd838Smec "page_hashout:pp %p vp %p", pp, vp); 35707c478bd9Sstevel@tonic-gate 35717c478bd9Sstevel@tonic-gate /* Kernel probe */ 35727c478bd9Sstevel@tonic-gate TNF_PROBE_2(page_unmap, "vm pagefault", /* CSTYLED */, 35737c478bd9Sstevel@tonic-gate tnf_opaque, vnode, vp, 35747c478bd9Sstevel@tonic-gate tnf_offset, offset, pp->p_offset); 35757c478bd9Sstevel@tonic-gate 35767c478bd9Sstevel@tonic-gate /* 35777c478bd9Sstevel@tonic-gate * 35787c478bd9Sstevel@tonic-gate */ 35797c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashout_count); 35807c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, pp->p_offset); 35817c478bd9Sstevel@tonic-gate if (phm == NULL) { 35827c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashout_not_held); 35837c478bd9Sstevel@tonic-gate nphm = PAGE_HASH_MUTEX(index); 35847c478bd9Sstevel@tonic-gate mutex_enter(nphm); 35857c478bd9Sstevel@tonic-gate } 35867c478bd9Sstevel@tonic-gate ASSERT(phm ? phm == PAGE_HASH_MUTEX(index) : 1); 35877c478bd9Sstevel@tonic-gate 35887c478bd9Sstevel@tonic-gate 35897c478bd9Sstevel@tonic-gate /* 35907c478bd9Sstevel@tonic-gate * grab page vnode mutex and remove it... 35917c478bd9Sstevel@tonic-gate */ 35927c478bd9Sstevel@tonic-gate vphm = page_vnode_mutex(vp); 35937c478bd9Sstevel@tonic-gate mutex_enter(vphm); 35947c478bd9Sstevel@tonic-gate 35957c478bd9Sstevel@tonic-gate page_do_hashout(pp); 35967c478bd9Sstevel@tonic-gate 35977c478bd9Sstevel@tonic-gate mutex_exit(vphm); 35987c478bd9Sstevel@tonic-gate if (phm == NULL) 35997c478bd9Sstevel@tonic-gate mutex_exit(nphm); 36007c478bd9Sstevel@tonic-gate 36017c478bd9Sstevel@tonic-gate /* 36027c478bd9Sstevel@tonic-gate * Wake up processes waiting for this page. The page's 36037c478bd9Sstevel@tonic-gate * identity has been changed, and is probably not the 36047c478bd9Sstevel@tonic-gate * desired page any longer. 36057c478bd9Sstevel@tonic-gate */ 36067c478bd9Sstevel@tonic-gate sep = page_se_mutex(pp); 36077c478bd9Sstevel@tonic-gate mutex_enter(sep); 360842787a71Sstans pp->p_selock &= ~SE_EWANTED; 36097c478bd9Sstevel@tonic-gate if (CV_HAS_WAITERS(&pp->p_cv)) 36107c478bd9Sstevel@tonic-gate cv_broadcast(&pp->p_cv); 36117c478bd9Sstevel@tonic-gate mutex_exit(sep); 36127c478bd9Sstevel@tonic-gate } 36137c478bd9Sstevel@tonic-gate 36147c478bd9Sstevel@tonic-gate /* 36157c478bd9Sstevel@tonic-gate * Add the page to the front of a linked list of pages 36167c478bd9Sstevel@tonic-gate * using the p_next & p_prev pointers for the list. 36177c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the list pointers. 36187c478bd9Sstevel@tonic-gate */ 36197c478bd9Sstevel@tonic-gate void 36207c478bd9Sstevel@tonic-gate page_add(page_t **ppp, page_t *pp) 36217c478bd9Sstevel@tonic-gate { 36227c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp) || (PAGE_SHARED(pp) && page_iolock_assert(pp))); 36237c478bd9Sstevel@tonic-gate 36247c478bd9Sstevel@tonic-gate page_add_common(ppp, pp); 36257c478bd9Sstevel@tonic-gate } 36267c478bd9Sstevel@tonic-gate 36277c478bd9Sstevel@tonic-gate 36287c478bd9Sstevel@tonic-gate 36297c478bd9Sstevel@tonic-gate /* 36307c478bd9Sstevel@tonic-gate * Common code for page_add() and mach_page_add() 36317c478bd9Sstevel@tonic-gate */ 36327c478bd9Sstevel@tonic-gate void 36337c478bd9Sstevel@tonic-gate page_add_common(page_t **ppp, page_t *pp) 36347c478bd9Sstevel@tonic-gate { 36357c478bd9Sstevel@tonic-gate if (*ppp == NULL) { 36367c478bd9Sstevel@tonic-gate pp->p_next = pp->p_prev = pp; 36377c478bd9Sstevel@tonic-gate } else { 36387c478bd9Sstevel@tonic-gate pp->p_next = *ppp; 36397c478bd9Sstevel@tonic-gate pp->p_prev = (*ppp)->p_prev; 36407c478bd9Sstevel@tonic-gate (*ppp)->p_prev = pp; 36417c478bd9Sstevel@tonic-gate pp->p_prev->p_next = pp; 36427c478bd9Sstevel@tonic-gate } 36437c478bd9Sstevel@tonic-gate *ppp = pp; 36447c478bd9Sstevel@tonic-gate } 36457c478bd9Sstevel@tonic-gate 36467c478bd9Sstevel@tonic-gate 36477c478bd9Sstevel@tonic-gate /* 36487c478bd9Sstevel@tonic-gate * Remove this page from a linked list of pages 36497c478bd9Sstevel@tonic-gate * using the p_next & p_prev pointers for the list. 36507c478bd9Sstevel@tonic-gate * 36517c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the list pointers. 36527c478bd9Sstevel@tonic-gate */ 36537c478bd9Sstevel@tonic-gate void 36547c478bd9Sstevel@tonic-gate page_sub(page_t **ppp, page_t *pp) 36557c478bd9Sstevel@tonic-gate { 36567c478bd9Sstevel@tonic-gate ASSERT((PP_ISFREE(pp)) ? 1 : 36577c478bd9Sstevel@tonic-gate (PAGE_EXCL(pp)) || (PAGE_SHARED(pp) && page_iolock_assert(pp))); 36587c478bd9Sstevel@tonic-gate 36597c478bd9Sstevel@tonic-gate if (*ppp == NULL || pp == NULL) { 36607c478bd9Sstevel@tonic-gate panic("page_sub: bad arg(s): pp %p, *ppp %p", 36617c478bd9Sstevel@tonic-gate (void *)pp, (void *)(*ppp)); 36627c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 36637c478bd9Sstevel@tonic-gate } 36647c478bd9Sstevel@tonic-gate 36657c478bd9Sstevel@tonic-gate page_sub_common(ppp, pp); 36667c478bd9Sstevel@tonic-gate } 36677c478bd9Sstevel@tonic-gate 36687c478bd9Sstevel@tonic-gate 36697c478bd9Sstevel@tonic-gate /* 36707c478bd9Sstevel@tonic-gate * Common code for page_sub() and mach_page_sub() 36717c478bd9Sstevel@tonic-gate */ 36727c478bd9Sstevel@tonic-gate void 36737c478bd9Sstevel@tonic-gate page_sub_common(page_t **ppp, page_t *pp) 36747c478bd9Sstevel@tonic-gate { 36757c478bd9Sstevel@tonic-gate if (*ppp == pp) 36767c478bd9Sstevel@tonic-gate *ppp = pp->p_next; /* go to next page */ 36777c478bd9Sstevel@tonic-gate 36787c478bd9Sstevel@tonic-gate if (*ppp == pp) 36797c478bd9Sstevel@tonic-gate *ppp = NULL; /* page list is gone */ 36807c478bd9Sstevel@tonic-gate else { 36817c478bd9Sstevel@tonic-gate pp->p_prev->p_next = pp->p_next; 36827c478bd9Sstevel@tonic-gate pp->p_next->p_prev = pp->p_prev; 36837c478bd9Sstevel@tonic-gate } 36847c478bd9Sstevel@tonic-gate pp->p_prev = pp->p_next = pp; /* make pp a list of one */ 36857c478bd9Sstevel@tonic-gate } 36867c478bd9Sstevel@tonic-gate 36877c478bd9Sstevel@tonic-gate 36887c478bd9Sstevel@tonic-gate /* 36897c478bd9Sstevel@tonic-gate * Break page list cppp into two lists with npages in the first list. 36907c478bd9Sstevel@tonic-gate * The tail is returned in nppp. 36917c478bd9Sstevel@tonic-gate */ 36927c478bd9Sstevel@tonic-gate void 36937c478bd9Sstevel@tonic-gate page_list_break(page_t **oppp, page_t **nppp, pgcnt_t npages) 36947c478bd9Sstevel@tonic-gate { 36957c478bd9Sstevel@tonic-gate page_t *s1pp = *oppp; 36967c478bd9Sstevel@tonic-gate page_t *s2pp; 36977c478bd9Sstevel@tonic-gate page_t *e1pp, *e2pp; 36987c478bd9Sstevel@tonic-gate long n = 0; 36997c478bd9Sstevel@tonic-gate 37007c478bd9Sstevel@tonic-gate if (s1pp == NULL) { 37017c478bd9Sstevel@tonic-gate *nppp = NULL; 37027c478bd9Sstevel@tonic-gate return; 37037c478bd9Sstevel@tonic-gate } 37047c478bd9Sstevel@tonic-gate if (npages == 0) { 37057c478bd9Sstevel@tonic-gate *nppp = s1pp; 37067c478bd9Sstevel@tonic-gate *oppp = NULL; 37077c478bd9Sstevel@tonic-gate return; 37087c478bd9Sstevel@tonic-gate } 37097c478bd9Sstevel@tonic-gate for (n = 0, s2pp = *oppp; n < npages; n++) { 37107c478bd9Sstevel@tonic-gate s2pp = s2pp->p_next; 37117c478bd9Sstevel@tonic-gate } 37127c478bd9Sstevel@tonic-gate /* Fix head and tail of new lists */ 37137c478bd9Sstevel@tonic-gate e1pp = s2pp->p_prev; 37147c478bd9Sstevel@tonic-gate e2pp = s1pp->p_prev; 37157c478bd9Sstevel@tonic-gate s1pp->p_prev = e1pp; 37167c478bd9Sstevel@tonic-gate e1pp->p_next = s1pp; 37177c478bd9Sstevel@tonic-gate s2pp->p_prev = e2pp; 37187c478bd9Sstevel@tonic-gate e2pp->p_next = s2pp; 37197c478bd9Sstevel@tonic-gate 37207c478bd9Sstevel@tonic-gate /* second list empty */ 37217c478bd9Sstevel@tonic-gate if (s2pp == s1pp) { 37227c478bd9Sstevel@tonic-gate *oppp = s1pp; 37237c478bd9Sstevel@tonic-gate *nppp = NULL; 37247c478bd9Sstevel@tonic-gate } else { 37257c478bd9Sstevel@tonic-gate *oppp = s1pp; 37267c478bd9Sstevel@tonic-gate *nppp = s2pp; 37277c478bd9Sstevel@tonic-gate } 37287c478bd9Sstevel@tonic-gate } 37297c478bd9Sstevel@tonic-gate 37307c478bd9Sstevel@tonic-gate /* 37317c478bd9Sstevel@tonic-gate * Concatenate page list nppp onto the end of list ppp. 37327c478bd9Sstevel@tonic-gate */ 37337c478bd9Sstevel@tonic-gate void 37347c478bd9Sstevel@tonic-gate page_list_concat(page_t **ppp, page_t **nppp) 37357c478bd9Sstevel@tonic-gate { 37367c478bd9Sstevel@tonic-gate page_t *s1pp, *s2pp, *e1pp, *e2pp; 37377c478bd9Sstevel@tonic-gate 37387c478bd9Sstevel@tonic-gate if (*nppp == NULL) { 37397c478bd9Sstevel@tonic-gate return; 37407c478bd9Sstevel@tonic-gate } 37417c478bd9Sstevel@tonic-gate if (*ppp == NULL) { 37427c478bd9Sstevel@tonic-gate *ppp = *nppp; 37437c478bd9Sstevel@tonic-gate return; 37447c478bd9Sstevel@tonic-gate } 37457c478bd9Sstevel@tonic-gate s1pp = *ppp; 37467c478bd9Sstevel@tonic-gate e1pp = s1pp->p_prev; 37477c478bd9Sstevel@tonic-gate s2pp = *nppp; 37487c478bd9Sstevel@tonic-gate e2pp = s2pp->p_prev; 37497c478bd9Sstevel@tonic-gate s1pp->p_prev = e2pp; 37507c478bd9Sstevel@tonic-gate e2pp->p_next = s1pp; 37517c478bd9Sstevel@tonic-gate e1pp->p_next = s2pp; 37527c478bd9Sstevel@tonic-gate s2pp->p_prev = e1pp; 37537c478bd9Sstevel@tonic-gate } 37547c478bd9Sstevel@tonic-gate 37557c478bd9Sstevel@tonic-gate /* 37567c478bd9Sstevel@tonic-gate * return the next page in the page list 37577c478bd9Sstevel@tonic-gate */ 37587c478bd9Sstevel@tonic-gate page_t * 37597c478bd9Sstevel@tonic-gate page_list_next(page_t *pp) 37607c478bd9Sstevel@tonic-gate { 37617c478bd9Sstevel@tonic-gate return (pp->p_next); 37627c478bd9Sstevel@tonic-gate } 37637c478bd9Sstevel@tonic-gate 37647c478bd9Sstevel@tonic-gate 37657c478bd9Sstevel@tonic-gate /* 37667c478bd9Sstevel@tonic-gate * Add the page to the front of the linked list of pages 37677c478bd9Sstevel@tonic-gate * using p_vpnext/p_vpprev pointers for the list. 37687c478bd9Sstevel@tonic-gate * 37697c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the lists. 37707c478bd9Sstevel@tonic-gate */ 37717c478bd9Sstevel@tonic-gate void 37727c478bd9Sstevel@tonic-gate page_vpadd(page_t **ppp, page_t *pp) 37737c478bd9Sstevel@tonic-gate { 37747c478bd9Sstevel@tonic-gate if (*ppp == NULL) { 37757c478bd9Sstevel@tonic-gate pp->p_vpnext = pp->p_vpprev = pp; 37767c478bd9Sstevel@tonic-gate } else { 37777c478bd9Sstevel@tonic-gate pp->p_vpnext = *ppp; 37787c478bd9Sstevel@tonic-gate pp->p_vpprev = (*ppp)->p_vpprev; 37797c478bd9Sstevel@tonic-gate (*ppp)->p_vpprev = pp; 37807c478bd9Sstevel@tonic-gate pp->p_vpprev->p_vpnext = pp; 37817c478bd9Sstevel@tonic-gate } 37827c478bd9Sstevel@tonic-gate *ppp = pp; 37837c478bd9Sstevel@tonic-gate } 37847c478bd9Sstevel@tonic-gate 37857c478bd9Sstevel@tonic-gate /* 37867c478bd9Sstevel@tonic-gate * Remove this page from the linked list of pages 37877c478bd9Sstevel@tonic-gate * using p_vpnext/p_vpprev pointers for the list. 37887c478bd9Sstevel@tonic-gate * 37897c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the lists. 37907c478bd9Sstevel@tonic-gate */ 37917c478bd9Sstevel@tonic-gate void 37927c478bd9Sstevel@tonic-gate page_vpsub(page_t **ppp, page_t *pp) 37937c478bd9Sstevel@tonic-gate { 37947c478bd9Sstevel@tonic-gate if (*ppp == NULL || pp == NULL) { 37957c478bd9Sstevel@tonic-gate panic("page_vpsub: bad arg(s): pp %p, *ppp %p", 37967c478bd9Sstevel@tonic-gate (void *)pp, (void *)(*ppp)); 37977c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 37987c478bd9Sstevel@tonic-gate } 37997c478bd9Sstevel@tonic-gate 38007c478bd9Sstevel@tonic-gate if (*ppp == pp) 38017c478bd9Sstevel@tonic-gate *ppp = pp->p_vpnext; /* go to next page */ 38027c478bd9Sstevel@tonic-gate 38037c478bd9Sstevel@tonic-gate if (*ppp == pp) 38047c478bd9Sstevel@tonic-gate *ppp = NULL; /* page list is gone */ 38057c478bd9Sstevel@tonic-gate else { 38067c478bd9Sstevel@tonic-gate pp->p_vpprev->p_vpnext = pp->p_vpnext; 38077c478bd9Sstevel@tonic-gate pp->p_vpnext->p_vpprev = pp->p_vpprev; 38087c478bd9Sstevel@tonic-gate } 38097c478bd9Sstevel@tonic-gate pp->p_vpprev = pp->p_vpnext = pp; /* make pp a list of one */ 38107c478bd9Sstevel@tonic-gate } 38117c478bd9Sstevel@tonic-gate 38127c478bd9Sstevel@tonic-gate /* 38137c478bd9Sstevel@tonic-gate * Lock a physical page into memory "long term". Used to support "lock 38147c478bd9Sstevel@tonic-gate * in memory" functions. Accepts the page to be locked, and a cow variable 38157c478bd9Sstevel@tonic-gate * to indicate whether a the lock will travel to the new page during 38167c478bd9Sstevel@tonic-gate * a potential copy-on-write. 38177c478bd9Sstevel@tonic-gate */ 38187c478bd9Sstevel@tonic-gate int 38197c478bd9Sstevel@tonic-gate page_pp_lock( 38207c478bd9Sstevel@tonic-gate page_t *pp, /* page to be locked */ 38217c478bd9Sstevel@tonic-gate int cow, /* cow lock */ 38227c478bd9Sstevel@tonic-gate int kernel) /* must succeed -- ignore checking */ 38237c478bd9Sstevel@tonic-gate { 38247c478bd9Sstevel@tonic-gate int r = 0; /* result -- assume failure */ 38257c478bd9Sstevel@tonic-gate 38267c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 38277c478bd9Sstevel@tonic-gate 38287c478bd9Sstevel@tonic-gate page_struct_lock(pp); 38297c478bd9Sstevel@tonic-gate /* 38307c478bd9Sstevel@tonic-gate * Acquire the "freemem_lock" for availrmem. 38317c478bd9Sstevel@tonic-gate */ 38327c478bd9Sstevel@tonic-gate if (cow) { 38337c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 38347c478bd9Sstevel@tonic-gate if ((availrmem > pages_pp_maximum) && 38357c478bd9Sstevel@tonic-gate (pp->p_cowcnt < (ushort_t)PAGE_LOCK_MAXIMUM)) { 38367c478bd9Sstevel@tonic-gate availrmem--; 38377c478bd9Sstevel@tonic-gate pages_locked++; 38387c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 38397c478bd9Sstevel@tonic-gate r = 1; 38407c478bd9Sstevel@tonic-gate if (++pp->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 38417c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 38427c478bd9Sstevel@tonic-gate "COW lock limit reached on pfn 0x%lx", 38437c478bd9Sstevel@tonic-gate page_pptonum(pp)); 38447c478bd9Sstevel@tonic-gate } 38457c478bd9Sstevel@tonic-gate } else 38467c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 38477c478bd9Sstevel@tonic-gate } else { 38487c478bd9Sstevel@tonic-gate if (pp->p_lckcnt) { 38497c478bd9Sstevel@tonic-gate if (pp->p_lckcnt < (ushort_t)PAGE_LOCK_MAXIMUM) { 38507c478bd9Sstevel@tonic-gate r = 1; 38517c478bd9Sstevel@tonic-gate if (++pp->p_lckcnt == 38527c478bd9Sstevel@tonic-gate (ushort_t)PAGE_LOCK_MAXIMUM) { 38537c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Page lock limit " 38547c478bd9Sstevel@tonic-gate "reached on pfn 0x%lx", 38557c478bd9Sstevel@tonic-gate page_pptonum(pp)); 38567c478bd9Sstevel@tonic-gate } 38577c478bd9Sstevel@tonic-gate } 38587c478bd9Sstevel@tonic-gate } else { 38597c478bd9Sstevel@tonic-gate if (kernel) { 38607c478bd9Sstevel@tonic-gate /* availrmem accounting done by caller */ 38617c478bd9Sstevel@tonic-gate ++pp->p_lckcnt; 38627c478bd9Sstevel@tonic-gate r = 1; 38637c478bd9Sstevel@tonic-gate } else { 38647c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 38657c478bd9Sstevel@tonic-gate if (availrmem > pages_pp_maximum) { 38667c478bd9Sstevel@tonic-gate availrmem--; 38677c478bd9Sstevel@tonic-gate pages_locked++; 38687c478bd9Sstevel@tonic-gate ++pp->p_lckcnt; 38697c478bd9Sstevel@tonic-gate r = 1; 38707c478bd9Sstevel@tonic-gate } 38717c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 38727c478bd9Sstevel@tonic-gate } 38737c478bd9Sstevel@tonic-gate } 38747c478bd9Sstevel@tonic-gate } 38757c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 38767c478bd9Sstevel@tonic-gate return (r); 38777c478bd9Sstevel@tonic-gate } 38787c478bd9Sstevel@tonic-gate 38797c478bd9Sstevel@tonic-gate /* 38807c478bd9Sstevel@tonic-gate * Decommit a lock on a physical page frame. Account for cow locks if 38817c478bd9Sstevel@tonic-gate * appropriate. 38827c478bd9Sstevel@tonic-gate */ 38837c478bd9Sstevel@tonic-gate void 38847c478bd9Sstevel@tonic-gate page_pp_unlock( 38857c478bd9Sstevel@tonic-gate page_t *pp, /* page to be unlocked */ 38867c478bd9Sstevel@tonic-gate int cow, /* expect cow lock */ 38877c478bd9Sstevel@tonic-gate int kernel) /* this was a kernel lock */ 38887c478bd9Sstevel@tonic-gate { 38897c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 38907c478bd9Sstevel@tonic-gate 38917c478bd9Sstevel@tonic-gate page_struct_lock(pp); 38927c478bd9Sstevel@tonic-gate /* 38937c478bd9Sstevel@tonic-gate * Acquire the "freemem_lock" for availrmem. 38947c478bd9Sstevel@tonic-gate * If cowcnt or lcknt is already 0 do nothing; i.e., we 38957c478bd9Sstevel@tonic-gate * could be called to unlock even if nothing is locked. This could 38967c478bd9Sstevel@tonic-gate * happen if locked file pages were truncated (removing the lock) 38977c478bd9Sstevel@tonic-gate * and the file was grown again and new pages faulted in; the new 38987c478bd9Sstevel@tonic-gate * pages are unlocked but the segment still thinks they're locked. 38997c478bd9Sstevel@tonic-gate */ 39007c478bd9Sstevel@tonic-gate if (cow) { 39017c478bd9Sstevel@tonic-gate if (pp->p_cowcnt) { 39027c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39037c478bd9Sstevel@tonic-gate pp->p_cowcnt--; 39047c478bd9Sstevel@tonic-gate availrmem++; 39057c478bd9Sstevel@tonic-gate pages_locked--; 39067c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39077c478bd9Sstevel@tonic-gate } 39087c478bd9Sstevel@tonic-gate } else { 39097c478bd9Sstevel@tonic-gate if (pp->p_lckcnt && --pp->p_lckcnt == 0) { 39107c478bd9Sstevel@tonic-gate if (!kernel) { 39117c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39127c478bd9Sstevel@tonic-gate availrmem++; 39137c478bd9Sstevel@tonic-gate pages_locked--; 39147c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39157c478bd9Sstevel@tonic-gate } 39167c478bd9Sstevel@tonic-gate } 39177c478bd9Sstevel@tonic-gate } 39187c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 39197c478bd9Sstevel@tonic-gate } 39207c478bd9Sstevel@tonic-gate 39217c478bd9Sstevel@tonic-gate /* 39227c478bd9Sstevel@tonic-gate * This routine reserves availrmem for npages; 39237c478bd9Sstevel@tonic-gate * flags: KM_NOSLEEP or KM_SLEEP 39247c478bd9Sstevel@tonic-gate * returns 1 on success or 0 on failure 39257c478bd9Sstevel@tonic-gate */ 39267c478bd9Sstevel@tonic-gate int 39277c478bd9Sstevel@tonic-gate page_resv(pgcnt_t npages, uint_t flags) 39287c478bd9Sstevel@tonic-gate { 39297c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39307c478bd9Sstevel@tonic-gate while (availrmem < tune.t_minarmem + npages) { 39317c478bd9Sstevel@tonic-gate if (flags & KM_NOSLEEP) { 39327c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39337c478bd9Sstevel@tonic-gate return (0); 39347c478bd9Sstevel@tonic-gate } 39357c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39367c478bd9Sstevel@tonic-gate page_needfree(npages); 39377c478bd9Sstevel@tonic-gate kmem_reap(); 39387c478bd9Sstevel@tonic-gate delay(hz >> 2); 39397c478bd9Sstevel@tonic-gate page_needfree(-(spgcnt_t)npages); 39407c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39417c478bd9Sstevel@tonic-gate } 39427c478bd9Sstevel@tonic-gate availrmem -= npages; 39437c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39447c478bd9Sstevel@tonic-gate return (1); 39457c478bd9Sstevel@tonic-gate } 39467c478bd9Sstevel@tonic-gate 39477c478bd9Sstevel@tonic-gate /* 39487c478bd9Sstevel@tonic-gate * This routine unreserves availrmem for npages; 39497c478bd9Sstevel@tonic-gate */ 39507c478bd9Sstevel@tonic-gate void 39517c478bd9Sstevel@tonic-gate page_unresv(pgcnt_t npages) 39527c478bd9Sstevel@tonic-gate { 39537c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39547c478bd9Sstevel@tonic-gate availrmem += npages; 39557c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39567c478bd9Sstevel@tonic-gate } 39577c478bd9Sstevel@tonic-gate 39587c478bd9Sstevel@tonic-gate /* 39597c478bd9Sstevel@tonic-gate * See Statement at the beginning of segvn_lockop() regarding 39607c478bd9Sstevel@tonic-gate * the way we handle cowcnts and lckcnts. 39617c478bd9Sstevel@tonic-gate * 39627c478bd9Sstevel@tonic-gate * Transfer cowcnt on 'opp' to cowcnt on 'npp' if the vpage 39637c478bd9Sstevel@tonic-gate * that breaks COW has PROT_WRITE. 39647c478bd9Sstevel@tonic-gate * 39657c478bd9Sstevel@tonic-gate * Note that, we may also break COW in case we are softlocking 39667c478bd9Sstevel@tonic-gate * on read access during physio; 39677c478bd9Sstevel@tonic-gate * in this softlock case, the vpage may not have PROT_WRITE. 39687c478bd9Sstevel@tonic-gate * So, we need to transfer lckcnt on 'opp' to lckcnt on 'npp' 39697c478bd9Sstevel@tonic-gate * if the vpage doesn't have PROT_WRITE. 39707c478bd9Sstevel@tonic-gate * 39717c478bd9Sstevel@tonic-gate * This routine is never called if we are stealing a page 39727c478bd9Sstevel@tonic-gate * in anon_private. 39737c478bd9Sstevel@tonic-gate * 39747c478bd9Sstevel@tonic-gate * The caller subtracted from availrmem for read only mapping. 39757c478bd9Sstevel@tonic-gate * if lckcnt is 1 increment availrmem. 39767c478bd9Sstevel@tonic-gate */ 39777c478bd9Sstevel@tonic-gate void 39787c478bd9Sstevel@tonic-gate page_pp_useclaim( 39797c478bd9Sstevel@tonic-gate page_t *opp, /* original page frame losing lock */ 39807c478bd9Sstevel@tonic-gate page_t *npp, /* new page frame gaining lock */ 39817c478bd9Sstevel@tonic-gate uint_t write_perm) /* set if vpage has PROT_WRITE */ 39827c478bd9Sstevel@tonic-gate { 39837c478bd9Sstevel@tonic-gate int payback = 0; 3984cb15d5d9SPeter Rival int nidx, oidx; 39857c478bd9Sstevel@tonic-gate 39867c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(opp)); 39877c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(npp)); 39887c478bd9Sstevel@tonic-gate 3989cb15d5d9SPeter Rival /* 3990cb15d5d9SPeter Rival * Since we have two pages we probably have two locks. We need to take 3991cb15d5d9SPeter Rival * them in a defined order to avoid deadlocks. It's also possible they 3992cb15d5d9SPeter Rival * both hash to the same lock in which case this is a non-issue. 3993cb15d5d9SPeter Rival */ 3994cb15d5d9SPeter Rival nidx = PAGE_LLOCK_HASH(PP_PAGEROOT(npp)); 3995cb15d5d9SPeter Rival oidx = PAGE_LLOCK_HASH(PP_PAGEROOT(opp)); 3996cb15d5d9SPeter Rival if (nidx < oidx) { 3997cb15d5d9SPeter Rival page_struct_lock(npp); 3998cb15d5d9SPeter Rival page_struct_lock(opp); 3999cb15d5d9SPeter Rival } else if (oidx < nidx) { 4000cb15d5d9SPeter Rival page_struct_lock(opp); 4001cb15d5d9SPeter Rival page_struct_lock(npp); 4002cb15d5d9SPeter Rival } else { /* The pages hash to the same lock */ 4003cb15d5d9SPeter Rival page_struct_lock(npp); 4004cb15d5d9SPeter Rival } 40057c478bd9Sstevel@tonic-gate 40067c478bd9Sstevel@tonic-gate ASSERT(npp->p_cowcnt == 0); 40077c478bd9Sstevel@tonic-gate ASSERT(npp->p_lckcnt == 0); 40087c478bd9Sstevel@tonic-gate 40097c478bd9Sstevel@tonic-gate /* Don't use claim if nothing is locked (see page_pp_unlock above) */ 40107c478bd9Sstevel@tonic-gate if ((write_perm && opp->p_cowcnt != 0) || 40117c478bd9Sstevel@tonic-gate (!write_perm && opp->p_lckcnt != 0)) { 40127c478bd9Sstevel@tonic-gate 40137c478bd9Sstevel@tonic-gate if (write_perm) { 40147c478bd9Sstevel@tonic-gate npp->p_cowcnt++; 40157c478bd9Sstevel@tonic-gate ASSERT(opp->p_cowcnt != 0); 40167c478bd9Sstevel@tonic-gate opp->p_cowcnt--; 40177c478bd9Sstevel@tonic-gate } else { 40187c478bd9Sstevel@tonic-gate 40197c478bd9Sstevel@tonic-gate ASSERT(opp->p_lckcnt != 0); 40207c478bd9Sstevel@tonic-gate 40217c478bd9Sstevel@tonic-gate /* 40227c478bd9Sstevel@tonic-gate * We didn't need availrmem decremented if p_lckcnt on 40237c478bd9Sstevel@tonic-gate * original page is 1. Here, we are unlocking 40247c478bd9Sstevel@tonic-gate * read-only copy belonging to original page and 40257c478bd9Sstevel@tonic-gate * are locking a copy belonging to new page. 40267c478bd9Sstevel@tonic-gate */ 40277c478bd9Sstevel@tonic-gate if (opp->p_lckcnt == 1) 40287c478bd9Sstevel@tonic-gate payback = 1; 40297c478bd9Sstevel@tonic-gate 40307c478bd9Sstevel@tonic-gate npp->p_lckcnt++; 40317c478bd9Sstevel@tonic-gate opp->p_lckcnt--; 40327c478bd9Sstevel@tonic-gate } 40337c478bd9Sstevel@tonic-gate } 40347c478bd9Sstevel@tonic-gate if (payback) { 40357c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 40367c478bd9Sstevel@tonic-gate availrmem++; 40377c478bd9Sstevel@tonic-gate pages_useclaim--; 40387c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40397c478bd9Sstevel@tonic-gate } 4040cb15d5d9SPeter Rival 4041cb15d5d9SPeter Rival if (nidx < oidx) { 4042cb15d5d9SPeter Rival page_struct_unlock(opp); 4043cb15d5d9SPeter Rival page_struct_unlock(npp); 4044cb15d5d9SPeter Rival } else if (oidx < nidx) { 4045cb15d5d9SPeter Rival page_struct_unlock(npp); 4046cb15d5d9SPeter Rival page_struct_unlock(opp); 4047cb15d5d9SPeter Rival } else { /* The pages hash to the same lock */ 4048cb15d5d9SPeter Rival page_struct_unlock(npp); 4049cb15d5d9SPeter Rival } 40507c478bd9Sstevel@tonic-gate } 40517c478bd9Sstevel@tonic-gate 40527c478bd9Sstevel@tonic-gate /* 40537c478bd9Sstevel@tonic-gate * Simple claim adjust functions -- used to support changes in 40547c478bd9Sstevel@tonic-gate * claims due to changes in access permissions. Used by segvn_setprot(). 40557c478bd9Sstevel@tonic-gate */ 40567c478bd9Sstevel@tonic-gate int 40577c478bd9Sstevel@tonic-gate page_addclaim(page_t *pp) 40587c478bd9Sstevel@tonic-gate { 40597c478bd9Sstevel@tonic-gate int r = 0; /* result */ 40607c478bd9Sstevel@tonic-gate 40617c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 40627c478bd9Sstevel@tonic-gate 40637c478bd9Sstevel@tonic-gate page_struct_lock(pp); 40647c478bd9Sstevel@tonic-gate ASSERT(pp->p_lckcnt != 0); 40657c478bd9Sstevel@tonic-gate 40667c478bd9Sstevel@tonic-gate if (pp->p_lckcnt == 1) { 40677c478bd9Sstevel@tonic-gate if (pp->p_cowcnt < (ushort_t)PAGE_LOCK_MAXIMUM) { 40687c478bd9Sstevel@tonic-gate --pp->p_lckcnt; 40697c478bd9Sstevel@tonic-gate r = 1; 40707c478bd9Sstevel@tonic-gate if (++pp->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 40717c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 40727c478bd9Sstevel@tonic-gate "COW lock limit reached on pfn 0x%lx", 40737c478bd9Sstevel@tonic-gate page_pptonum(pp)); 40747c478bd9Sstevel@tonic-gate } 40757c478bd9Sstevel@tonic-gate } 40767c478bd9Sstevel@tonic-gate } else { 40777c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 40787c478bd9Sstevel@tonic-gate if ((availrmem > pages_pp_maximum) && 40797c478bd9Sstevel@tonic-gate (pp->p_cowcnt < (ushort_t)PAGE_LOCK_MAXIMUM)) { 40807c478bd9Sstevel@tonic-gate --availrmem; 40817c478bd9Sstevel@tonic-gate ++pages_claimed; 40827c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40837c478bd9Sstevel@tonic-gate --pp->p_lckcnt; 40847c478bd9Sstevel@tonic-gate r = 1; 40857c478bd9Sstevel@tonic-gate if (++pp->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 40867c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 40877c478bd9Sstevel@tonic-gate "COW lock limit reached on pfn 0x%lx", 40887c478bd9Sstevel@tonic-gate page_pptonum(pp)); 40897c478bd9Sstevel@tonic-gate } 40907c478bd9Sstevel@tonic-gate } else 40917c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40927c478bd9Sstevel@tonic-gate } 40937c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 40947c478bd9Sstevel@tonic-gate return (r); 40957c478bd9Sstevel@tonic-gate } 40967c478bd9Sstevel@tonic-gate 40977c478bd9Sstevel@tonic-gate int 40987c478bd9Sstevel@tonic-gate page_subclaim(page_t *pp) 40997c478bd9Sstevel@tonic-gate { 41007c478bd9Sstevel@tonic-gate int r = 0; 41017c478bd9Sstevel@tonic-gate 41027c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 41037c478bd9Sstevel@tonic-gate 41047c478bd9Sstevel@tonic-gate page_struct_lock(pp); 41057c478bd9Sstevel@tonic-gate ASSERT(pp->p_cowcnt != 0); 41067c478bd9Sstevel@tonic-gate 41077c478bd9Sstevel@tonic-gate if (pp->p_lckcnt) { 41087c478bd9Sstevel@tonic-gate if (pp->p_lckcnt < (ushort_t)PAGE_LOCK_MAXIMUM) { 41097c478bd9Sstevel@tonic-gate r = 1; 41107c478bd9Sstevel@tonic-gate /* 41117c478bd9Sstevel@tonic-gate * for availrmem 41127c478bd9Sstevel@tonic-gate */ 41137c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 41147c478bd9Sstevel@tonic-gate availrmem++; 41157c478bd9Sstevel@tonic-gate pages_claimed--; 41167c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 41177c478bd9Sstevel@tonic-gate 41187c478bd9Sstevel@tonic-gate pp->p_cowcnt--; 41197c478bd9Sstevel@tonic-gate 41207c478bd9Sstevel@tonic-gate if (++pp->p_lckcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 41217c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 41227c478bd9Sstevel@tonic-gate "Page lock limit reached on pfn 0x%lx", 41237c478bd9Sstevel@tonic-gate page_pptonum(pp)); 41247c478bd9Sstevel@tonic-gate } 41257c478bd9Sstevel@tonic-gate } 41267c478bd9Sstevel@tonic-gate } else { 41277c478bd9Sstevel@tonic-gate r = 1; 41287c478bd9Sstevel@tonic-gate pp->p_cowcnt--; 41297c478bd9Sstevel@tonic-gate pp->p_lckcnt++; 41307c478bd9Sstevel@tonic-gate } 41317c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 41327c478bd9Sstevel@tonic-gate return (r); 41337c478bd9Sstevel@tonic-gate } 41347c478bd9Sstevel@tonic-gate 4135cb15d5d9SPeter Rival /* 4136cb15d5d9SPeter Rival * Variant of page_addclaim(), where ppa[] contains the pages of a single large 4137cb15d5d9SPeter Rival * page. 4138cb15d5d9SPeter Rival */ 41397c478bd9Sstevel@tonic-gate int 41407c478bd9Sstevel@tonic-gate page_addclaim_pages(page_t **ppa) 41417c478bd9Sstevel@tonic-gate { 41427c478bd9Sstevel@tonic-gate pgcnt_t lckpgs = 0, pg_idx; 41437c478bd9Sstevel@tonic-gate 41447c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_addclaim_pages); 41457c478bd9Sstevel@tonic-gate 4146cb15d5d9SPeter Rival /* 4147cb15d5d9SPeter Rival * Only need to take the page struct lock on the large page root. 4148cb15d5d9SPeter Rival */ 4149cb15d5d9SPeter Rival page_struct_lock(ppa[0]); 41507c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 41517c478bd9Sstevel@tonic-gate 41527c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(ppa[pg_idx])); 41537c478bd9Sstevel@tonic-gate ASSERT(ppa[pg_idx]->p_lckcnt != 0); 41547c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 4155cb15d5d9SPeter Rival page_struct_unlock(ppa[0]); 41567c478bd9Sstevel@tonic-gate return (0); 41577c478bd9Sstevel@tonic-gate } 41587c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_lckcnt > 1) 41597c478bd9Sstevel@tonic-gate lckpgs++; 41607c478bd9Sstevel@tonic-gate } 41617c478bd9Sstevel@tonic-gate 41627c478bd9Sstevel@tonic-gate if (lckpgs != 0) { 41637c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 41647c478bd9Sstevel@tonic-gate if (availrmem >= pages_pp_maximum + lckpgs) { 41657c478bd9Sstevel@tonic-gate availrmem -= lckpgs; 41667c478bd9Sstevel@tonic-gate pages_claimed += lckpgs; 41677c478bd9Sstevel@tonic-gate } else { 41687c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 4169cb15d5d9SPeter Rival page_struct_unlock(ppa[0]); 41707c478bd9Sstevel@tonic-gate return (0); 41717c478bd9Sstevel@tonic-gate } 41727c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 41737c478bd9Sstevel@tonic-gate } 41747c478bd9Sstevel@tonic-gate 41757c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 41767c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_lckcnt--; 41777c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_cowcnt++; 41787c478bd9Sstevel@tonic-gate } 4179cb15d5d9SPeter Rival page_struct_unlock(ppa[0]); 41807c478bd9Sstevel@tonic-gate return (1); 41817c478bd9Sstevel@tonic-gate } 41827c478bd9Sstevel@tonic-gate 4183cb15d5d9SPeter Rival /* 4184cb15d5d9SPeter Rival * Variant of page_subclaim(), where ppa[] contains the pages of a single large 4185cb15d5d9SPeter Rival * page. 4186cb15d5d9SPeter Rival */ 41877c478bd9Sstevel@tonic-gate int 41887c478bd9Sstevel@tonic-gate page_subclaim_pages(page_t **ppa) 41897c478bd9Sstevel@tonic-gate { 41907c478bd9Sstevel@tonic-gate pgcnt_t ulckpgs = 0, pg_idx; 41917c478bd9Sstevel@tonic-gate 41927c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_subclaim_pages); 41937c478bd9Sstevel@tonic-gate 4194cb15d5d9SPeter Rival /* 4195cb15d5d9SPeter Rival * Only need to take the page struct lock on the large page root. 4196cb15d5d9SPeter Rival */ 4197cb15d5d9SPeter Rival page_struct_lock(ppa[0]); 41987c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 41997c478bd9Sstevel@tonic-gate 42007c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(ppa[pg_idx])); 42017c478bd9Sstevel@tonic-gate ASSERT(ppa[pg_idx]->p_cowcnt != 0); 42027c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_lckcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 4203cb15d5d9SPeter Rival page_struct_unlock(ppa[0]); 42047c478bd9Sstevel@tonic-gate return (0); 42057c478bd9Sstevel@tonic-gate } 42067c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_lckcnt != 0) 42077c478bd9Sstevel@tonic-gate ulckpgs++; 42087c478bd9Sstevel@tonic-gate } 42097c478bd9Sstevel@tonic-gate 42107c478bd9Sstevel@tonic-gate if (ulckpgs != 0) { 42117c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 42127c478bd9Sstevel@tonic-gate availrmem += ulckpgs; 42137c478bd9Sstevel@tonic-gate pages_claimed -= ulckpgs; 42147c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 42157c478bd9Sstevel@tonic-gate } 42167c478bd9Sstevel@tonic-gate 42177c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 42187c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_cowcnt--; 42197c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_lckcnt++; 42207c478bd9Sstevel@tonic-gate 42217c478bd9Sstevel@tonic-gate } 4222cb15d5d9SPeter Rival page_struct_unlock(ppa[0]); 42237c478bd9Sstevel@tonic-gate return (1); 42247c478bd9Sstevel@tonic-gate } 42257c478bd9Sstevel@tonic-gate 42267c478bd9Sstevel@tonic-gate page_t * 42277c478bd9Sstevel@tonic-gate page_numtopp(pfn_t pfnum, se_t se) 42287c478bd9Sstevel@tonic-gate { 42297c478bd9Sstevel@tonic-gate page_t *pp; 42307c478bd9Sstevel@tonic-gate 42317c478bd9Sstevel@tonic-gate retry: 42327c478bd9Sstevel@tonic-gate pp = page_numtopp_nolock(pfnum); 42337c478bd9Sstevel@tonic-gate if (pp == NULL) { 42347c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 42357c478bd9Sstevel@tonic-gate } 42367c478bd9Sstevel@tonic-gate 42377c478bd9Sstevel@tonic-gate /* 42387c478bd9Sstevel@tonic-gate * Acquire the appropriate lock on the page. 42397c478bd9Sstevel@tonic-gate */ 42407c478bd9Sstevel@tonic-gate while (!page_lock(pp, se, (kmutex_t *)NULL, P_RECLAIM)) { 42417c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) 42427c478bd9Sstevel@tonic-gate goto retry; 42437c478bd9Sstevel@tonic-gate continue; 42447c478bd9Sstevel@tonic-gate } 42457c478bd9Sstevel@tonic-gate 42467c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) { 42477c478bd9Sstevel@tonic-gate page_unlock(pp); 42487c478bd9Sstevel@tonic-gate goto retry; 42497c478bd9Sstevel@tonic-gate } 42507c478bd9Sstevel@tonic-gate 42517c478bd9Sstevel@tonic-gate return (pp); 42527c478bd9Sstevel@tonic-gate } 42537c478bd9Sstevel@tonic-gate 42547c478bd9Sstevel@tonic-gate page_t * 42557c478bd9Sstevel@tonic-gate page_numtopp_noreclaim(pfn_t pfnum, se_t se) 42567c478bd9Sstevel@tonic-gate { 42577c478bd9Sstevel@tonic-gate page_t *pp; 42587c478bd9Sstevel@tonic-gate 42597c478bd9Sstevel@tonic-gate retry: 42607c478bd9Sstevel@tonic-gate pp = page_numtopp_nolock(pfnum); 42617c478bd9Sstevel@tonic-gate if (pp == NULL) { 42627c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 42637c478bd9Sstevel@tonic-gate } 42647c478bd9Sstevel@tonic-gate 42657c478bd9Sstevel@tonic-gate /* 42667c478bd9Sstevel@tonic-gate * Acquire the appropriate lock on the page. 42677c478bd9Sstevel@tonic-gate */ 42687c478bd9Sstevel@tonic-gate while (!page_lock(pp, se, (kmutex_t *)NULL, P_NO_RECLAIM)) { 42697c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) 42707c478bd9Sstevel@tonic-gate goto retry; 42717c478bd9Sstevel@tonic-gate continue; 42727c478bd9Sstevel@tonic-gate } 42737c478bd9Sstevel@tonic-gate 42747c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) { 42757c478bd9Sstevel@tonic-gate page_unlock(pp); 42767c478bd9Sstevel@tonic-gate goto retry; 42777c478bd9Sstevel@tonic-gate } 42787c478bd9Sstevel@tonic-gate 42797c478bd9Sstevel@tonic-gate return (pp); 42807c478bd9Sstevel@tonic-gate } 42817c478bd9Sstevel@tonic-gate 42827c478bd9Sstevel@tonic-gate /* 42837c478bd9Sstevel@tonic-gate * This routine is like page_numtopp, but will only return page structs 42847c478bd9Sstevel@tonic-gate * for pages which are ok for loading into hardware using the page struct. 42857c478bd9Sstevel@tonic-gate */ 42867c478bd9Sstevel@tonic-gate page_t * 42877c478bd9Sstevel@tonic-gate page_numtopp_nowait(pfn_t pfnum, se_t se) 42887c478bd9Sstevel@tonic-gate { 42897c478bd9Sstevel@tonic-gate page_t *pp; 42907c478bd9Sstevel@tonic-gate 42917c478bd9Sstevel@tonic-gate retry: 42927c478bd9Sstevel@tonic-gate pp = page_numtopp_nolock(pfnum); 42937c478bd9Sstevel@tonic-gate if (pp == NULL) { 42947c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 42957c478bd9Sstevel@tonic-gate } 42967c478bd9Sstevel@tonic-gate 42977c478bd9Sstevel@tonic-gate /* 42987c478bd9Sstevel@tonic-gate * Try to acquire the appropriate lock on the page. 42997c478bd9Sstevel@tonic-gate */ 43007c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) 43017c478bd9Sstevel@tonic-gate pp = NULL; 43027c478bd9Sstevel@tonic-gate else { 43037c478bd9Sstevel@tonic-gate if (!page_trylock(pp, se)) 43047c478bd9Sstevel@tonic-gate pp = NULL; 43057c478bd9Sstevel@tonic-gate else { 43067c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) { 43077c478bd9Sstevel@tonic-gate page_unlock(pp); 43087c478bd9Sstevel@tonic-gate goto retry; 43097c478bd9Sstevel@tonic-gate } 43107c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 43117c478bd9Sstevel@tonic-gate page_unlock(pp); 43127c478bd9Sstevel@tonic-gate pp = NULL; 43137c478bd9Sstevel@tonic-gate } 43147c478bd9Sstevel@tonic-gate } 43157c478bd9Sstevel@tonic-gate } 43167c478bd9Sstevel@tonic-gate return (pp); 43177c478bd9Sstevel@tonic-gate } 43187c478bd9Sstevel@tonic-gate 43197c478bd9Sstevel@tonic-gate /* 43207c478bd9Sstevel@tonic-gate * Returns a count of dirty pages that are in the process 43217c478bd9Sstevel@tonic-gate * of being written out. If 'cleanit' is set, try to push the page. 43227c478bd9Sstevel@tonic-gate */ 43237c478bd9Sstevel@tonic-gate pgcnt_t 43247c478bd9Sstevel@tonic-gate page_busy(int cleanit) 43257c478bd9Sstevel@tonic-gate { 43267c478bd9Sstevel@tonic-gate page_t *page0 = page_first(); 43277c478bd9Sstevel@tonic-gate page_t *pp = page0; 43287c478bd9Sstevel@tonic-gate pgcnt_t nppbusy = 0; 43297c478bd9Sstevel@tonic-gate u_offset_t off; 43307c478bd9Sstevel@tonic-gate 43317c478bd9Sstevel@tonic-gate do { 43327c478bd9Sstevel@tonic-gate vnode_t *vp = pp->p_vnode; 43337c478bd9Sstevel@tonic-gate /* 43347c478bd9Sstevel@tonic-gate * A page is a candidate for syncing if it is: 43357c478bd9Sstevel@tonic-gate * 43367c478bd9Sstevel@tonic-gate * (a) On neither the freelist nor the cachelist 43377c478bd9Sstevel@tonic-gate * (b) Hashed onto a vnode 43387c478bd9Sstevel@tonic-gate * (c) Not a kernel page 43397c478bd9Sstevel@tonic-gate * (d) Dirty 43407c478bd9Sstevel@tonic-gate * (e) Not part of a swapfile 43417c478bd9Sstevel@tonic-gate * (f) a page which belongs to a real vnode; eg has a non-null 43427c478bd9Sstevel@tonic-gate * v_vfsp pointer. 43437c478bd9Sstevel@tonic-gate * (g) Backed by a filesystem which doesn't have a 43447c478bd9Sstevel@tonic-gate * stubbed-out sync operation 43457c478bd9Sstevel@tonic-gate */ 4346ad23a2dbSjohansen if (!PP_ISFREE(pp) && vp != NULL && !VN_ISKAS(vp) && 43477c478bd9Sstevel@tonic-gate hat_ismod(pp) && !IS_SWAPVP(vp) && vp->v_vfsp != NULL && 43487c478bd9Sstevel@tonic-gate vfs_can_sync(vp->v_vfsp)) { 43497c478bd9Sstevel@tonic-gate nppbusy++; 43507c478bd9Sstevel@tonic-gate 43517c478bd9Sstevel@tonic-gate if (!cleanit) 43527c478bd9Sstevel@tonic-gate continue; 43537c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) 43547c478bd9Sstevel@tonic-gate continue; 43557c478bd9Sstevel@tonic-gate 43567c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp) || vp == NULL || IS_SWAPVP(vp) || 43577c478bd9Sstevel@tonic-gate pp->p_lckcnt != 0 || pp->p_cowcnt != 0 || 43587c478bd9Sstevel@tonic-gate !(hat_pagesync(pp, 43597c478bd9Sstevel@tonic-gate HAT_SYNC_DONTZERO | HAT_SYNC_STOPON_MOD) & P_MOD)) { 43607c478bd9Sstevel@tonic-gate page_unlock(pp); 43617c478bd9Sstevel@tonic-gate continue; 43627c478bd9Sstevel@tonic-gate } 43637c478bd9Sstevel@tonic-gate off = pp->p_offset; 43647c478bd9Sstevel@tonic-gate VN_HOLD(vp); 43657c478bd9Sstevel@tonic-gate page_unlock(pp); 43667c478bd9Sstevel@tonic-gate (void) VOP_PUTPAGE(vp, off, PAGESIZE, 4367da6c28aaSamw B_ASYNC | B_FREE, kcred, NULL); 43687c478bd9Sstevel@tonic-gate VN_RELE(vp); 43697c478bd9Sstevel@tonic-gate } 43707c478bd9Sstevel@tonic-gate } while ((pp = page_next(pp)) != page0); 43717c478bd9Sstevel@tonic-gate 43727c478bd9Sstevel@tonic-gate return (nppbusy); 43737c478bd9Sstevel@tonic-gate } 43747c478bd9Sstevel@tonic-gate 43757c478bd9Sstevel@tonic-gate void page_invalidate_pages(void); 43767c478bd9Sstevel@tonic-gate 43777c478bd9Sstevel@tonic-gate /* 43787c478bd9Sstevel@tonic-gate * callback handler to vm sub-system 43797c478bd9Sstevel@tonic-gate * 43807c478bd9Sstevel@tonic-gate * callers make sure no recursive entries to this func. 43817c478bd9Sstevel@tonic-gate */ 43827c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 43837c478bd9Sstevel@tonic-gate boolean_t 43847c478bd9Sstevel@tonic-gate callb_vm_cpr(void *arg, int code) 43857c478bd9Sstevel@tonic-gate { 43867c478bd9Sstevel@tonic-gate if (code == CB_CODE_CPR_CHKPT) 43877c478bd9Sstevel@tonic-gate page_invalidate_pages(); 43887c478bd9Sstevel@tonic-gate return (B_TRUE); 43897c478bd9Sstevel@tonic-gate } 43907c478bd9Sstevel@tonic-gate 43917c478bd9Sstevel@tonic-gate /* 43927c478bd9Sstevel@tonic-gate * Invalidate all pages of the system. 43937c478bd9Sstevel@tonic-gate * It shouldn't be called until all user page activities are all stopped. 43947c478bd9Sstevel@tonic-gate */ 43957c478bd9Sstevel@tonic-gate void 43967c478bd9Sstevel@tonic-gate page_invalidate_pages() 43977c478bd9Sstevel@tonic-gate { 43987c478bd9Sstevel@tonic-gate page_t *pp; 43997c478bd9Sstevel@tonic-gate page_t *page0; 44007c478bd9Sstevel@tonic-gate pgcnt_t nbusypages; 44017c478bd9Sstevel@tonic-gate int retry = 0; 44027c478bd9Sstevel@tonic-gate const int MAXRETRIES = 4; 44037c478bd9Sstevel@tonic-gate top: 44047c478bd9Sstevel@tonic-gate /* 44058b464eb8Smec * Flush dirty pages and destroy the clean ones. 44067c478bd9Sstevel@tonic-gate */ 44077c478bd9Sstevel@tonic-gate nbusypages = 0; 44087c478bd9Sstevel@tonic-gate 44097c478bd9Sstevel@tonic-gate pp = page0 = page_first(); 44107c478bd9Sstevel@tonic-gate do { 44117c478bd9Sstevel@tonic-gate struct vnode *vp; 44127c478bd9Sstevel@tonic-gate u_offset_t offset; 44137c478bd9Sstevel@tonic-gate int mod; 44147c478bd9Sstevel@tonic-gate 44157c478bd9Sstevel@tonic-gate /* 44167c478bd9Sstevel@tonic-gate * skip the page if it has no vnode or the page associated 44177c478bd9Sstevel@tonic-gate * with the kernel vnode or prom allocated kernel mem. 44187c478bd9Sstevel@tonic-gate */ 4419ad23a2dbSjohansen if ((vp = pp->p_vnode) == NULL || VN_ISKAS(vp)) 44207c478bd9Sstevel@tonic-gate continue; 44217c478bd9Sstevel@tonic-gate 44227c478bd9Sstevel@tonic-gate /* 44237c478bd9Sstevel@tonic-gate * skip the page which is already free invalidated. 44247c478bd9Sstevel@tonic-gate */ 44257c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp) && PP_ISAGED(pp)) 44267c478bd9Sstevel@tonic-gate continue; 44277c478bd9Sstevel@tonic-gate 44287c478bd9Sstevel@tonic-gate /* 44297c478bd9Sstevel@tonic-gate * skip pages that are already locked or can't be "exclusively" 44307c478bd9Sstevel@tonic-gate * locked or are already free. After we lock the page, check 44312e0ea4c4SMichael Corcoran * the free and age bits again to be sure it's not destroyed 44327c478bd9Sstevel@tonic-gate * yet. 44337c478bd9Sstevel@tonic-gate * To achieve max. parallelization, we use page_trylock instead 44347c478bd9Sstevel@tonic-gate * of page_lock so that we don't get block on individual pages 44357c478bd9Sstevel@tonic-gate * while we have thousands of other pages to process. 44367c478bd9Sstevel@tonic-gate */ 44377c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) { 44387c478bd9Sstevel@tonic-gate nbusypages++; 44397c478bd9Sstevel@tonic-gate continue; 44407c478bd9Sstevel@tonic-gate } else if (PP_ISFREE(pp)) { 44417c478bd9Sstevel@tonic-gate if (!PP_ISAGED(pp)) { 44427c478bd9Sstevel@tonic-gate page_destroy_free(pp); 44437c478bd9Sstevel@tonic-gate } else { 44447c478bd9Sstevel@tonic-gate page_unlock(pp); 44457c478bd9Sstevel@tonic-gate } 44467c478bd9Sstevel@tonic-gate continue; 44477c478bd9Sstevel@tonic-gate } 44487c478bd9Sstevel@tonic-gate /* 44497c478bd9Sstevel@tonic-gate * Is this page involved in some I/O? shared? 44507c478bd9Sstevel@tonic-gate * 44517c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired to 44527c478bd9Sstevel@tonic-gate * examine these fields since the page has an 44537c478bd9Sstevel@tonic-gate * "exclusive" lock. 44547c478bd9Sstevel@tonic-gate */ 44557c478bd9Sstevel@tonic-gate if (pp->p_lckcnt != 0 || pp->p_cowcnt != 0) { 44567c478bd9Sstevel@tonic-gate page_unlock(pp); 44577c478bd9Sstevel@tonic-gate continue; 44587c478bd9Sstevel@tonic-gate } 44597c478bd9Sstevel@tonic-gate 44607c478bd9Sstevel@tonic-gate if (vp->v_type == VCHR) { 44617c478bd9Sstevel@tonic-gate panic("vp->v_type == VCHR"); 44627c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 44637c478bd9Sstevel@tonic-gate } 44647c478bd9Sstevel@tonic-gate 44657c478bd9Sstevel@tonic-gate if (!page_try_demote_pages(pp)) { 44667c478bd9Sstevel@tonic-gate page_unlock(pp); 44677c478bd9Sstevel@tonic-gate continue; 44687c478bd9Sstevel@tonic-gate } 44697c478bd9Sstevel@tonic-gate 44707c478bd9Sstevel@tonic-gate /* 44717c478bd9Sstevel@tonic-gate * Check the modified bit. Leave the bits alone in hardware 44727c478bd9Sstevel@tonic-gate * (they will be modified if we do the putpage). 44737c478bd9Sstevel@tonic-gate */ 44747c478bd9Sstevel@tonic-gate mod = (hat_pagesync(pp, HAT_SYNC_DONTZERO | HAT_SYNC_STOPON_MOD) 44756e4dd838Smec & P_MOD); 44767c478bd9Sstevel@tonic-gate if (mod) { 44777c478bd9Sstevel@tonic-gate offset = pp->p_offset; 44787c478bd9Sstevel@tonic-gate /* 44797c478bd9Sstevel@tonic-gate * Hold the vnode before releasing the page lock 44807c478bd9Sstevel@tonic-gate * to prevent it from being freed and re-used by 44817c478bd9Sstevel@tonic-gate * some other thread. 44827c478bd9Sstevel@tonic-gate */ 44837c478bd9Sstevel@tonic-gate VN_HOLD(vp); 44847c478bd9Sstevel@tonic-gate page_unlock(pp); 44857c478bd9Sstevel@tonic-gate /* 44867c478bd9Sstevel@tonic-gate * No error return is checked here. Callers such as 44877c478bd9Sstevel@tonic-gate * cpr deals with the dirty pages at the dump time 44887c478bd9Sstevel@tonic-gate * if this putpage fails. 44897c478bd9Sstevel@tonic-gate */ 44907c478bd9Sstevel@tonic-gate (void) VOP_PUTPAGE(vp, offset, PAGESIZE, B_INVAL, 4491da6c28aaSamw kcred, NULL); 44927c478bd9Sstevel@tonic-gate VN_RELE(vp); 44937c478bd9Sstevel@tonic-gate } else { 44942e0ea4c4SMichael Corcoran /*LINTED: constant in conditional context*/ 44952e0ea4c4SMichael Corcoran VN_DISPOSE(pp, B_INVAL, 0, kcred); 44967c478bd9Sstevel@tonic-gate } 44977c478bd9Sstevel@tonic-gate } while ((pp = page_next(pp)) != page0); 44987c478bd9Sstevel@tonic-gate if (nbusypages && retry++ < MAXRETRIES) { 44997c478bd9Sstevel@tonic-gate delay(1); 45007c478bd9Sstevel@tonic-gate goto top; 45017c478bd9Sstevel@tonic-gate } 45027c478bd9Sstevel@tonic-gate } 45037c478bd9Sstevel@tonic-gate 45047c478bd9Sstevel@tonic-gate /* 45057c478bd9Sstevel@tonic-gate * Replace the page "old" with the page "new" on the page hash and vnode lists 45067c478bd9Sstevel@tonic-gate * 4507da6c28aaSamw * the replacement must be done in place, ie the equivalent sequence: 45087c478bd9Sstevel@tonic-gate * 45097c478bd9Sstevel@tonic-gate * vp = old->p_vnode; 45107c478bd9Sstevel@tonic-gate * off = old->p_offset; 45117c478bd9Sstevel@tonic-gate * page_do_hashout(old) 45127c478bd9Sstevel@tonic-gate * page_do_hashin(new, vp, off) 45137c478bd9Sstevel@tonic-gate * 45147c478bd9Sstevel@tonic-gate * doesn't work, since 45157c478bd9Sstevel@tonic-gate * 1) if old is the only page on the vnode, the v_pages list has a window 45167c478bd9Sstevel@tonic-gate * where it looks empty. This will break file system assumptions. 45177c478bd9Sstevel@tonic-gate * and 45187c478bd9Sstevel@tonic-gate * 2) pvn_vplist_dirty() can't deal with pages moving on the v_pages list. 45197c478bd9Sstevel@tonic-gate */ 45207c478bd9Sstevel@tonic-gate static void 45217c478bd9Sstevel@tonic-gate page_do_relocate_hash(page_t *new, page_t *old) 45227c478bd9Sstevel@tonic-gate { 45237c478bd9Sstevel@tonic-gate page_t **hash_list; 45247c478bd9Sstevel@tonic-gate vnode_t *vp = old->p_vnode; 45257c478bd9Sstevel@tonic-gate kmutex_t *sep; 45267c478bd9Sstevel@tonic-gate 45277c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(old)); 45287c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(new)); 45297c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 45307c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(page_vnode_mutex(vp))); 45317c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(PAGE_HASH_MUTEX(PAGE_HASH_FUNC(vp, old->p_offset)))); 45327c478bd9Sstevel@tonic-gate 45337c478bd9Sstevel@tonic-gate /* 45347c478bd9Sstevel@tonic-gate * First find old page on the page hash list 45357c478bd9Sstevel@tonic-gate */ 45367c478bd9Sstevel@tonic-gate hash_list = &page_hash[PAGE_HASH_FUNC(vp, old->p_offset)]; 45377c478bd9Sstevel@tonic-gate 45387c478bd9Sstevel@tonic-gate for (;;) { 45397c478bd9Sstevel@tonic-gate if (*hash_list == old) 45407c478bd9Sstevel@tonic-gate break; 45417c478bd9Sstevel@tonic-gate if (*hash_list == NULL) { 45427c478bd9Sstevel@tonic-gate panic("page_do_hashout"); 45437c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 45447c478bd9Sstevel@tonic-gate } 45457c478bd9Sstevel@tonic-gate hash_list = &(*hash_list)->p_hash; 45467c478bd9Sstevel@tonic-gate } 45477c478bd9Sstevel@tonic-gate 45487c478bd9Sstevel@tonic-gate /* 45497c478bd9Sstevel@tonic-gate * update new and replace old with new on the page hash list 45507c478bd9Sstevel@tonic-gate */ 45517c478bd9Sstevel@tonic-gate new->p_vnode = old->p_vnode; 45527c478bd9Sstevel@tonic-gate new->p_offset = old->p_offset; 45537c478bd9Sstevel@tonic-gate new->p_hash = old->p_hash; 45547c478bd9Sstevel@tonic-gate *hash_list = new; 45557c478bd9Sstevel@tonic-gate 45567c478bd9Sstevel@tonic-gate if ((new->p_vnode->v_flag & VISSWAP) != 0) 45577c478bd9Sstevel@tonic-gate PP_SETSWAP(new); 45587c478bd9Sstevel@tonic-gate 45597c478bd9Sstevel@tonic-gate /* 45607c478bd9Sstevel@tonic-gate * replace old with new on the vnode's page list 45617c478bd9Sstevel@tonic-gate */ 45627c478bd9Sstevel@tonic-gate if (old->p_vpnext == old) { 45637c478bd9Sstevel@tonic-gate new->p_vpnext = new; 45647c478bd9Sstevel@tonic-gate new->p_vpprev = new; 45657c478bd9Sstevel@tonic-gate } else { 45667c478bd9Sstevel@tonic-gate new->p_vpnext = old->p_vpnext; 45677c478bd9Sstevel@tonic-gate new->p_vpprev = old->p_vpprev; 45687c478bd9Sstevel@tonic-gate new->p_vpnext->p_vpprev = new; 45697c478bd9Sstevel@tonic-gate new->p_vpprev->p_vpnext = new; 45707c478bd9Sstevel@tonic-gate } 45717c478bd9Sstevel@tonic-gate if (vp->v_pages == old) 45727c478bd9Sstevel@tonic-gate vp->v_pages = new; 45737c478bd9Sstevel@tonic-gate 45747c478bd9Sstevel@tonic-gate /* 45757c478bd9Sstevel@tonic-gate * clear out the old page 45767c478bd9Sstevel@tonic-gate */ 45777c478bd9Sstevel@tonic-gate old->p_hash = NULL; 45787c478bd9Sstevel@tonic-gate old->p_vpnext = NULL; 45797c478bd9Sstevel@tonic-gate old->p_vpprev = NULL; 45807c478bd9Sstevel@tonic-gate old->p_vnode = NULL; 45817c478bd9Sstevel@tonic-gate PP_CLRSWAP(old); 45827c478bd9Sstevel@tonic-gate old->p_offset = (u_offset_t)-1; 45839d0d62adSJason Beloro page_clr_all_props(old); 45847c478bd9Sstevel@tonic-gate 45857c478bd9Sstevel@tonic-gate /* 45867c478bd9Sstevel@tonic-gate * Wake up processes waiting for this page. The page's 45877c478bd9Sstevel@tonic-gate * identity has been changed, and is probably not the 45887c478bd9Sstevel@tonic-gate * desired page any longer. 45897c478bd9Sstevel@tonic-gate */ 45907c478bd9Sstevel@tonic-gate sep = page_se_mutex(old); 45917c478bd9Sstevel@tonic-gate mutex_enter(sep); 459242787a71Sstans old->p_selock &= ~SE_EWANTED; 45937c478bd9Sstevel@tonic-gate if (CV_HAS_WAITERS(&old->p_cv)) 45947c478bd9Sstevel@tonic-gate cv_broadcast(&old->p_cv); 45957c478bd9Sstevel@tonic-gate mutex_exit(sep); 45967c478bd9Sstevel@tonic-gate } 45977c478bd9Sstevel@tonic-gate 45987c478bd9Sstevel@tonic-gate /* 45997c478bd9Sstevel@tonic-gate * This function moves the identity of page "pp_old" to page "pp_new". 46007c478bd9Sstevel@tonic-gate * Both pages must be locked on entry. "pp_new" is free, has no identity, 46017c478bd9Sstevel@tonic-gate * and need not be hashed out from anywhere. 46027c478bd9Sstevel@tonic-gate */ 46037c478bd9Sstevel@tonic-gate void 46047c478bd9Sstevel@tonic-gate page_relocate_hash(page_t *pp_new, page_t *pp_old) 46057c478bd9Sstevel@tonic-gate { 46067c478bd9Sstevel@tonic-gate vnode_t *vp = pp_old->p_vnode; 46077c478bd9Sstevel@tonic-gate u_offset_t off = pp_old->p_offset; 46087c478bd9Sstevel@tonic-gate kmutex_t *phm, *vphm; 46097c478bd9Sstevel@tonic-gate 46107c478bd9Sstevel@tonic-gate /* 46117c478bd9Sstevel@tonic-gate * Rehash two pages 46127c478bd9Sstevel@tonic-gate */ 46137c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp_old)); 46147c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp_new)); 46157c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 46167c478bd9Sstevel@tonic-gate ASSERT(pp_new->p_vnode == NULL); 46177c478bd9Sstevel@tonic-gate 46187c478bd9Sstevel@tonic-gate /* 46197c478bd9Sstevel@tonic-gate * hashout then hashin while holding the mutexes 46207c478bd9Sstevel@tonic-gate */ 46217c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(PAGE_HASH_FUNC(vp, off)); 46227c478bd9Sstevel@tonic-gate mutex_enter(phm); 46237c478bd9Sstevel@tonic-gate vphm = page_vnode_mutex(vp); 46247c478bd9Sstevel@tonic-gate mutex_enter(vphm); 46257c478bd9Sstevel@tonic-gate 46267c478bd9Sstevel@tonic-gate page_do_relocate_hash(pp_new, pp_old); 46277c478bd9Sstevel@tonic-gate 4628c7531c7fSPrakash Sangappa /* The following comment preserved from page_flip(). */ 4629c7531c7fSPrakash Sangappa pp_new->p_fsdata = pp_old->p_fsdata; 4630c7531c7fSPrakash Sangappa pp_old->p_fsdata = 0; 46317c478bd9Sstevel@tonic-gate mutex_exit(vphm); 46327c478bd9Sstevel@tonic-gate mutex_exit(phm); 46337c478bd9Sstevel@tonic-gate 46347c478bd9Sstevel@tonic-gate /* 46357c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt and 46367c478bd9Sstevel@tonic-gate * cowcnt since the page has an "exclusive" lock. 46377c478bd9Sstevel@tonic-gate */ 46387c478bd9Sstevel@tonic-gate ASSERT(pp_new->p_lckcnt == 0); 46397c478bd9Sstevel@tonic-gate ASSERT(pp_new->p_cowcnt == 0); 46407c478bd9Sstevel@tonic-gate pp_new->p_lckcnt = pp_old->p_lckcnt; 46417c478bd9Sstevel@tonic-gate pp_new->p_cowcnt = pp_old->p_cowcnt; 46427c478bd9Sstevel@tonic-gate pp_old->p_lckcnt = pp_old->p_cowcnt = 0; 46437c478bd9Sstevel@tonic-gate 46447c478bd9Sstevel@tonic-gate } 46457c478bd9Sstevel@tonic-gate 46467c478bd9Sstevel@tonic-gate /* 46477c478bd9Sstevel@tonic-gate * Helper routine used to lock all remaining members of a 46487c478bd9Sstevel@tonic-gate * large page. The caller is responsible for passing in a locked 46497c478bd9Sstevel@tonic-gate * pp. If pp is a large page, then it succeeds in locking all the 46507c478bd9Sstevel@tonic-gate * remaining constituent pages or it returns with only the 46517c478bd9Sstevel@tonic-gate * original page locked. 46527c478bd9Sstevel@tonic-gate * 46537c478bd9Sstevel@tonic-gate * Returns 1 on success, 0 on failure. 46547c478bd9Sstevel@tonic-gate * 4655da6c28aaSamw * If success is returned this routine guarantees p_szc for all constituent 46567c478bd9Sstevel@tonic-gate * pages of a large page pp belongs to can't change. To achieve this we 46577c478bd9Sstevel@tonic-gate * recheck szc of pp after locking all constituent pages and retry if szc 46587c478bd9Sstevel@tonic-gate * changed (it could only decrease). Since hat_page_demote() needs an EXCL 46597c478bd9Sstevel@tonic-gate * lock on one of constituent pages it can't be running after all constituent 46607c478bd9Sstevel@tonic-gate * pages are locked. hat_page_demote() with a lock on a constituent page 46617c478bd9Sstevel@tonic-gate * outside of this large page (i.e. pp belonged to a larger large page) is 46627c478bd9Sstevel@tonic-gate * already done with all constituent pages of pp since the root's p_szc is 4663da6c28aaSamw * changed last. Therefore no need to synchronize with hat_page_demote() that 46647c478bd9Sstevel@tonic-gate * locked a constituent page outside of pp's current large page. 46657c478bd9Sstevel@tonic-gate */ 46667c478bd9Sstevel@tonic-gate #ifdef DEBUG 46677c478bd9Sstevel@tonic-gate uint32_t gpg_trylock_mtbf = 0; 46687c478bd9Sstevel@tonic-gate #endif 46697c478bd9Sstevel@tonic-gate 46707c478bd9Sstevel@tonic-gate int 46717c478bd9Sstevel@tonic-gate group_page_trylock(page_t *pp, se_t se) 46727c478bd9Sstevel@tonic-gate { 46737c478bd9Sstevel@tonic-gate page_t *tpp; 46747c478bd9Sstevel@tonic-gate pgcnt_t npgs, i, j; 46757c478bd9Sstevel@tonic-gate uint_t pszc = pp->p_szc; 46767c478bd9Sstevel@tonic-gate 46777c478bd9Sstevel@tonic-gate #ifdef DEBUG 46787c478bd9Sstevel@tonic-gate if (gpg_trylock_mtbf && !(gethrtime() % gpg_trylock_mtbf)) { 46797c478bd9Sstevel@tonic-gate return (0); 46807c478bd9Sstevel@tonic-gate } 46817c478bd9Sstevel@tonic-gate #endif 46827c478bd9Sstevel@tonic-gate 46837c478bd9Sstevel@tonic-gate if (pp != PP_GROUPLEADER(pp, pszc)) { 46847c478bd9Sstevel@tonic-gate return (0); 46857c478bd9Sstevel@tonic-gate } 46867c478bd9Sstevel@tonic-gate 46877c478bd9Sstevel@tonic-gate retry: 46887c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED_SE(pp, se)); 46897c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 46907c478bd9Sstevel@tonic-gate if (pszc == 0) { 46917c478bd9Sstevel@tonic-gate return (1); 46927c478bd9Sstevel@tonic-gate } 46937c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(pszc); 46947c478bd9Sstevel@tonic-gate tpp = pp + 1; 46957c478bd9Sstevel@tonic-gate for (i = 1; i < npgs; i++, tpp++) { 46967c478bd9Sstevel@tonic-gate if (!page_trylock(tpp, se)) { 46977c478bd9Sstevel@tonic-gate tpp = pp + 1; 46987c478bd9Sstevel@tonic-gate for (j = 1; j < i; j++, tpp++) { 46997c478bd9Sstevel@tonic-gate page_unlock(tpp); 47007c478bd9Sstevel@tonic-gate } 47017c478bd9Sstevel@tonic-gate return (0); 47027c478bd9Sstevel@tonic-gate } 47037c478bd9Sstevel@tonic-gate } 47047c478bd9Sstevel@tonic-gate if (pp->p_szc != pszc) { 47057c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc < pszc); 4706ad23a2dbSjohansen ASSERT(pp->p_vnode != NULL && !PP_ISKAS(pp) && 47077c478bd9Sstevel@tonic-gate !IS_SWAPFSVP(pp->p_vnode)); 47087c478bd9Sstevel@tonic-gate tpp = pp + 1; 47097c478bd9Sstevel@tonic-gate for (i = 1; i < npgs; i++, tpp++) { 47107c478bd9Sstevel@tonic-gate page_unlock(tpp); 47117c478bd9Sstevel@tonic-gate } 47127c478bd9Sstevel@tonic-gate pszc = pp->p_szc; 47137c478bd9Sstevel@tonic-gate goto retry; 47147c478bd9Sstevel@tonic-gate } 47157c478bd9Sstevel@tonic-gate return (1); 47167c478bd9Sstevel@tonic-gate } 47177c478bd9Sstevel@tonic-gate 47187c478bd9Sstevel@tonic-gate void 47197c478bd9Sstevel@tonic-gate group_page_unlock(page_t *pp) 47207c478bd9Sstevel@tonic-gate { 47217c478bd9Sstevel@tonic-gate page_t *tpp; 47227c478bd9Sstevel@tonic-gate pgcnt_t npgs, i; 47237c478bd9Sstevel@tonic-gate 47247c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 47257c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 47267c478bd9Sstevel@tonic-gate ASSERT(pp == PP_PAGEROOT(pp)); 47277c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(pp->p_szc); 47287c478bd9Sstevel@tonic-gate for (i = 1, tpp = pp + 1; i < npgs; i++, tpp++) { 47297c478bd9Sstevel@tonic-gate page_unlock(tpp); 47307c478bd9Sstevel@tonic-gate } 47317c478bd9Sstevel@tonic-gate } 47327c478bd9Sstevel@tonic-gate 47337c478bd9Sstevel@tonic-gate /* 47347c478bd9Sstevel@tonic-gate * returns 47357c478bd9Sstevel@tonic-gate * 0 : on success and *nrelocp is number of relocated PAGESIZE pages 47367c478bd9Sstevel@tonic-gate * ERANGE : this is not a base page 47377c478bd9Sstevel@tonic-gate * EBUSY : failure to get locks on the page/pages 47387c478bd9Sstevel@tonic-gate * ENOMEM : failure to obtain replacement pages 47397c478bd9Sstevel@tonic-gate * EAGAIN : OBP has not yet completed its boot-time handoff to the kernel 47408b464eb8Smec * EIO : An error occurred while trying to copy the page data 47417c478bd9Sstevel@tonic-gate * 47427c478bd9Sstevel@tonic-gate * Return with all constituent members of target and replacement 47437c478bd9Sstevel@tonic-gate * SE_EXCL locked. It is the callers responsibility to drop the 47447c478bd9Sstevel@tonic-gate * locks. 47457c478bd9Sstevel@tonic-gate */ 47467c478bd9Sstevel@tonic-gate int 47477c478bd9Sstevel@tonic-gate do_page_relocate( 47487c478bd9Sstevel@tonic-gate page_t **target, 47497c478bd9Sstevel@tonic-gate page_t **replacement, 47507c478bd9Sstevel@tonic-gate int grouplock, 47517c478bd9Sstevel@tonic-gate spgcnt_t *nrelocp, 47527c478bd9Sstevel@tonic-gate lgrp_t *lgrp) 47537c478bd9Sstevel@tonic-gate { 47547c478bd9Sstevel@tonic-gate page_t *first_repl; 47557c478bd9Sstevel@tonic-gate page_t *repl; 47567c478bd9Sstevel@tonic-gate page_t *targ; 47577c478bd9Sstevel@tonic-gate page_t *pl = NULL; 47587c478bd9Sstevel@tonic-gate uint_t ppattr; 47597c478bd9Sstevel@tonic-gate pfn_t pfn, repl_pfn; 47607c478bd9Sstevel@tonic-gate uint_t szc; 47617c478bd9Sstevel@tonic-gate spgcnt_t npgs, i; 47627c478bd9Sstevel@tonic-gate int repl_contig = 0; 47637c478bd9Sstevel@tonic-gate uint_t flags = 0; 47647c478bd9Sstevel@tonic-gate spgcnt_t dofree = 0; 47657c478bd9Sstevel@tonic-gate 47667c478bd9Sstevel@tonic-gate *nrelocp = 0; 47677c478bd9Sstevel@tonic-gate 47687c478bd9Sstevel@tonic-gate #if defined(__sparc) 47697c478bd9Sstevel@tonic-gate /* 47707c478bd9Sstevel@tonic-gate * We need to wait till OBP has completed 47717c478bd9Sstevel@tonic-gate * its boot-time handoff of its resources to the kernel 47727c478bd9Sstevel@tonic-gate * before we allow page relocation 47737c478bd9Sstevel@tonic-gate */ 47747c478bd9Sstevel@tonic-gate if (page_relocate_ready == 0) { 47757c478bd9Sstevel@tonic-gate return (EAGAIN); 47767c478bd9Sstevel@tonic-gate } 47777c478bd9Sstevel@tonic-gate #endif 47787c478bd9Sstevel@tonic-gate 47797c478bd9Sstevel@tonic-gate /* 47807c478bd9Sstevel@tonic-gate * If this is not a base page, 47817c478bd9Sstevel@tonic-gate * just return with 0x0 pages relocated. 47827c478bd9Sstevel@tonic-gate */ 47837c478bd9Sstevel@tonic-gate targ = *target; 47847c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(targ)); 47857c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(targ)); 47867c478bd9Sstevel@tonic-gate szc = targ->p_szc; 47877c478bd9Sstevel@tonic-gate ASSERT(szc < mmu_page_sizes); 47887c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_reloc[szc]); 47897c478bd9Sstevel@tonic-gate pfn = targ->p_pagenum; 47907c478bd9Sstevel@tonic-gate if (pfn != PFN_BASE(pfn, szc)) { 47917c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnoroot[szc]); 47927c478bd9Sstevel@tonic-gate return (ERANGE); 47937c478bd9Sstevel@tonic-gate } 47947c478bd9Sstevel@tonic-gate 47957c478bd9Sstevel@tonic-gate if ((repl = *replacement) != NULL && repl->p_szc >= szc) { 47967c478bd9Sstevel@tonic-gate repl_pfn = repl->p_pagenum; 47977c478bd9Sstevel@tonic-gate if (repl_pfn != PFN_BASE(repl_pfn, szc)) { 47987c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_reloc_replnoroot[szc]); 47997c478bd9Sstevel@tonic-gate return (ERANGE); 48007c478bd9Sstevel@tonic-gate } 48017c478bd9Sstevel@tonic-gate repl_contig = 1; 48027c478bd9Sstevel@tonic-gate } 48037c478bd9Sstevel@tonic-gate 48047c478bd9Sstevel@tonic-gate /* 48057c478bd9Sstevel@tonic-gate * We must lock all members of this large page or we cannot 48067c478bd9Sstevel@tonic-gate * relocate any part of it. 48077c478bd9Sstevel@tonic-gate */ 48087c478bd9Sstevel@tonic-gate if (grouplock != 0 && !group_page_trylock(targ, SE_EXCL)) { 48097c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnolock[targ->p_szc]); 48107c478bd9Sstevel@tonic-gate return (EBUSY); 48117c478bd9Sstevel@tonic-gate } 48127c478bd9Sstevel@tonic-gate 48137c478bd9Sstevel@tonic-gate /* 48147c478bd9Sstevel@tonic-gate * reread szc it could have been decreased before 48157c478bd9Sstevel@tonic-gate * group_page_trylock() was done. 48167c478bd9Sstevel@tonic-gate */ 48177c478bd9Sstevel@tonic-gate szc = targ->p_szc; 48187c478bd9Sstevel@tonic-gate ASSERT(szc < mmu_page_sizes); 48197c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_reloc[szc]); 48207c478bd9Sstevel@tonic-gate ASSERT(pfn == PFN_BASE(pfn, szc)); 48217c478bd9Sstevel@tonic-gate 48227c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(targ->p_szc); 48237c478bd9Sstevel@tonic-gate 48247c478bd9Sstevel@tonic-gate if (repl == NULL) { 48257c478bd9Sstevel@tonic-gate dofree = npgs; /* Size of target page in MMU pages */ 48267c478bd9Sstevel@tonic-gate if (!page_create_wait(dofree, 0)) { 48277c478bd9Sstevel@tonic-gate if (grouplock != 0) { 48287c478bd9Sstevel@tonic-gate group_page_unlock(targ); 48297c478bd9Sstevel@tonic-gate } 48307c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnomem[szc]); 48317c478bd9Sstevel@tonic-gate return (ENOMEM); 48327c478bd9Sstevel@tonic-gate } 48337c478bd9Sstevel@tonic-gate 48347c478bd9Sstevel@tonic-gate /* 48357c478bd9Sstevel@tonic-gate * seg kmem pages require that the target and replacement 48367c478bd9Sstevel@tonic-gate * page be the same pagesize. 48377c478bd9Sstevel@tonic-gate */ 4838ad23a2dbSjohansen flags = (VN_ISKAS(targ->p_vnode)) ? PGR_SAMESZC : 0; 48397c478bd9Sstevel@tonic-gate repl = page_get_replacement_page(targ, lgrp, flags); 48407c478bd9Sstevel@tonic-gate if (repl == NULL) { 48417c478bd9Sstevel@tonic-gate if (grouplock != 0) { 48427c478bd9Sstevel@tonic-gate group_page_unlock(targ); 48437c478bd9Sstevel@tonic-gate } 48447c478bd9Sstevel@tonic-gate page_create_putback(dofree); 48457c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnomem[szc]); 48467c478bd9Sstevel@tonic-gate return (ENOMEM); 48477c478bd9Sstevel@tonic-gate } 48487c478bd9Sstevel@tonic-gate } 48497c478bd9Sstevel@tonic-gate #ifdef DEBUG 48507c478bd9Sstevel@tonic-gate else { 48517c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(repl)); 48527c478bd9Sstevel@tonic-gate } 48537c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 48547c478bd9Sstevel@tonic-gate 48557c478bd9Sstevel@tonic-gate #if defined(__sparc) 48567c478bd9Sstevel@tonic-gate /* 48577c478bd9Sstevel@tonic-gate * Let hat_page_relocate() complete the relocation if it's kernel page 48587c478bd9Sstevel@tonic-gate */ 4859ad23a2dbSjohansen if (VN_ISKAS(targ->p_vnode)) { 48607c478bd9Sstevel@tonic-gate *replacement = repl; 48617c478bd9Sstevel@tonic-gate if (hat_page_relocate(target, replacement, nrelocp) != 0) { 48627c478bd9Sstevel@tonic-gate if (grouplock != 0) { 48637c478bd9Sstevel@tonic-gate group_page_unlock(targ); 48647c478bd9Sstevel@tonic-gate } 48657c478bd9Sstevel@tonic-gate if (dofree) { 48667c478bd9Sstevel@tonic-gate *replacement = NULL; 48677c478bd9Sstevel@tonic-gate page_free_replacement_page(repl); 48687c478bd9Sstevel@tonic-gate page_create_putback(dofree); 48697c478bd9Sstevel@tonic-gate } 48707c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_krelocfail[szc]); 48717c478bd9Sstevel@tonic-gate return (EAGAIN); 48727c478bd9Sstevel@tonic-gate } 48737c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocok[szc]); 48747c478bd9Sstevel@tonic-gate return (0); 48757c478bd9Sstevel@tonic-gate } 48767c478bd9Sstevel@tonic-gate #else 48777c478bd9Sstevel@tonic-gate #if defined(lint) 48787c478bd9Sstevel@tonic-gate dofree = dofree; 48797c478bd9Sstevel@tonic-gate #endif 48807c478bd9Sstevel@tonic-gate #endif 48817c478bd9Sstevel@tonic-gate 48827c478bd9Sstevel@tonic-gate first_repl = repl; 48837c478bd9Sstevel@tonic-gate 48847c478bd9Sstevel@tonic-gate for (i = 0; i < npgs; i++) { 48857c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(targ)); 488607b65a64Saguzovsk ASSERT(targ->p_slckcnt == 0); 488707b65a64Saguzovsk ASSERT(repl->p_slckcnt == 0); 48887c478bd9Sstevel@tonic-gate 48897c478bd9Sstevel@tonic-gate (void) hat_pageunload(targ, HAT_FORCE_PGUNLOAD); 48907c478bd9Sstevel@tonic-gate 48917c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(targ) == 0); 48927c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(targ)); 48937c478bd9Sstevel@tonic-gate ASSERT(targ->p_pagenum == (pfn + i)); 48947c478bd9Sstevel@tonic-gate ASSERT(repl_contig == 0 || 48957c478bd9Sstevel@tonic-gate repl->p_pagenum == (repl_pfn + i)); 48967c478bd9Sstevel@tonic-gate 48977c478bd9Sstevel@tonic-gate /* 48987c478bd9Sstevel@tonic-gate * Copy the page contents and attributes then 48997c478bd9Sstevel@tonic-gate * relocate the page in the page hash. 49007c478bd9Sstevel@tonic-gate */ 49018b464eb8Smec if (ppcopy(targ, repl) == 0) { 49028b464eb8Smec targ = *target; 49038b464eb8Smec repl = first_repl; 49048b464eb8Smec VM_STAT_ADD(vmm_vmstats.ppr_copyfail); 49058b464eb8Smec if (grouplock != 0) { 49068b464eb8Smec group_page_unlock(targ); 49078b464eb8Smec } 49088b464eb8Smec if (dofree) { 49098b464eb8Smec *replacement = NULL; 49108b464eb8Smec page_free_replacement_page(repl); 49118b464eb8Smec page_create_putback(dofree); 49128b464eb8Smec } 49138b464eb8Smec return (EIO); 49148b464eb8Smec } 49158b464eb8Smec 49168b464eb8Smec targ++; 49178b464eb8Smec if (repl_contig != 0) { 49188b464eb8Smec repl++; 49198b464eb8Smec } else { 49208b464eb8Smec repl = repl->p_next; 49218b464eb8Smec } 49228b464eb8Smec } 49238b464eb8Smec 49248b464eb8Smec repl = first_repl; 49258b464eb8Smec targ = *target; 49268b464eb8Smec 49278b464eb8Smec for (i = 0; i < npgs; i++) { 49287c478bd9Sstevel@tonic-gate ppattr = hat_page_getattr(targ, (P_MOD | P_REF | P_RO)); 49299d0d62adSJason Beloro page_clr_all_props(repl); 49307c478bd9Sstevel@tonic-gate page_set_props(repl, ppattr); 49317c478bd9Sstevel@tonic-gate page_relocate_hash(repl, targ); 49327c478bd9Sstevel@tonic-gate 49337c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(targ) == 0); 49347c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(repl) == 0); 49357c478bd9Sstevel@tonic-gate /* 49367c478bd9Sstevel@tonic-gate * Now clear the props on targ, after the 49377c478bd9Sstevel@tonic-gate * page_relocate_hash(), they no longer 49387c478bd9Sstevel@tonic-gate * have any meaning. 49397c478bd9Sstevel@tonic-gate */ 49409d0d62adSJason Beloro page_clr_all_props(targ); 49417c478bd9Sstevel@tonic-gate ASSERT(targ->p_next == targ); 49427c478bd9Sstevel@tonic-gate ASSERT(targ->p_prev == targ); 49437c478bd9Sstevel@tonic-gate page_list_concat(&pl, &targ); 49447c478bd9Sstevel@tonic-gate 49457c478bd9Sstevel@tonic-gate targ++; 49467c478bd9Sstevel@tonic-gate if (repl_contig != 0) { 49477c478bd9Sstevel@tonic-gate repl++; 49487c478bd9Sstevel@tonic-gate } else { 49497c478bd9Sstevel@tonic-gate repl = repl->p_next; 49507c478bd9Sstevel@tonic-gate } 49517c478bd9Sstevel@tonic-gate } 49527c478bd9Sstevel@tonic-gate /* assert that we have come full circle with repl */ 49537c478bd9Sstevel@tonic-gate ASSERT(repl_contig == 1 || first_repl == repl); 49547c478bd9Sstevel@tonic-gate 49557c478bd9Sstevel@tonic-gate *target = pl; 49567c478bd9Sstevel@tonic-gate if (*replacement == NULL) { 49577c478bd9Sstevel@tonic-gate ASSERT(first_repl == repl); 49587c478bd9Sstevel@tonic-gate *replacement = repl; 49597c478bd9Sstevel@tonic-gate } 49607c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocok[szc]); 49617c478bd9Sstevel@tonic-gate *nrelocp = npgs; 49627c478bd9Sstevel@tonic-gate return (0); 49637c478bd9Sstevel@tonic-gate } 49647c478bd9Sstevel@tonic-gate /* 49657c478bd9Sstevel@tonic-gate * On success returns 0 and *nrelocp the number of PAGESIZE pages relocated. 49667c478bd9Sstevel@tonic-gate */ 49677c478bd9Sstevel@tonic-gate int 49687c478bd9Sstevel@tonic-gate page_relocate( 49697c478bd9Sstevel@tonic-gate page_t **target, 49707c478bd9Sstevel@tonic-gate page_t **replacement, 49717c478bd9Sstevel@tonic-gate int grouplock, 49727c478bd9Sstevel@tonic-gate int freetarget, 49737c478bd9Sstevel@tonic-gate spgcnt_t *nrelocp, 49747c478bd9Sstevel@tonic-gate lgrp_t *lgrp) 49757c478bd9Sstevel@tonic-gate { 49767c478bd9Sstevel@tonic-gate spgcnt_t ret; 49777c478bd9Sstevel@tonic-gate 49787c478bd9Sstevel@tonic-gate /* do_page_relocate returns 0 on success or errno value */ 49797c478bd9Sstevel@tonic-gate ret = do_page_relocate(target, replacement, grouplock, nrelocp, lgrp); 49807c478bd9Sstevel@tonic-gate 49817c478bd9Sstevel@tonic-gate if (ret != 0 || freetarget == 0) { 49827c478bd9Sstevel@tonic-gate return (ret); 49837c478bd9Sstevel@tonic-gate } 49847c478bd9Sstevel@tonic-gate if (*nrelocp == 1) { 49857c478bd9Sstevel@tonic-gate ASSERT(*target != NULL); 49867c478bd9Sstevel@tonic-gate page_free(*target, 1); 49877c478bd9Sstevel@tonic-gate } else { 49887c478bd9Sstevel@tonic-gate page_t *tpp = *target; 49897c478bd9Sstevel@tonic-gate uint_t szc = tpp->p_szc; 49907c478bd9Sstevel@tonic-gate pgcnt_t npgs = page_get_pagecnt(szc); 49917c478bd9Sstevel@tonic-gate ASSERT(npgs > 1); 49927c478bd9Sstevel@tonic-gate ASSERT(szc != 0); 49937c478bd9Sstevel@tonic-gate do { 49947c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 49957c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(tpp)); 49967c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 49977c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 49987c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 49997c478bd9Sstevel@tonic-gate npgs--; 50007c478bd9Sstevel@tonic-gate } while ((tpp = tpp->p_next) != *target); 50017c478bd9Sstevel@tonic-gate ASSERT(npgs == 0); 50027c478bd9Sstevel@tonic-gate page_list_add_pages(*target, 0); 50037c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(szc); 50047c478bd9Sstevel@tonic-gate page_create_putback(npgs); 50057c478bd9Sstevel@tonic-gate } 50067c478bd9Sstevel@tonic-gate return (ret); 50077c478bd9Sstevel@tonic-gate } 50087c478bd9Sstevel@tonic-gate 50097c478bd9Sstevel@tonic-gate /* 50107c478bd9Sstevel@tonic-gate * it is up to the caller to deal with pcf accounting. 50117c478bd9Sstevel@tonic-gate */ 50127c478bd9Sstevel@tonic-gate void 50137c478bd9Sstevel@tonic-gate page_free_replacement_page(page_t *pplist) 50147c478bd9Sstevel@tonic-gate { 50157c478bd9Sstevel@tonic-gate page_t *pp; 50167c478bd9Sstevel@tonic-gate 50177c478bd9Sstevel@tonic-gate while (pplist != NULL) { 50187c478bd9Sstevel@tonic-gate /* 50197c478bd9Sstevel@tonic-gate * pp_targ is a linked list. 50207c478bd9Sstevel@tonic-gate */ 50217c478bd9Sstevel@tonic-gate pp = pplist; 50227c478bd9Sstevel@tonic-gate if (pp->p_szc == 0) { 50237c478bd9Sstevel@tonic-gate page_sub(&pplist, pp); 50249d0d62adSJason Beloro page_clr_all_props(pp); 50257c478bd9Sstevel@tonic-gate PP_SETFREE(pp); 50267c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 50277c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); 50287c478bd9Sstevel@tonic-gate page_unlock(pp); 50297c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_replacement_page[0]); 50307c478bd9Sstevel@tonic-gate } else { 50317c478bd9Sstevel@tonic-gate spgcnt_t curnpgs = page_get_pagecnt(pp->p_szc); 50327c478bd9Sstevel@tonic-gate page_t *tpp; 50337c478bd9Sstevel@tonic-gate page_list_break(&pp, &pplist, curnpgs); 50347c478bd9Sstevel@tonic-gate tpp = pp; 50357c478bd9Sstevel@tonic-gate do { 50367c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 50377c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(tpp)); 50389d0d62adSJason Beloro page_clr_all_props(tpp); 50397c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 50407c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 50417c478bd9Sstevel@tonic-gate } while ((tpp = tpp->p_next) != pp); 50427c478bd9Sstevel@tonic-gate page_list_add_pages(pp, 0); 50437c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_replacement_page[1]); 50447c478bd9Sstevel@tonic-gate } 50457c478bd9Sstevel@tonic-gate } 50467c478bd9Sstevel@tonic-gate } 50477c478bd9Sstevel@tonic-gate 50487c478bd9Sstevel@tonic-gate /* 50497c478bd9Sstevel@tonic-gate * Relocate target to non-relocatable replacement page. 50507c478bd9Sstevel@tonic-gate */ 50517c478bd9Sstevel@tonic-gate int 50527c478bd9Sstevel@tonic-gate page_relocate_cage(page_t **target, page_t **replacement) 50537c478bd9Sstevel@tonic-gate { 50547c478bd9Sstevel@tonic-gate page_t *tpp, *rpp; 50557c478bd9Sstevel@tonic-gate spgcnt_t pgcnt, npgs; 50567c478bd9Sstevel@tonic-gate int result; 50577c478bd9Sstevel@tonic-gate 50587c478bd9Sstevel@tonic-gate tpp = *target; 50597c478bd9Sstevel@tonic-gate 50607c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 50617c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == 0); 50627c478bd9Sstevel@tonic-gate 50637c478bd9Sstevel@tonic-gate pgcnt = btop(page_get_pagesize(tpp->p_szc)); 50647c478bd9Sstevel@tonic-gate 50657c478bd9Sstevel@tonic-gate do { 50667c478bd9Sstevel@tonic-gate (void) page_create_wait(pgcnt, PG_WAIT | PG_NORELOC); 50677c478bd9Sstevel@tonic-gate rpp = page_get_replacement_page(tpp, NULL, PGR_NORELOC); 50687c478bd9Sstevel@tonic-gate if (rpp == NULL) { 50697c478bd9Sstevel@tonic-gate page_create_putback(pgcnt); 50707c478bd9Sstevel@tonic-gate kcage_cageout_wakeup(); 50717c478bd9Sstevel@tonic-gate } 50727c478bd9Sstevel@tonic-gate } while (rpp == NULL); 50737c478bd9Sstevel@tonic-gate 50747c478bd9Sstevel@tonic-gate ASSERT(PP_ISNORELOC(rpp)); 50757c478bd9Sstevel@tonic-gate 50767c478bd9Sstevel@tonic-gate result = page_relocate(&tpp, &rpp, 0, 1, &npgs, NULL); 50777c478bd9Sstevel@tonic-gate 50787c478bd9Sstevel@tonic-gate if (result == 0) { 50797c478bd9Sstevel@tonic-gate *replacement = rpp; 50807c478bd9Sstevel@tonic-gate if (pgcnt != npgs) 50817c478bd9Sstevel@tonic-gate panic("page_relocate_cage: partial relocation"); 50827c478bd9Sstevel@tonic-gate } 50837c478bd9Sstevel@tonic-gate 50847c478bd9Sstevel@tonic-gate return (result); 50857c478bd9Sstevel@tonic-gate } 50867c478bd9Sstevel@tonic-gate 50877c478bd9Sstevel@tonic-gate /* 50887c478bd9Sstevel@tonic-gate * Release the page lock on a page, place on cachelist 50897c478bd9Sstevel@tonic-gate * tail if no longer mapped. Caller can let us know if 50907c478bd9Sstevel@tonic-gate * the page is known to be clean. 50917c478bd9Sstevel@tonic-gate */ 50927c478bd9Sstevel@tonic-gate int 50937c478bd9Sstevel@tonic-gate page_release(page_t *pp, int checkmod) 50947c478bd9Sstevel@tonic-gate { 50957c478bd9Sstevel@tonic-gate int status; 50967c478bd9Sstevel@tonic-gate 50977c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp) && !PP_ISFREE(pp) && 50986e4dd838Smec (pp->p_vnode != NULL)); 50997c478bd9Sstevel@tonic-gate 51007c478bd9Sstevel@tonic-gate if (!hat_page_is_mapped(pp) && !IS_SWAPVP(pp->p_vnode) && 51017c478bd9Sstevel@tonic-gate ((PAGE_SHARED(pp) && page_tryupgrade(pp)) || PAGE_EXCL(pp)) && 51027c478bd9Sstevel@tonic-gate pp->p_lckcnt == 0 && pp->p_cowcnt == 0 && 51037c478bd9Sstevel@tonic-gate !hat_page_is_mapped(pp)) { 51047c478bd9Sstevel@tonic-gate 51057c478bd9Sstevel@tonic-gate /* 51067c478bd9Sstevel@tonic-gate * If page is modified, unlock it 51077c478bd9Sstevel@tonic-gate * 51087c478bd9Sstevel@tonic-gate * (p_nrm & P_MOD) bit has the latest stuff because: 51097c478bd9Sstevel@tonic-gate * (1) We found that this page doesn't have any mappings 51107c478bd9Sstevel@tonic-gate * _after_ holding SE_EXCL and 51117c478bd9Sstevel@tonic-gate * (2) We didn't drop SE_EXCL lock after the check in (1) 51127c478bd9Sstevel@tonic-gate */ 51137c478bd9Sstevel@tonic-gate if (checkmod && hat_ismod(pp)) { 51147c478bd9Sstevel@tonic-gate page_unlock(pp); 51157c478bd9Sstevel@tonic-gate status = PGREL_MOD; 51167c478bd9Sstevel@tonic-gate } else { 51177c478bd9Sstevel@tonic-gate /*LINTED: constant in conditional context*/ 51187c478bd9Sstevel@tonic-gate VN_DISPOSE(pp, B_FREE, 0, kcred); 51197c478bd9Sstevel@tonic-gate status = PGREL_CLEAN; 51207c478bd9Sstevel@tonic-gate } 51217c478bd9Sstevel@tonic-gate } else { 51227c478bd9Sstevel@tonic-gate page_unlock(pp); 51237c478bd9Sstevel@tonic-gate status = PGREL_NOTREL; 51247c478bd9Sstevel@tonic-gate } 51257c478bd9Sstevel@tonic-gate return (status); 51267c478bd9Sstevel@tonic-gate } 51277c478bd9Sstevel@tonic-gate 5128db874c57Selowe /* 5129db874c57Selowe * Given a constituent page, try to demote the large page on the freelist. 5130db874c57Selowe * 5131db874c57Selowe * Returns nonzero if the page could be demoted successfully. Returns with 5132db874c57Selowe * the constituent page still locked. 5133db874c57Selowe */ 5134db874c57Selowe int 5135db874c57Selowe page_try_demote_free_pages(page_t *pp) 5136db874c57Selowe { 5137db874c57Selowe page_t *rootpp = pp; 5138db874c57Selowe pfn_t pfn = page_pptonum(pp); 5139db874c57Selowe spgcnt_t npgs; 5140db874c57Selowe uint_t szc = pp->p_szc; 5141db874c57Selowe 5142db874c57Selowe ASSERT(PP_ISFREE(pp)); 5143db874c57Selowe ASSERT(PAGE_EXCL(pp)); 5144db874c57Selowe 5145db874c57Selowe /* 5146db874c57Selowe * Adjust rootpp and lock it, if `pp' is not the base 5147db874c57Selowe * constituent page. 5148db874c57Selowe */ 5149db874c57Selowe npgs = page_get_pagecnt(pp->p_szc); 5150db874c57Selowe if (npgs == 1) { 5151db874c57Selowe return (0); 5152db874c57Selowe } 5153db874c57Selowe 5154db874c57Selowe if (!IS_P2ALIGNED(pfn, npgs)) { 5155db874c57Selowe pfn = P2ALIGN(pfn, npgs); 5156db874c57Selowe rootpp = page_numtopp_nolock(pfn); 5157db874c57Selowe } 5158db874c57Selowe 5159db874c57Selowe if (pp != rootpp && !page_trylock(rootpp, SE_EXCL)) { 5160db874c57Selowe return (0); 5161db874c57Selowe } 5162db874c57Selowe 5163db874c57Selowe if (rootpp->p_szc != szc) { 5164db874c57Selowe if (pp != rootpp) 5165db874c57Selowe page_unlock(rootpp); 5166db874c57Selowe return (0); 5167db874c57Selowe } 5168db874c57Selowe 5169db874c57Selowe page_demote_free_pages(rootpp); 5170db874c57Selowe 5171db874c57Selowe if (pp != rootpp) 5172db874c57Selowe page_unlock(rootpp); 5173db874c57Selowe 5174db874c57Selowe ASSERT(PP_ISFREE(pp)); 5175db874c57Selowe ASSERT(PAGE_EXCL(pp)); 5176db874c57Selowe return (1); 5177db874c57Selowe } 5178db874c57Selowe 5179db874c57Selowe /* 5180db874c57Selowe * Given a constituent page, try to demote the large page. 5181db874c57Selowe * 5182db874c57Selowe * Returns nonzero if the page could be demoted successfully. Returns with 5183db874c57Selowe * the constituent page still locked. 5184db874c57Selowe */ 51857c478bd9Sstevel@tonic-gate int 51867c478bd9Sstevel@tonic-gate page_try_demote_pages(page_t *pp) 51877c478bd9Sstevel@tonic-gate { 51887c478bd9Sstevel@tonic-gate page_t *tpp, *rootpp = pp; 51897c478bd9Sstevel@tonic-gate pfn_t pfn = page_pptonum(pp); 51907c478bd9Sstevel@tonic-gate spgcnt_t i, npgs; 5191f045d8d6SAmritpal Sandhu uint_t szc = pp->p_szc; 5192d94ffb28Sjmcp vnode_t *vp = pp->p_vnode; 51937c478bd9Sstevel@tonic-gate 5194db874c57Selowe ASSERT(PAGE_EXCL(pp)); 51957c478bd9Sstevel@tonic-gate 51967c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[0]); 51977c478bd9Sstevel@tonic-gate 5198db874c57Selowe if (pp->p_szc == 0) { 51997c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[1]); 52007c478bd9Sstevel@tonic-gate return (1); 52017c478bd9Sstevel@tonic-gate } 52027c478bd9Sstevel@tonic-gate 5203ad23a2dbSjohansen if (vp != NULL && !IS_SWAPFSVP(vp) && !VN_ISKAS(vp)) { 52047c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[2]); 5205db874c57Selowe page_demote_vp_pages(pp); 52067c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 52077c478bd9Sstevel@tonic-gate return (1); 52087c478bd9Sstevel@tonic-gate } 52097c478bd9Sstevel@tonic-gate 52107c478bd9Sstevel@tonic-gate /* 5211db874c57Selowe * Adjust rootpp if passed in is not the base 52127c478bd9Sstevel@tonic-gate * constituent page. 52137c478bd9Sstevel@tonic-gate */ 5214db874c57Selowe npgs = page_get_pagecnt(pp->p_szc); 52157c478bd9Sstevel@tonic-gate ASSERT(npgs > 1); 52167c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, npgs)) { 52177c478bd9Sstevel@tonic-gate pfn = P2ALIGN(pfn, npgs); 52187c478bd9Sstevel@tonic-gate rootpp = page_numtopp_nolock(pfn); 52197c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[3]); 52207c478bd9Sstevel@tonic-gate ASSERT(rootpp->p_vnode != NULL); 52217c478bd9Sstevel@tonic-gate ASSERT(rootpp->p_szc == szc); 52227c478bd9Sstevel@tonic-gate } 52237c478bd9Sstevel@tonic-gate 52247c478bd9Sstevel@tonic-gate /* 52257c478bd9Sstevel@tonic-gate * We can't demote kernel pages since we can't hat_unload() 52267c478bd9Sstevel@tonic-gate * the mappings. 52277c478bd9Sstevel@tonic-gate */ 5228ad23a2dbSjohansen if (VN_ISKAS(rootpp->p_vnode)) 52297c478bd9Sstevel@tonic-gate return (0); 52307c478bd9Sstevel@tonic-gate 52317c478bd9Sstevel@tonic-gate /* 52327c478bd9Sstevel@tonic-gate * Attempt to lock all constituent pages except the page passed 52337c478bd9Sstevel@tonic-gate * in since it's already locked. 52347c478bd9Sstevel@tonic-gate */ 5235affbd3ccSkchow for (tpp = rootpp, i = 0; i < npgs; i++, tpp++) { 52367c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(tpp)); 52377c478bd9Sstevel@tonic-gate ASSERT(tpp->p_vnode != NULL); 52387c478bd9Sstevel@tonic-gate 52397c478bd9Sstevel@tonic-gate if (tpp != pp && !page_trylock(tpp, SE_EXCL)) 52407c478bd9Sstevel@tonic-gate break; 52417c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == rootpp->p_szc); 52427c478bd9Sstevel@tonic-gate ASSERT(page_pptonum(tpp) == page_pptonum(rootpp) + i); 52437c478bd9Sstevel@tonic-gate } 52447c478bd9Sstevel@tonic-gate 52457c478bd9Sstevel@tonic-gate /* 5246db874c57Selowe * If we failed to lock them all then unlock what we have 5247db874c57Selowe * locked so far and bail. 52487c478bd9Sstevel@tonic-gate */ 52497c478bd9Sstevel@tonic-gate if (i < npgs) { 52507c478bd9Sstevel@tonic-gate tpp = rootpp; 52517c478bd9Sstevel@tonic-gate while (i-- > 0) { 52527c478bd9Sstevel@tonic-gate if (tpp != pp) 52537c478bd9Sstevel@tonic-gate page_unlock(tpp); 5254affbd3ccSkchow tpp++; 52557c478bd9Sstevel@tonic-gate } 52567c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[4]); 52577c478bd9Sstevel@tonic-gate return (0); 52587c478bd9Sstevel@tonic-gate } 52597c478bd9Sstevel@tonic-gate 5260affbd3ccSkchow for (tpp = rootpp, i = 0; i < npgs; i++, tpp++) { 52617c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 526207b65a64Saguzovsk ASSERT(tpp->p_slckcnt == 0); 5263db874c57Selowe (void) hat_pageunload(tpp, HAT_FORCE_PGUNLOAD); 52647c478bd9Sstevel@tonic-gate tpp->p_szc = 0; 52657c478bd9Sstevel@tonic-gate } 52667c478bd9Sstevel@tonic-gate 52677c478bd9Sstevel@tonic-gate /* 52687c478bd9Sstevel@tonic-gate * Unlock all pages except the page passed in. 52697c478bd9Sstevel@tonic-gate */ 5270affbd3ccSkchow for (tpp = rootpp, i = 0; i < npgs; i++, tpp++) { 52717c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(tpp)); 52727c478bd9Sstevel@tonic-gate if (tpp != pp) 52737c478bd9Sstevel@tonic-gate page_unlock(tpp); 52747c478bd9Sstevel@tonic-gate } 5275db874c57Selowe 52767c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[5]); 52777c478bd9Sstevel@tonic-gate return (1); 52787c478bd9Sstevel@tonic-gate } 52797c478bd9Sstevel@tonic-gate 52807c478bd9Sstevel@tonic-gate /* 52817c478bd9Sstevel@tonic-gate * Called by page_free() and page_destroy() to demote the page size code 52827c478bd9Sstevel@tonic-gate * (p_szc) to 0 (since we can't just put a single PAGESIZE page with non zero 52837c478bd9Sstevel@tonic-gate * p_szc on free list, neither can we just clear p_szc of a single page_t 52847c478bd9Sstevel@tonic-gate * within a large page since it will break other code that relies on p_szc 52857c478bd9Sstevel@tonic-gate * being the same for all page_t's of a large page). Anonymous pages should 52867c478bd9Sstevel@tonic-gate * never end up here because anon_map_getpages() cannot deal with p_szc 52877c478bd9Sstevel@tonic-gate * changes after a single constituent page is locked. While anonymous or 52887c478bd9Sstevel@tonic-gate * kernel large pages are demoted or freed the entire large page at a time 52897c478bd9Sstevel@tonic-gate * with all constituent pages locked EXCL for the file system pages we 52907c478bd9Sstevel@tonic-gate * have to be able to demote a large page (i.e. decrease all constituent pages 52917c478bd9Sstevel@tonic-gate * p_szc) with only just an EXCL lock on one of constituent pages. The reason 52927c478bd9Sstevel@tonic-gate * we can easily deal with anonymous page demotion the entire large page at a 52937c478bd9Sstevel@tonic-gate * time is that those operation originate at address space level and concern 52947c478bd9Sstevel@tonic-gate * the entire large page region with actual demotion only done when pages are 52957c478bd9Sstevel@tonic-gate * not shared with any other processes (therefore we can always get EXCL lock 52967c478bd9Sstevel@tonic-gate * on all anonymous constituent pages after clearing segment page 52977c478bd9Sstevel@tonic-gate * cache). However file system pages can be truncated or invalidated at a 52987c478bd9Sstevel@tonic-gate * PAGESIZE level from the file system side and end up in page_free() or 52997c478bd9Sstevel@tonic-gate * page_destroy() (we also allow only part of the large page to be SOFTLOCKed 5300da6c28aaSamw * and therefore pageout should be able to demote a large page by EXCL locking 53017c478bd9Sstevel@tonic-gate * any constituent page that is not under SOFTLOCK). In those cases we cannot 53027c478bd9Sstevel@tonic-gate * rely on being able to lock EXCL all constituent pages. 53037c478bd9Sstevel@tonic-gate * 53047c478bd9Sstevel@tonic-gate * To prevent szc changes on file system pages one has to lock all constituent 53057c478bd9Sstevel@tonic-gate * pages at least SHARED (or call page_szc_lock()). The only subsystem that 53067c478bd9Sstevel@tonic-gate * doesn't rely on locking all constituent pages (or using page_szc_lock()) to 53077c478bd9Sstevel@tonic-gate * prevent szc changes is hat layer that uses its own page level mlist 53087c478bd9Sstevel@tonic-gate * locks. hat assumes that szc doesn't change after mlist lock for a page is 53097c478bd9Sstevel@tonic-gate * taken. Therefore we need to change szc under hat level locks if we only 53107c478bd9Sstevel@tonic-gate * have an EXCL lock on a single constituent page and hat still references any 53117c478bd9Sstevel@tonic-gate * of constituent pages. (Note we can't "ignore" hat layer by simply 53127c478bd9Sstevel@tonic-gate * hat_pageunload() all constituent pages without having EXCL locks on all of 53137c478bd9Sstevel@tonic-gate * constituent pages). We use hat_page_demote() call to safely demote szc of 53147c478bd9Sstevel@tonic-gate * all constituent pages under hat locks when we only have an EXCL lock on one 53157c478bd9Sstevel@tonic-gate * of constituent pages. 53167c478bd9Sstevel@tonic-gate * 53177c478bd9Sstevel@tonic-gate * This routine calls page_szc_lock() before calling hat_page_demote() to 53187c478bd9Sstevel@tonic-gate * allow segvn in one special case not to lock all constituent pages SHARED 5319da6c28aaSamw * before calling hat_memload_array() that relies on p_szc not changing even 53207c478bd9Sstevel@tonic-gate * before hat level mlist lock is taken. In that case segvn uses 5321da6c28aaSamw * page_szc_lock() to prevent hat_page_demote() changing p_szc values. 53227c478bd9Sstevel@tonic-gate * 53237c478bd9Sstevel@tonic-gate * Anonymous or kernel page demotion still has to lock all pages exclusively 53247c478bd9Sstevel@tonic-gate * and do hat_pageunload() on all constituent pages before demoting the page 53257c478bd9Sstevel@tonic-gate * therefore there's no need for anonymous or kernel page demotion to use 53267c478bd9Sstevel@tonic-gate * hat_page_demote() mechanism. 53277c478bd9Sstevel@tonic-gate * 53287c478bd9Sstevel@tonic-gate * hat_page_demote() removes all large mappings that map pp and then decreases 53297c478bd9Sstevel@tonic-gate * p_szc starting from the last constituent page of the large page. By working 53307c478bd9Sstevel@tonic-gate * from the tail of a large page in pfn decreasing order allows one looking at 53317c478bd9Sstevel@tonic-gate * the root page to know that hat_page_demote() is done for root's szc area. 53327c478bd9Sstevel@tonic-gate * e.g. if a root page has szc 1 one knows it only has to lock all constituent 53337c478bd9Sstevel@tonic-gate * pages within szc 1 area to prevent szc changes because hat_page_demote() 53347c478bd9Sstevel@tonic-gate * that started on this page when it had szc > 1 is done for this szc 1 area. 53357c478bd9Sstevel@tonic-gate * 5336da6c28aaSamw * We are guaranteed that all constituent pages of pp's large page belong to 53377c478bd9Sstevel@tonic-gate * the same vnode with the consecutive offsets increasing in the direction of 53387c478bd9Sstevel@tonic-gate * the pfn i.e. the identity of constituent pages can't change until their 53397c478bd9Sstevel@tonic-gate * p_szc is decreased. Therefore it's safe for hat_page_demote() to remove 53407c478bd9Sstevel@tonic-gate * large mappings to pp even though we don't lock any constituent page except 53417c478bd9Sstevel@tonic-gate * pp (i.e. we won't unload e.g. kernel locked page). 53427c478bd9Sstevel@tonic-gate */ 53437c478bd9Sstevel@tonic-gate static void 53447c478bd9Sstevel@tonic-gate page_demote_vp_pages(page_t *pp) 53457c478bd9Sstevel@tonic-gate { 53467c478bd9Sstevel@tonic-gate kmutex_t *mtx; 53477c478bd9Sstevel@tonic-gate 53487c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 53497c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 53507c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode != NULL); 53517c478bd9Sstevel@tonic-gate ASSERT(!IS_SWAPFSVP(pp->p_vnode)); 5352ad23a2dbSjohansen ASSERT(!PP_ISKAS(pp)); 53537c478bd9Sstevel@tonic-gate 53547c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_demote_pages[0]); 53557c478bd9Sstevel@tonic-gate 53567c478bd9Sstevel@tonic-gate mtx = page_szc_lock(pp); 53577c478bd9Sstevel@tonic-gate if (mtx != NULL) { 53587c478bd9Sstevel@tonic-gate hat_page_demote(pp); 53597c478bd9Sstevel@tonic-gate mutex_exit(mtx); 53607c478bd9Sstevel@tonic-gate } 53617c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 53627c478bd9Sstevel@tonic-gate } 53637c478bd9Sstevel@tonic-gate 53647c478bd9Sstevel@tonic-gate /* 53657c478bd9Sstevel@tonic-gate * Mark any existing pages for migration in the given range 53667c478bd9Sstevel@tonic-gate */ 53677c478bd9Sstevel@tonic-gate void 53687c478bd9Sstevel@tonic-gate page_mark_migrate(struct seg *seg, caddr_t addr, size_t len, 53697c478bd9Sstevel@tonic-gate struct anon_map *amp, ulong_t anon_index, vnode_t *vp, 53707c478bd9Sstevel@tonic-gate u_offset_t vnoff, int rflag) 53717c478bd9Sstevel@tonic-gate { 53727c478bd9Sstevel@tonic-gate struct anon *ap; 53737c478bd9Sstevel@tonic-gate vnode_t *curvp; 53747c478bd9Sstevel@tonic-gate lgrp_t *from; 53757c478bd9Sstevel@tonic-gate pgcnt_t nlocked; 53767c478bd9Sstevel@tonic-gate u_offset_t off; 53777c478bd9Sstevel@tonic-gate pfn_t pfn; 53787c478bd9Sstevel@tonic-gate size_t pgsz; 53797c478bd9Sstevel@tonic-gate size_t segpgsz; 53807c478bd9Sstevel@tonic-gate pgcnt_t pages; 53817c478bd9Sstevel@tonic-gate uint_t pszc; 53825c16be9bSDonghai Qiao page_t *pp0, *pp; 53837c478bd9Sstevel@tonic-gate caddr_t va; 53847c478bd9Sstevel@tonic-gate ulong_t an_idx; 53857c478bd9Sstevel@tonic-gate anon_sync_obj_t cookie; 53867c478bd9Sstevel@tonic-gate 5387dc32d872SJosef 'Jeff' Sipek ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as)); 53887c478bd9Sstevel@tonic-gate 53897c478bd9Sstevel@tonic-gate /* 53907c478bd9Sstevel@tonic-gate * Don't do anything if don't need to do lgroup optimizations 53917c478bd9Sstevel@tonic-gate * on this system 53927c478bd9Sstevel@tonic-gate */ 53937c478bd9Sstevel@tonic-gate if (!lgrp_optimizations()) 53947c478bd9Sstevel@tonic-gate return; 53957c478bd9Sstevel@tonic-gate 53967c478bd9Sstevel@tonic-gate /* 53977c478bd9Sstevel@tonic-gate * Align address and length to (potentially large) page boundary 53987c478bd9Sstevel@tonic-gate */ 53997c478bd9Sstevel@tonic-gate segpgsz = page_get_pagesize(seg->s_szc); 54007c478bd9Sstevel@tonic-gate addr = (caddr_t)P2ALIGN((uintptr_t)addr, segpgsz); 54017c478bd9Sstevel@tonic-gate if (rflag) 54027c478bd9Sstevel@tonic-gate len = P2ROUNDUP(len, segpgsz); 54037c478bd9Sstevel@tonic-gate 54047c478bd9Sstevel@tonic-gate /* 54057c478bd9Sstevel@tonic-gate * Do one (large) page at a time 54067c478bd9Sstevel@tonic-gate */ 54077c478bd9Sstevel@tonic-gate va = addr; 54087c478bd9Sstevel@tonic-gate while (va < addr + len) { 54097c478bd9Sstevel@tonic-gate /* 54107c478bd9Sstevel@tonic-gate * Lookup (root) page for vnode and offset corresponding to 54117c478bd9Sstevel@tonic-gate * this virtual address 54127c478bd9Sstevel@tonic-gate * Try anonmap first since there may be copy-on-write 54137c478bd9Sstevel@tonic-gate * pages, but initialize vnode pointer and offset using 54147c478bd9Sstevel@tonic-gate * vnode arguments just in case there isn't an amp. 54157c478bd9Sstevel@tonic-gate */ 54167c478bd9Sstevel@tonic-gate curvp = vp; 54177c478bd9Sstevel@tonic-gate off = vnoff + va - seg->s_base; 54187c478bd9Sstevel@tonic-gate if (amp) { 54197c478bd9Sstevel@tonic-gate ANON_LOCK_ENTER(&->a_rwlock, RW_READER); 54207c478bd9Sstevel@tonic-gate an_idx = anon_index + seg_page(seg, va); 54217c478bd9Sstevel@tonic-gate anon_array_enter(amp, an_idx, &cookie); 54227c478bd9Sstevel@tonic-gate ap = anon_get_ptr(amp->ahp, an_idx); 54237c478bd9Sstevel@tonic-gate if (ap) 54247c478bd9Sstevel@tonic-gate swap_xlate(ap, &curvp, &off); 54257c478bd9Sstevel@tonic-gate anon_array_exit(&cookie); 54267c478bd9Sstevel@tonic-gate ANON_LOCK_EXIT(&->a_rwlock); 54277c478bd9Sstevel@tonic-gate } 54287c478bd9Sstevel@tonic-gate 54297c478bd9Sstevel@tonic-gate pp = NULL; 54307c478bd9Sstevel@tonic-gate if (curvp) 54317c478bd9Sstevel@tonic-gate pp = page_lookup(curvp, off, SE_SHARED); 54327c478bd9Sstevel@tonic-gate 54337c478bd9Sstevel@tonic-gate /* 54347c478bd9Sstevel@tonic-gate * If there isn't a page at this virtual address, 54357c478bd9Sstevel@tonic-gate * skip to next page 54367c478bd9Sstevel@tonic-gate */ 54377c478bd9Sstevel@tonic-gate if (pp == NULL) { 54387c478bd9Sstevel@tonic-gate va += PAGESIZE; 54397c478bd9Sstevel@tonic-gate continue; 54407c478bd9Sstevel@tonic-gate } 54417c478bd9Sstevel@tonic-gate 54427c478bd9Sstevel@tonic-gate /* 54437c478bd9Sstevel@tonic-gate * Figure out which lgroup this page is in for kstats 54447c478bd9Sstevel@tonic-gate */ 54457c478bd9Sstevel@tonic-gate pfn = page_pptonum(pp); 54467c478bd9Sstevel@tonic-gate from = lgrp_pfn_to_lgrp(pfn); 54477c478bd9Sstevel@tonic-gate 54487c478bd9Sstevel@tonic-gate /* 54497c478bd9Sstevel@tonic-gate * Get page size, and round up and skip to next page boundary 54507c478bd9Sstevel@tonic-gate * if unaligned address 54517c478bd9Sstevel@tonic-gate */ 54527c478bd9Sstevel@tonic-gate pszc = pp->p_szc; 54537c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(pszc); 54547c478bd9Sstevel@tonic-gate pages = btop(pgsz); 54557c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(va, pgsz) || 54567c478bd9Sstevel@tonic-gate !IS_P2ALIGNED(pfn, pages) || 54577c478bd9Sstevel@tonic-gate pgsz > segpgsz) { 54587c478bd9Sstevel@tonic-gate pgsz = MIN(pgsz, segpgsz); 54597c478bd9Sstevel@tonic-gate page_unlock(pp); 54605c16be9bSDonghai Qiao pages = btop(P2END((uintptr_t)va, pgsz) - 54617c478bd9Sstevel@tonic-gate (uintptr_t)va); 54627c478bd9Sstevel@tonic-gate va = (caddr_t)P2END((uintptr_t)va, pgsz); 54635c16be9bSDonghai Qiao lgrp_stat_add(from->lgrp_id, LGRP_PMM_FAIL_PGS, pages); 54647c478bd9Sstevel@tonic-gate continue; 54657c478bd9Sstevel@tonic-gate } 54667c478bd9Sstevel@tonic-gate 54677c478bd9Sstevel@tonic-gate /* 54687c478bd9Sstevel@tonic-gate * Upgrade to exclusive lock on page 54697c478bd9Sstevel@tonic-gate */ 54707c478bd9Sstevel@tonic-gate if (!page_tryupgrade(pp)) { 54717c478bd9Sstevel@tonic-gate page_unlock(pp); 54727c478bd9Sstevel@tonic-gate va += pgsz; 54737c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_FAIL_PGS, 54747c478bd9Sstevel@tonic-gate btop(pgsz)); 54757c478bd9Sstevel@tonic-gate continue; 54767c478bd9Sstevel@tonic-gate } 54777c478bd9Sstevel@tonic-gate 54785c16be9bSDonghai Qiao pp0 = pp++; 54797c478bd9Sstevel@tonic-gate nlocked = 1; 54807c478bd9Sstevel@tonic-gate 54817c478bd9Sstevel@tonic-gate /* 54827c478bd9Sstevel@tonic-gate * Lock constituent pages if this is large page 54837c478bd9Sstevel@tonic-gate */ 54847c478bd9Sstevel@tonic-gate if (pages > 1) { 54857c478bd9Sstevel@tonic-gate /* 54867c478bd9Sstevel@tonic-gate * Lock all constituents except root page, since it 54877c478bd9Sstevel@tonic-gate * should be locked already. 54887c478bd9Sstevel@tonic-gate */ 54895c16be9bSDonghai Qiao for (; nlocked < pages; nlocked++) { 54907c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) { 54917c478bd9Sstevel@tonic-gate break; 54927c478bd9Sstevel@tonic-gate } 54937c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp) || 54947c478bd9Sstevel@tonic-gate pp->p_szc != pszc) { 54957c478bd9Sstevel@tonic-gate /* 54967c478bd9Sstevel@tonic-gate * hat_page_demote() raced in with us. 54977c478bd9Sstevel@tonic-gate */ 54987c478bd9Sstevel@tonic-gate ASSERT(!IS_SWAPFSVP(curvp)); 54997c478bd9Sstevel@tonic-gate page_unlock(pp); 55007c478bd9Sstevel@tonic-gate break; 55017c478bd9Sstevel@tonic-gate } 55025c16be9bSDonghai Qiao pp++; 55037c478bd9Sstevel@tonic-gate } 55047c478bd9Sstevel@tonic-gate } 55057c478bd9Sstevel@tonic-gate 55067c478bd9Sstevel@tonic-gate /* 55077c478bd9Sstevel@tonic-gate * If all constituent pages couldn't be locked, 55087c478bd9Sstevel@tonic-gate * unlock pages locked so far and skip to next page. 55097c478bd9Sstevel@tonic-gate */ 55105c16be9bSDonghai Qiao if (nlocked < pages) { 55115c16be9bSDonghai Qiao while (pp0 < pp) { 55125c16be9bSDonghai Qiao page_unlock(pp0++); 55135c16be9bSDonghai Qiao } 55147c478bd9Sstevel@tonic-gate va += pgsz; 55157c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_FAIL_PGS, 55167c478bd9Sstevel@tonic-gate btop(pgsz)); 55177c478bd9Sstevel@tonic-gate continue; 55187c478bd9Sstevel@tonic-gate } 55197c478bd9Sstevel@tonic-gate 55207c478bd9Sstevel@tonic-gate /* 55217c478bd9Sstevel@tonic-gate * hat_page_demote() can no longer happen 55227c478bd9Sstevel@tonic-gate * since last cons page had the right p_szc after 55237c478bd9Sstevel@tonic-gate * all cons pages were locked. all cons pages 55247c478bd9Sstevel@tonic-gate * should now have the same p_szc. 55257c478bd9Sstevel@tonic-gate */ 55267c478bd9Sstevel@tonic-gate 55277c478bd9Sstevel@tonic-gate /* 55287c478bd9Sstevel@tonic-gate * All constituent pages locked successfully, so mark 55297c478bd9Sstevel@tonic-gate * large page for migration and unload the mappings of 55307c478bd9Sstevel@tonic-gate * constituent pages, so a fault will occur on any part of the 55317c478bd9Sstevel@tonic-gate * large page 55327c478bd9Sstevel@tonic-gate */ 55335c16be9bSDonghai Qiao PP_SETMIGRATE(pp0); 55345c16be9bSDonghai Qiao while (pp0 < pp) { 55355c16be9bSDonghai Qiao (void) hat_pageunload(pp0, HAT_FORCE_PGUNLOAD); 55365c16be9bSDonghai Qiao ASSERT(hat_page_getshare(pp0) == 0); 55375c16be9bSDonghai Qiao page_unlock(pp0++); 55387c478bd9Sstevel@tonic-gate } 55397c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_PGS, nlocked); 55407c478bd9Sstevel@tonic-gate 55417c478bd9Sstevel@tonic-gate va += pgsz; 55427c478bd9Sstevel@tonic-gate } 55437c478bd9Sstevel@tonic-gate } 55447c478bd9Sstevel@tonic-gate 55457c478bd9Sstevel@tonic-gate /* 55467c478bd9Sstevel@tonic-gate * Migrate any pages that have been marked for migration in the given range 55477c478bd9Sstevel@tonic-gate */ 55487c478bd9Sstevel@tonic-gate void 55497c478bd9Sstevel@tonic-gate page_migrate( 55507c478bd9Sstevel@tonic-gate struct seg *seg, 55517c478bd9Sstevel@tonic-gate caddr_t addr, 55527c478bd9Sstevel@tonic-gate page_t **ppa, 55537c478bd9Sstevel@tonic-gate pgcnt_t npages) 55547c478bd9Sstevel@tonic-gate { 55557c478bd9Sstevel@tonic-gate lgrp_t *from; 55567c478bd9Sstevel@tonic-gate lgrp_t *to; 55577c478bd9Sstevel@tonic-gate page_t *newpp; 55587c478bd9Sstevel@tonic-gate page_t *pp; 55597c478bd9Sstevel@tonic-gate pfn_t pfn; 55607c478bd9Sstevel@tonic-gate size_t pgsz; 55617c478bd9Sstevel@tonic-gate spgcnt_t page_cnt; 55627c478bd9Sstevel@tonic-gate spgcnt_t i; 55637c478bd9Sstevel@tonic-gate uint_t pszc; 55647c478bd9Sstevel@tonic-gate 5565dc32d872SJosef 'Jeff' Sipek ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as)); 55667c478bd9Sstevel@tonic-gate 55677c478bd9Sstevel@tonic-gate while (npages > 0) { 55687c478bd9Sstevel@tonic-gate pp = *ppa; 55697c478bd9Sstevel@tonic-gate pszc = pp->p_szc; 55707c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(pszc); 55717c478bd9Sstevel@tonic-gate page_cnt = btop(pgsz); 55727c478bd9Sstevel@tonic-gate 55737c478bd9Sstevel@tonic-gate /* 55747c478bd9Sstevel@tonic-gate * Check to see whether this page is marked for migration 55757c478bd9Sstevel@tonic-gate * 55767c478bd9Sstevel@tonic-gate * Assume that root page of large page is marked for 55777c478bd9Sstevel@tonic-gate * migration and none of the other constituent pages 55787c478bd9Sstevel@tonic-gate * are marked. This really simplifies clearing the 55797c478bd9Sstevel@tonic-gate * migrate bit by not having to clear it from each 55807c478bd9Sstevel@tonic-gate * constituent page. 55817c478bd9Sstevel@tonic-gate * 55827c478bd9Sstevel@tonic-gate * note we don't want to relocate an entire large page if 55837c478bd9Sstevel@tonic-gate * someone is only using one subpage. 55847c478bd9Sstevel@tonic-gate */ 55857c478bd9Sstevel@tonic-gate if (npages < page_cnt) 55867c478bd9Sstevel@tonic-gate break; 55877c478bd9Sstevel@tonic-gate 55887c478bd9Sstevel@tonic-gate /* 55897c478bd9Sstevel@tonic-gate * Is it marked for migration? 55907c478bd9Sstevel@tonic-gate */ 55917c478bd9Sstevel@tonic-gate if (!PP_ISMIGRATE(pp)) 55927c478bd9Sstevel@tonic-gate goto next; 55937c478bd9Sstevel@tonic-gate 55947c478bd9Sstevel@tonic-gate /* 55957c478bd9Sstevel@tonic-gate * Determine lgroups that page is being migrated between 55967c478bd9Sstevel@tonic-gate */ 55977c478bd9Sstevel@tonic-gate pfn = page_pptonum(pp); 55987c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, page_cnt)) { 55997c478bd9Sstevel@tonic-gate break; 56007c478bd9Sstevel@tonic-gate } 56017c478bd9Sstevel@tonic-gate from = lgrp_pfn_to_lgrp(pfn); 56027c478bd9Sstevel@tonic-gate to = lgrp_mem_choose(seg, addr, pgsz); 56037c478bd9Sstevel@tonic-gate 56047c478bd9Sstevel@tonic-gate /* 56057c478bd9Sstevel@tonic-gate * Need to get exclusive lock's to migrate 56067c478bd9Sstevel@tonic-gate */ 56077c478bd9Sstevel@tonic-gate for (i = 0; i < page_cnt; i++) { 56087c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(ppa[i])); 56097c478bd9Sstevel@tonic-gate if (page_pptonum(ppa[i]) != pfn + i || 56107c478bd9Sstevel@tonic-gate ppa[i]->p_szc != pszc) { 56117c478bd9Sstevel@tonic-gate break; 56127c478bd9Sstevel@tonic-gate } 56137c478bd9Sstevel@tonic-gate if (!page_tryupgrade(ppa[i])) { 56147c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, 56157c478bd9Sstevel@tonic-gate LGRP_PM_FAIL_LOCK_PGS, 56167c478bd9Sstevel@tonic-gate page_cnt); 56177c478bd9Sstevel@tonic-gate break; 56187c478bd9Sstevel@tonic-gate } 56196bc16138Sjj 56206bc16138Sjj /* 56216bc16138Sjj * Check to see whether we are trying to migrate 56226bc16138Sjj * page to lgroup where it is allocated already. 56236bc16138Sjj * If so, clear the migrate bit and skip to next 56246bc16138Sjj * page. 56256bc16138Sjj */ 56266bc16138Sjj if (i == 0 && to == from) { 56276bc16138Sjj PP_CLRMIGRATE(ppa[0]); 56286bc16138Sjj page_downgrade(ppa[0]); 56296bc16138Sjj goto next; 56306bc16138Sjj } 56317c478bd9Sstevel@tonic-gate } 56326bc16138Sjj 56336bc16138Sjj /* 56346bc16138Sjj * If all constituent pages couldn't be locked, 56356bc16138Sjj * unlock pages locked so far and skip to next page. 56366bc16138Sjj */ 56377c478bd9Sstevel@tonic-gate if (i != page_cnt) { 56387c478bd9Sstevel@tonic-gate while (--i != -1) { 56397c478bd9Sstevel@tonic-gate page_downgrade(ppa[i]); 56407c478bd9Sstevel@tonic-gate } 56417c478bd9Sstevel@tonic-gate goto next; 56427c478bd9Sstevel@tonic-gate } 56437c478bd9Sstevel@tonic-gate 56447c478bd9Sstevel@tonic-gate (void) page_create_wait(page_cnt, PG_WAIT); 56457c478bd9Sstevel@tonic-gate newpp = page_get_replacement_page(pp, to, PGR_SAMESZC); 56467c478bd9Sstevel@tonic-gate if (newpp == NULL) { 56477c478bd9Sstevel@tonic-gate page_create_putback(page_cnt); 56487c478bd9Sstevel@tonic-gate for (i = 0; i < page_cnt; i++) { 56497c478bd9Sstevel@tonic-gate page_downgrade(ppa[i]); 56507c478bd9Sstevel@tonic-gate } 56517c478bd9Sstevel@tonic-gate lgrp_stat_add(to->lgrp_id, LGRP_PM_FAIL_ALLOC_PGS, 56527c478bd9Sstevel@tonic-gate page_cnt); 56537c478bd9Sstevel@tonic-gate goto next; 56547c478bd9Sstevel@tonic-gate } 56557c478bd9Sstevel@tonic-gate ASSERT(newpp->p_szc == pszc); 56567c478bd9Sstevel@tonic-gate /* 56577c478bd9Sstevel@tonic-gate * Clear migrate bit and relocate page 56587c478bd9Sstevel@tonic-gate */ 56597c478bd9Sstevel@tonic-gate PP_CLRMIGRATE(pp); 56607c478bd9Sstevel@tonic-gate if (page_relocate(&pp, &newpp, 0, 1, &page_cnt, to)) { 56617c478bd9Sstevel@tonic-gate panic("page_migrate: page_relocate failed"); 56627c478bd9Sstevel@tonic-gate } 56637c478bd9Sstevel@tonic-gate ASSERT(page_cnt * PAGESIZE == pgsz); 56647c478bd9Sstevel@tonic-gate 56657c478bd9Sstevel@tonic-gate /* 56667c478bd9Sstevel@tonic-gate * Keep stats for number of pages migrated from and to 56677c478bd9Sstevel@tonic-gate * each lgroup 56687c478bd9Sstevel@tonic-gate */ 56697c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PM_SRC_PGS, page_cnt); 56707c478bd9Sstevel@tonic-gate lgrp_stat_add(to->lgrp_id, LGRP_PM_DEST_PGS, page_cnt); 56717c478bd9Sstevel@tonic-gate /* 56727c478bd9Sstevel@tonic-gate * update the page_t array we were passed in and 56737c478bd9Sstevel@tonic-gate * unlink constituent pages of a large page. 56747c478bd9Sstevel@tonic-gate */ 56757c478bd9Sstevel@tonic-gate for (i = 0; i < page_cnt; ++i, ++pp) { 56767c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(newpp)); 56777c478bd9Sstevel@tonic-gate ASSERT(newpp->p_szc == pszc); 56787c478bd9Sstevel@tonic-gate ppa[i] = newpp; 56797c478bd9Sstevel@tonic-gate pp = newpp; 56807c478bd9Sstevel@tonic-gate page_sub(&newpp, pp); 56817c478bd9Sstevel@tonic-gate page_downgrade(pp); 56827c478bd9Sstevel@tonic-gate } 56837c478bd9Sstevel@tonic-gate ASSERT(newpp == NULL); 56847c478bd9Sstevel@tonic-gate next: 56857c478bd9Sstevel@tonic-gate addr += pgsz; 56867c478bd9Sstevel@tonic-gate ppa += page_cnt; 56877c478bd9Sstevel@tonic-gate npages -= page_cnt; 56887c478bd9Sstevel@tonic-gate } 56897c478bd9Sstevel@tonic-gate } 56907c478bd9Sstevel@tonic-gate 56919424a8dfSDan Kimmel uint_t page_reclaim_maxcnt = 60; /* max total iterations */ 56929424a8dfSDan Kimmel uint_t page_reclaim_nofree_maxcnt = 3; /* max iterations without progress */ 56933cff2f43Sstans /* 56943cff2f43Sstans * Reclaim/reserve availrmem for npages. 56953cff2f43Sstans * If there is not enough memory start reaping seg, kmem caches. 56963cff2f43Sstans * Start pageout scanner (via page_needfree()). 56973cff2f43Sstans * Exit after ~ MAX_CNT s regardless of how much memory has been released. 56983cff2f43Sstans * Note: There is no guarantee that any availrmem will be freed as 56993cff2f43Sstans * this memory typically is locked (kernel heap) or reserved for swap. 57003cff2f43Sstans * Also due to memory fragmentation kmem allocator may not be able 57013cff2f43Sstans * to free any memory (single user allocated buffer will prevent 57023cff2f43Sstans * freeing slab or a page). 57033cff2f43Sstans */ 57043cff2f43Sstans int 57053cff2f43Sstans page_reclaim_mem(pgcnt_t npages, pgcnt_t epages, int adjust) 57063cff2f43Sstans { 57073cff2f43Sstans int i = 0; 57089424a8dfSDan Kimmel int i_nofree = 0; 57093cff2f43Sstans int ret = 0; 57103cff2f43Sstans pgcnt_t deficit; 57119424a8dfSDan Kimmel pgcnt_t old_availrmem = 0; 57123cff2f43Sstans 57133cff2f43Sstans mutex_enter(&freemem_lock); 57149424a8dfSDan Kimmel while (availrmem < tune.t_minarmem + npages + epages && 57159424a8dfSDan Kimmel i++ < page_reclaim_maxcnt) { 57169424a8dfSDan Kimmel /* ensure we made some progress in the last few iterations */ 57179424a8dfSDan Kimmel if (old_availrmem < availrmem) { 57189424a8dfSDan Kimmel old_availrmem = availrmem; 57199424a8dfSDan Kimmel i_nofree = 0; 57209424a8dfSDan Kimmel } else if (i_nofree++ >= page_reclaim_nofree_maxcnt) { 57219424a8dfSDan Kimmel break; 57229424a8dfSDan Kimmel } 57239424a8dfSDan Kimmel 57243cff2f43Sstans deficit = tune.t_minarmem + npages + epages - availrmem; 57253cff2f43Sstans mutex_exit(&freemem_lock); 57263cff2f43Sstans page_needfree(deficit); 57273cff2f43Sstans kmem_reap(); 57283cff2f43Sstans delay(hz); 57293cff2f43Sstans page_needfree(-(spgcnt_t)deficit); 57303cff2f43Sstans mutex_enter(&freemem_lock); 57313cff2f43Sstans } 57323cff2f43Sstans 57333cff2f43Sstans if (adjust && (availrmem >= tune.t_minarmem + npages + epages)) { 57343cff2f43Sstans availrmem -= npages; 57353cff2f43Sstans ret = 1; 57363cff2f43Sstans } 57373cff2f43Sstans 57383cff2f43Sstans mutex_exit(&freemem_lock); 57393cff2f43Sstans 57403cff2f43Sstans return (ret); 57413cff2f43Sstans } 57427c478bd9Sstevel@tonic-gate 57437c478bd9Sstevel@tonic-gate /* 57447c478bd9Sstevel@tonic-gate * Search the memory segments to locate the desired page. Within a 57457c478bd9Sstevel@tonic-gate * segment, pages increase linearly with one page structure per 57467c478bd9Sstevel@tonic-gate * physical page frame (size PAGESIZE). The search begins 57477c478bd9Sstevel@tonic-gate * with the segment that was accessed last, to take advantage of locality. 57487c478bd9Sstevel@tonic-gate * If the hint misses, we start from the beginning of the sorted memseg list 57497c478bd9Sstevel@tonic-gate */ 57507c478bd9Sstevel@tonic-gate 57517c478bd9Sstevel@tonic-gate 57527c478bd9Sstevel@tonic-gate /* 57537c478bd9Sstevel@tonic-gate * Some data structures for pfn to pp lookup. 57547c478bd9Sstevel@tonic-gate */ 57557c478bd9Sstevel@tonic-gate ulong_t mhash_per_slot; 57567c478bd9Sstevel@tonic-gate struct memseg *memseg_hash[N_MEM_SLOTS]; 57577c478bd9Sstevel@tonic-gate 57587c478bd9Sstevel@tonic-gate page_t * 57597c478bd9Sstevel@tonic-gate page_numtopp_nolock(pfn_t pfnum) 57607c478bd9Sstevel@tonic-gate { 57617c478bd9Sstevel@tonic-gate struct memseg *seg; 57627c478bd9Sstevel@tonic-gate page_t *pp; 57632af6eb52SMichael Corcoran vm_cpu_data_t *vc; 57647c478bd9Sstevel@tonic-gate 57652af6eb52SMichael Corcoran /* 57662af6eb52SMichael Corcoran * We need to disable kernel preemption while referencing the 57672af6eb52SMichael Corcoran * cpu_vm_data field in order to prevent us from being switched to 57682af6eb52SMichael Corcoran * another cpu and trying to reference it after it has been freed. 57692af6eb52SMichael Corcoran * This will keep us on cpu and prevent it from being removed while 57702af6eb52SMichael Corcoran * we are still on it. 57719853d9e8SJason Beloro * 57729853d9e8SJason Beloro * We may be caching a memseg in vc_pnum_memseg/vc_pnext_memseg 57739853d9e8SJason Beloro * which is being resued by DR who will flush those references 57749853d9e8SJason Beloro * before modifying the reused memseg. See memseg_cpu_vm_flush(). 57752af6eb52SMichael Corcoran */ 57762af6eb52SMichael Corcoran kpreempt_disable(); 57772af6eb52SMichael Corcoran vc = CPU->cpu_vm_data; 5778affbd3ccSkchow ASSERT(vc != NULL); 57797c478bd9Sstevel@tonic-gate 57807c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nsearch); 57817c478bd9Sstevel@tonic-gate 57827c478bd9Sstevel@tonic-gate /* Try last winner first */ 5783affbd3ccSkchow if (((seg = vc->vc_pnum_memseg) != NULL) && 57846e4dd838Smec (pfnum >= seg->pages_base) && (pfnum < seg->pages_end)) { 57857c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nlastwon); 57867c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 57872af6eb52SMichael Corcoran if (pp->p_pagenum == pfnum) { 57882af6eb52SMichael Corcoran kpreempt_enable(); 57897c478bd9Sstevel@tonic-gate return ((page_t *)pp); 57902af6eb52SMichael Corcoran } 57917c478bd9Sstevel@tonic-gate } 57927c478bd9Sstevel@tonic-gate 57937c478bd9Sstevel@tonic-gate /* Else Try hash */ 57947c478bd9Sstevel@tonic-gate if (((seg = memseg_hash[MEMSEG_PFN_HASH(pfnum)]) != NULL) && 57956e4dd838Smec (pfnum >= seg->pages_base) && (pfnum < seg->pages_end)) { 57967c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nhashwon); 5797affbd3ccSkchow vc->vc_pnum_memseg = seg; 57987c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 57992af6eb52SMichael Corcoran if (pp->p_pagenum == pfnum) { 58002af6eb52SMichael Corcoran kpreempt_enable(); 58017c478bd9Sstevel@tonic-gate return ((page_t *)pp); 58022af6eb52SMichael Corcoran } 58037c478bd9Sstevel@tonic-gate } 58047c478bd9Sstevel@tonic-gate 58057c478bd9Sstevel@tonic-gate /* Else Brute force */ 58067c478bd9Sstevel@tonic-gate for (seg = memsegs; seg != NULL; seg = seg->next) { 58077c478bd9Sstevel@tonic-gate if (pfnum >= seg->pages_base && pfnum < seg->pages_end) { 5808affbd3ccSkchow vc->vc_pnum_memseg = seg; 58097c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 58109853d9e8SJason Beloro if (pp->p_pagenum == pfnum) { 58119853d9e8SJason Beloro kpreempt_enable(); 58129853d9e8SJason Beloro return ((page_t *)pp); 58139853d9e8SJason Beloro } 58147c478bd9Sstevel@tonic-gate } 58157c478bd9Sstevel@tonic-gate } 5816affbd3ccSkchow vc->vc_pnum_memseg = NULL; 58172af6eb52SMichael Corcoran kpreempt_enable(); 58187c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nnotfound); 58197c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 58207c478bd9Sstevel@tonic-gate 58217c478bd9Sstevel@tonic-gate } 58227c478bd9Sstevel@tonic-gate 58237c478bd9Sstevel@tonic-gate struct memseg * 58247c478bd9Sstevel@tonic-gate page_numtomemseg_nolock(pfn_t pfnum) 58257c478bd9Sstevel@tonic-gate { 58267c478bd9Sstevel@tonic-gate struct memseg *seg; 58277c478bd9Sstevel@tonic-gate page_t *pp; 58287c478bd9Sstevel@tonic-gate 58299853d9e8SJason Beloro /* 58309853d9e8SJason Beloro * We may be caching a memseg in vc_pnum_memseg/vc_pnext_memseg 58319853d9e8SJason Beloro * which is being resued by DR who will flush those references 58329853d9e8SJason Beloro * before modifying the reused memseg. See memseg_cpu_vm_flush(). 58339853d9e8SJason Beloro */ 58349853d9e8SJason Beloro kpreempt_disable(); 58357c478bd9Sstevel@tonic-gate /* Try hash */ 58367c478bd9Sstevel@tonic-gate if (((seg = memseg_hash[MEMSEG_PFN_HASH(pfnum)]) != NULL) && 58376e4dd838Smec (pfnum >= seg->pages_base) && (pfnum < seg->pages_end)) { 58387c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 58399853d9e8SJason Beloro if (pp->p_pagenum == pfnum) { 58409853d9e8SJason Beloro kpreempt_enable(); 58417c478bd9Sstevel@tonic-gate return (seg); 58429853d9e8SJason Beloro } 58437c478bd9Sstevel@tonic-gate } 58447c478bd9Sstevel@tonic-gate 58457c478bd9Sstevel@tonic-gate /* Else Brute force */ 58467c478bd9Sstevel@tonic-gate for (seg = memsegs; seg != NULL; seg = seg->next) { 58477c478bd9Sstevel@tonic-gate if (pfnum >= seg->pages_base && pfnum < seg->pages_end) { 58489853d9e8SJason Beloro pp = seg->pages + (pfnum - seg->pages_base); 58499853d9e8SJason Beloro if (pp->p_pagenum == pfnum) { 58509853d9e8SJason Beloro kpreempt_enable(); 58519853d9e8SJason Beloro return (seg); 58529853d9e8SJason Beloro } 58537c478bd9Sstevel@tonic-gate } 58547c478bd9Sstevel@tonic-gate } 58559853d9e8SJason Beloro kpreempt_enable(); 58567c478bd9Sstevel@tonic-gate return ((struct memseg *)NULL); 58577c478bd9Sstevel@tonic-gate } 58587c478bd9Sstevel@tonic-gate 58597c478bd9Sstevel@tonic-gate /* 58607c478bd9Sstevel@tonic-gate * Given a page and a count return the page struct that is 58617c478bd9Sstevel@tonic-gate * n structs away from the current one in the global page 58627c478bd9Sstevel@tonic-gate * list. 58637c478bd9Sstevel@tonic-gate * 58647c478bd9Sstevel@tonic-gate * This function wraps to the first page upon 58657c478bd9Sstevel@tonic-gate * reaching the end of the memseg list. 58667c478bd9Sstevel@tonic-gate */ 58677c478bd9Sstevel@tonic-gate page_t * 58687c478bd9Sstevel@tonic-gate page_nextn(page_t *pp, ulong_t n) 58697c478bd9Sstevel@tonic-gate { 58707c478bd9Sstevel@tonic-gate struct memseg *seg; 58717c478bd9Sstevel@tonic-gate page_t *ppn; 58722af6eb52SMichael Corcoran vm_cpu_data_t *vc; 58732af6eb52SMichael Corcoran 58742af6eb52SMichael Corcoran /* 58752af6eb52SMichael Corcoran * We need to disable kernel preemption while referencing the 58762af6eb52SMichael Corcoran * cpu_vm_data field in order to prevent us from being switched to 58772af6eb52SMichael Corcoran * another cpu and trying to reference it after it has been freed. 58782af6eb52SMichael Corcoran * This will keep us on cpu and prevent it from being removed while 58792af6eb52SMichael Corcoran * we are still on it. 58809853d9e8SJason Beloro * 58819853d9e8SJason Beloro * We may be caching a memseg in vc_pnum_memseg/vc_pnext_memseg 58829853d9e8SJason Beloro * which is being resued by DR who will flush those references 58839853d9e8SJason Beloro * before modifying the reused memseg. See memseg_cpu_vm_flush(). 58842af6eb52SMichael Corcoran */ 58852af6eb52SMichael Corcoran kpreempt_disable(); 58862af6eb52SMichael Corcoran vc = (vm_cpu_data_t *)CPU->cpu_vm_data; 58877c478bd9Sstevel@tonic-gate 5888affbd3ccSkchow ASSERT(vc != NULL); 5889affbd3ccSkchow 5890affbd3ccSkchow if (((seg = vc->vc_pnext_memseg) == NULL) || 58917c478bd9Sstevel@tonic-gate (seg->pages_base == seg->pages_end) || 58927c478bd9Sstevel@tonic-gate !(pp >= seg->pages && pp < seg->epages)) { 58937c478bd9Sstevel@tonic-gate 58947c478bd9Sstevel@tonic-gate for (seg = memsegs; seg; seg = seg->next) { 58957c478bd9Sstevel@tonic-gate if (pp >= seg->pages && pp < seg->epages) 58967c478bd9Sstevel@tonic-gate break; 58977c478bd9Sstevel@tonic-gate } 58987c478bd9Sstevel@tonic-gate 58997c478bd9Sstevel@tonic-gate if (seg == NULL) { 59007c478bd9Sstevel@tonic-gate /* Memory delete got in, return something valid. */ 59017c478bd9Sstevel@tonic-gate /* TODO: fix me. */ 59027c478bd9Sstevel@tonic-gate seg = memsegs; 59037c478bd9Sstevel@tonic-gate pp = seg->pages; 59047c478bd9Sstevel@tonic-gate } 59057c478bd9Sstevel@tonic-gate } 59067c478bd9Sstevel@tonic-gate 59077c478bd9Sstevel@tonic-gate /* check for wraparound - possible if n is large */ 59087c478bd9Sstevel@tonic-gate while ((ppn = (pp + n)) >= seg->epages || ppn < pp) { 59097c478bd9Sstevel@tonic-gate n -= seg->epages - pp; 59107c478bd9Sstevel@tonic-gate seg = seg->next; 59117c478bd9Sstevel@tonic-gate if (seg == NULL) 59127c478bd9Sstevel@tonic-gate seg = memsegs; 59137c478bd9Sstevel@tonic-gate pp = seg->pages; 59147c478bd9Sstevel@tonic-gate } 5915affbd3ccSkchow vc->vc_pnext_memseg = seg; 59162af6eb52SMichael Corcoran kpreempt_enable(); 59177c478bd9Sstevel@tonic-gate return (ppn); 59187c478bd9Sstevel@tonic-gate } 59197c478bd9Sstevel@tonic-gate 59207c478bd9Sstevel@tonic-gate /* 59217c478bd9Sstevel@tonic-gate * Initialize for a loop using page_next_scan_large(). 59227c478bd9Sstevel@tonic-gate */ 59237c478bd9Sstevel@tonic-gate page_t * 59247c478bd9Sstevel@tonic-gate page_next_scan_init(void **cookie) 59257c478bd9Sstevel@tonic-gate { 59267c478bd9Sstevel@tonic-gate ASSERT(cookie != NULL); 59277c478bd9Sstevel@tonic-gate *cookie = (void *)memsegs; 59287c478bd9Sstevel@tonic-gate return ((page_t *)memsegs->pages); 59297c478bd9Sstevel@tonic-gate } 59307c478bd9Sstevel@tonic-gate 59317c478bd9Sstevel@tonic-gate /* 59327c478bd9Sstevel@tonic-gate * Return the next page in a scan of page_t's, assuming we want 59337c478bd9Sstevel@tonic-gate * to skip over sub-pages within larger page sizes. 59347c478bd9Sstevel@tonic-gate * 59357c478bd9Sstevel@tonic-gate * The cookie is used to keep track of the current memseg. 59367c478bd9Sstevel@tonic-gate */ 59377c478bd9Sstevel@tonic-gate page_t * 59387c478bd9Sstevel@tonic-gate page_next_scan_large( 59397c478bd9Sstevel@tonic-gate page_t *pp, 59407c478bd9Sstevel@tonic-gate ulong_t *n, 59417c478bd9Sstevel@tonic-gate void **cookie) 59427c478bd9Sstevel@tonic-gate { 59437c478bd9Sstevel@tonic-gate struct memseg *seg = (struct memseg *)*cookie; 59447c478bd9Sstevel@tonic-gate page_t *new_pp; 59457c478bd9Sstevel@tonic-gate ulong_t cnt; 59467c478bd9Sstevel@tonic-gate pfn_t pfn; 59477c478bd9Sstevel@tonic-gate 59487c478bd9Sstevel@tonic-gate 59497c478bd9Sstevel@tonic-gate /* 59507c478bd9Sstevel@tonic-gate * get the count of page_t's to skip based on the page size 59517c478bd9Sstevel@tonic-gate */ 59527c478bd9Sstevel@tonic-gate ASSERT(pp != NULL); 59537c478bd9Sstevel@tonic-gate if (pp->p_szc == 0) { 59547c478bd9Sstevel@tonic-gate cnt = 1; 59557c478bd9Sstevel@tonic-gate } else { 59567c478bd9Sstevel@tonic-gate pfn = page_pptonum(pp); 59577c478bd9Sstevel@tonic-gate cnt = page_get_pagecnt(pp->p_szc); 59587c478bd9Sstevel@tonic-gate cnt -= pfn & (cnt - 1); 59597c478bd9Sstevel@tonic-gate } 59607c478bd9Sstevel@tonic-gate *n += cnt; 59617c478bd9Sstevel@tonic-gate new_pp = pp + cnt; 59627c478bd9Sstevel@tonic-gate 59637c478bd9Sstevel@tonic-gate /* 59647c478bd9Sstevel@tonic-gate * Catch if we went past the end of the current memory segment. If so, 59657c478bd9Sstevel@tonic-gate * just move to the next segment with pages. 59667c478bd9Sstevel@tonic-gate */ 59679853d9e8SJason Beloro if (new_pp >= seg->epages || seg->pages_base == seg->pages_end) { 59687c478bd9Sstevel@tonic-gate do { 59697c478bd9Sstevel@tonic-gate seg = seg->next; 59707c478bd9Sstevel@tonic-gate if (seg == NULL) 59717c478bd9Sstevel@tonic-gate seg = memsegs; 59729853d9e8SJason Beloro } while (seg->pages_base == seg->pages_end); 59737c478bd9Sstevel@tonic-gate new_pp = seg->pages; 59747c478bd9Sstevel@tonic-gate *cookie = (void *)seg; 59757c478bd9Sstevel@tonic-gate } 59767c478bd9Sstevel@tonic-gate 59777c478bd9Sstevel@tonic-gate return (new_pp); 59787c478bd9Sstevel@tonic-gate } 59797c478bd9Sstevel@tonic-gate 59807c478bd9Sstevel@tonic-gate 59817c478bd9Sstevel@tonic-gate /* 59827c478bd9Sstevel@tonic-gate * Returns next page in list. Note: this function wraps 59837c478bd9Sstevel@tonic-gate * to the first page in the list upon reaching the end 59847c478bd9Sstevel@tonic-gate * of the list. Callers should be aware of this fact. 59857c478bd9Sstevel@tonic-gate */ 59867c478bd9Sstevel@tonic-gate 59877c478bd9Sstevel@tonic-gate /* We should change this be a #define */ 59887c478bd9Sstevel@tonic-gate 59897c478bd9Sstevel@tonic-gate page_t * 59907c478bd9Sstevel@tonic-gate page_next(page_t *pp) 59917c478bd9Sstevel@tonic-gate { 59927c478bd9Sstevel@tonic-gate return (page_nextn(pp, 1)); 59937c478bd9Sstevel@tonic-gate } 59947c478bd9Sstevel@tonic-gate 59957c478bd9Sstevel@tonic-gate page_t * 59967c478bd9Sstevel@tonic-gate page_first() 59977c478bd9Sstevel@tonic-gate { 59987c478bd9Sstevel@tonic-gate return ((page_t *)memsegs->pages); 59997c478bd9Sstevel@tonic-gate } 60007c478bd9Sstevel@tonic-gate 60017c478bd9Sstevel@tonic-gate 60027c478bd9Sstevel@tonic-gate /* 60037c478bd9Sstevel@tonic-gate * This routine is called at boot with the initial memory configuration 60047c478bd9Sstevel@tonic-gate * and when memory is added or removed. 60057c478bd9Sstevel@tonic-gate */ 60067c478bd9Sstevel@tonic-gate void 60077c478bd9Sstevel@tonic-gate build_pfn_hash() 60087c478bd9Sstevel@tonic-gate { 60097c478bd9Sstevel@tonic-gate pfn_t cur; 60107c478bd9Sstevel@tonic-gate pgcnt_t index; 60117c478bd9Sstevel@tonic-gate struct memseg *pseg; 60127c478bd9Sstevel@tonic-gate int i; 60137c478bd9Sstevel@tonic-gate 60147c478bd9Sstevel@tonic-gate /* 60157c478bd9Sstevel@tonic-gate * Clear memseg_hash array. 60167c478bd9Sstevel@tonic-gate * Since memory add/delete is designed to operate concurrently 60177c478bd9Sstevel@tonic-gate * with normal operation, the hash rebuild must be able to run 60187c478bd9Sstevel@tonic-gate * concurrently with page_numtopp_nolock(). To support this 60197c478bd9Sstevel@tonic-gate * functionality, assignments to memseg_hash array members must 60207c478bd9Sstevel@tonic-gate * be done atomically. 60217c478bd9Sstevel@tonic-gate * 60227c478bd9Sstevel@tonic-gate * NOTE: bzero() does not currently guarantee this for kernel 60237c478bd9Sstevel@tonic-gate * threads, and cannot be used here. 60247c478bd9Sstevel@tonic-gate */ 60257c478bd9Sstevel@tonic-gate for (i = 0; i < N_MEM_SLOTS; i++) 60267c478bd9Sstevel@tonic-gate memseg_hash[i] = NULL; 60277c478bd9Sstevel@tonic-gate 60287c478bd9Sstevel@tonic-gate hat_kpm_mseghash_clear(N_MEM_SLOTS); 60297c478bd9Sstevel@tonic-gate 60307c478bd9Sstevel@tonic-gate /* 60317c478bd9Sstevel@tonic-gate * Physmax is the last valid pfn. 60327c478bd9Sstevel@tonic-gate */ 60337c478bd9Sstevel@tonic-gate mhash_per_slot = (physmax + 1) >> MEM_HASH_SHIFT; 60347c478bd9Sstevel@tonic-gate for (pseg = memsegs; pseg != NULL; pseg = pseg->next) { 60357c478bd9Sstevel@tonic-gate index = MEMSEG_PFN_HASH(pseg->pages_base); 60367c478bd9Sstevel@tonic-gate cur = pseg->pages_base; 60377c478bd9Sstevel@tonic-gate do { 60387c478bd9Sstevel@tonic-gate if (index >= N_MEM_SLOTS) 60397c478bd9Sstevel@tonic-gate index = MEMSEG_PFN_HASH(cur); 60407c478bd9Sstevel@tonic-gate 60417c478bd9Sstevel@tonic-gate if (memseg_hash[index] == NULL || 60427c478bd9Sstevel@tonic-gate memseg_hash[index]->pages_base > pseg->pages_base) { 60437c478bd9Sstevel@tonic-gate memseg_hash[index] = pseg; 60447c478bd9Sstevel@tonic-gate hat_kpm_mseghash_update(index, pseg); 60457c478bd9Sstevel@tonic-gate } 60467c478bd9Sstevel@tonic-gate cur += mhash_per_slot; 60477c478bd9Sstevel@tonic-gate index++; 60487c478bd9Sstevel@tonic-gate } while (cur < pseg->pages_end); 60497c478bd9Sstevel@tonic-gate } 60507c478bd9Sstevel@tonic-gate } 60517c478bd9Sstevel@tonic-gate 60527c478bd9Sstevel@tonic-gate /* 60537c478bd9Sstevel@tonic-gate * Return the pagenum for the pp 60547c478bd9Sstevel@tonic-gate */ 60557c478bd9Sstevel@tonic-gate pfn_t 60567c478bd9Sstevel@tonic-gate page_pptonum(page_t *pp) 60577c478bd9Sstevel@tonic-gate { 60587c478bd9Sstevel@tonic-gate return (pp->p_pagenum); 60597c478bd9Sstevel@tonic-gate } 60607c478bd9Sstevel@tonic-gate 60617c478bd9Sstevel@tonic-gate /* 60627c478bd9Sstevel@tonic-gate * interface to the referenced and modified etc bits 60637c478bd9Sstevel@tonic-gate * in the PSM part of the page struct 60647c478bd9Sstevel@tonic-gate * when no locking is desired. 60657c478bd9Sstevel@tonic-gate */ 60667c478bd9Sstevel@tonic-gate void 60677c478bd9Sstevel@tonic-gate page_set_props(page_t *pp, uint_t flags) 60687c478bd9Sstevel@tonic-gate { 60697c478bd9Sstevel@tonic-gate ASSERT((flags & ~(P_MOD | P_REF | P_RO)) == 0); 60707c478bd9Sstevel@tonic-gate pp->p_nrm |= (uchar_t)flags; 60717c478bd9Sstevel@tonic-gate } 60727c478bd9Sstevel@tonic-gate 60737c478bd9Sstevel@tonic-gate void 60749d0d62adSJason Beloro page_clr_all_props(page_t *pp) 60757c478bd9Sstevel@tonic-gate { 60767c478bd9Sstevel@tonic-gate pp->p_nrm = 0; 60777c478bd9Sstevel@tonic-gate } 60787c478bd9Sstevel@tonic-gate 60797c478bd9Sstevel@tonic-gate /* 6080db874c57Selowe * Clear p_lckcnt and p_cowcnt, adjusting freemem if required. 60817c478bd9Sstevel@tonic-gate */ 60827c478bd9Sstevel@tonic-gate int 6083db874c57Selowe page_clear_lck_cow(page_t *pp, int adjust) 60847c478bd9Sstevel@tonic-gate { 6085db874c57Selowe int f_amount; 60867c478bd9Sstevel@tonic-gate 6087db874c57Selowe ASSERT(PAGE_EXCL(pp)); 60887c478bd9Sstevel@tonic-gate 60897c478bd9Sstevel@tonic-gate /* 6090db874c57Selowe * The page_struct_lock need not be acquired here since 6091db874c57Selowe * we require the caller hold the page exclusively locked. 60927c478bd9Sstevel@tonic-gate */ 6093db874c57Selowe f_amount = 0; 6094db874c57Selowe if (pp->p_lckcnt) { 6095db874c57Selowe f_amount = 1; 6096db874c57Selowe pp->p_lckcnt = 0; 6097db874c57Selowe } 6098db874c57Selowe if (pp->p_cowcnt) { 6099db874c57Selowe f_amount += pp->p_cowcnt; 6100db874c57Selowe pp->p_cowcnt = 0; 6101db874c57Selowe } 61027c478bd9Sstevel@tonic-gate 6103db874c57Selowe if (adjust && f_amount) { 6104db874c57Selowe mutex_enter(&freemem_lock); 6105db874c57Selowe availrmem += f_amount; 6106db874c57Selowe mutex_exit(&freemem_lock); 61077c478bd9Sstevel@tonic-gate } 61087c478bd9Sstevel@tonic-gate 6109db874c57Selowe return (f_amount); 61107c478bd9Sstevel@tonic-gate } 61117c478bd9Sstevel@tonic-gate 61127c478bd9Sstevel@tonic-gate /* 6113db874c57Selowe * The following functions is called from free_vp_pages() 6114db874c57Selowe * for an inexact estimate of a newly free'd page... 61157c478bd9Sstevel@tonic-gate */ 6116db874c57Selowe ulong_t 6117db874c57Selowe page_share_cnt(page_t *pp) 6118db874c57Selowe { 6119db874c57Selowe return (hat_page_getshare(pp)); 6120db874c57Selowe } 6121db874c57Selowe 61227c478bd9Sstevel@tonic-gate int 61237c478bd9Sstevel@tonic-gate page_isshared(page_t *pp) 61247c478bd9Sstevel@tonic-gate { 612505d3dc4bSpaulsan return (hat_page_checkshare(pp, 1)); 61267c478bd9Sstevel@tonic-gate } 61277c478bd9Sstevel@tonic-gate 61287c478bd9Sstevel@tonic-gate int 61297c478bd9Sstevel@tonic-gate page_isfree(page_t *pp) 61307c478bd9Sstevel@tonic-gate { 61317c478bd9Sstevel@tonic-gate return (PP_ISFREE(pp)); 61327c478bd9Sstevel@tonic-gate } 61337c478bd9Sstevel@tonic-gate 61347c478bd9Sstevel@tonic-gate int 61357c478bd9Sstevel@tonic-gate page_isref(page_t *pp) 61367c478bd9Sstevel@tonic-gate { 61377c478bd9Sstevel@tonic-gate return (hat_page_getattr(pp, P_REF)); 61387c478bd9Sstevel@tonic-gate } 61397c478bd9Sstevel@tonic-gate 61407c478bd9Sstevel@tonic-gate int 61417c478bd9Sstevel@tonic-gate page_ismod(page_t *pp) 61427c478bd9Sstevel@tonic-gate { 61437c478bd9Sstevel@tonic-gate return (hat_page_getattr(pp, P_MOD)); 61447c478bd9Sstevel@tonic-gate } 61458b464eb8Smec 61468b464eb8Smec /* 61478b464eb8Smec * The following code all currently relates to the page capture logic: 61488b464eb8Smec * 61498b464eb8Smec * This logic is used for cases where there is a desire to claim a certain 61508b464eb8Smec * physical page in the system for the caller. As it may not be possible 61518b464eb8Smec * to capture the page immediately, the p_toxic bits are used in the page 61528b464eb8Smec * structure to indicate that someone wants to capture this page. When the 61538b464eb8Smec * page gets unlocked, the toxic flag will be noted and an attempt to capture 61548b464eb8Smec * the page will be made. If it is successful, the original callers callback 61558b464eb8Smec * will be called with the page to do with it what they please. 61568b464eb8Smec * 61578b464eb8Smec * There is also an async thread which wakes up to attempt to capture 61588b464eb8Smec * pages occasionally which have the capture bit set. All of the pages which 61598b464eb8Smec * need to be captured asynchronously have been inserted into the 61608b464eb8Smec * page_capture_hash and thus this thread walks that hash list. Items in the 61618b464eb8Smec * hash have an expiration time so this thread handles that as well by removing 61628b464eb8Smec * the item from the hash if it has expired. 61638b464eb8Smec * 61648b464eb8Smec * Some important things to note are: 61658b464eb8Smec * - if the PR_CAPTURE bit is set on a page, then the page is in the 61668b464eb8Smec * page_capture_hash. The page_capture_hash_head.pchh_mutex is needed 61678b464eb8Smec * to set and clear this bit, and while the lock is held is the only time 61688b464eb8Smec * you can add or remove an entry from the hash. 61698b464eb8Smec * - the PR_CAPTURE bit can only be set and cleared while holding the 61708b464eb8Smec * page_capture_hash_head.pchh_mutex 61718b464eb8Smec * - the t_flag field of the thread struct is used with the T_CAPTURING 61728b464eb8Smec * flag to prevent recursion while dealing with large pages. 61738b464eb8Smec * - pages which need to be retired never expire on the page_capture_hash. 61748b464eb8Smec */ 61758b464eb8Smec 61768b464eb8Smec static void page_capture_thread(void); 61778b464eb8Smec static kthread_t *pc_thread_id; 61788b464eb8Smec kcondvar_t pc_cv; 61798b464eb8Smec static kmutex_t pc_thread_mutex; 61808b464eb8Smec static clock_t pc_thread_shortwait; 61818b464eb8Smec static clock_t pc_thread_longwait; 6182a98e9dbfSaguzovsk static int pc_thread_retry; 61838b464eb8Smec 61848b464eb8Smec struct page_capture_callback pc_cb[PC_NUM_CALLBACKS]; 61858b464eb8Smec 61868b464eb8Smec /* Note that this is a circular linked list */ 61878b464eb8Smec typedef struct page_capture_hash_bucket { 61888b464eb8Smec page_t *pp; 618911494be0SStan Studzinski uchar_t szc; 619011494be0SStan Studzinski uchar_t pri; 61918b464eb8Smec uint_t flags; 61928b464eb8Smec clock_t expires; /* lbolt at which this request expires. */ 61938b464eb8Smec void *datap; /* Cached data passed in for callback */ 61948b464eb8Smec struct page_capture_hash_bucket *next; 61958b464eb8Smec struct page_capture_hash_bucket *prev; 61968b464eb8Smec } page_capture_hash_bucket_t; 61978b464eb8Smec 619811494be0SStan Studzinski #define PC_PRI_HI 0 /* capture now */ 619911494be0SStan Studzinski #define PC_PRI_LO 1 /* capture later */ 620011494be0SStan Studzinski #define PC_NUM_PRI 2 620111494be0SStan Studzinski 620211494be0SStan Studzinski #define PAGE_CAPTURE_PRIO(pp) (PP_ISRAF(pp) ? PC_PRI_LO : PC_PRI_HI) 620311494be0SStan Studzinski 620411494be0SStan Studzinski 62058b464eb8Smec /* 62068b464eb8Smec * Each hash bucket will have it's own mutex and two lists which are: 62078b464eb8Smec * active (0): represents requests which have not been processed by 62088b464eb8Smec * the page_capture async thread yet. 62098b464eb8Smec * walked (1): represents requests which have been processed by the 62108b464eb8Smec * page_capture async thread within it's given walk of this bucket. 62118b464eb8Smec * 62128b464eb8Smec * These are all needed so that we can synchronize all async page_capture 62138b464eb8Smec * events. When the async thread moves to a new bucket, it will append the 62148b464eb8Smec * walked list to the active list and walk each item one at a time, moving it 62158b464eb8Smec * from the active list to the walked list. Thus if there is an async request 62168b464eb8Smec * outstanding for a given page, it will always be in one of the two lists. 62178b464eb8Smec * New requests will always be added to the active list. 62188b464eb8Smec * If we were not able to capture a page before the request expired, we'd free 62198b464eb8Smec * up the request structure which would indicate to page_capture that there is 62208b464eb8Smec * no longer a need for the given page, and clear the PR_CAPTURE flag if 62218b464eb8Smec * possible. 62228b464eb8Smec */ 62238b464eb8Smec typedef struct page_capture_hash_head { 62248b464eb8Smec kmutex_t pchh_mutex; 622511494be0SStan Studzinski uint_t num_pages[PC_NUM_PRI]; 62268b464eb8Smec page_capture_hash_bucket_t lists[2]; /* sentinel nodes */ 62278b464eb8Smec } page_capture_hash_head_t; 62288b464eb8Smec 62298b464eb8Smec #ifdef DEBUG 62308b464eb8Smec #define NUM_PAGE_CAPTURE_BUCKETS 4 62318b464eb8Smec #else 62328b464eb8Smec #define NUM_PAGE_CAPTURE_BUCKETS 64 62338b464eb8Smec #endif 62348b464eb8Smec 62358b464eb8Smec page_capture_hash_head_t page_capture_hash[NUM_PAGE_CAPTURE_BUCKETS]; 62368b464eb8Smec 62378b464eb8Smec /* for now use a very simple hash based upon the size of a page struct */ 62388b464eb8Smec #define PAGE_CAPTURE_HASH(pp) \ 62398b464eb8Smec ((int)(((uintptr_t)pp >> 7) & (NUM_PAGE_CAPTURE_BUCKETS - 1))) 62408b464eb8Smec 62418b464eb8Smec extern pgcnt_t swapfs_minfree; 62428b464eb8Smec 62438b464eb8Smec int page_trycapture(page_t *pp, uint_t szc, uint_t flags, void *datap); 62448b464eb8Smec 62458b464eb8Smec /* 62468b464eb8Smec * a callback function is required for page capture requests. 62478b464eb8Smec */ 62488b464eb8Smec void 62498b464eb8Smec page_capture_register_callback(uint_t index, clock_t duration, 62508b464eb8Smec int (*cb_func)(page_t *, void *, uint_t)) 62518b464eb8Smec { 62528b464eb8Smec ASSERT(pc_cb[index].cb_active == 0); 62538b464eb8Smec ASSERT(cb_func != NULL); 62548b464eb8Smec rw_enter(&pc_cb[index].cb_rwlock, RW_WRITER); 62558b464eb8Smec pc_cb[index].duration = duration; 62568b464eb8Smec pc_cb[index].cb_func = cb_func; 62578b464eb8Smec pc_cb[index].cb_active = 1; 62588b464eb8Smec rw_exit(&pc_cb[index].cb_rwlock); 62598b464eb8Smec } 62608b464eb8Smec 62618b464eb8Smec void 62628b464eb8Smec page_capture_unregister_callback(uint_t index) 62638b464eb8Smec { 62648b464eb8Smec int i, j; 62658b464eb8Smec struct page_capture_hash_bucket *bp1; 62668b464eb8Smec struct page_capture_hash_bucket *bp2; 62678b464eb8Smec struct page_capture_hash_bucket *head = NULL; 62688b464eb8Smec uint_t flags = (1 << index); 62698b464eb8Smec 62708b464eb8Smec rw_enter(&pc_cb[index].cb_rwlock, RW_WRITER); 62718b464eb8Smec ASSERT(pc_cb[index].cb_active == 1); 62728b464eb8Smec pc_cb[index].duration = 0; /* Paranoia */ 62738b464eb8Smec pc_cb[index].cb_func = NULL; /* Paranoia */ 62748b464eb8Smec pc_cb[index].cb_active = 0; 62758b464eb8Smec rw_exit(&pc_cb[index].cb_rwlock); 62768b464eb8Smec 62778b464eb8Smec /* 62788b464eb8Smec * Just move all the entries to a private list which we can walk 62798b464eb8Smec * through without the need to hold any locks. 62808b464eb8Smec * No more requests can get added to the hash lists for this consumer 62818b464eb8Smec * as the cb_active field for the callback has been cleared. 62828b464eb8Smec */ 62838b464eb8Smec for (i = 0; i < NUM_PAGE_CAPTURE_BUCKETS; i++) { 62848b464eb8Smec mutex_enter(&page_capture_hash[i].pchh_mutex); 62858b464eb8Smec for (j = 0; j < 2; j++) { 62868b464eb8Smec bp1 = page_capture_hash[i].lists[j].next; 62878b464eb8Smec /* walk through all but first (sentinel) element */ 62888b464eb8Smec while (bp1 != &page_capture_hash[i].lists[j]) { 62898b464eb8Smec bp2 = bp1; 62908b464eb8Smec if (bp2->flags & flags) { 62918b464eb8Smec bp1 = bp2->next; 62928b464eb8Smec bp1->prev = bp2->prev; 62938b464eb8Smec bp2->prev->next = bp1; 62948b464eb8Smec bp2->next = head; 62958b464eb8Smec head = bp2; 62968b464eb8Smec /* 62978b464eb8Smec * Clear the PR_CAPTURE bit as we 62988b464eb8Smec * hold appropriate locks here. 62998b464eb8Smec */ 63008b464eb8Smec page_clrtoxic(head->pp, PR_CAPTURE); 630111494be0SStan Studzinski page_capture_hash[i]. 630211494be0SStan Studzinski num_pages[bp2->pri]--; 63038b464eb8Smec continue; 63048b464eb8Smec } 63058b464eb8Smec bp1 = bp1->next; 63068b464eb8Smec } 63078b464eb8Smec } 63088b464eb8Smec mutex_exit(&page_capture_hash[i].pchh_mutex); 63098b464eb8Smec } 63108b464eb8Smec 63118b464eb8Smec while (head != NULL) { 63128b464eb8Smec bp1 = head; 63138b464eb8Smec head = head->next; 63148b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 63158b464eb8Smec } 63168b464eb8Smec } 63178b464eb8Smec 63188b464eb8Smec 63198b464eb8Smec /* 63208b464eb8Smec * Find pp in the active list and move it to the walked list if it 63218b464eb8Smec * exists. 63228b464eb8Smec * Note that most often pp should be at the front of the active list 63238b464eb8Smec * as it is currently used and thus there is no other sort of optimization 63248b464eb8Smec * being done here as this is a linked list data structure. 63258b464eb8Smec * Returns 1 on successful move or 0 if page could not be found. 63268b464eb8Smec */ 63278b464eb8Smec static int 63288b464eb8Smec page_capture_move_to_walked(page_t *pp) 63298b464eb8Smec { 63308b464eb8Smec page_capture_hash_bucket_t *bp; 63318b464eb8Smec int index; 63328b464eb8Smec 63338b464eb8Smec index = PAGE_CAPTURE_HASH(pp); 63348b464eb8Smec 63358b464eb8Smec mutex_enter(&page_capture_hash[index].pchh_mutex); 63368b464eb8Smec bp = page_capture_hash[index].lists[0].next; 63378b464eb8Smec while (bp != &page_capture_hash[index].lists[0]) { 63388b464eb8Smec if (bp->pp == pp) { 63398b464eb8Smec /* Remove from old list */ 63408b464eb8Smec bp->next->prev = bp->prev; 63418b464eb8Smec bp->prev->next = bp->next; 63428b464eb8Smec 63438b464eb8Smec /* Add to new list */ 63448b464eb8Smec bp->next = page_capture_hash[index].lists[1].next; 63458b464eb8Smec bp->prev = &page_capture_hash[index].lists[1]; 63468b464eb8Smec page_capture_hash[index].lists[1].next = bp; 63478b464eb8Smec bp->next->prev = bp; 63488b464eb8Smec 634911494be0SStan Studzinski /* 635011494be0SStan Studzinski * There is a small probability of page on a free 635111494be0SStan Studzinski * list being retired while being allocated 635211494be0SStan Studzinski * and before P_RAF is set on it. The page may 635311494be0SStan Studzinski * end up marked as high priority request instead 635411494be0SStan Studzinski * of low priority request. 635511494be0SStan Studzinski * If P_RAF page is not marked as low priority request 635611494be0SStan Studzinski * change it to low priority request. 635711494be0SStan Studzinski */ 635811494be0SStan Studzinski page_capture_hash[index].num_pages[bp->pri]--; 635911494be0SStan Studzinski bp->pri = PAGE_CAPTURE_PRIO(pp); 636011494be0SStan Studzinski page_capture_hash[index].num_pages[bp->pri]++; 636111494be0SStan Studzinski mutex_exit(&page_capture_hash[index].pchh_mutex); 63628b464eb8Smec return (1); 63638b464eb8Smec } 63648b464eb8Smec bp = bp->next; 63658b464eb8Smec } 63668b464eb8Smec mutex_exit(&page_capture_hash[index].pchh_mutex); 63678b464eb8Smec return (0); 63688b464eb8Smec } 63698b464eb8Smec 63708b464eb8Smec /* 63718b464eb8Smec * Add a new entry to the page capture hash. The only case where a new 63728b464eb8Smec * entry is not added is when the page capture consumer is no longer registered. 63738b464eb8Smec * In this case, we'll silently not add the page to the hash. We know that 63748b464eb8Smec * page retire will always be registered for the case where we are currently 63758b464eb8Smec * unretiring a page and thus there are no conflicts. 63768b464eb8Smec */ 63778b464eb8Smec static void 63788b464eb8Smec page_capture_add_hash(page_t *pp, uint_t szc, uint_t flags, void *datap) 63798b464eb8Smec { 63808b464eb8Smec page_capture_hash_bucket_t *bp1; 63818b464eb8Smec page_capture_hash_bucket_t *bp2; 63828b464eb8Smec int index; 63838b464eb8Smec int cb_index; 63848b464eb8Smec int i; 638511494be0SStan Studzinski uchar_t pri; 63868b464eb8Smec #ifdef DEBUG 63878b464eb8Smec page_capture_hash_bucket_t *tp1; 63888b464eb8Smec int l; 63898b464eb8Smec #endif 63908b464eb8Smec 63918b464eb8Smec ASSERT(!(flags & CAPTURE_ASYNC)); 63928b464eb8Smec 63938b464eb8Smec bp1 = kmem_alloc(sizeof (struct page_capture_hash_bucket), KM_SLEEP); 63948b464eb8Smec 63958b464eb8Smec bp1->pp = pp; 63968b464eb8Smec bp1->szc = szc; 63978b464eb8Smec bp1->flags = flags; 63988b464eb8Smec bp1->datap = datap; 63998b464eb8Smec 64008b464eb8Smec for (cb_index = 0; cb_index < PC_NUM_CALLBACKS; cb_index++) { 64018b464eb8Smec if ((flags >> cb_index) & 1) { 64028b464eb8Smec break; 64038b464eb8Smec } 64048b464eb8Smec } 64058b464eb8Smec 64068b464eb8Smec ASSERT(cb_index != PC_NUM_CALLBACKS); 64078b464eb8Smec 64088b464eb8Smec rw_enter(&pc_cb[cb_index].cb_rwlock, RW_READER); 64098b464eb8Smec if (pc_cb[cb_index].cb_active) { 64108b464eb8Smec if (pc_cb[cb_index].duration == -1) { 64118b464eb8Smec bp1->expires = (clock_t)-1; 64128b464eb8Smec } else { 6413d3d50737SRafael Vanoni bp1->expires = ddi_get_lbolt() + 6414d3d50737SRafael Vanoni pc_cb[cb_index].duration; 64158b464eb8Smec } 64168b464eb8Smec } else { 64178b464eb8Smec /* There's no callback registered so don't add to the hash */ 64188b464eb8Smec rw_exit(&pc_cb[cb_index].cb_rwlock); 64198b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 64208b464eb8Smec return; 64218b464eb8Smec } 64228b464eb8Smec 64238b464eb8Smec index = PAGE_CAPTURE_HASH(pp); 64248b464eb8Smec 64258b464eb8Smec /* 64268b464eb8Smec * Only allow capture flag to be modified under this mutex. 64278b464eb8Smec * Prevents multiple entries for same page getting added. 64288b464eb8Smec */ 64298b464eb8Smec mutex_enter(&page_capture_hash[index].pchh_mutex); 64308b464eb8Smec 64318b464eb8Smec /* 64328b464eb8Smec * if not already on the hash, set capture bit and add to the hash 64338b464eb8Smec */ 64348b464eb8Smec if (!(pp->p_toxic & PR_CAPTURE)) { 64358b464eb8Smec #ifdef DEBUG 64368b464eb8Smec /* Check for duplicate entries */ 64378b464eb8Smec for (l = 0; l < 2; l++) { 64388b464eb8Smec tp1 = page_capture_hash[index].lists[l].next; 64398b464eb8Smec while (tp1 != &page_capture_hash[index].lists[l]) { 64408b464eb8Smec if (tp1->pp == pp) { 64418b464eb8Smec panic("page pp 0x%p already on hash " 64428793b36bSNick Todd "at 0x%p\n", 64438793b36bSNick Todd (void *)pp, (void *)tp1); 64448b464eb8Smec } 64458b464eb8Smec tp1 = tp1->next; 64468b464eb8Smec } 64478b464eb8Smec } 64488b464eb8Smec 64498b464eb8Smec #endif 64508b464eb8Smec page_settoxic(pp, PR_CAPTURE); 645111494be0SStan Studzinski pri = PAGE_CAPTURE_PRIO(pp); 645211494be0SStan Studzinski bp1->pri = pri; 64538b464eb8Smec bp1->next = page_capture_hash[index].lists[0].next; 64548b464eb8Smec bp1->prev = &page_capture_hash[index].lists[0]; 64558b464eb8Smec bp1->next->prev = bp1; 64568b464eb8Smec page_capture_hash[index].lists[0].next = bp1; 645711494be0SStan Studzinski page_capture_hash[index].num_pages[pri]++; 6458cee1d74bSjfrank if (flags & CAPTURE_RETIRE) { 6459704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States page_retire_incr_pend_count(datap); 6460cee1d74bSjfrank } 64618b464eb8Smec mutex_exit(&page_capture_hash[index].pchh_mutex); 64628b464eb8Smec rw_exit(&pc_cb[cb_index].cb_rwlock); 64638b464eb8Smec cv_signal(&pc_cv); 64648b464eb8Smec return; 64658b464eb8Smec } 64668b464eb8Smec 64678b464eb8Smec /* 64688b464eb8Smec * A page retire request will replace any other request. 64698b464eb8Smec * A second physmem request which is for a different process than 64708b464eb8Smec * the currently registered one will be dropped as there is 64718b464eb8Smec * no way to hold the private data for both calls. 64728b464eb8Smec * In the future, once there are more callers, this will have to 64738b464eb8Smec * be worked out better as there needs to be private storage for 64748b464eb8Smec * at least each type of caller (maybe have datap be an array of 64758b464eb8Smec * *void's so that we can index based upon callers index). 64768b464eb8Smec */ 64778b464eb8Smec 64788b464eb8Smec /* walk hash list to update expire time */ 64798b464eb8Smec for (i = 0; i < 2; i++) { 64808b464eb8Smec bp2 = page_capture_hash[index].lists[i].next; 64818b464eb8Smec while (bp2 != &page_capture_hash[index].lists[i]) { 64828b464eb8Smec if (bp2->pp == pp) { 64838b464eb8Smec if (flags & CAPTURE_RETIRE) { 64848b464eb8Smec if (!(bp2->flags & CAPTURE_RETIRE)) { 6485704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States page_retire_incr_pend_count( 6486704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States datap); 64878b464eb8Smec bp2->flags = flags; 64888b464eb8Smec bp2->expires = bp1->expires; 64898b464eb8Smec bp2->datap = datap; 64908b464eb8Smec } 64918b464eb8Smec } else { 64928b464eb8Smec ASSERT(flags & CAPTURE_PHYSMEM); 64938b464eb8Smec if (!(bp2->flags & CAPTURE_RETIRE) && 64948b464eb8Smec (datap == bp2->datap)) { 64958b464eb8Smec bp2->expires = bp1->expires; 64968b464eb8Smec } 64978b464eb8Smec } 64988b464eb8Smec mutex_exit(&page_capture_hash[index]. 64998b464eb8Smec pchh_mutex); 65008b464eb8Smec rw_exit(&pc_cb[cb_index].cb_rwlock); 65018b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 65028b464eb8Smec return; 65038b464eb8Smec } 65048b464eb8Smec bp2 = bp2->next; 65058b464eb8Smec } 65068b464eb8Smec } 65078b464eb8Smec 65088b464eb8Smec /* 65098b464eb8Smec * the PR_CAPTURE flag is protected by the page_capture_hash mutexes 65108b464eb8Smec * and thus it either has to be set or not set and can't change 65118b464eb8Smec * while holding the mutex above. 65128b464eb8Smec */ 65138793b36bSNick Todd panic("page_capture_add_hash, PR_CAPTURE flag set on pp %p\n", 65148793b36bSNick Todd (void *)pp); 65158b464eb8Smec } 65168b464eb8Smec 65178b464eb8Smec /* 65188b464eb8Smec * We have a page in our hands, lets try and make it ours by turning 65198b464eb8Smec * it into a clean page like it had just come off the freelists. 65208b464eb8Smec * 65218b464eb8Smec * Returns 0 on success, with the page still EXCL locked. 65228b464eb8Smec * On failure, the page will be unlocked, and returns EAGAIN 65238b464eb8Smec */ 65248b464eb8Smec static int 65258b464eb8Smec page_capture_clean_page(page_t *pp) 65268b464eb8Smec { 65278b464eb8Smec page_t *newpp; 65288b464eb8Smec int skip_unlock = 0; 65298b464eb8Smec spgcnt_t count; 65308b464eb8Smec page_t *tpp; 65318b464eb8Smec int ret = 0; 65328b464eb8Smec int extra; 65338b464eb8Smec 65348b464eb8Smec ASSERT(PAGE_EXCL(pp)); 65358b464eb8Smec ASSERT(!PP_RETIRED(pp)); 65368b464eb8Smec ASSERT(curthread->t_flag & T_CAPTURING); 65378b464eb8Smec 65388b464eb8Smec if (PP_ISFREE(pp)) { 65396e4dd838Smec if (!page_reclaim(pp, NULL)) { 65408b464eb8Smec skip_unlock = 1; 65418b464eb8Smec ret = EAGAIN; 65428b464eb8Smec goto cleanup; 65438b464eb8Smec } 65446e4dd838Smec ASSERT(pp->p_szc == 0); 65458b464eb8Smec if (pp->p_vnode != NULL) { 65468b464eb8Smec /* 65478b464eb8Smec * Since this page came from the 65488b464eb8Smec * cachelist, we must destroy the 65498b464eb8Smec * old vnode association. 65508b464eb8Smec */ 65518b464eb8Smec page_hashout(pp, NULL); 65528b464eb8Smec } 65538b464eb8Smec goto cleanup; 65548b464eb8Smec } 65558b464eb8Smec 65568b464eb8Smec /* 65578b464eb8Smec * If we know page_relocate will fail, skip it 65588b464eb8Smec * It could still fail due to a UE on another page but we 65598b464eb8Smec * can't do anything about that. 65608b464eb8Smec */ 65618b464eb8Smec if (pp->p_toxic & PR_UE) { 65628b464eb8Smec goto skip_relocate; 65638b464eb8Smec } 65648b464eb8Smec 65658b464eb8Smec /* 65668b464eb8Smec * It's possible that pages can not have a vnode as fsflush comes 65678b464eb8Smec * through and cleans up these pages. It's ugly but that's how it is. 65688b464eb8Smec */ 65698b464eb8Smec if (pp->p_vnode == NULL) { 65708b464eb8Smec goto skip_relocate; 65718b464eb8Smec } 65728b464eb8Smec 65738b464eb8Smec /* 65748b464eb8Smec * Page was not free, so lets try to relocate it. 65758b464eb8Smec * page_relocate only works with root pages, so if this is not a root 65768b464eb8Smec * page, we need to demote it to try and relocate it. 65778b464eb8Smec * Unfortunately this is the best we can do right now. 65788b464eb8Smec */ 65798b464eb8Smec newpp = NULL; 65808b464eb8Smec if ((pp->p_szc > 0) && (pp != PP_PAGEROOT(pp))) { 65818b464eb8Smec if (page_try_demote_pages(pp) == 0) { 65828b464eb8Smec ret = EAGAIN; 65838b464eb8Smec goto cleanup; 65848b464eb8Smec } 65858b464eb8Smec } 65868b464eb8Smec ret = page_relocate(&pp, &newpp, 1, 0, &count, NULL); 65878b464eb8Smec if (ret == 0) { 65888b464eb8Smec page_t *npp; 65898b464eb8Smec /* unlock the new page(s) */ 65908b464eb8Smec while (count-- > 0) { 65918b464eb8Smec ASSERT(newpp != NULL); 65928b464eb8Smec npp = newpp; 65938b464eb8Smec page_sub(&newpp, npp); 65948b464eb8Smec page_unlock(npp); 65958b464eb8Smec } 65968b464eb8Smec ASSERT(newpp == NULL); 65978b464eb8Smec /* 65988b464eb8Smec * Check to see if the page we have is too large. 65998b464eb8Smec * If so, demote it freeing up the extra pages. 66008b464eb8Smec */ 66018b464eb8Smec if (pp->p_szc > 0) { 66028b464eb8Smec /* For now demote extra pages to szc == 0 */ 66038b464eb8Smec extra = page_get_pagecnt(pp->p_szc) - 1; 66048b464eb8Smec while (extra > 0) { 66058b464eb8Smec tpp = pp->p_next; 66068b464eb8Smec page_sub(&pp, tpp); 66078b464eb8Smec tpp->p_szc = 0; 66088b464eb8Smec page_free(tpp, 1); 66098b464eb8Smec extra--; 66108b464eb8Smec } 66118b464eb8Smec /* Make sure to set our page to szc 0 as well */ 66128b464eb8Smec ASSERT(pp->p_next == pp && pp->p_prev == pp); 66138b464eb8Smec pp->p_szc = 0; 66148b464eb8Smec } 66158b464eb8Smec goto cleanup; 66168b464eb8Smec } else if (ret == EIO) { 66178b464eb8Smec ret = EAGAIN; 66188b464eb8Smec goto cleanup; 66198b464eb8Smec } else { 66208b464eb8Smec /* 66218b464eb8Smec * Need to reset return type as we failed to relocate the page 66228b464eb8Smec * but that does not mean that some of the next steps will not 66238b464eb8Smec * work. 66248b464eb8Smec */ 66258b464eb8Smec ret = 0; 66268b464eb8Smec } 66278b464eb8Smec 66288b464eb8Smec skip_relocate: 66298b464eb8Smec 66308b464eb8Smec if (pp->p_szc > 0) { 66318b464eb8Smec if (page_try_demote_pages(pp) == 0) { 66328b464eb8Smec ret = EAGAIN; 66338b464eb8Smec goto cleanup; 66348b464eb8Smec } 66358b464eb8Smec } 66368b464eb8Smec 66378b464eb8Smec ASSERT(pp->p_szc == 0); 66388b464eb8Smec 66398b464eb8Smec if (hat_ismod(pp)) { 66408b464eb8Smec ret = EAGAIN; 66418b464eb8Smec goto cleanup; 66428b464eb8Smec } 6643ad23a2dbSjohansen if (PP_ISKAS(pp)) { 66448b464eb8Smec ret = EAGAIN; 66458b464eb8Smec goto cleanup; 66468b464eb8Smec } 66478b464eb8Smec if (pp->p_lckcnt || pp->p_cowcnt) { 66488b464eb8Smec ret = EAGAIN; 66498b464eb8Smec goto cleanup; 66508b464eb8Smec } 66518b464eb8Smec 66528b464eb8Smec (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 66538b464eb8Smec ASSERT(!hat_page_is_mapped(pp)); 66548b464eb8Smec 66558b464eb8Smec if (hat_ismod(pp)) { 66568b464eb8Smec /* 66578b464eb8Smec * This is a semi-odd case as the page is now modified but not 66588b464eb8Smec * mapped as we just unloaded the mappings above. 66598b464eb8Smec */ 66608b464eb8Smec ret = EAGAIN; 66618b464eb8Smec goto cleanup; 66628b464eb8Smec } 66638b464eb8Smec if (pp->p_vnode != NULL) { 66648b464eb8Smec page_hashout(pp, NULL); 66658b464eb8Smec } 66668b464eb8Smec 66678b464eb8Smec /* 66688b464eb8Smec * At this point, the page should be in a clean state and 66698b464eb8Smec * we can do whatever we want with it. 66708b464eb8Smec */ 66718b464eb8Smec 66728b464eb8Smec cleanup: 66738b464eb8Smec if (ret != 0) { 66748b464eb8Smec if (!skip_unlock) { 66758b464eb8Smec page_unlock(pp); 66768b464eb8Smec } 66778b464eb8Smec } else { 66788b464eb8Smec ASSERT(pp->p_szc == 0); 66798b464eb8Smec ASSERT(PAGE_EXCL(pp)); 66808b464eb8Smec 66818b464eb8Smec pp->p_next = pp; 66828b464eb8Smec pp->p_prev = pp; 66838b464eb8Smec } 66848b464eb8Smec return (ret); 66858b464eb8Smec } 66868b464eb8Smec 66878b464eb8Smec /* 66888b464eb8Smec * Various callers of page_trycapture() can have different restrictions upon 66898b464eb8Smec * what memory they have access to. 66908b464eb8Smec * Returns 0 on success, with the following error codes on failure: 66918b464eb8Smec * EPERM - The requested page is long term locked, and thus repeated 66928b464eb8Smec * requests to capture this page will likely fail. 66938b464eb8Smec * ENOMEM - There was not enough free memory in the system to safely 66948b464eb8Smec * map the requested page. 66958b464eb8Smec * ENOENT - The requested page was inside the kernel cage, and the 66968b464eb8Smec * PHYSMEM_CAGE flag was not set. 66978b464eb8Smec */ 66988b464eb8Smec int 66998b464eb8Smec page_capture_pre_checks(page_t *pp, uint_t flags) 67008b464eb8Smec { 67018b464eb8Smec ASSERT(pp != NULL); 67028b464eb8Smec 67038b464eb8Smec #if defined(__sparc) 6704af4c679fSSean McEnroe if (pp->p_vnode == &promvp) { 67058b464eb8Smec return (EPERM); 67068b464eb8Smec } 67078b464eb8Smec 6708a98e9dbfSaguzovsk if (PP_ISNORELOC(pp) && !(flags & CAPTURE_GET_CAGE) && 6709a98e9dbfSaguzovsk (flags & CAPTURE_PHYSMEM)) { 67108b464eb8Smec return (ENOENT); 67118b464eb8Smec } 67128b464eb8Smec 67138b464eb8Smec if (PP_ISNORELOCKERNEL(pp)) { 67148b464eb8Smec return (EPERM); 67158b464eb8Smec } 67168b464eb8Smec #else 6717ad23a2dbSjohansen if (PP_ISKAS(pp)) { 67188b464eb8Smec return (EPERM); 67198b464eb8Smec } 67208b464eb8Smec #endif /* __sparc */ 67218b464eb8Smec 6722a98e9dbfSaguzovsk /* only physmem currently has the restrictions checked below */ 6723a98e9dbfSaguzovsk if (!(flags & CAPTURE_PHYSMEM)) { 6724a98e9dbfSaguzovsk return (0); 6725a98e9dbfSaguzovsk } 6726a98e9dbfSaguzovsk 67278b464eb8Smec if (availrmem < swapfs_minfree) { 67288b464eb8Smec /* 67298b464eb8Smec * We won't try to capture this page as we are 67308b464eb8Smec * running low on memory. 67318b464eb8Smec */ 67328b464eb8Smec return (ENOMEM); 67338b464eb8Smec } 67348b464eb8Smec return (0); 67358b464eb8Smec } 67368b464eb8Smec 67378b464eb8Smec /* 67388b464eb8Smec * Once we have a page in our mits, go ahead and complete the capture 67398b464eb8Smec * operation. 67408b464eb8Smec * Returns 1 on failure where page is no longer needed 67418b464eb8Smec * Returns 0 on success 67428b464eb8Smec * Returns -1 if there was a transient failure. 67438b464eb8Smec * Failure cases must release the SE_EXCL lock on pp (usually via page_free). 67448b464eb8Smec */ 67458b464eb8Smec int 67468b464eb8Smec page_capture_take_action(page_t *pp, uint_t flags, void *datap) 67478b464eb8Smec { 67488b464eb8Smec int cb_index; 67498b464eb8Smec int ret = 0; 67508b464eb8Smec page_capture_hash_bucket_t *bp1; 67518b464eb8Smec page_capture_hash_bucket_t *bp2; 67528b464eb8Smec int index; 67538b464eb8Smec int found = 0; 67548b464eb8Smec int i; 67558b464eb8Smec 67568b464eb8Smec ASSERT(PAGE_EXCL(pp)); 67578b464eb8Smec ASSERT(curthread->t_flag & T_CAPTURING); 67588b464eb8Smec 67598b464eb8Smec for (cb_index = 0; cb_index < PC_NUM_CALLBACKS; cb_index++) { 67608b464eb8Smec if ((flags >> cb_index) & 1) { 67618b464eb8Smec break; 67628b464eb8Smec } 67638b464eb8Smec } 67648b464eb8Smec ASSERT(cb_index < PC_NUM_CALLBACKS); 67658b464eb8Smec 67668b464eb8Smec /* 67678b464eb8Smec * Remove the entry from the page_capture hash, but don't free it yet 67688b464eb8Smec * as we may need to put it back. 67698b464eb8Smec * Since we own the page at this point in time, we should find it 67708b464eb8Smec * in the hash if this is an ASYNC call. If we don't it's likely 67718b464eb8Smec * that the page_capture_async() thread decided that this request 67728b464eb8Smec * had expired, in which case we just continue on. 67738b464eb8Smec */ 67748b464eb8Smec if (flags & CAPTURE_ASYNC) { 67758b464eb8Smec 67768b464eb8Smec index = PAGE_CAPTURE_HASH(pp); 67778b464eb8Smec 67788b464eb8Smec mutex_enter(&page_capture_hash[index].pchh_mutex); 67798b464eb8Smec for (i = 0; i < 2 && !found; i++) { 67808b464eb8Smec bp1 = page_capture_hash[index].lists[i].next; 67818b464eb8Smec while (bp1 != &page_capture_hash[index].lists[i]) { 67828b464eb8Smec if (bp1->pp == pp) { 67838b464eb8Smec bp1->next->prev = bp1->prev; 67848b464eb8Smec bp1->prev->next = bp1->next; 678511494be0SStan Studzinski page_capture_hash[index]. 678611494be0SStan Studzinski num_pages[bp1->pri]--; 67878b464eb8Smec page_clrtoxic(pp, PR_CAPTURE); 67888b464eb8Smec found = 1; 67898b464eb8Smec break; 67908b464eb8Smec } 67918b464eb8Smec bp1 = bp1->next; 67928b464eb8Smec } 67938b464eb8Smec } 67948b464eb8Smec mutex_exit(&page_capture_hash[index].pchh_mutex); 67958b464eb8Smec } 67968b464eb8Smec 67978b464eb8Smec /* Synchronize with the unregister func. */ 67988b464eb8Smec rw_enter(&pc_cb[cb_index].cb_rwlock, RW_READER); 67998b464eb8Smec if (!pc_cb[cb_index].cb_active) { 68008b464eb8Smec page_free(pp, 1); 68018b464eb8Smec rw_exit(&pc_cb[cb_index].cb_rwlock); 68028b464eb8Smec if (found) { 68038b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 68048b464eb8Smec } 68058b464eb8Smec return (1); 68068b464eb8Smec } 68078b464eb8Smec 68088b464eb8Smec /* 68098b464eb8Smec * We need to remove the entry from the page capture hash and turn off 68108b464eb8Smec * the PR_CAPTURE bit before calling the callback. We'll need to cache 68118b464eb8Smec * the entry here, and then based upon the return value, cleanup 68128b464eb8Smec * appropriately or re-add it to the hash, making sure that someone else 68138b464eb8Smec * hasn't already done so. 68148b464eb8Smec * It should be rare for the callback to fail and thus it's ok for 68158b464eb8Smec * the failure path to be a bit complicated as the success path is 68168b464eb8Smec * cleaner and the locking rules are easier to follow. 68178b464eb8Smec */ 68188b464eb8Smec 68198b464eb8Smec ret = pc_cb[cb_index].cb_func(pp, datap, flags); 68208b464eb8Smec 68218b464eb8Smec rw_exit(&pc_cb[cb_index].cb_rwlock); 68228b464eb8Smec 68238b464eb8Smec /* 68248b464eb8Smec * If this was an ASYNC request, we need to cleanup the hash if the 68258b464eb8Smec * callback was successful or if the request was no longer valid. 68268b464eb8Smec * For non-ASYNC requests, we return failure to map and the caller 68278b464eb8Smec * will take care of adding the request to the hash. 68288b464eb8Smec * Note also that the callback itself is responsible for the page 68298b464eb8Smec * at this point in time in terms of locking ... The most common 68308b464eb8Smec * case for the failure path should just be a page_free. 68318b464eb8Smec */ 68328b464eb8Smec if (ret >= 0) { 68338b464eb8Smec if (found) { 6834cee1d74bSjfrank if (bp1->flags & CAPTURE_RETIRE) { 6835704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States page_retire_decr_pend_count(datap); 6836cee1d74bSjfrank } 68378b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 68388b464eb8Smec } 68398b464eb8Smec return (ret); 68408b464eb8Smec } 68418b464eb8Smec if (!found) { 68428b464eb8Smec return (ret); 68438b464eb8Smec } 68448b464eb8Smec 68458b464eb8Smec ASSERT(flags & CAPTURE_ASYNC); 68468b464eb8Smec 68478b464eb8Smec /* 68488b464eb8Smec * Check for expiration time first as we can just free it up if it's 68498b464eb8Smec * expired. 68508b464eb8Smec */ 6851d3d50737SRafael Vanoni if (ddi_get_lbolt() > bp1->expires && bp1->expires != -1) { 68528b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 68538b464eb8Smec return (ret); 68548b464eb8Smec } 68558b464eb8Smec 68568b464eb8Smec /* 68578b464eb8Smec * The callback failed and there used to be an entry in the hash for 68588b464eb8Smec * this page, so we need to add it back to the hash. 68598b464eb8Smec */ 68608b464eb8Smec mutex_enter(&page_capture_hash[index].pchh_mutex); 68618b464eb8Smec if (!(pp->p_toxic & PR_CAPTURE)) { 68628b464eb8Smec /* just add bp1 back to head of walked list */ 68638b464eb8Smec page_settoxic(pp, PR_CAPTURE); 68648b464eb8Smec bp1->next = page_capture_hash[index].lists[1].next; 68658b464eb8Smec bp1->prev = &page_capture_hash[index].lists[1]; 68668b464eb8Smec bp1->next->prev = bp1; 686711494be0SStan Studzinski bp1->pri = PAGE_CAPTURE_PRIO(pp); 68688b464eb8Smec page_capture_hash[index].lists[1].next = bp1; 686911494be0SStan Studzinski page_capture_hash[index].num_pages[bp1->pri]++; 68708b464eb8Smec mutex_exit(&page_capture_hash[index].pchh_mutex); 68718b464eb8Smec return (ret); 68728b464eb8Smec } 68738b464eb8Smec 68748b464eb8Smec /* 68758b464eb8Smec * Otherwise there was a new capture request added to list 68768b464eb8Smec * Need to make sure that our original data is represented if 68778b464eb8Smec * appropriate. 68788b464eb8Smec */ 68798b464eb8Smec for (i = 0; i < 2; i++) { 68808b464eb8Smec bp2 = page_capture_hash[index].lists[i].next; 68818b464eb8Smec while (bp2 != &page_capture_hash[index].lists[i]) { 68828b464eb8Smec if (bp2->pp == pp) { 68838b464eb8Smec if (bp1->flags & CAPTURE_RETIRE) { 68848b464eb8Smec if (!(bp2->flags & CAPTURE_RETIRE)) { 68858b464eb8Smec bp2->szc = bp1->szc; 68868b464eb8Smec bp2->flags = bp1->flags; 68878b464eb8Smec bp2->expires = bp1->expires; 68888b464eb8Smec bp2->datap = bp1->datap; 68898b464eb8Smec } 68908b464eb8Smec } else { 68918b464eb8Smec ASSERT(bp1->flags & CAPTURE_PHYSMEM); 68928b464eb8Smec if (!(bp2->flags & CAPTURE_RETIRE)) { 68938b464eb8Smec bp2->szc = bp1->szc; 68948b464eb8Smec bp2->flags = bp1->flags; 68958b464eb8Smec bp2->expires = bp1->expires; 68968b464eb8Smec bp2->datap = bp1->datap; 68978b464eb8Smec } 68988b464eb8Smec } 689911494be0SStan Studzinski page_capture_hash[index].num_pages[bp2->pri]--; 690011494be0SStan Studzinski bp2->pri = PAGE_CAPTURE_PRIO(pp); 690111494be0SStan Studzinski page_capture_hash[index].num_pages[bp2->pri]++; 69028b464eb8Smec mutex_exit(&page_capture_hash[index]. 69038b464eb8Smec pchh_mutex); 69048b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 69058b464eb8Smec return (ret); 69068b464eb8Smec } 69078b464eb8Smec bp2 = bp2->next; 69088b464eb8Smec } 69098b464eb8Smec } 69108793b36bSNick Todd panic("PR_CAPTURE set but not on hash for pp 0x%p\n", (void *)pp); 69118b464eb8Smec /*NOTREACHED*/ 69128b464eb8Smec } 69138b464eb8Smec 69148b464eb8Smec /* 69158b464eb8Smec * Try to capture the given page for the caller specified in the flags 69168b464eb8Smec * parameter. The page will either be captured and handed over to the 69178b464eb8Smec * appropriate callback, or will be queued up in the page capture hash 69188b464eb8Smec * to be captured asynchronously. 69198b464eb8Smec * If the current request is due to an async capture, the page must be 69208b464eb8Smec * exclusively locked before calling this function. 69218b464eb8Smec * Currently szc must be 0 but in the future this should be expandable to 69228b464eb8Smec * other page sizes. 69238b464eb8Smec * Returns 0 on success, with the following error codes on failure: 69248b464eb8Smec * EPERM - The requested page is long term locked, and thus repeated 69258b464eb8Smec * requests to capture this page will likely fail. 69268b464eb8Smec * ENOMEM - There was not enough free memory in the system to safely 69278b464eb8Smec * map the requested page. 69288b464eb8Smec * ENOENT - The requested page was inside the kernel cage, and the 69298b464eb8Smec * CAPTURE_GET_CAGE flag was not set. 69308b464eb8Smec * EAGAIN - The requested page could not be capturead at this point in 69318b464eb8Smec * time but future requests will likely work. 69328b464eb8Smec * EBUSY - The requested page is retired and the CAPTURE_GET_RETIRED flag 69338b464eb8Smec * was not set. 69348b464eb8Smec */ 69358b464eb8Smec int 69368b464eb8Smec page_itrycapture(page_t *pp, uint_t szc, uint_t flags, void *datap) 69378b464eb8Smec { 69388b464eb8Smec int ret; 69398b464eb8Smec int cb_index; 69408b464eb8Smec 69418b464eb8Smec if (flags & CAPTURE_ASYNC) { 69428b464eb8Smec ASSERT(PAGE_EXCL(pp)); 69438b464eb8Smec goto async; 69448b464eb8Smec } 69458b464eb8Smec 69468b464eb8Smec /* Make sure there's enough availrmem ... */ 69478b464eb8Smec ret = page_capture_pre_checks(pp, flags); 69488b464eb8Smec if (ret != 0) { 69498b464eb8Smec return (ret); 69508b464eb8Smec } 69518b464eb8Smec 69528b464eb8Smec if (!page_trylock(pp, SE_EXCL)) { 69538b464eb8Smec for (cb_index = 0; cb_index < PC_NUM_CALLBACKS; cb_index++) { 69548b464eb8Smec if ((flags >> cb_index) & 1) { 69558b464eb8Smec break; 69568b464eb8Smec } 69578b464eb8Smec } 69588b464eb8Smec ASSERT(cb_index < PC_NUM_CALLBACKS); 69598b464eb8Smec ret = EAGAIN; 69608b464eb8Smec /* Special case for retired pages */ 69618b464eb8Smec if (PP_RETIRED(pp)) { 69628b464eb8Smec if (flags & CAPTURE_GET_RETIRED) { 69638b464eb8Smec if (!page_unretire_pp(pp, PR_UNR_TEMP)) { 69648b464eb8Smec /* 69658b464eb8Smec * Need to set capture bit and add to 69668b464eb8Smec * hash so that the page will be 69678b464eb8Smec * retired when freed. 69688b464eb8Smec */ 69698b464eb8Smec page_capture_add_hash(pp, szc, 69708b464eb8Smec CAPTURE_RETIRE, NULL); 69718b464eb8Smec ret = 0; 69728b464eb8Smec goto own_page; 69738b464eb8Smec } 69748b464eb8Smec } else { 69758b464eb8Smec return (EBUSY); 69768b464eb8Smec } 69778b464eb8Smec } 69788b464eb8Smec page_capture_add_hash(pp, szc, flags, datap); 69798b464eb8Smec return (ret); 69808b464eb8Smec } 69818b464eb8Smec 69828b464eb8Smec async: 69838b464eb8Smec ASSERT(PAGE_EXCL(pp)); 69848b464eb8Smec 69858b464eb8Smec /* Need to check for physmem async requests that availrmem is sane */ 69868b464eb8Smec if ((flags & (CAPTURE_ASYNC | CAPTURE_PHYSMEM)) == 69878b464eb8Smec (CAPTURE_ASYNC | CAPTURE_PHYSMEM) && 69888b464eb8Smec (availrmem < swapfs_minfree)) { 69898b464eb8Smec page_unlock(pp); 69908b464eb8Smec return (ENOMEM); 69918b464eb8Smec } 69928b464eb8Smec 69938b464eb8Smec ret = page_capture_clean_page(pp); 69948b464eb8Smec 69958b464eb8Smec if (ret != 0) { 69968b464eb8Smec /* We failed to get the page, so lets add it to the hash */ 69978b464eb8Smec if (!(flags & CAPTURE_ASYNC)) { 69988b464eb8Smec page_capture_add_hash(pp, szc, flags, datap); 69998b464eb8Smec } 70008b464eb8Smec return (ret); 70018b464eb8Smec } 70028b464eb8Smec 70038b464eb8Smec own_page: 70048b464eb8Smec ASSERT(PAGE_EXCL(pp)); 70058b464eb8Smec ASSERT(pp->p_szc == 0); 70068b464eb8Smec 70078b464eb8Smec /* Call the callback */ 70088b464eb8Smec ret = page_capture_take_action(pp, flags, datap); 70098b464eb8Smec 70108b464eb8Smec if (ret == 0) { 70118b464eb8Smec return (0); 70128b464eb8Smec } 70138b464eb8Smec 70148b464eb8Smec /* 70158b464eb8Smec * Note that in the failure cases from page_capture_take_action, the 70168b464eb8Smec * EXCL lock will have already been dropped. 70178b464eb8Smec */ 70188b464eb8Smec if ((ret == -1) && (!(flags & CAPTURE_ASYNC))) { 70198b464eb8Smec page_capture_add_hash(pp, szc, flags, datap); 70208b464eb8Smec } 70218b464eb8Smec return (EAGAIN); 70228b464eb8Smec } 70238b464eb8Smec 70248b464eb8Smec int 70258b464eb8Smec page_trycapture(page_t *pp, uint_t szc, uint_t flags, void *datap) 70268b464eb8Smec { 70278b464eb8Smec int ret; 70288b464eb8Smec 70298b464eb8Smec curthread->t_flag |= T_CAPTURING; 70308b464eb8Smec ret = page_itrycapture(pp, szc, flags, datap); 70318b464eb8Smec curthread->t_flag &= ~T_CAPTURING; /* xor works as we know its set */ 70328b464eb8Smec return (ret); 70338b464eb8Smec } 70348b464eb8Smec 70358b464eb8Smec /* 70368b464eb8Smec * When unlocking a page which has the PR_CAPTURE bit set, this routine 70378b464eb8Smec * gets called to try and capture the page. 70388b464eb8Smec */ 70398b464eb8Smec void 70408b464eb8Smec page_unlock_capture(page_t *pp) 70418b464eb8Smec { 70428b464eb8Smec page_capture_hash_bucket_t *bp; 70438b464eb8Smec int index; 70448b464eb8Smec int i; 70458b464eb8Smec uint_t szc; 70468b464eb8Smec uint_t flags = 0; 70478b464eb8Smec void *datap; 70488b464eb8Smec kmutex_t *mp; 70498b464eb8Smec extern vnode_t retired_pages; 70508b464eb8Smec 70518b464eb8Smec /* 70528b464eb8Smec * We need to protect against a possible deadlock here where we own 70538b464eb8Smec * the vnode page hash mutex and want to acquire it again as there 70548b464eb8Smec * are locations in the code, where we unlock a page while holding 70558b464eb8Smec * the mutex which can lead to the page being captured and eventually 70568b464eb8Smec * end up here. As we may be hashing out the old page and hashing into 70578b464eb8Smec * the retire vnode, we need to make sure we don't own them. 70588b464eb8Smec * Other callbacks who do hash operations also need to make sure that 70598b464eb8Smec * before they hashin to a vnode that they do not currently own the 70608b464eb8Smec * vphm mutex otherwise there will be a panic. 70618b464eb8Smec */ 70628b464eb8Smec if (mutex_owned(page_vnode_mutex(&retired_pages))) { 706322addef7Smec page_unlock_nocapture(pp); 70648b464eb8Smec return; 70658b464eb8Smec } 70668b464eb8Smec if (pp->p_vnode != NULL && mutex_owned(page_vnode_mutex(pp->p_vnode))) { 706722addef7Smec page_unlock_nocapture(pp); 70688b464eb8Smec return; 70698b464eb8Smec } 70708b464eb8Smec 70718b464eb8Smec index = PAGE_CAPTURE_HASH(pp); 70728b464eb8Smec 70738b464eb8Smec mp = &page_capture_hash[index].pchh_mutex; 70748b464eb8Smec mutex_enter(mp); 70758b464eb8Smec for (i = 0; i < 2; i++) { 70768b464eb8Smec bp = page_capture_hash[index].lists[i].next; 70778b464eb8Smec while (bp != &page_capture_hash[index].lists[i]) { 70788b464eb8Smec if (bp->pp == pp) { 70798b464eb8Smec szc = bp->szc; 70808b464eb8Smec flags = bp->flags | CAPTURE_ASYNC; 70818b464eb8Smec datap = bp->datap; 70828b464eb8Smec mutex_exit(mp); 70838b464eb8Smec (void) page_trycapture(pp, szc, flags, datap); 70848b464eb8Smec return; 70858b464eb8Smec } 70868b464eb8Smec bp = bp->next; 70878b464eb8Smec } 70888b464eb8Smec } 70898b464eb8Smec 70908b464eb8Smec /* Failed to find page in hash so clear flags and unlock it. */ 70918b464eb8Smec page_clrtoxic(pp, PR_CAPTURE); 70928b464eb8Smec page_unlock(pp); 70938b464eb8Smec 70948b464eb8Smec mutex_exit(mp); 70958b464eb8Smec } 70968b464eb8Smec 70978b464eb8Smec void 70988b464eb8Smec page_capture_init() 70998b464eb8Smec { 71008b464eb8Smec int i; 71018b464eb8Smec for (i = 0; i < NUM_PAGE_CAPTURE_BUCKETS; i++) { 71028b464eb8Smec page_capture_hash[i].lists[0].next = 71038b464eb8Smec &page_capture_hash[i].lists[0]; 71048b464eb8Smec page_capture_hash[i].lists[0].prev = 71058b464eb8Smec &page_capture_hash[i].lists[0]; 71068b464eb8Smec page_capture_hash[i].lists[1].next = 71078b464eb8Smec &page_capture_hash[i].lists[1]; 71088b464eb8Smec page_capture_hash[i].lists[1].prev = 71098b464eb8Smec &page_capture_hash[i].lists[1]; 71108b464eb8Smec } 71118b464eb8Smec 71128b464eb8Smec pc_thread_shortwait = 23 * hz; 71138b464eb8Smec pc_thread_longwait = 1201 * hz; 7114a98e9dbfSaguzovsk pc_thread_retry = 3; 71158b464eb8Smec mutex_init(&pc_thread_mutex, NULL, MUTEX_DEFAULT, NULL); 71168b464eb8Smec cv_init(&pc_cv, NULL, CV_DEFAULT, NULL); 71178b464eb8Smec pc_thread_id = thread_create(NULL, 0, page_capture_thread, NULL, 0, &p0, 71188b464eb8Smec TS_RUN, minclsyspri); 71198b464eb8Smec } 71208b464eb8Smec 71218b464eb8Smec /* 71228b464eb8Smec * It is necessary to scrub any failing pages prior to reboot in order to 71238b464eb8Smec * prevent a latent error trap from occurring on the next boot. 71248b464eb8Smec */ 71258b464eb8Smec void 71268b464eb8Smec page_retire_mdboot() 71278b464eb8Smec { 71288b464eb8Smec page_t *pp; 71298b464eb8Smec int i, j; 71308b464eb8Smec page_capture_hash_bucket_t *bp; 713111494be0SStan Studzinski uchar_t pri; 71328b464eb8Smec 71338b464eb8Smec /* walk lists looking for pages to scrub */ 71348b464eb8Smec for (i = 0; i < NUM_PAGE_CAPTURE_BUCKETS; i++) { 713511494be0SStan Studzinski for (pri = 0; pri < PC_NUM_PRI; pri++) { 713611494be0SStan Studzinski if (page_capture_hash[i].num_pages[pri] != 0) { 713711494be0SStan Studzinski break; 713811494be0SStan Studzinski } 713911494be0SStan Studzinski } 714011494be0SStan Studzinski if (pri == PC_NUM_PRI) 71418b464eb8Smec continue; 71428b464eb8Smec 71438b464eb8Smec mutex_enter(&page_capture_hash[i].pchh_mutex); 71448b464eb8Smec 71458b464eb8Smec for (j = 0; j < 2; j++) { 71468b464eb8Smec bp = page_capture_hash[i].lists[j].next; 71478b464eb8Smec while (bp != &page_capture_hash[i].lists[j]) { 71488b464eb8Smec pp = bp->pp; 7149954021b7SJustin Frank if (PP_TOXIC(pp)) { 7150954021b7SJustin Frank if (page_trylock(pp, SE_EXCL)) { 7151954021b7SJustin Frank PP_CLRFREE(pp); 7152954021b7SJustin Frank pagescrub(pp, 0, PAGESIZE); 7153954021b7SJustin Frank page_unlock(pp); 7154954021b7SJustin Frank } 71558b464eb8Smec } 71568b464eb8Smec bp = bp->next; 71578b464eb8Smec } 71588b464eb8Smec } 71598b464eb8Smec mutex_exit(&page_capture_hash[i].pchh_mutex); 71608b464eb8Smec } 71618b464eb8Smec } 71628b464eb8Smec 71638b464eb8Smec /* 71648b464eb8Smec * Walk the page_capture_hash trying to capture pages and also cleanup old 71658b464eb8Smec * entries which have expired. 71668b464eb8Smec */ 71678b464eb8Smec void 71688b464eb8Smec page_capture_async() 71698b464eb8Smec { 71708b464eb8Smec page_t *pp; 71718b464eb8Smec int i; 71728b464eb8Smec int ret; 71738b464eb8Smec page_capture_hash_bucket_t *bp1, *bp2; 71748b464eb8Smec uint_t szc; 71758b464eb8Smec uint_t flags; 71768b464eb8Smec void *datap; 717711494be0SStan Studzinski uchar_t pri; 71788b464eb8Smec 71798b464eb8Smec /* If there are outstanding pages to be captured, get to work */ 71808b464eb8Smec for (i = 0; i < NUM_PAGE_CAPTURE_BUCKETS; i++) { 718111494be0SStan Studzinski for (pri = 0; pri < PC_NUM_PRI; pri++) { 718211494be0SStan Studzinski if (page_capture_hash[i].num_pages[pri] != 0) 718311494be0SStan Studzinski break; 718411494be0SStan Studzinski } 718511494be0SStan Studzinski if (pri == PC_NUM_PRI) 71868b464eb8Smec continue; 718711494be0SStan Studzinski 71888b464eb8Smec /* Append list 1 to list 0 and then walk through list 0 */ 71898b464eb8Smec mutex_enter(&page_capture_hash[i].pchh_mutex); 71908b464eb8Smec bp1 = &page_capture_hash[i].lists[1]; 71918b464eb8Smec bp2 = bp1->next; 71928b464eb8Smec if (bp1 != bp2) { 71938b464eb8Smec bp1->prev->next = page_capture_hash[i].lists[0].next; 71948b464eb8Smec bp2->prev = &page_capture_hash[i].lists[0]; 71958b464eb8Smec page_capture_hash[i].lists[0].next->prev = bp1->prev; 71968b464eb8Smec page_capture_hash[i].lists[0].next = bp2; 71978b464eb8Smec bp1->next = bp1; 71988b464eb8Smec bp1->prev = bp1; 71998b464eb8Smec } 72008b464eb8Smec 72018b464eb8Smec /* list[1] will be empty now */ 72028b464eb8Smec 72038b464eb8Smec bp1 = page_capture_hash[i].lists[0].next; 72048b464eb8Smec while (bp1 != &page_capture_hash[i].lists[0]) { 72058b464eb8Smec /* Check expiration time */ 7206d3d50737SRafael Vanoni if ((ddi_get_lbolt() > bp1->expires && 7207d3d50737SRafael Vanoni bp1->expires != -1) || 72088b464eb8Smec page_deleted(bp1->pp)) { 72098b464eb8Smec page_capture_hash[i].lists[0].next = bp1->next; 72108b464eb8Smec bp1->next->prev = 72118b464eb8Smec &page_capture_hash[i].lists[0]; 721211494be0SStan Studzinski page_capture_hash[i].num_pages[bp1->pri]--; 72138b464eb8Smec 72148b464eb8Smec /* 72158b464eb8Smec * We can safely remove the PR_CAPTURE bit 72168b464eb8Smec * without holding the EXCL lock on the page 72178b464eb8Smec * as the PR_CAPTURE bit requres that the 72188b464eb8Smec * page_capture_hash[].pchh_mutex be held 72198b464eb8Smec * to modify it. 72208b464eb8Smec */ 72218b464eb8Smec page_clrtoxic(bp1->pp, PR_CAPTURE); 72228b464eb8Smec mutex_exit(&page_capture_hash[i].pchh_mutex); 72238b464eb8Smec kmem_free(bp1, sizeof (*bp1)); 72248b464eb8Smec mutex_enter(&page_capture_hash[i].pchh_mutex); 72258b464eb8Smec bp1 = page_capture_hash[i].lists[0].next; 72268b464eb8Smec continue; 72278b464eb8Smec } 72288b464eb8Smec pp = bp1->pp; 72298b464eb8Smec szc = bp1->szc; 72308b464eb8Smec flags = bp1->flags; 72318b464eb8Smec datap = bp1->datap; 72328b464eb8Smec mutex_exit(&page_capture_hash[i].pchh_mutex); 72338b464eb8Smec if (page_trylock(pp, SE_EXCL)) { 72348b464eb8Smec ret = page_trycapture(pp, szc, 72358b464eb8Smec flags | CAPTURE_ASYNC, datap); 72368b464eb8Smec } else { 72378b464eb8Smec ret = 1; /* move to walked hash */ 72388b464eb8Smec } 72398b464eb8Smec 72408b464eb8Smec if (ret != 0) { 72418b464eb8Smec /* Move to walked hash */ 72428b464eb8Smec (void) page_capture_move_to_walked(pp); 72438b464eb8Smec } 72448b464eb8Smec mutex_enter(&page_capture_hash[i].pchh_mutex); 72458b464eb8Smec bp1 = page_capture_hash[i].lists[0].next; 72468b464eb8Smec } 72478b464eb8Smec 72488b464eb8Smec mutex_exit(&page_capture_hash[i].pchh_mutex); 72498b464eb8Smec } 72508b464eb8Smec } 72518b464eb8Smec 7252cee1d74bSjfrank /* 7253cee1d74bSjfrank * This function is called by the page_capture_thread, and is needed in 7254cee1d74bSjfrank * in order to initiate aio cleanup, so that pages used in aio 7255cee1d74bSjfrank * will be unlocked and subsequently retired by page_capture_thread. 7256cee1d74bSjfrank */ 7257cee1d74bSjfrank static int 7258cee1d74bSjfrank do_aio_cleanup(void) 7259cee1d74bSjfrank { 7260cee1d74bSjfrank proc_t *procp; 7261cee1d74bSjfrank int (*aio_cleanup_dr_delete_memory)(proc_t *); 7262cee1d74bSjfrank int cleaned = 0; 7263cee1d74bSjfrank 7264cee1d74bSjfrank if (modload("sys", "kaio") == -1) { 7265cee1d74bSjfrank cmn_err(CE_WARN, "do_aio_cleanup: cannot load kaio"); 7266cee1d74bSjfrank return (0); 7267cee1d74bSjfrank } 7268cee1d74bSjfrank /* 7269cee1d74bSjfrank * We use the aio_cleanup_dr_delete_memory function to 7270cee1d74bSjfrank * initiate the actual clean up; this function will wake 7271cee1d74bSjfrank * up the per-process aio_cleanup_thread. 7272cee1d74bSjfrank */ 7273cee1d74bSjfrank aio_cleanup_dr_delete_memory = (int (*)(proc_t *)) 7274cee1d74bSjfrank modgetsymvalue("aio_cleanup_dr_delete_memory", 0); 7275cee1d74bSjfrank if (aio_cleanup_dr_delete_memory == NULL) { 7276cee1d74bSjfrank cmn_err(CE_WARN, 7277cee1d74bSjfrank "aio_cleanup_dr_delete_memory not found in kaio"); 7278cee1d74bSjfrank return (0); 7279cee1d74bSjfrank } 7280cee1d74bSjfrank mutex_enter(&pidlock); 7281cee1d74bSjfrank for (procp = practive; (procp != NULL); procp = procp->p_next) { 7282cee1d74bSjfrank mutex_enter(&procp->p_lock); 7283cee1d74bSjfrank if (procp->p_aio != NULL) { 7284cee1d74bSjfrank /* cleanup proc's outstanding kaio */ 7285cee1d74bSjfrank cleaned += (*aio_cleanup_dr_delete_memory)(procp); 7286cee1d74bSjfrank } 7287cee1d74bSjfrank mutex_exit(&procp->p_lock); 7288cee1d74bSjfrank } 7289cee1d74bSjfrank mutex_exit(&pidlock); 7290cee1d74bSjfrank return (cleaned); 7291cee1d74bSjfrank } 7292cee1d74bSjfrank 7293cee1d74bSjfrank /* 7294cee1d74bSjfrank * helper function for page_capture_thread 7295cee1d74bSjfrank */ 7296cee1d74bSjfrank static void 7297cee1d74bSjfrank page_capture_handle_outstanding(void) 7298cee1d74bSjfrank { 7299cee1d74bSjfrank int ntry; 7300cee1d74bSjfrank 7301704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States /* Reap pages before attempting capture pages */ 7302704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States kmem_reap(); 7303704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States 7304704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States if ((page_retire_pend_count() > page_retire_pend_kas_count()) && 7305704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States hat_supported(HAT_DYNAMIC_ISM_UNMAP, (void *)0)) { 7306cee1d74bSjfrank /* 7307c2d79585SVijay Balakrishna, SG-RPE * Note: Purging only for platforms that support 7308c2d79585SVijay Balakrishna, SG-RPE * ISM hat_pageunload() - mainly SPARC. On x86/x64 7309c2d79585SVijay Balakrishna, SG-RPE * platforms ISM pages SE_SHARED locked until destroyed. 7310cee1d74bSjfrank */ 7311a98e9dbfSaguzovsk 7312a98e9dbfSaguzovsk /* disable and purge seg_pcache */ 7313a98e9dbfSaguzovsk (void) seg_p_disable(); 7314a98e9dbfSaguzovsk for (ntry = 0; ntry < pc_thread_retry; ntry++) { 7315a98e9dbfSaguzovsk if (!page_retire_pend_count()) 7316a98e9dbfSaguzovsk break; 7317a98e9dbfSaguzovsk if (do_aio_cleanup()) { 7318a98e9dbfSaguzovsk /* 7319a98e9dbfSaguzovsk * allow the apps cleanup threads 7320a98e9dbfSaguzovsk * to run 7321a98e9dbfSaguzovsk */ 7322a98e9dbfSaguzovsk delay(pc_thread_shortwait); 7323cee1d74bSjfrank } 7324cee1d74bSjfrank page_capture_async(); 7325cee1d74bSjfrank } 7326a98e9dbfSaguzovsk /* reenable seg_pcache */ 7327a98e9dbfSaguzovsk seg_p_enable(); 7328704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States 7329704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States /* completed what can be done. break out */ 7330704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States return; 7331cee1d74bSjfrank } 7332704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States 7333704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States /* 7334704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States * For kernel pages and/or unsupported HAT_DYNAMIC_ISM_UNMAP, reap 7335704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States * and then attempt to capture. 7336704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States */ 7337704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States seg_preap(); 7338704b9682SChristopher Baumbauer - Sun Microsystems - San Diego United States page_capture_async(); 7339cee1d74bSjfrank } 7340cee1d74bSjfrank 73418b464eb8Smec /* 73428b464eb8Smec * The page_capture_thread loops forever, looking to see if there are 73438b464eb8Smec * pages still waiting to be captured. 73448b464eb8Smec */ 73458b464eb8Smec static void 73468b464eb8Smec page_capture_thread(void) 73478b464eb8Smec { 73488b464eb8Smec callb_cpr_t c; 73498b464eb8Smec int i; 735011494be0SStan Studzinski int high_pri_pages; 735111494be0SStan Studzinski int low_pri_pages; 735211494be0SStan Studzinski clock_t timeout; 73538b464eb8Smec 73548b464eb8Smec CALLB_CPR_INIT(&c, &pc_thread_mutex, callb_generic_cpr, "page_capture"); 73558b464eb8Smec 73568b464eb8Smec mutex_enter(&pc_thread_mutex); 73578b464eb8Smec for (;;) { 735811494be0SStan Studzinski high_pri_pages = 0; 735911494be0SStan Studzinski low_pri_pages = 0; 736011494be0SStan Studzinski for (i = 0; i < NUM_PAGE_CAPTURE_BUCKETS; i++) { 736111494be0SStan Studzinski high_pri_pages += 736211494be0SStan Studzinski page_capture_hash[i].num_pages[PC_PRI_HI]; 736311494be0SStan Studzinski low_pri_pages += 736411494be0SStan Studzinski page_capture_hash[i].num_pages[PC_PRI_LO]; 736511494be0SStan Studzinski } 736611494be0SStan Studzinski 736711494be0SStan Studzinski timeout = pc_thread_longwait; 736811494be0SStan Studzinski if (high_pri_pages != 0) { 736911494be0SStan Studzinski timeout = pc_thread_shortwait; 7370cee1d74bSjfrank page_capture_handle_outstanding(); 737111494be0SStan Studzinski } else if (low_pri_pages != 0) { 737211494be0SStan Studzinski page_capture_async(); 73738b464eb8Smec } 737411494be0SStan Studzinski CALLB_CPR_SAFE_BEGIN(&c); 737511494be0SStan Studzinski (void) cv_reltimedwait(&pc_cv, &pc_thread_mutex, 737611494be0SStan Studzinski timeout, TR_CLOCK_TICK); 737711494be0SStan Studzinski CALLB_CPR_SAFE_END(&c, &pc_thread_mutex); 73788b464eb8Smec } 73798b464eb8Smec /*NOTREACHED*/ 73808b464eb8Smec } 738106fb6a36Sdv /* 738206fb6a36Sdv * Attempt to locate a bucket that has enough pages to satisfy the request. 738306fb6a36Sdv * The initial check is done without the lock to avoid unneeded contention. 738406fb6a36Sdv * The function returns 1 if enough pages were found, else 0 if it could not 738506fb6a36Sdv * find enough pages in a bucket. 738606fb6a36Sdv */ 738706fb6a36Sdv static int 738806fb6a36Sdv pcf_decrement_bucket(pgcnt_t npages) 738906fb6a36Sdv { 739006fb6a36Sdv struct pcf *p; 739106fb6a36Sdv struct pcf *q; 739206fb6a36Sdv int i; 739306fb6a36Sdv 739406fb6a36Sdv p = &pcf[PCF_INDEX()]; 739506fb6a36Sdv q = &pcf[pcf_fanout]; 739606fb6a36Sdv for (i = 0; i < pcf_fanout; i++) { 739706fb6a36Sdv if (p->pcf_count > npages) { 739806fb6a36Sdv /* 739906fb6a36Sdv * a good one to try. 740006fb6a36Sdv */ 740106fb6a36Sdv mutex_enter(&p->pcf_lock); 740206fb6a36Sdv if (p->pcf_count > npages) { 740306fb6a36Sdv p->pcf_count -= (uint_t)npages; 740406fb6a36Sdv /* 740506fb6a36Sdv * freemem is not protected by any lock. 740606fb6a36Sdv * Thus, we cannot have any assertion 740706fb6a36Sdv * containing freemem here. 740806fb6a36Sdv */ 740906fb6a36Sdv freemem -= npages; 741006fb6a36Sdv mutex_exit(&p->pcf_lock); 741106fb6a36Sdv return (1); 741206fb6a36Sdv } 741306fb6a36Sdv mutex_exit(&p->pcf_lock); 741406fb6a36Sdv } 741506fb6a36Sdv p++; 741606fb6a36Sdv if (p >= q) { 741706fb6a36Sdv p = pcf; 741806fb6a36Sdv } 741906fb6a36Sdv } 742006fb6a36Sdv return (0); 742106fb6a36Sdv } 742206fb6a36Sdv 742306fb6a36Sdv /* 742406fb6a36Sdv * Arguments: 742506fb6a36Sdv * pcftotal_ret: If the value is not NULL and we have walked all the 742606fb6a36Sdv * buckets but did not find enough pages then it will 742706fb6a36Sdv * be set to the total number of pages in all the pcf 742806fb6a36Sdv * buckets. 742906fb6a36Sdv * npages: Is the number of pages we have been requested to 743006fb6a36Sdv * find. 743106fb6a36Sdv * unlock: If set to 0 we will leave the buckets locked if the 743206fb6a36Sdv * requested number of pages are not found. 743306fb6a36Sdv * 743406fb6a36Sdv * Go and try to satisfy the page request from any number of buckets. 743506fb6a36Sdv * This can be a very expensive operation as we have to lock the buckets 743606fb6a36Sdv * we are checking (and keep them locked), starting at bucket 0. 743706fb6a36Sdv * 743806fb6a36Sdv * The function returns 1 if enough pages were found, else 0 if it could not 743906fb6a36Sdv * find enough pages in the buckets. 744006fb6a36Sdv * 744106fb6a36Sdv */ 744206fb6a36Sdv static int 744306fb6a36Sdv pcf_decrement_multiple(pgcnt_t *pcftotal_ret, pgcnt_t npages, int unlock) 744406fb6a36Sdv { 744506fb6a36Sdv struct pcf *p; 744606fb6a36Sdv pgcnt_t pcftotal; 744706fb6a36Sdv int i; 744806fb6a36Sdv 744906fb6a36Sdv p = pcf; 745006fb6a36Sdv /* try to collect pages from several pcf bins */ 745106fb6a36Sdv for (pcftotal = 0, i = 0; i < pcf_fanout; i++) { 745206fb6a36Sdv mutex_enter(&p->pcf_lock); 745306fb6a36Sdv pcftotal += p->pcf_count; 745406fb6a36Sdv if (pcftotal >= npages) { 745506fb6a36Sdv /* 745606fb6a36Sdv * Wow! There are enough pages laying around 745706fb6a36Sdv * to satisfy the request. Do the accounting, 745806fb6a36Sdv * drop the locks we acquired, and go back. 745906fb6a36Sdv * 746006fb6a36Sdv * freemem is not protected by any lock. So, 746106fb6a36Sdv * we cannot have any assertion containing 746206fb6a36Sdv * freemem. 746306fb6a36Sdv */ 746406fb6a36Sdv freemem -= npages; 746506fb6a36Sdv while (p >= pcf) { 746606fb6a36Sdv if (p->pcf_count <= npages) { 746706fb6a36Sdv npages -= p->pcf_count; 746806fb6a36Sdv p->pcf_count = 0; 746906fb6a36Sdv } else { 747006fb6a36Sdv p->pcf_count -= (uint_t)npages; 747106fb6a36Sdv npages = 0; 747206fb6a36Sdv } 747306fb6a36Sdv mutex_exit(&p->pcf_lock); 747406fb6a36Sdv p--; 747506fb6a36Sdv } 747606fb6a36Sdv ASSERT(npages == 0); 747706fb6a36Sdv return (1); 747806fb6a36Sdv } 747906fb6a36Sdv p++; 748006fb6a36Sdv } 748106fb6a36Sdv if (unlock) { 748206fb6a36Sdv /* failed to collect pages - release the locks */ 748306fb6a36Sdv while (--p >= pcf) { 748406fb6a36Sdv mutex_exit(&p->pcf_lock); 748506fb6a36Sdv } 748606fb6a36Sdv } 748706fb6a36Sdv if (pcftotal_ret != NULL) 748806fb6a36Sdv *pcftotal_ret = pcftotal; 748906fb6a36Sdv return (0); 749006fb6a36Sdv } 7491