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 /* 224fc2445aSelowe * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 267c478bd9Sstevel@tonic-gate /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */ 277c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate /* 307c478bd9Sstevel@tonic-gate * University Copyright- Copyright (c) 1982, 1986, 1988 317c478bd9Sstevel@tonic-gate * The Regents of the University of California 327c478bd9Sstevel@tonic-gate * All Rights Reserved 337c478bd9Sstevel@tonic-gate * 347c478bd9Sstevel@tonic-gate * University Acknowledgment- Portions of this document are derived from 357c478bd9Sstevel@tonic-gate * software developed by the University of California, Berkeley, and its 367c478bd9Sstevel@tonic-gate * contributors. 377c478bd9Sstevel@tonic-gate */ 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 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> 80*0209230bSgjelinek #include <sys/vm_usage.h> 817c478bd9Sstevel@tonic-gate #include <fs/fs_subr.h> 827c478bd9Sstevel@tonic-gate 837c478bd9Sstevel@tonic-gate static int nopageage = 0; 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 * 1077c478bd9Sstevel@tonic-gate * segvn_pages_locked : This keeps track on a global basis how many pages 1087c478bd9Sstevel@tonic-gate * are currently locked because of I/O. 1097c478bd9Sstevel@tonic-gate * 1107c478bd9Sstevel@tonic-gate * pages_locked : How many pages are locked becuase of user specified 1117c478bd9Sstevel@tonic-gate * locking through mlock or plock. 1127c478bd9Sstevel@tonic-gate * 1137c478bd9Sstevel@tonic-gate * pages_useclaim,pages_claimed : These two variables track the 1147c478bd9Sstevel@tonic-gate * cliam adjustments because of the protection changes on a segvn segment. 1157c478bd9Sstevel@tonic-gate * 1167c478bd9Sstevel@tonic-gate * All these globals are protected by the same lock which protects availrmem. 1177c478bd9Sstevel@tonic-gate */ 1187c478bd9Sstevel@tonic-gate pgcnt_t segvn_pages_locked; 1197c478bd9Sstevel@tonic-gate pgcnt_t pages_locked; 1207c478bd9Sstevel@tonic-gate pgcnt_t pages_useclaim; 1217c478bd9Sstevel@tonic-gate pgcnt_t pages_claimed; 1227c478bd9Sstevel@tonic-gate 1237c478bd9Sstevel@tonic-gate 1247c478bd9Sstevel@tonic-gate /* 1257c478bd9Sstevel@tonic-gate * new_freemem_lock protects freemem, freemem_wait & freemem_cv. 1267c478bd9Sstevel@tonic-gate */ 1277c478bd9Sstevel@tonic-gate static kmutex_t new_freemem_lock; 1287c478bd9Sstevel@tonic-gate static uint_t freemem_wait; /* someone waiting for freemem */ 1297c478bd9Sstevel@tonic-gate static kcondvar_t freemem_cv; 1307c478bd9Sstevel@tonic-gate 1317c478bd9Sstevel@tonic-gate /* 1327c478bd9Sstevel@tonic-gate * The logical page free list is maintained as two lists, the 'free' 1337c478bd9Sstevel@tonic-gate * and the 'cache' lists. 1347c478bd9Sstevel@tonic-gate * The free list contains those pages that should be reused first. 1357c478bd9Sstevel@tonic-gate * 1367c478bd9Sstevel@tonic-gate * The implementation of the lists is machine dependent. 1377c478bd9Sstevel@tonic-gate * page_get_freelist(), page_get_cachelist(), 1387c478bd9Sstevel@tonic-gate * page_list_sub(), and page_list_add() 1397c478bd9Sstevel@tonic-gate * form the interface to the machine dependent implementation. 1407c478bd9Sstevel@tonic-gate * 1417c478bd9Sstevel@tonic-gate * Pages with p_free set are on the cache list. 1427c478bd9Sstevel@tonic-gate * Pages with p_free and p_age set are on the free list, 1437c478bd9Sstevel@tonic-gate * 1447c478bd9Sstevel@tonic-gate * A page may be locked while on either list. 1457c478bd9Sstevel@tonic-gate */ 1467c478bd9Sstevel@tonic-gate 1477c478bd9Sstevel@tonic-gate /* 1487c478bd9Sstevel@tonic-gate * free list accounting stuff. 1497c478bd9Sstevel@tonic-gate * 1507c478bd9Sstevel@tonic-gate * 1517c478bd9Sstevel@tonic-gate * Spread out the value for the number of pages on the 1527c478bd9Sstevel@tonic-gate * page free and page cache lists. If there is just one 1537c478bd9Sstevel@tonic-gate * value, then it must be under just one lock. 1547c478bd9Sstevel@tonic-gate * The lock contention and cache traffic are a real bother. 1557c478bd9Sstevel@tonic-gate * 1567c478bd9Sstevel@tonic-gate * When we acquire and then drop a single pcf lock 1577c478bd9Sstevel@tonic-gate * we can start in the middle of the array of pcf structures. 1587c478bd9Sstevel@tonic-gate * If we acquire more than one pcf lock at a time, we need to 1597c478bd9Sstevel@tonic-gate * start at the front to avoid deadlocking. 1607c478bd9Sstevel@tonic-gate * 1617c478bd9Sstevel@tonic-gate * pcf_count holds the number of pages in each pool. 1627c478bd9Sstevel@tonic-gate * 1637c478bd9Sstevel@tonic-gate * pcf_block is set when page_create_get_something() has asked the 1647c478bd9Sstevel@tonic-gate * PSM page freelist and page cachelist routines without specifying 1657c478bd9Sstevel@tonic-gate * a color and nothing came back. This is used to block anything 1667c478bd9Sstevel@tonic-gate * else from moving pages from one list to the other while the 1677c478bd9Sstevel@tonic-gate * lists are searched again. If a page is freeed while pcf_block is 1687c478bd9Sstevel@tonic-gate * set, then pcf_reserve is incremented. pcgs_unblock() takes care 1697c478bd9Sstevel@tonic-gate * of clearning pcf_block, doing the wakeups, etc. 1707c478bd9Sstevel@tonic-gate */ 1717c478bd9Sstevel@tonic-gate 1727c478bd9Sstevel@tonic-gate #if NCPU <= 4 173f2b37d75Sfr #define PAD 2 1747c478bd9Sstevel@tonic-gate #define PCF_FANOUT 4 1757c478bd9Sstevel@tonic-gate static uint_t pcf_mask = PCF_FANOUT - 1; 1767c478bd9Sstevel@tonic-gate #else 177f2b37d75Sfr #define PAD 10 1787c478bd9Sstevel@tonic-gate #ifdef sun4v 1797c478bd9Sstevel@tonic-gate #define PCF_FANOUT 32 1807c478bd9Sstevel@tonic-gate #else 1817c478bd9Sstevel@tonic-gate #define PCF_FANOUT 128 1827c478bd9Sstevel@tonic-gate #endif 1837c478bd9Sstevel@tonic-gate static uint_t pcf_mask = PCF_FANOUT - 1; 1847c478bd9Sstevel@tonic-gate #endif 1857c478bd9Sstevel@tonic-gate 1867c478bd9Sstevel@tonic-gate struct pcf { 1877c478bd9Sstevel@tonic-gate kmutex_t pcf_lock; /* protects the structure */ 188f2b37d75Sfr uint_t pcf_count; /* page count */ 1897c478bd9Sstevel@tonic-gate uint_t pcf_wait; /* number of waiters */ 1907c478bd9Sstevel@tonic-gate uint_t pcf_block; /* pcgs flag to page_free() */ 1917c478bd9Sstevel@tonic-gate uint_t pcf_reserve; /* pages freed after pcf_block set */ 1927c478bd9Sstevel@tonic-gate uint_t pcf_fill[PAD]; /* to line up on the caches */ 1937c478bd9Sstevel@tonic-gate }; 1947c478bd9Sstevel@tonic-gate 1957c478bd9Sstevel@tonic-gate static struct pcf pcf[PCF_FANOUT]; 1967c478bd9Sstevel@tonic-gate #define PCF_INDEX() ((CPU->cpu_id) & (pcf_mask)) 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]; 2697c478bd9Sstevel@tonic-gate uint_t alloc_pages[8]; 2707c478bd9Sstevel@tonic-gate uint_t page_exphcontg[19]; 2717c478bd9Sstevel@tonic-gate uint_t page_create_large_cnt[10]; 2727c478bd9Sstevel@tonic-gate 2737c478bd9Sstevel@tonic-gate /* 2747c478bd9Sstevel@tonic-gate * Collects statistics. 2757c478bd9Sstevel@tonic-gate */ 2767c478bd9Sstevel@tonic-gate #define PAGE_HASH_SEARCH(index, pp, vp, off) { \ 2777c478bd9Sstevel@tonic-gate uint_t mylen = 0; \ 2787c478bd9Sstevel@tonic-gate \ 2797c478bd9Sstevel@tonic-gate for ((pp) = page_hash[(index)]; (pp); (pp) = (pp)->p_hash, mylen++) { \ 2807c478bd9Sstevel@tonic-gate if ((pp)->p_vnode == (vp) && (pp)->p_offset == (off)) \ 2817c478bd9Sstevel@tonic-gate break; \ 2827c478bd9Sstevel@tonic-gate } \ 2837c478bd9Sstevel@tonic-gate if ((pp) != NULL) \ 2847c478bd9Sstevel@tonic-gate pagecnt.pc_find_hit++; \ 2857c478bd9Sstevel@tonic-gate else \ 2867c478bd9Sstevel@tonic-gate pagecnt.pc_find_miss++; \ 2877c478bd9Sstevel@tonic-gate if (mylen > PC_HASH_CNT) \ 2887c478bd9Sstevel@tonic-gate mylen = PC_HASH_CNT; \ 2897c478bd9Sstevel@tonic-gate pagecnt.pc_find_hashlen[mylen]++; \ 2907c478bd9Sstevel@tonic-gate } 2917c478bd9Sstevel@tonic-gate 2927c478bd9Sstevel@tonic-gate #else /* VM_STATS */ 2937c478bd9Sstevel@tonic-gate 2947c478bd9Sstevel@tonic-gate /* 2957c478bd9Sstevel@tonic-gate * Don't collect statistics 2967c478bd9Sstevel@tonic-gate */ 2977c478bd9Sstevel@tonic-gate #define PAGE_HASH_SEARCH(index, pp, vp, off) { \ 2987c478bd9Sstevel@tonic-gate for ((pp) = page_hash[(index)]; (pp); (pp) = (pp)->p_hash) { \ 2997c478bd9Sstevel@tonic-gate if ((pp)->p_vnode == (vp) && (pp)->p_offset == (off)) \ 3007c478bd9Sstevel@tonic-gate break; \ 3017c478bd9Sstevel@tonic-gate } \ 3027c478bd9Sstevel@tonic-gate } 3037c478bd9Sstevel@tonic-gate 3047c478bd9Sstevel@tonic-gate #endif /* VM_STATS */ 3057c478bd9Sstevel@tonic-gate 3067c478bd9Sstevel@tonic-gate 3077c478bd9Sstevel@tonic-gate 3087c478bd9Sstevel@tonic-gate #ifdef DEBUG 3097c478bd9Sstevel@tonic-gate #define MEMSEG_SEARCH_STATS 3107c478bd9Sstevel@tonic-gate #endif 3117c478bd9Sstevel@tonic-gate 3127c478bd9Sstevel@tonic-gate #ifdef MEMSEG_SEARCH_STATS 3137c478bd9Sstevel@tonic-gate struct memseg_stats { 3147c478bd9Sstevel@tonic-gate uint_t nsearch; 3157c478bd9Sstevel@tonic-gate uint_t nlastwon; 3167c478bd9Sstevel@tonic-gate uint_t nhashwon; 3177c478bd9Sstevel@tonic-gate uint_t nnotfound; 3187c478bd9Sstevel@tonic-gate } memseg_stats; 3197c478bd9Sstevel@tonic-gate 3207c478bd9Sstevel@tonic-gate #define MEMSEG_STAT_INCR(v) \ 3217c478bd9Sstevel@tonic-gate atomic_add_32(&memseg_stats.v, 1) 3227c478bd9Sstevel@tonic-gate #else 3237c478bd9Sstevel@tonic-gate #define MEMSEG_STAT_INCR(x) 3247c478bd9Sstevel@tonic-gate #endif 3257c478bd9Sstevel@tonic-gate 3267c478bd9Sstevel@tonic-gate struct memseg *memsegs; /* list of memory segments */ 3277c478bd9Sstevel@tonic-gate 3287c478bd9Sstevel@tonic-gate 3297c478bd9Sstevel@tonic-gate static void page_init_mem_config(void); 3307c478bd9Sstevel@tonic-gate static int page_do_hashin(page_t *, vnode_t *, u_offset_t); 3317c478bd9Sstevel@tonic-gate static void page_do_hashout(page_t *); 3327c478bd9Sstevel@tonic-gate 3337c478bd9Sstevel@tonic-gate static void page_demote_vp_pages(page_t *); 3347c478bd9Sstevel@tonic-gate 3357c478bd9Sstevel@tonic-gate /* 3367c478bd9Sstevel@tonic-gate * vm subsystem related initialization 3377c478bd9Sstevel@tonic-gate */ 3387c478bd9Sstevel@tonic-gate void 3397c478bd9Sstevel@tonic-gate vm_init(void) 3407c478bd9Sstevel@tonic-gate { 3417c478bd9Sstevel@tonic-gate boolean_t callb_vm_cpr(void *, int); 3427c478bd9Sstevel@tonic-gate 3437c478bd9Sstevel@tonic-gate (void) callb_add(callb_vm_cpr, 0, CB_CL_CPR_VM, "vm"); 3447c478bd9Sstevel@tonic-gate page_init_mem_config(); 345db874c57Selowe page_retire_init(); 346*0209230bSgjelinek vm_usage_init(); 3477c478bd9Sstevel@tonic-gate } 3487c478bd9Sstevel@tonic-gate 3497c478bd9Sstevel@tonic-gate /* 3507c478bd9Sstevel@tonic-gate * This function is called at startup and when memory is added or deleted. 3517c478bd9Sstevel@tonic-gate */ 3527c478bd9Sstevel@tonic-gate void 3537c478bd9Sstevel@tonic-gate init_pages_pp_maximum() 3547c478bd9Sstevel@tonic-gate { 3557c478bd9Sstevel@tonic-gate static pgcnt_t p_min; 3567c478bd9Sstevel@tonic-gate static pgcnt_t pages_pp_maximum_startup; 3577c478bd9Sstevel@tonic-gate static pgcnt_t avrmem_delta; 3587c478bd9Sstevel@tonic-gate static int init_done; 3597c478bd9Sstevel@tonic-gate static int user_set; /* true if set in /etc/system */ 3607c478bd9Sstevel@tonic-gate 3617c478bd9Sstevel@tonic-gate if (init_done == 0) { 3627c478bd9Sstevel@tonic-gate 3637c478bd9Sstevel@tonic-gate /* If the user specified a value, save it */ 3647c478bd9Sstevel@tonic-gate if (pages_pp_maximum != 0) { 3657c478bd9Sstevel@tonic-gate user_set = 1; 3667c478bd9Sstevel@tonic-gate pages_pp_maximum_startup = pages_pp_maximum; 3677c478bd9Sstevel@tonic-gate } 3687c478bd9Sstevel@tonic-gate 3697c478bd9Sstevel@tonic-gate /* 3707c478bd9Sstevel@tonic-gate * Setting of pages_pp_maximum is based first time 3717c478bd9Sstevel@tonic-gate * on the value of availrmem just after the start-up 3727c478bd9Sstevel@tonic-gate * allocations. To preserve this relationship at run 3737c478bd9Sstevel@tonic-gate * time, use a delta from availrmem_initial. 3747c478bd9Sstevel@tonic-gate */ 3757c478bd9Sstevel@tonic-gate ASSERT(availrmem_initial >= availrmem); 3767c478bd9Sstevel@tonic-gate avrmem_delta = availrmem_initial - availrmem; 3777c478bd9Sstevel@tonic-gate 3787c478bd9Sstevel@tonic-gate /* The allowable floor of pages_pp_maximum */ 3797c478bd9Sstevel@tonic-gate p_min = tune.t_minarmem + 100; 3807c478bd9Sstevel@tonic-gate 3817c478bd9Sstevel@tonic-gate /* Make sure we don't come through here again. */ 3827c478bd9Sstevel@tonic-gate init_done = 1; 3837c478bd9Sstevel@tonic-gate } 3847c478bd9Sstevel@tonic-gate /* 3857c478bd9Sstevel@tonic-gate * Determine pages_pp_maximum, the number of currently available 3867c478bd9Sstevel@tonic-gate * pages (availrmem) that can't be `locked'. If not set by 3877c478bd9Sstevel@tonic-gate * the user, we set it to 4% of the currently available memory 3887c478bd9Sstevel@tonic-gate * plus 4MB. 3897c478bd9Sstevel@tonic-gate * But we also insist that it be greater than tune.t_minarmem; 3907c478bd9Sstevel@tonic-gate * otherwise a process could lock down a lot of memory, get swapped 3917c478bd9Sstevel@tonic-gate * out, and never have enough to get swapped back in. 3927c478bd9Sstevel@tonic-gate */ 3937c478bd9Sstevel@tonic-gate if (user_set) 3947c478bd9Sstevel@tonic-gate pages_pp_maximum = pages_pp_maximum_startup; 3957c478bd9Sstevel@tonic-gate else 3967c478bd9Sstevel@tonic-gate pages_pp_maximum = ((availrmem_initial - avrmem_delta) / 25) 3977c478bd9Sstevel@tonic-gate + btop(4 * 1024 * 1024); 3987c478bd9Sstevel@tonic-gate 3997c478bd9Sstevel@tonic-gate if (pages_pp_maximum <= p_min) { 4007c478bd9Sstevel@tonic-gate pages_pp_maximum = p_min; 4017c478bd9Sstevel@tonic-gate } 4027c478bd9Sstevel@tonic-gate } 4037c478bd9Sstevel@tonic-gate 4047c478bd9Sstevel@tonic-gate void 4057c478bd9Sstevel@tonic-gate set_max_page_get(pgcnt_t target_total_pages) 4067c478bd9Sstevel@tonic-gate { 4077c478bd9Sstevel@tonic-gate max_page_get = target_total_pages / 2; 4087c478bd9Sstevel@tonic-gate } 4097c478bd9Sstevel@tonic-gate 4107c478bd9Sstevel@tonic-gate static pgcnt_t pending_delete; 4117c478bd9Sstevel@tonic-gate 4127c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 4137c478bd9Sstevel@tonic-gate static void 4147c478bd9Sstevel@tonic-gate page_mem_config_post_add( 4157c478bd9Sstevel@tonic-gate void *arg, 4167c478bd9Sstevel@tonic-gate pgcnt_t delta_pages) 4177c478bd9Sstevel@tonic-gate { 4187c478bd9Sstevel@tonic-gate set_max_page_get(total_pages - pending_delete); 4197c478bd9Sstevel@tonic-gate init_pages_pp_maximum(); 4207c478bd9Sstevel@tonic-gate } 4217c478bd9Sstevel@tonic-gate 4227c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 4237c478bd9Sstevel@tonic-gate static int 4247c478bd9Sstevel@tonic-gate page_mem_config_pre_del( 4257c478bd9Sstevel@tonic-gate void *arg, 4267c478bd9Sstevel@tonic-gate pgcnt_t delta_pages) 4277c478bd9Sstevel@tonic-gate { 4287c478bd9Sstevel@tonic-gate pgcnt_t nv; 4297c478bd9Sstevel@tonic-gate 4307c478bd9Sstevel@tonic-gate nv = atomic_add_long_nv(&pending_delete, (spgcnt_t)delta_pages); 4317c478bd9Sstevel@tonic-gate set_max_page_get(total_pages - nv); 4327c478bd9Sstevel@tonic-gate return (0); 4337c478bd9Sstevel@tonic-gate } 4347c478bd9Sstevel@tonic-gate 4357c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 4367c478bd9Sstevel@tonic-gate static void 4377c478bd9Sstevel@tonic-gate page_mem_config_post_del( 4387c478bd9Sstevel@tonic-gate void *arg, 4397c478bd9Sstevel@tonic-gate pgcnt_t delta_pages, 4407c478bd9Sstevel@tonic-gate int cancelled) 4417c478bd9Sstevel@tonic-gate { 4427c478bd9Sstevel@tonic-gate pgcnt_t nv; 4437c478bd9Sstevel@tonic-gate 4447c478bd9Sstevel@tonic-gate nv = atomic_add_long_nv(&pending_delete, -(spgcnt_t)delta_pages); 4457c478bd9Sstevel@tonic-gate set_max_page_get(total_pages - nv); 4467c478bd9Sstevel@tonic-gate if (!cancelled) 4477c478bd9Sstevel@tonic-gate init_pages_pp_maximum(); 4487c478bd9Sstevel@tonic-gate } 4497c478bd9Sstevel@tonic-gate 4507c478bd9Sstevel@tonic-gate static kphysm_setup_vector_t page_mem_config_vec = { 4517c478bd9Sstevel@tonic-gate KPHYSM_SETUP_VECTOR_VERSION, 4527c478bd9Sstevel@tonic-gate page_mem_config_post_add, 4537c478bd9Sstevel@tonic-gate page_mem_config_pre_del, 4547c478bd9Sstevel@tonic-gate page_mem_config_post_del, 4557c478bd9Sstevel@tonic-gate }; 4567c478bd9Sstevel@tonic-gate 4577c478bd9Sstevel@tonic-gate static void 4587c478bd9Sstevel@tonic-gate page_init_mem_config(void) 4597c478bd9Sstevel@tonic-gate { 4607c478bd9Sstevel@tonic-gate int ret; 4617c478bd9Sstevel@tonic-gate 4627c478bd9Sstevel@tonic-gate ret = kphysm_setup_func_register(&page_mem_config_vec, (void *)NULL); 4637c478bd9Sstevel@tonic-gate ASSERT(ret == 0); 4647c478bd9Sstevel@tonic-gate } 4657c478bd9Sstevel@tonic-gate 4667c478bd9Sstevel@tonic-gate /* 4677c478bd9Sstevel@tonic-gate * Evenly spread out the PCF counters for large free pages 4687c478bd9Sstevel@tonic-gate */ 4697c478bd9Sstevel@tonic-gate static void 4707c478bd9Sstevel@tonic-gate page_free_large_ctr(pgcnt_t npages) 4717c478bd9Sstevel@tonic-gate { 4727c478bd9Sstevel@tonic-gate static struct pcf *p = pcf; 4737c478bd9Sstevel@tonic-gate pgcnt_t lump; 4747c478bd9Sstevel@tonic-gate 4757c478bd9Sstevel@tonic-gate freemem += npages; 4767c478bd9Sstevel@tonic-gate 4777c478bd9Sstevel@tonic-gate lump = roundup(npages, PCF_FANOUT) / PCF_FANOUT; 4787c478bd9Sstevel@tonic-gate 4797c478bd9Sstevel@tonic-gate while (npages > 0) { 4807c478bd9Sstevel@tonic-gate 4817c478bd9Sstevel@tonic-gate ASSERT(!p->pcf_block); 4827c478bd9Sstevel@tonic-gate 4837c478bd9Sstevel@tonic-gate if (lump < npages) { 4847c478bd9Sstevel@tonic-gate p->pcf_count += (uint_t)lump; 4857c478bd9Sstevel@tonic-gate npages -= lump; 4867c478bd9Sstevel@tonic-gate } else { 4877c478bd9Sstevel@tonic-gate p->pcf_count += (uint_t)npages; 4887c478bd9Sstevel@tonic-gate npages = 0; 4897c478bd9Sstevel@tonic-gate } 4907c478bd9Sstevel@tonic-gate 4917c478bd9Sstevel@tonic-gate ASSERT(!p->pcf_wait); 4927c478bd9Sstevel@tonic-gate 4937c478bd9Sstevel@tonic-gate if (++p > &pcf[PCF_FANOUT - 1]) 4947c478bd9Sstevel@tonic-gate p = pcf; 4957c478bd9Sstevel@tonic-gate } 4967c478bd9Sstevel@tonic-gate 4977c478bd9Sstevel@tonic-gate ASSERT(npages == 0); 4987c478bd9Sstevel@tonic-gate } 4997c478bd9Sstevel@tonic-gate 5007c478bd9Sstevel@tonic-gate /* 5017c478bd9Sstevel@tonic-gate * Add a physical chunk of memory to the system freee lists during startup. 5027c478bd9Sstevel@tonic-gate * Platform specific startup() allocates the memory for the page structs. 5037c478bd9Sstevel@tonic-gate * 5047c478bd9Sstevel@tonic-gate * num - number of page structures 5057c478bd9Sstevel@tonic-gate * base - page number (pfn) to be associated with the first page. 5067c478bd9Sstevel@tonic-gate * 5077c478bd9Sstevel@tonic-gate * Since we are doing this during startup (ie. single threaded), we will 5087c478bd9Sstevel@tonic-gate * use shortcut routines to avoid any locking overhead while putting all 5097c478bd9Sstevel@tonic-gate * these pages on the freelists. 5107c478bd9Sstevel@tonic-gate * 5117c478bd9Sstevel@tonic-gate * NOTE: Any changes performed to page_free(), must also be performed to 5127c478bd9Sstevel@tonic-gate * add_physmem() since this is how we initialize all page_t's at 5137c478bd9Sstevel@tonic-gate * boot time. 5147c478bd9Sstevel@tonic-gate */ 5157c478bd9Sstevel@tonic-gate void 5167c478bd9Sstevel@tonic-gate add_physmem( 5177c478bd9Sstevel@tonic-gate page_t *pp, 5187c478bd9Sstevel@tonic-gate pgcnt_t num, 5197c478bd9Sstevel@tonic-gate pfn_t pnum) 5207c478bd9Sstevel@tonic-gate { 5217c478bd9Sstevel@tonic-gate page_t *root = NULL; 5227c478bd9Sstevel@tonic-gate uint_t szc = page_num_pagesizes() - 1; 5237c478bd9Sstevel@tonic-gate pgcnt_t large = page_get_pagecnt(szc); 5247c478bd9Sstevel@tonic-gate pgcnt_t cnt = 0; 5257c478bd9Sstevel@tonic-gate 5267c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_INIT, 5277c478bd9Sstevel@tonic-gate "add_physmem:pp %p num %lu", pp, num); 5287c478bd9Sstevel@tonic-gate 5297c478bd9Sstevel@tonic-gate /* 5307c478bd9Sstevel@tonic-gate * Arbitrarily limit the max page_get request 5317c478bd9Sstevel@tonic-gate * to 1/2 of the page structs we have. 5327c478bd9Sstevel@tonic-gate */ 5337c478bd9Sstevel@tonic-gate total_pages += num; 5347c478bd9Sstevel@tonic-gate set_max_page_get(total_pages); 5357c478bd9Sstevel@tonic-gate 536e21bae1bSkchow PLCNT_MODIFY_MAX(pnum, (long)num); 537e21bae1bSkchow 5387c478bd9Sstevel@tonic-gate /* 5397c478bd9Sstevel@tonic-gate * The physical space for the pages array 5407c478bd9Sstevel@tonic-gate * representing ram pages has already been 5417c478bd9Sstevel@tonic-gate * allocated. Here we initialize each lock 5427c478bd9Sstevel@tonic-gate * in the page structure, and put each on 5437c478bd9Sstevel@tonic-gate * the free list 5447c478bd9Sstevel@tonic-gate */ 545affbd3ccSkchow for (; num; pp++, pnum++, num--) { 5467c478bd9Sstevel@tonic-gate 5477c478bd9Sstevel@tonic-gate /* 5487c478bd9Sstevel@tonic-gate * this needs to fill in the page number 5497c478bd9Sstevel@tonic-gate * and do any other arch specific initialization 5507c478bd9Sstevel@tonic-gate */ 5517c478bd9Sstevel@tonic-gate add_physmem_cb(pp, pnum); 5527c478bd9Sstevel@tonic-gate 55307b65a64Saguzovsk pp->p_lckcnt = 0; 55407b65a64Saguzovsk pp->p_cowcnt = 0; 55507b65a64Saguzovsk pp->p_slckcnt = 0; 55607b65a64Saguzovsk 5577c478bd9Sstevel@tonic-gate /* 5587c478bd9Sstevel@tonic-gate * Initialize the page lock as unlocked, since nobody 5597c478bd9Sstevel@tonic-gate * can see or access this page yet. 5607c478bd9Sstevel@tonic-gate */ 5617c478bd9Sstevel@tonic-gate pp->p_selock = 0; 5627c478bd9Sstevel@tonic-gate 5637c478bd9Sstevel@tonic-gate /* 5647c478bd9Sstevel@tonic-gate * Initialize IO lock 5657c478bd9Sstevel@tonic-gate */ 5667c478bd9Sstevel@tonic-gate page_iolock_init(pp); 5677c478bd9Sstevel@tonic-gate 5687c478bd9Sstevel@tonic-gate /* 5697c478bd9Sstevel@tonic-gate * initialize other fields in the page_t 5707c478bd9Sstevel@tonic-gate */ 5717c478bd9Sstevel@tonic-gate PP_SETFREE(pp); 5727c478bd9Sstevel@tonic-gate page_clr_all_props(pp); 5737c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 5747c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)-1; 5757c478bd9Sstevel@tonic-gate pp->p_next = pp; 5767c478bd9Sstevel@tonic-gate pp->p_prev = pp; 5777c478bd9Sstevel@tonic-gate 5787c478bd9Sstevel@tonic-gate /* 5797c478bd9Sstevel@tonic-gate * Simple case: System doesn't support large pages. 5807c478bd9Sstevel@tonic-gate */ 5817c478bd9Sstevel@tonic-gate if (szc == 0) { 5827c478bd9Sstevel@tonic-gate pp->p_szc = 0; 5837c478bd9Sstevel@tonic-gate page_free_at_startup(pp); 5847c478bd9Sstevel@tonic-gate continue; 5857c478bd9Sstevel@tonic-gate } 5867c478bd9Sstevel@tonic-gate 5877c478bd9Sstevel@tonic-gate /* 5887c478bd9Sstevel@tonic-gate * Handle unaligned pages, we collect them up onto 5897c478bd9Sstevel@tonic-gate * the root page until we have a full large page. 5907c478bd9Sstevel@tonic-gate */ 5917c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pnum, large)) { 5927c478bd9Sstevel@tonic-gate 5937c478bd9Sstevel@tonic-gate /* 5947c478bd9Sstevel@tonic-gate * If not in a large page, 5957c478bd9Sstevel@tonic-gate * just free as small page. 5967c478bd9Sstevel@tonic-gate */ 5977c478bd9Sstevel@tonic-gate if (root == NULL) { 5987c478bd9Sstevel@tonic-gate pp->p_szc = 0; 5997c478bd9Sstevel@tonic-gate page_free_at_startup(pp); 6007c478bd9Sstevel@tonic-gate continue; 6017c478bd9Sstevel@tonic-gate } 6027c478bd9Sstevel@tonic-gate 6037c478bd9Sstevel@tonic-gate /* 6047c478bd9Sstevel@tonic-gate * Link a constituent page into the large page. 6057c478bd9Sstevel@tonic-gate */ 6067c478bd9Sstevel@tonic-gate pp->p_szc = szc; 6077c478bd9Sstevel@tonic-gate page_list_concat(&root, &pp); 6087c478bd9Sstevel@tonic-gate 6097c478bd9Sstevel@tonic-gate /* 6107c478bd9Sstevel@tonic-gate * When large page is fully formed, free it. 6117c478bd9Sstevel@tonic-gate */ 6127c478bd9Sstevel@tonic-gate if (++cnt == large) { 6137c478bd9Sstevel@tonic-gate page_free_large_ctr(cnt); 6147c478bd9Sstevel@tonic-gate page_list_add_pages(root, PG_LIST_ISINIT); 6157c478bd9Sstevel@tonic-gate root = NULL; 6167c478bd9Sstevel@tonic-gate cnt = 0; 6177c478bd9Sstevel@tonic-gate } 6187c478bd9Sstevel@tonic-gate continue; 6197c478bd9Sstevel@tonic-gate } 6207c478bd9Sstevel@tonic-gate 6217c478bd9Sstevel@tonic-gate /* 6227c478bd9Sstevel@tonic-gate * At this point we have a page number which 6237c478bd9Sstevel@tonic-gate * is aligned. We assert that we aren't already 6247c478bd9Sstevel@tonic-gate * in a different large page. 6257c478bd9Sstevel@tonic-gate */ 6267c478bd9Sstevel@tonic-gate ASSERT(IS_P2ALIGNED(pnum, large)); 6277c478bd9Sstevel@tonic-gate ASSERT(root == NULL && cnt == 0); 6287c478bd9Sstevel@tonic-gate 6297c478bd9Sstevel@tonic-gate /* 6307c478bd9Sstevel@tonic-gate * If insufficient number of pages left to form 6317c478bd9Sstevel@tonic-gate * a large page, just free the small page. 6327c478bd9Sstevel@tonic-gate */ 6337c478bd9Sstevel@tonic-gate if (num < large) { 6347c478bd9Sstevel@tonic-gate pp->p_szc = 0; 6357c478bd9Sstevel@tonic-gate page_free_at_startup(pp); 6367c478bd9Sstevel@tonic-gate continue; 6377c478bd9Sstevel@tonic-gate } 6387c478bd9Sstevel@tonic-gate 6397c478bd9Sstevel@tonic-gate /* 6407c478bd9Sstevel@tonic-gate * Otherwise start a new large page. 6417c478bd9Sstevel@tonic-gate */ 6427c478bd9Sstevel@tonic-gate pp->p_szc = szc; 6437c478bd9Sstevel@tonic-gate cnt++; 6447c478bd9Sstevel@tonic-gate root = pp; 6457c478bd9Sstevel@tonic-gate } 6467c478bd9Sstevel@tonic-gate ASSERT(root == NULL && cnt == 0); 6477c478bd9Sstevel@tonic-gate } 6487c478bd9Sstevel@tonic-gate 6497c478bd9Sstevel@tonic-gate /* 6507c478bd9Sstevel@tonic-gate * Find a page representing the specified [vp, offset]. 6517c478bd9Sstevel@tonic-gate * If we find the page but it is intransit coming in, 6527c478bd9Sstevel@tonic-gate * it will have an "exclusive" lock and we wait for 6537c478bd9Sstevel@tonic-gate * the i/o to complete. A page found on the free list 6547c478bd9Sstevel@tonic-gate * is always reclaimed and then locked. On success, the page 6557c478bd9Sstevel@tonic-gate * is locked, its data is valid and it isn't on the free 6567c478bd9Sstevel@tonic-gate * list, while a NULL is returned if the page doesn't exist. 6577c478bd9Sstevel@tonic-gate */ 6587c478bd9Sstevel@tonic-gate page_t * 6597c478bd9Sstevel@tonic-gate page_lookup(vnode_t *vp, u_offset_t off, se_t se) 6607c478bd9Sstevel@tonic-gate { 6617c478bd9Sstevel@tonic-gate return (page_lookup_create(vp, off, se, NULL, NULL, 0)); 6627c478bd9Sstevel@tonic-gate } 6637c478bd9Sstevel@tonic-gate 6647c478bd9Sstevel@tonic-gate /* 6657c478bd9Sstevel@tonic-gate * Find a page representing the specified [vp, offset]. 6667c478bd9Sstevel@tonic-gate * We either return the one we found or, if passed in, 6677c478bd9Sstevel@tonic-gate * create one with identity of [vp, offset] of the 6687c478bd9Sstevel@tonic-gate * pre-allocated page. If we find exsisting page but it is 6697c478bd9Sstevel@tonic-gate * intransit coming in, it will have an "exclusive" lock 6707c478bd9Sstevel@tonic-gate * and we wait for the i/o to complete. A page found on 6717c478bd9Sstevel@tonic-gate * the free list is always reclaimed and then locked. 6727c478bd9Sstevel@tonic-gate * On success, the page is locked, its data is valid and 6737c478bd9Sstevel@tonic-gate * it isn't on the free list, while a NULL is returned 6747c478bd9Sstevel@tonic-gate * if the page doesn't exist and newpp is NULL; 6757c478bd9Sstevel@tonic-gate */ 6767c478bd9Sstevel@tonic-gate page_t * 6777c478bd9Sstevel@tonic-gate page_lookup_create( 6787c478bd9Sstevel@tonic-gate vnode_t *vp, 6797c478bd9Sstevel@tonic-gate u_offset_t off, 6807c478bd9Sstevel@tonic-gate se_t se, 6817c478bd9Sstevel@tonic-gate page_t *newpp, 6827c478bd9Sstevel@tonic-gate spgcnt_t *nrelocp, 6837c478bd9Sstevel@tonic-gate int flags) 6847c478bd9Sstevel@tonic-gate { 6857c478bd9Sstevel@tonic-gate page_t *pp; 6867c478bd9Sstevel@tonic-gate kmutex_t *phm; 6877c478bd9Sstevel@tonic-gate ulong_t index; 6887c478bd9Sstevel@tonic-gate uint_t hash_locked; 6897c478bd9Sstevel@tonic-gate uint_t es; 6907c478bd9Sstevel@tonic-gate 6917c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 6927c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[0]); 6937c478bd9Sstevel@tonic-gate ASSERT(newpp ? PAGE_EXCL(newpp) : 1); 6947c478bd9Sstevel@tonic-gate 6957c478bd9Sstevel@tonic-gate /* 6967c478bd9Sstevel@tonic-gate * Acquire the appropriate page hash lock since 6977c478bd9Sstevel@tonic-gate * we have to search the hash list. Pages that 6987c478bd9Sstevel@tonic-gate * hash to this list can't change identity while 6997c478bd9Sstevel@tonic-gate * this lock is held. 7007c478bd9Sstevel@tonic-gate */ 7017c478bd9Sstevel@tonic-gate hash_locked = 0; 7027c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 7037c478bd9Sstevel@tonic-gate phm = NULL; 7047c478bd9Sstevel@tonic-gate top: 7057c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 7067c478bd9Sstevel@tonic-gate if (pp != NULL) { 7077c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[1]); 7087c478bd9Sstevel@tonic-gate es = (newpp != NULL) ? 1 : 0; 7097c478bd9Sstevel@tonic-gate es |= flags; 7107c478bd9Sstevel@tonic-gate if (!hash_locked) { 7117c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[2]); 7127c478bd9Sstevel@tonic-gate if (!page_try_reclaim_lock(pp, se, es)) { 7137c478bd9Sstevel@tonic-gate /* 7147c478bd9Sstevel@tonic-gate * On a miss, acquire the phm. Then 7157c478bd9Sstevel@tonic-gate * next time, page_lock() will be called, 7167c478bd9Sstevel@tonic-gate * causing a wait if the page is busy. 7177c478bd9Sstevel@tonic-gate * just looping with page_trylock() would 7187c478bd9Sstevel@tonic-gate * get pretty boring. 7197c478bd9Sstevel@tonic-gate */ 7207c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[3]); 7217c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 7227c478bd9Sstevel@tonic-gate mutex_enter(phm); 7237c478bd9Sstevel@tonic-gate hash_locked = 1; 7247c478bd9Sstevel@tonic-gate goto top; 7257c478bd9Sstevel@tonic-gate } 7267c478bd9Sstevel@tonic-gate } else { 7277c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[4]); 7287c478bd9Sstevel@tonic-gate if (!page_lock_es(pp, se, phm, P_RECLAIM, es)) { 7297c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[5]); 7307c478bd9Sstevel@tonic-gate goto top; 7317c478bd9Sstevel@tonic-gate } 7327c478bd9Sstevel@tonic-gate } 7337c478bd9Sstevel@tonic-gate 7347c478bd9Sstevel@tonic-gate /* 7357c478bd9Sstevel@tonic-gate * Since `pp' is locked it can not change identity now. 7367c478bd9Sstevel@tonic-gate * Reconfirm we locked the correct page. 7377c478bd9Sstevel@tonic-gate * 7387c478bd9Sstevel@tonic-gate * Both the p_vnode and p_offset *must* be cast volatile 7397c478bd9Sstevel@tonic-gate * to force a reload of their values: The PAGE_HASH_SEARCH 7407c478bd9Sstevel@tonic-gate * macro will have stuffed p_vnode and p_offset into 7417c478bd9Sstevel@tonic-gate * registers before calling page_trylock(); another thread, 7427c478bd9Sstevel@tonic-gate * actually holding the hash lock, could have changed the 7437c478bd9Sstevel@tonic-gate * page's identity in memory, but our registers would not 7447c478bd9Sstevel@tonic-gate * be changed, fooling the reconfirmation. If the hash 7457c478bd9Sstevel@tonic-gate * lock was held during the search, the casting would 7467c478bd9Sstevel@tonic-gate * not be needed. 7477c478bd9Sstevel@tonic-gate */ 7487c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[6]); 7497c478bd9Sstevel@tonic-gate if (((volatile struct vnode *)(pp->p_vnode) != vp) || 7507c478bd9Sstevel@tonic-gate ((volatile u_offset_t)(pp->p_offset) != off)) { 7517c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[7]); 7527c478bd9Sstevel@tonic-gate if (hash_locked) { 7537c478bd9Sstevel@tonic-gate panic("page_lookup_create: lost page %p", 7547c478bd9Sstevel@tonic-gate (void *)pp); 7557c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 7567c478bd9Sstevel@tonic-gate } 7577c478bd9Sstevel@tonic-gate page_unlock(pp); 7587c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 7597c478bd9Sstevel@tonic-gate mutex_enter(phm); 7607c478bd9Sstevel@tonic-gate hash_locked = 1; 7617c478bd9Sstevel@tonic-gate goto top; 7627c478bd9Sstevel@tonic-gate } 7637c478bd9Sstevel@tonic-gate 7647c478bd9Sstevel@tonic-gate /* 7657c478bd9Sstevel@tonic-gate * If page_trylock() was called, then pp may still be on 7667c478bd9Sstevel@tonic-gate * the cachelist (can't be on the free list, it would not 7677c478bd9Sstevel@tonic-gate * have been found in the search). If it is on the 7687c478bd9Sstevel@tonic-gate * cachelist it must be pulled now. To pull the page from 7697c478bd9Sstevel@tonic-gate * the cachelist, it must be exclusively locked. 7707c478bd9Sstevel@tonic-gate * 7717c478bd9Sstevel@tonic-gate * The other big difference between page_trylock() and 7727c478bd9Sstevel@tonic-gate * page_lock(), is that page_lock() will pull the 7737c478bd9Sstevel@tonic-gate * page from whatever free list (the cache list in this 7747c478bd9Sstevel@tonic-gate * case) the page is on. If page_trylock() was used 7757c478bd9Sstevel@tonic-gate * above, then we have to do the reclaim ourselves. 7767c478bd9Sstevel@tonic-gate */ 7777c478bd9Sstevel@tonic-gate if ((!hash_locked) && (PP_ISFREE(pp))) { 7787c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp) == 0); 7797c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[8]); 7807c478bd9Sstevel@tonic-gate 7817c478bd9Sstevel@tonic-gate /* 7827c478bd9Sstevel@tonic-gate * page_relcaim will insure that we 7837c478bd9Sstevel@tonic-gate * have this page exclusively 7847c478bd9Sstevel@tonic-gate */ 7857c478bd9Sstevel@tonic-gate 7867c478bd9Sstevel@tonic-gate if (!page_reclaim(pp, NULL)) { 7877c478bd9Sstevel@tonic-gate /* 7887c478bd9Sstevel@tonic-gate * Page_reclaim dropped whatever lock 7897c478bd9Sstevel@tonic-gate * we held. 7907c478bd9Sstevel@tonic-gate */ 7917c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[9]); 7927c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 7937c478bd9Sstevel@tonic-gate mutex_enter(phm); 7947c478bd9Sstevel@tonic-gate hash_locked = 1; 7957c478bd9Sstevel@tonic-gate goto top; 7967c478bd9Sstevel@tonic-gate } else if (se == SE_SHARED && newpp == NULL) { 7977c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[10]); 7987c478bd9Sstevel@tonic-gate page_downgrade(pp); 7997c478bd9Sstevel@tonic-gate } 8007c478bd9Sstevel@tonic-gate } 8017c478bd9Sstevel@tonic-gate 8027c478bd9Sstevel@tonic-gate if (hash_locked) { 8037c478bd9Sstevel@tonic-gate mutex_exit(phm); 8047c478bd9Sstevel@tonic-gate } 8057c478bd9Sstevel@tonic-gate 8067c478bd9Sstevel@tonic-gate if (newpp != NULL && pp->p_szc < newpp->p_szc && 8077c478bd9Sstevel@tonic-gate PAGE_EXCL(pp) && nrelocp != NULL) { 8087c478bd9Sstevel@tonic-gate ASSERT(nrelocp != NULL); 8097c478bd9Sstevel@tonic-gate (void) page_relocate(&pp, &newpp, 1, 1, nrelocp, 8107c478bd9Sstevel@tonic-gate NULL); 8117c478bd9Sstevel@tonic-gate if (*nrelocp > 0) { 8127c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(*nrelocp == 1, 8137c478bd9Sstevel@tonic-gate page_lookup_cnt[11]); 8147c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(*nrelocp > 1, 8157c478bd9Sstevel@tonic-gate page_lookup_cnt[12]); 8167c478bd9Sstevel@tonic-gate pp = newpp; 8177c478bd9Sstevel@tonic-gate se = SE_EXCL; 8187c478bd9Sstevel@tonic-gate } else { 8197c478bd9Sstevel@tonic-gate if (se == SE_SHARED) { 8207c478bd9Sstevel@tonic-gate page_downgrade(pp); 8217c478bd9Sstevel@tonic-gate } 8227c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[13]); 8237c478bd9Sstevel@tonic-gate } 8247c478bd9Sstevel@tonic-gate } else if (newpp != NULL && nrelocp != NULL) { 8257c478bd9Sstevel@tonic-gate if (PAGE_EXCL(pp) && se == SE_SHARED) { 8267c478bd9Sstevel@tonic-gate page_downgrade(pp); 8277c478bd9Sstevel@tonic-gate } 8287c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(pp->p_szc < newpp->p_szc, 8297c478bd9Sstevel@tonic-gate page_lookup_cnt[14]); 8307c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(pp->p_szc == newpp->p_szc, 8317c478bd9Sstevel@tonic-gate page_lookup_cnt[15]); 8327c478bd9Sstevel@tonic-gate VM_STAT_COND_ADD(pp->p_szc > newpp->p_szc, 8337c478bd9Sstevel@tonic-gate page_lookup_cnt[16]); 8347c478bd9Sstevel@tonic-gate } else if (newpp != NULL && PAGE_EXCL(pp)) { 8357c478bd9Sstevel@tonic-gate se = SE_EXCL; 8367c478bd9Sstevel@tonic-gate } 8377c478bd9Sstevel@tonic-gate } else if (!hash_locked) { 8387c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[17]); 8397c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 8407c478bd9Sstevel@tonic-gate mutex_enter(phm); 8417c478bd9Sstevel@tonic-gate hash_locked = 1; 8427c478bd9Sstevel@tonic-gate goto top; 8437c478bd9Sstevel@tonic-gate } else if (newpp != NULL) { 8447c478bd9Sstevel@tonic-gate /* 8457c478bd9Sstevel@tonic-gate * If we have a preallocated page then 8467c478bd9Sstevel@tonic-gate * insert it now and basically behave like 8477c478bd9Sstevel@tonic-gate * page_create. 8487c478bd9Sstevel@tonic-gate */ 8497c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[18]); 8507c478bd9Sstevel@tonic-gate /* 8517c478bd9Sstevel@tonic-gate * Since we hold the page hash mutex and 8527c478bd9Sstevel@tonic-gate * just searched for this page, page_hashin 8537c478bd9Sstevel@tonic-gate * had better not fail. If it does, that 8547c478bd9Sstevel@tonic-gate * means some thread did not follow the 8557c478bd9Sstevel@tonic-gate * page hash mutex rules. Panic now and 8567c478bd9Sstevel@tonic-gate * get it over with. As usual, go down 8577c478bd9Sstevel@tonic-gate * holding all the locks. 8587c478bd9Sstevel@tonic-gate */ 8597c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 8607c478bd9Sstevel@tonic-gate if (!page_hashin(newpp, vp, off, phm)) { 8617c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 8627c478bd9Sstevel@tonic-gate panic("page_lookup_create: hashin failed %p %p %llx %p", 8637c478bd9Sstevel@tonic-gate (void *)newpp, (void *)vp, off, (void *)phm); 8647c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 8657c478bd9Sstevel@tonic-gate } 8667c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 8677c478bd9Sstevel@tonic-gate mutex_exit(phm); 8687c478bd9Sstevel@tonic-gate phm = NULL; 8697c478bd9Sstevel@tonic-gate page_set_props(newpp, P_REF); 8707c478bd9Sstevel@tonic-gate page_io_lock(newpp); 8717c478bd9Sstevel@tonic-gate pp = newpp; 8727c478bd9Sstevel@tonic-gate se = SE_EXCL; 8737c478bd9Sstevel@tonic-gate } else { 8747c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_cnt[19]); 8757c478bd9Sstevel@tonic-gate mutex_exit(phm); 8767c478bd9Sstevel@tonic-gate } 8777c478bd9Sstevel@tonic-gate 8787c478bd9Sstevel@tonic-gate ASSERT(pp ? PAGE_LOCKED_SE(pp, se) : 1); 8797c478bd9Sstevel@tonic-gate 8807c478bd9Sstevel@tonic-gate ASSERT(pp ? ((PP_ISFREE(pp) == 0) && (PP_ISAGED(pp) == 0)) : 1); 8817c478bd9Sstevel@tonic-gate 8827c478bd9Sstevel@tonic-gate return (pp); 8837c478bd9Sstevel@tonic-gate } 8847c478bd9Sstevel@tonic-gate 8857c478bd9Sstevel@tonic-gate /* 8867c478bd9Sstevel@tonic-gate * Search the hash list for the page representing the 8877c478bd9Sstevel@tonic-gate * specified [vp, offset] and return it locked. Skip 8887c478bd9Sstevel@tonic-gate * free pages and pages that cannot be locked as requested. 8897c478bd9Sstevel@tonic-gate * Used while attempting to kluster pages. 8907c478bd9Sstevel@tonic-gate */ 8917c478bd9Sstevel@tonic-gate page_t * 8927c478bd9Sstevel@tonic-gate page_lookup_nowait(vnode_t *vp, u_offset_t off, se_t se) 8937c478bd9Sstevel@tonic-gate { 8947c478bd9Sstevel@tonic-gate page_t *pp; 8957c478bd9Sstevel@tonic-gate kmutex_t *phm; 8967c478bd9Sstevel@tonic-gate ulong_t index; 8977c478bd9Sstevel@tonic-gate uint_t locked; 8987c478bd9Sstevel@tonic-gate 8997c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 9007c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[0]); 9017c478bd9Sstevel@tonic-gate 9027c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 9037c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 9047c478bd9Sstevel@tonic-gate locked = 0; 9057c478bd9Sstevel@tonic-gate if (pp == NULL) { 9067c478bd9Sstevel@tonic-gate top: 9077c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[1]); 9087c478bd9Sstevel@tonic-gate locked = 1; 9097c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 9107c478bd9Sstevel@tonic-gate mutex_enter(phm); 9117c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 9127c478bd9Sstevel@tonic-gate } 9137c478bd9Sstevel@tonic-gate 9147c478bd9Sstevel@tonic-gate if (pp == NULL || PP_ISFREE(pp)) { 9157c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[2]); 9167c478bd9Sstevel@tonic-gate pp = NULL; 9177c478bd9Sstevel@tonic-gate } else { 9187c478bd9Sstevel@tonic-gate if (!page_trylock(pp, se)) { 9197c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[3]); 9207c478bd9Sstevel@tonic-gate pp = NULL; 9217c478bd9Sstevel@tonic-gate } else { 9227c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[4]); 9237c478bd9Sstevel@tonic-gate /* 9247c478bd9Sstevel@tonic-gate * See the comment in page_lookup() 9257c478bd9Sstevel@tonic-gate */ 9267c478bd9Sstevel@tonic-gate if (((volatile struct vnode *)(pp->p_vnode) != vp) || 9277c478bd9Sstevel@tonic-gate ((u_offset_t)(pp->p_offset) != off)) { 9287c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[5]); 9297c478bd9Sstevel@tonic-gate if (locked) { 9307c478bd9Sstevel@tonic-gate panic("page_lookup_nowait %p", 9317c478bd9Sstevel@tonic-gate (void *)pp); 9327c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 9337c478bd9Sstevel@tonic-gate } 9347c478bd9Sstevel@tonic-gate page_unlock(pp); 9357c478bd9Sstevel@tonic-gate goto top; 9367c478bd9Sstevel@tonic-gate } 9377c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 9387c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[6]); 9397c478bd9Sstevel@tonic-gate page_unlock(pp); 9407c478bd9Sstevel@tonic-gate pp = NULL; 9417c478bd9Sstevel@tonic-gate } 9427c478bd9Sstevel@tonic-gate } 9437c478bd9Sstevel@tonic-gate } 9447c478bd9Sstevel@tonic-gate if (locked) { 9457c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_lookup_nowait_cnt[7]); 9467c478bd9Sstevel@tonic-gate mutex_exit(phm); 9477c478bd9Sstevel@tonic-gate } 9487c478bd9Sstevel@tonic-gate 9497c478bd9Sstevel@tonic-gate ASSERT(pp ? PAGE_LOCKED_SE(pp, se) : 1); 9507c478bd9Sstevel@tonic-gate 9517c478bd9Sstevel@tonic-gate return (pp); 9527c478bd9Sstevel@tonic-gate } 9537c478bd9Sstevel@tonic-gate 9547c478bd9Sstevel@tonic-gate /* 9557c478bd9Sstevel@tonic-gate * Search the hash list for a page with the specified [vp, off] 9567c478bd9Sstevel@tonic-gate * that is known to exist and is already locked. This routine 9577c478bd9Sstevel@tonic-gate * is typically used by segment SOFTUNLOCK routines. 9587c478bd9Sstevel@tonic-gate */ 9597c478bd9Sstevel@tonic-gate page_t * 9607c478bd9Sstevel@tonic-gate page_find(vnode_t *vp, u_offset_t off) 9617c478bd9Sstevel@tonic-gate { 9627c478bd9Sstevel@tonic-gate page_t *pp; 9637c478bd9Sstevel@tonic-gate kmutex_t *phm; 9647c478bd9Sstevel@tonic-gate ulong_t index; 9657c478bd9Sstevel@tonic-gate 9667c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 9677c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_find_cnt); 9687c478bd9Sstevel@tonic-gate 9697c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 9707c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 9717c478bd9Sstevel@tonic-gate 9727c478bd9Sstevel@tonic-gate mutex_enter(phm); 9737c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 9747c478bd9Sstevel@tonic-gate mutex_exit(phm); 9757c478bd9Sstevel@tonic-gate 9764fc2445aSelowe ASSERT(pp == NULL || PAGE_LOCKED(pp) || panicstr); 9777c478bd9Sstevel@tonic-gate return (pp); 9787c478bd9Sstevel@tonic-gate } 9797c478bd9Sstevel@tonic-gate 9807c478bd9Sstevel@tonic-gate /* 9817c478bd9Sstevel@tonic-gate * Determine whether a page with the specified [vp, off] 9827c478bd9Sstevel@tonic-gate * currently exists in the system. Obviously this should 9837c478bd9Sstevel@tonic-gate * only be considered as a hint since nothing prevents the 9847c478bd9Sstevel@tonic-gate * page from disappearing or appearing immediately after 9857c478bd9Sstevel@tonic-gate * the return from this routine. Subsequently, we don't 9867c478bd9Sstevel@tonic-gate * even bother to lock the list. 9877c478bd9Sstevel@tonic-gate */ 9887c478bd9Sstevel@tonic-gate page_t * 9897c478bd9Sstevel@tonic-gate page_exists(vnode_t *vp, u_offset_t off) 9907c478bd9Sstevel@tonic-gate { 9917c478bd9Sstevel@tonic-gate page_t *pp; 9927c478bd9Sstevel@tonic-gate ulong_t index; 9937c478bd9Sstevel@tonic-gate 9947c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 9957c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exists_cnt); 9967c478bd9Sstevel@tonic-gate 9977c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 9987c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 9997c478bd9Sstevel@tonic-gate 10007c478bd9Sstevel@tonic-gate return (pp); 10017c478bd9Sstevel@tonic-gate } 10027c478bd9Sstevel@tonic-gate 10037c478bd9Sstevel@tonic-gate /* 10047c478bd9Sstevel@tonic-gate * Determine if physically contiguous pages exist for [vp, off] - [vp, off + 10057c478bd9Sstevel@tonic-gate * page_size(szc)) range. if they exist and ppa is not NULL fill ppa array 10067c478bd9Sstevel@tonic-gate * with these pages locked SHARED. If necessary reclaim pages from 10077c478bd9Sstevel@tonic-gate * freelist. Return 1 if contiguous pages exist and 0 otherwise. 10087c478bd9Sstevel@tonic-gate * 10097c478bd9Sstevel@tonic-gate * If we fail to lock pages still return 1 if pages exist and contiguous. 10107c478bd9Sstevel@tonic-gate * But in this case return value is just a hint. ppa array won't be filled. 10117c478bd9Sstevel@tonic-gate * Caller should initialize ppa[0] as NULL to distinguish return value. 10127c478bd9Sstevel@tonic-gate * 10137c478bd9Sstevel@tonic-gate * Returns 0 if pages don't exist or not physically contiguous. 10147c478bd9Sstevel@tonic-gate * 10157c478bd9Sstevel@tonic-gate * This routine doesn't work for anonymous(swapfs) pages. 10167c478bd9Sstevel@tonic-gate */ 10177c478bd9Sstevel@tonic-gate int 10187c478bd9Sstevel@tonic-gate page_exists_physcontig(vnode_t *vp, u_offset_t off, uint_t szc, page_t *ppa[]) 10197c478bd9Sstevel@tonic-gate { 10207c478bd9Sstevel@tonic-gate pgcnt_t pages; 10217c478bd9Sstevel@tonic-gate pfn_t pfn; 10227c478bd9Sstevel@tonic-gate page_t *rootpp; 10237c478bd9Sstevel@tonic-gate pgcnt_t i; 10247c478bd9Sstevel@tonic-gate pgcnt_t j; 10257c478bd9Sstevel@tonic-gate u_offset_t save_off = off; 10267c478bd9Sstevel@tonic-gate ulong_t index; 10277c478bd9Sstevel@tonic-gate kmutex_t *phm; 10287c478bd9Sstevel@tonic-gate page_t *pp; 10297c478bd9Sstevel@tonic-gate uint_t pszc; 10307c478bd9Sstevel@tonic-gate int loopcnt = 0; 10317c478bd9Sstevel@tonic-gate 10327c478bd9Sstevel@tonic-gate ASSERT(szc != 0); 10337c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 10347c478bd9Sstevel@tonic-gate ASSERT(!IS_SWAPFSVP(vp)); 10357c478bd9Sstevel@tonic-gate ASSERT(vp != &kvp); 10367c478bd9Sstevel@tonic-gate 10377c478bd9Sstevel@tonic-gate again: 10387c478bd9Sstevel@tonic-gate if (++loopcnt > 3) { 10397c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[0]); 10407c478bd9Sstevel@tonic-gate return (0); 10417c478bd9Sstevel@tonic-gate } 10427c478bd9Sstevel@tonic-gate 10437c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 10447c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 10457c478bd9Sstevel@tonic-gate 10467c478bd9Sstevel@tonic-gate mutex_enter(phm); 10477c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 10487c478bd9Sstevel@tonic-gate mutex_exit(phm); 10497c478bd9Sstevel@tonic-gate 10507c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[1]); 10517c478bd9Sstevel@tonic-gate 10527c478bd9Sstevel@tonic-gate if (pp == NULL) { 10537c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[2]); 10547c478bd9Sstevel@tonic-gate return (0); 10557c478bd9Sstevel@tonic-gate } 10567c478bd9Sstevel@tonic-gate 10577c478bd9Sstevel@tonic-gate pages = page_get_pagecnt(szc); 10587c478bd9Sstevel@tonic-gate rootpp = pp; 10597c478bd9Sstevel@tonic-gate pfn = rootpp->p_pagenum; 10607c478bd9Sstevel@tonic-gate 10617c478bd9Sstevel@tonic-gate if ((pszc = pp->p_szc) >= szc && ppa != NULL) { 10627c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[3]); 10637c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_SHARED)) { 10647c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[4]); 10657c478bd9Sstevel@tonic-gate return (1); 10667c478bd9Sstevel@tonic-gate } 10677c478bd9Sstevel@tonic-gate if (pp->p_szc != pszc || pp->p_vnode != vp || 10687c478bd9Sstevel@tonic-gate pp->p_offset != off) { 10697c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[5]); 10707c478bd9Sstevel@tonic-gate page_unlock(pp); 10717c478bd9Sstevel@tonic-gate off = save_off; 10727c478bd9Sstevel@tonic-gate goto again; 10737c478bd9Sstevel@tonic-gate } 10747c478bd9Sstevel@tonic-gate /* 10757c478bd9Sstevel@tonic-gate * szc was non zero and vnode and offset matched after we 10767c478bd9Sstevel@tonic-gate * locked the page it means it can't become free on us. 10777c478bd9Sstevel@tonic-gate */ 10787c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 10797c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, pages)) { 10807c478bd9Sstevel@tonic-gate page_unlock(pp); 10817c478bd9Sstevel@tonic-gate return (0); 10827c478bd9Sstevel@tonic-gate } 10837c478bd9Sstevel@tonic-gate ppa[0] = pp; 10847c478bd9Sstevel@tonic-gate pp++; 10857c478bd9Sstevel@tonic-gate off += PAGESIZE; 10867c478bd9Sstevel@tonic-gate pfn++; 10877c478bd9Sstevel@tonic-gate for (i = 1; i < pages; i++, pp++, off += PAGESIZE, pfn++) { 10887c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_SHARED)) { 10897c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[6]); 10907c478bd9Sstevel@tonic-gate pp--; 10917c478bd9Sstevel@tonic-gate while (i-- > 0) { 10927c478bd9Sstevel@tonic-gate page_unlock(pp); 10937c478bd9Sstevel@tonic-gate pp--; 10947c478bd9Sstevel@tonic-gate } 10957c478bd9Sstevel@tonic-gate ppa[0] = NULL; 10967c478bd9Sstevel@tonic-gate return (1); 10977c478bd9Sstevel@tonic-gate } 10987c478bd9Sstevel@tonic-gate if (pp->p_szc != pszc) { 10997c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[7]); 11007c478bd9Sstevel@tonic-gate page_unlock(pp); 11017c478bd9Sstevel@tonic-gate pp--; 11027c478bd9Sstevel@tonic-gate while (i-- > 0) { 11037c478bd9Sstevel@tonic-gate page_unlock(pp); 11047c478bd9Sstevel@tonic-gate pp--; 11057c478bd9Sstevel@tonic-gate } 11067c478bd9Sstevel@tonic-gate ppa[0] = NULL; 11077c478bd9Sstevel@tonic-gate off = save_off; 11087c478bd9Sstevel@tonic-gate goto again; 11097c478bd9Sstevel@tonic-gate } 11107c478bd9Sstevel@tonic-gate /* 11117c478bd9Sstevel@tonic-gate * szc the same as for previous already locked pages 11127c478bd9Sstevel@tonic-gate * with right identity. Since this page had correct 11137c478bd9Sstevel@tonic-gate * szc after we locked it can't get freed or destroyed 11147c478bd9Sstevel@tonic-gate * and therefore must have the expected identity. 11157c478bd9Sstevel@tonic-gate */ 11167c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 11177c478bd9Sstevel@tonic-gate if (pp->p_vnode != vp || 11187c478bd9Sstevel@tonic-gate pp->p_offset != off) { 11197c478bd9Sstevel@tonic-gate panic("page_exists_physcontig: " 11207c478bd9Sstevel@tonic-gate "large page identity doesn't match"); 11217c478bd9Sstevel@tonic-gate } 11227c478bd9Sstevel@tonic-gate ppa[i] = pp; 11237c478bd9Sstevel@tonic-gate ASSERT(pp->p_pagenum == pfn); 11247c478bd9Sstevel@tonic-gate } 11257c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[8]); 11267c478bd9Sstevel@tonic-gate ppa[pages] = NULL; 11277c478bd9Sstevel@tonic-gate return (1); 11287c478bd9Sstevel@tonic-gate } else if (pszc >= szc) { 11297c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[9]); 11307c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, pages)) { 11317c478bd9Sstevel@tonic-gate return (0); 11327c478bd9Sstevel@tonic-gate } 11337c478bd9Sstevel@tonic-gate return (1); 11347c478bd9Sstevel@tonic-gate } 11357c478bd9Sstevel@tonic-gate 11367c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, pages)) { 11377c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[10]); 11387c478bd9Sstevel@tonic-gate return (0); 11397c478bd9Sstevel@tonic-gate } 11407c478bd9Sstevel@tonic-gate 11417c478bd9Sstevel@tonic-gate if (page_numtomemseg_nolock(pfn) != 11427c478bd9Sstevel@tonic-gate page_numtomemseg_nolock(pfn + pages - 1)) { 11437c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[11]); 11447c478bd9Sstevel@tonic-gate return (0); 11457c478bd9Sstevel@tonic-gate } 11467c478bd9Sstevel@tonic-gate 11477c478bd9Sstevel@tonic-gate /* 11487c478bd9Sstevel@tonic-gate * We loop up 4 times across pages to promote page size. 11497c478bd9Sstevel@tonic-gate * We're extra cautious to promote page size atomically with respect 11507c478bd9Sstevel@tonic-gate * to everybody else. But we can probably optimize into 1 loop if 11517c478bd9Sstevel@tonic-gate * this becomes an issue. 11527c478bd9Sstevel@tonic-gate */ 11537c478bd9Sstevel@tonic-gate 11547c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++, off += PAGESIZE, pfn++) { 11557c478bd9Sstevel@tonic-gate ASSERT(pp->p_pagenum == pfn); 11567c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) { 11577c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[12]); 11587c478bd9Sstevel@tonic-gate break; 11597c478bd9Sstevel@tonic-gate } 11607c478bd9Sstevel@tonic-gate if (pp->p_vnode != vp || 11617c478bd9Sstevel@tonic-gate pp->p_offset != off) { 11627c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[13]); 11637c478bd9Sstevel@tonic-gate page_unlock(pp); 11647c478bd9Sstevel@tonic-gate break; 11657c478bd9Sstevel@tonic-gate } 11667c478bd9Sstevel@tonic-gate if (pp->p_szc >= szc) { 11677c478bd9Sstevel@tonic-gate ASSERT(i == 0); 11687c478bd9Sstevel@tonic-gate page_unlock(pp); 11697c478bd9Sstevel@tonic-gate off = save_off; 11707c478bd9Sstevel@tonic-gate goto again; 11717c478bd9Sstevel@tonic-gate } 11727c478bd9Sstevel@tonic-gate } 11737c478bd9Sstevel@tonic-gate 11747c478bd9Sstevel@tonic-gate if (i != pages) { 11757c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[14]); 11767c478bd9Sstevel@tonic-gate --pp; 11777c478bd9Sstevel@tonic-gate while (i-- > 0) { 11787c478bd9Sstevel@tonic-gate page_unlock(pp); 11797c478bd9Sstevel@tonic-gate --pp; 11807c478bd9Sstevel@tonic-gate } 11817c478bd9Sstevel@tonic-gate return (0); 11827c478bd9Sstevel@tonic-gate } 11837c478bd9Sstevel@tonic-gate 11847c478bd9Sstevel@tonic-gate pp = rootpp; 11857c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++) { 11867c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 11877c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[15]); 11887c478bd9Sstevel@tonic-gate ASSERT(!PP_ISAGED(pp)); 11897c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 11907c478bd9Sstevel@tonic-gate if (!page_reclaim(pp, NULL)) { 11917c478bd9Sstevel@tonic-gate break; 11927c478bd9Sstevel@tonic-gate } 11937c478bd9Sstevel@tonic-gate } else { 11947c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc < szc); 11957c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[16]); 11967c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 11977c478bd9Sstevel@tonic-gate } 11987c478bd9Sstevel@tonic-gate } 11997c478bd9Sstevel@tonic-gate if (i < pages) { 12007c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[17]); 12017c478bd9Sstevel@tonic-gate /* 12027c478bd9Sstevel@tonic-gate * page_reclaim failed because we were out of memory. 12037c478bd9Sstevel@tonic-gate * drop the rest of the locks and return because this page 12047c478bd9Sstevel@tonic-gate * must be already reallocated anyway. 12057c478bd9Sstevel@tonic-gate */ 12067c478bd9Sstevel@tonic-gate pp = rootpp; 12077c478bd9Sstevel@tonic-gate for (j = 0; j < pages; j++, pp++) { 12087c478bd9Sstevel@tonic-gate if (j != i) { 12097c478bd9Sstevel@tonic-gate page_unlock(pp); 12107c478bd9Sstevel@tonic-gate } 12117c478bd9Sstevel@tonic-gate } 12127c478bd9Sstevel@tonic-gate return (0); 12137c478bd9Sstevel@tonic-gate } 12147c478bd9Sstevel@tonic-gate 12157c478bd9Sstevel@tonic-gate off = save_off; 12167c478bd9Sstevel@tonic-gate pp = rootpp; 12177c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++, off += PAGESIZE) { 12187c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 12197c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 12207c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 12217c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == vp); 12227c478bd9Sstevel@tonic-gate ASSERT(pp->p_offset == off); 12237c478bd9Sstevel@tonic-gate pp->p_szc = szc; 12247c478bd9Sstevel@tonic-gate } 12257c478bd9Sstevel@tonic-gate pp = rootpp; 12267c478bd9Sstevel@tonic-gate for (i = 0; i < pages; i++, pp++) { 12277c478bd9Sstevel@tonic-gate if (ppa == NULL) { 12287c478bd9Sstevel@tonic-gate page_unlock(pp); 12297c478bd9Sstevel@tonic-gate } else { 12307c478bd9Sstevel@tonic-gate ppa[i] = pp; 12317c478bd9Sstevel@tonic-gate page_downgrade(ppa[i]); 12327c478bd9Sstevel@tonic-gate } 12337c478bd9Sstevel@tonic-gate } 12347c478bd9Sstevel@tonic-gate if (ppa != NULL) { 12357c478bd9Sstevel@tonic-gate ppa[pages] = NULL; 12367c478bd9Sstevel@tonic-gate } 12377c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exphcontg[18]); 12387c478bd9Sstevel@tonic-gate ASSERT(vp->v_pages != NULL); 12397c478bd9Sstevel@tonic-gate return (1); 12407c478bd9Sstevel@tonic-gate } 12417c478bd9Sstevel@tonic-gate 12427c478bd9Sstevel@tonic-gate /* 12437c478bd9Sstevel@tonic-gate * Determine whether a page with the specified [vp, off] 12447c478bd9Sstevel@tonic-gate * currently exists in the system and if so return its 12457c478bd9Sstevel@tonic-gate * size code. Obviously this should only be considered as 12467c478bd9Sstevel@tonic-gate * a hint since nothing prevents the page from disappearing 12477c478bd9Sstevel@tonic-gate * or appearing immediately after the return from this routine. 12487c478bd9Sstevel@tonic-gate */ 12497c478bd9Sstevel@tonic-gate int 12507c478bd9Sstevel@tonic-gate page_exists_forreal(vnode_t *vp, u_offset_t off, uint_t *szc) 12517c478bd9Sstevel@tonic-gate { 12527c478bd9Sstevel@tonic-gate page_t *pp; 12537c478bd9Sstevel@tonic-gate kmutex_t *phm; 12547c478bd9Sstevel@tonic-gate ulong_t index; 12557c478bd9Sstevel@tonic-gate int rc = 0; 12567c478bd9Sstevel@tonic-gate 12577c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 12587c478bd9Sstevel@tonic-gate ASSERT(szc != NULL); 12597c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_exists_forreal_cnt); 12607c478bd9Sstevel@tonic-gate 12617c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 12627c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 12637c478bd9Sstevel@tonic-gate 12647c478bd9Sstevel@tonic-gate mutex_enter(phm); 12657c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 12667c478bd9Sstevel@tonic-gate if (pp != NULL) { 12677c478bd9Sstevel@tonic-gate *szc = pp->p_szc; 12687c478bd9Sstevel@tonic-gate rc = 1; 12697c478bd9Sstevel@tonic-gate } 12707c478bd9Sstevel@tonic-gate mutex_exit(phm); 12717c478bd9Sstevel@tonic-gate return (rc); 12727c478bd9Sstevel@tonic-gate } 12737c478bd9Sstevel@tonic-gate 12747c478bd9Sstevel@tonic-gate /* wakeup threads waiting for pages in page_create_get_something() */ 12757c478bd9Sstevel@tonic-gate void 12767c478bd9Sstevel@tonic-gate wakeup_pcgs(void) 12777c478bd9Sstevel@tonic-gate { 12787c478bd9Sstevel@tonic-gate if (!CV_HAS_WAITERS(&pcgs_cv)) 12797c478bd9Sstevel@tonic-gate return; 12807c478bd9Sstevel@tonic-gate cv_broadcast(&pcgs_cv); 12817c478bd9Sstevel@tonic-gate } 12827c478bd9Sstevel@tonic-gate 12837c478bd9Sstevel@tonic-gate /* 12847c478bd9Sstevel@tonic-gate * 'freemem' is used all over the kernel as an indication of how many 12857c478bd9Sstevel@tonic-gate * pages are free (either on the cache list or on the free page list) 12867c478bd9Sstevel@tonic-gate * in the system. In very few places is a really accurate 'freemem' 12877c478bd9Sstevel@tonic-gate * needed. To avoid contention of the lock protecting a the 12887c478bd9Sstevel@tonic-gate * single freemem, it was spread out into NCPU buckets. Set_freemem 12897c478bd9Sstevel@tonic-gate * sets freemem to the total of all NCPU buckets. It is called from 12907c478bd9Sstevel@tonic-gate * clock() on each TICK. 12917c478bd9Sstevel@tonic-gate */ 12927c478bd9Sstevel@tonic-gate void 12937c478bd9Sstevel@tonic-gate set_freemem() 12947c478bd9Sstevel@tonic-gate { 12957c478bd9Sstevel@tonic-gate struct pcf *p; 12967c478bd9Sstevel@tonic-gate ulong_t t; 12977c478bd9Sstevel@tonic-gate uint_t i; 12987c478bd9Sstevel@tonic-gate 12997c478bd9Sstevel@tonic-gate t = 0; 13007c478bd9Sstevel@tonic-gate p = pcf; 13017c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 13027c478bd9Sstevel@tonic-gate t += p->pcf_count; 13037c478bd9Sstevel@tonic-gate p++; 13047c478bd9Sstevel@tonic-gate } 13057c478bd9Sstevel@tonic-gate freemem = t; 13067c478bd9Sstevel@tonic-gate 13077c478bd9Sstevel@tonic-gate /* 13087c478bd9Sstevel@tonic-gate * Don't worry about grabbing mutex. It's not that 13097c478bd9Sstevel@tonic-gate * critical if we miss a tick or two. This is 13107c478bd9Sstevel@tonic-gate * where we wakeup possible delayers in 13117c478bd9Sstevel@tonic-gate * page_create_get_something(). 13127c478bd9Sstevel@tonic-gate */ 13137c478bd9Sstevel@tonic-gate wakeup_pcgs(); 13147c478bd9Sstevel@tonic-gate } 13157c478bd9Sstevel@tonic-gate 13167c478bd9Sstevel@tonic-gate ulong_t 13177c478bd9Sstevel@tonic-gate get_freemem() 13187c478bd9Sstevel@tonic-gate { 13197c478bd9Sstevel@tonic-gate struct pcf *p; 13207c478bd9Sstevel@tonic-gate ulong_t t; 13217c478bd9Sstevel@tonic-gate uint_t i; 13227c478bd9Sstevel@tonic-gate 13237c478bd9Sstevel@tonic-gate t = 0; 13247c478bd9Sstevel@tonic-gate p = pcf; 13257c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 13267c478bd9Sstevel@tonic-gate t += p->pcf_count; 13277c478bd9Sstevel@tonic-gate p++; 13287c478bd9Sstevel@tonic-gate } 13297c478bd9Sstevel@tonic-gate /* 13307c478bd9Sstevel@tonic-gate * We just calculated it, might as well set it. 13317c478bd9Sstevel@tonic-gate */ 13327c478bd9Sstevel@tonic-gate freemem = t; 13337c478bd9Sstevel@tonic-gate return (t); 13347c478bd9Sstevel@tonic-gate } 13357c478bd9Sstevel@tonic-gate 13367c478bd9Sstevel@tonic-gate /* 13377c478bd9Sstevel@tonic-gate * Acquire all of the page cache & free (pcf) locks. 13387c478bd9Sstevel@tonic-gate */ 13397c478bd9Sstevel@tonic-gate void 13407c478bd9Sstevel@tonic-gate pcf_acquire_all() 13417c478bd9Sstevel@tonic-gate { 13427c478bd9Sstevel@tonic-gate struct pcf *p; 13437c478bd9Sstevel@tonic-gate uint_t i; 13447c478bd9Sstevel@tonic-gate 13457c478bd9Sstevel@tonic-gate p = pcf; 13467c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 13477c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 13487c478bd9Sstevel@tonic-gate p++; 13497c478bd9Sstevel@tonic-gate } 13507c478bd9Sstevel@tonic-gate } 13517c478bd9Sstevel@tonic-gate 13527c478bd9Sstevel@tonic-gate /* 13537c478bd9Sstevel@tonic-gate * Release all the pcf_locks. 13547c478bd9Sstevel@tonic-gate */ 13557c478bd9Sstevel@tonic-gate void 13567c478bd9Sstevel@tonic-gate pcf_release_all() 13577c478bd9Sstevel@tonic-gate { 13587c478bd9Sstevel@tonic-gate struct pcf *p; 13597c478bd9Sstevel@tonic-gate uint_t i; 13607c478bd9Sstevel@tonic-gate 13617c478bd9Sstevel@tonic-gate p = pcf; 13627c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 13637c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 13647c478bd9Sstevel@tonic-gate p++; 13657c478bd9Sstevel@tonic-gate } 13667c478bd9Sstevel@tonic-gate } 13677c478bd9Sstevel@tonic-gate 13687c478bd9Sstevel@tonic-gate /* 13697c478bd9Sstevel@tonic-gate * Inform the VM system that we need some pages freed up. 13707c478bd9Sstevel@tonic-gate * Calls must be symmetric, e.g.: 13717c478bd9Sstevel@tonic-gate * 13727c478bd9Sstevel@tonic-gate * page_needfree(100); 13737c478bd9Sstevel@tonic-gate * wait a bit; 13747c478bd9Sstevel@tonic-gate * page_needfree(-100); 13757c478bd9Sstevel@tonic-gate */ 13767c478bd9Sstevel@tonic-gate void 13777c478bd9Sstevel@tonic-gate page_needfree(spgcnt_t npages) 13787c478bd9Sstevel@tonic-gate { 13797c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 13807c478bd9Sstevel@tonic-gate needfree += npages; 13817c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 13827c478bd9Sstevel@tonic-gate } 13837c478bd9Sstevel@tonic-gate 13847c478bd9Sstevel@tonic-gate /* 13857c478bd9Sstevel@tonic-gate * Throttle for page_create(): try to prevent freemem from dropping 13867c478bd9Sstevel@tonic-gate * below throttlefree. We can't provide a 100% guarantee because 13877c478bd9Sstevel@tonic-gate * KM_NOSLEEP allocations, page_reclaim(), and various other things 13887c478bd9Sstevel@tonic-gate * nibble away at the freelist. However, we can block all PG_WAIT 13897c478bd9Sstevel@tonic-gate * allocations until memory becomes available. The motivation is 13907c478bd9Sstevel@tonic-gate * that several things can fall apart when there's no free memory: 13917c478bd9Sstevel@tonic-gate * 13927c478bd9Sstevel@tonic-gate * (1) If pageout() needs memory to push a page, the system deadlocks. 13937c478bd9Sstevel@tonic-gate * 13947c478bd9Sstevel@tonic-gate * (2) By (broken) specification, timeout(9F) can neither fail nor 13957c478bd9Sstevel@tonic-gate * block, so it has no choice but to panic the system if it 13967c478bd9Sstevel@tonic-gate * cannot allocate a callout structure. 13977c478bd9Sstevel@tonic-gate * 13987c478bd9Sstevel@tonic-gate * (3) Like timeout(), ddi_set_callback() cannot fail and cannot block; 13997c478bd9Sstevel@tonic-gate * it panics if it cannot allocate a callback structure. 14007c478bd9Sstevel@tonic-gate * 14017c478bd9Sstevel@tonic-gate * (4) Untold numbers of third-party drivers have not yet been hardened 14027c478bd9Sstevel@tonic-gate * against KM_NOSLEEP and/or allocb() failures; they simply assume 14037c478bd9Sstevel@tonic-gate * success and panic the system with a data fault on failure. 14047c478bd9Sstevel@tonic-gate * (The long-term solution to this particular problem is to ship 14057c478bd9Sstevel@tonic-gate * hostile fault-injecting DEBUG kernels with the DDK.) 14067c478bd9Sstevel@tonic-gate * 14077c478bd9Sstevel@tonic-gate * It is theoretically impossible to guarantee success of non-blocking 14087c478bd9Sstevel@tonic-gate * allocations, but in practice, this throttle is very hard to break. 14097c478bd9Sstevel@tonic-gate */ 14107c478bd9Sstevel@tonic-gate static int 14117c478bd9Sstevel@tonic-gate page_create_throttle(pgcnt_t npages, int flags) 14127c478bd9Sstevel@tonic-gate { 14137c478bd9Sstevel@tonic-gate ulong_t fm; 14147c478bd9Sstevel@tonic-gate uint_t i; 14157c478bd9Sstevel@tonic-gate pgcnt_t tf; /* effective value of throttlefree */ 14167c478bd9Sstevel@tonic-gate 14177c478bd9Sstevel@tonic-gate /* 14187c478bd9Sstevel@tonic-gate * Never deny pages when: 14197c478bd9Sstevel@tonic-gate * - it's a thread that cannot block [NOMEMWAIT()] 14207c478bd9Sstevel@tonic-gate * - the allocation cannot block and must not fail 14217c478bd9Sstevel@tonic-gate * - the allocation cannot block and is pageout dispensated 14227c478bd9Sstevel@tonic-gate */ 14237c478bd9Sstevel@tonic-gate if (NOMEMWAIT() || 14247c478bd9Sstevel@tonic-gate ((flags & (PG_WAIT | PG_PANIC)) == PG_PANIC) || 14257c478bd9Sstevel@tonic-gate ((flags & (PG_WAIT | PG_PUSHPAGE)) == PG_PUSHPAGE)) 14267c478bd9Sstevel@tonic-gate return (1); 14277c478bd9Sstevel@tonic-gate 14287c478bd9Sstevel@tonic-gate /* 14297c478bd9Sstevel@tonic-gate * If the allocation can't block, we look favorably upon it 14307c478bd9Sstevel@tonic-gate * unless we're below pageout_reserve. In that case we fail 14317c478bd9Sstevel@tonic-gate * the allocation because we want to make sure there are a few 14327c478bd9Sstevel@tonic-gate * pages available for pageout. 14337c478bd9Sstevel@tonic-gate */ 14347c478bd9Sstevel@tonic-gate if ((flags & PG_WAIT) == 0) 14357c478bd9Sstevel@tonic-gate return (freemem >= npages + pageout_reserve); 14367c478bd9Sstevel@tonic-gate 14377c478bd9Sstevel@tonic-gate /* Calculate the effective throttlefree value */ 14387c478bd9Sstevel@tonic-gate tf = throttlefree - 14397c478bd9Sstevel@tonic-gate ((flags & PG_PUSHPAGE) ? pageout_reserve : 0); 14407c478bd9Sstevel@tonic-gate 14417c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 14427c478bd9Sstevel@tonic-gate 14437c478bd9Sstevel@tonic-gate while (freemem < npages + tf) { 14447c478bd9Sstevel@tonic-gate pcf_acquire_all(); 14457c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 14467c478bd9Sstevel@tonic-gate fm = 0; 14477c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 14487c478bd9Sstevel@tonic-gate fm += pcf[i].pcf_count; 14497c478bd9Sstevel@tonic-gate pcf[i].pcf_wait++; 14507c478bd9Sstevel@tonic-gate mutex_exit(&pcf[i].pcf_lock); 14517c478bd9Sstevel@tonic-gate } 14527c478bd9Sstevel@tonic-gate freemem = fm; 14537c478bd9Sstevel@tonic-gate needfree += npages; 14547c478bd9Sstevel@tonic-gate freemem_wait++; 14557c478bd9Sstevel@tonic-gate cv_wait(&freemem_cv, &new_freemem_lock); 14567c478bd9Sstevel@tonic-gate freemem_wait--; 14577c478bd9Sstevel@tonic-gate needfree -= npages; 14587c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 14597c478bd9Sstevel@tonic-gate } 14607c478bd9Sstevel@tonic-gate return (1); 14617c478bd9Sstevel@tonic-gate } 14627c478bd9Sstevel@tonic-gate 14637c478bd9Sstevel@tonic-gate /* 14647c478bd9Sstevel@tonic-gate * page_create_wait() is called to either coalecse pages from the 14657c478bd9Sstevel@tonic-gate * different pcf buckets or to wait because there simply are not 14667c478bd9Sstevel@tonic-gate * enough pages to satisfy the caller's request. 14677c478bd9Sstevel@tonic-gate * 14687c478bd9Sstevel@tonic-gate * Sadly, this is called from platform/vm/vm_machdep.c 14697c478bd9Sstevel@tonic-gate */ 14707c478bd9Sstevel@tonic-gate int 14717c478bd9Sstevel@tonic-gate page_create_wait(size_t npages, uint_t flags) 14727c478bd9Sstevel@tonic-gate { 14737c478bd9Sstevel@tonic-gate pgcnt_t total; 14747c478bd9Sstevel@tonic-gate uint_t i; 14757c478bd9Sstevel@tonic-gate struct pcf *p; 14767c478bd9Sstevel@tonic-gate 14777c478bd9Sstevel@tonic-gate /* 14787c478bd9Sstevel@tonic-gate * Wait until there are enough free pages to satisfy our 14797c478bd9Sstevel@tonic-gate * entire request. 14807c478bd9Sstevel@tonic-gate * We set needfree += npages before prodding pageout, to make sure 14817c478bd9Sstevel@tonic-gate * it does real work when npages > lotsfree > freemem. 14827c478bd9Sstevel@tonic-gate */ 14837c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_not_enough); 14847c478bd9Sstevel@tonic-gate 14857c478bd9Sstevel@tonic-gate ASSERT(!kcage_on ? !(flags & PG_NORELOC) : 1); 14867c478bd9Sstevel@tonic-gate checkagain: 14877c478bd9Sstevel@tonic-gate if ((flags & PG_NORELOC) && 14887c478bd9Sstevel@tonic-gate kcage_freemem < kcage_throttlefree + npages) 14897c478bd9Sstevel@tonic-gate (void) kcage_create_throttle(npages, flags); 14907c478bd9Sstevel@tonic-gate 14917c478bd9Sstevel@tonic-gate if (freemem < npages + throttlefree) 14927c478bd9Sstevel@tonic-gate if (!page_create_throttle(npages, flags)) 14937c478bd9Sstevel@tonic-gate return (0); 14947c478bd9Sstevel@tonic-gate 14957c478bd9Sstevel@tonic-gate /* 14967c478bd9Sstevel@tonic-gate * Since page_create_va() looked at every 14977c478bd9Sstevel@tonic-gate * bucket, assume we are going to have to wait. 14987c478bd9Sstevel@tonic-gate * Get all of the pcf locks. 14997c478bd9Sstevel@tonic-gate */ 15007c478bd9Sstevel@tonic-gate total = 0; 15017c478bd9Sstevel@tonic-gate p = pcf; 15027c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 15037c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 15047c478bd9Sstevel@tonic-gate total += p->pcf_count; 15057c478bd9Sstevel@tonic-gate if (total >= npages) { 15067c478bd9Sstevel@tonic-gate /* 15077c478bd9Sstevel@tonic-gate * Wow! There are enough pages laying around 15087c478bd9Sstevel@tonic-gate * to satisfy the request. Do the accounting, 15097c478bd9Sstevel@tonic-gate * drop the locks we acquired, and go back. 15107c478bd9Sstevel@tonic-gate * 15117c478bd9Sstevel@tonic-gate * freemem is not protected by any lock. So, 15127c478bd9Sstevel@tonic-gate * we cannot have any assertion containing 15137c478bd9Sstevel@tonic-gate * freemem. 15147c478bd9Sstevel@tonic-gate */ 15157c478bd9Sstevel@tonic-gate freemem -= npages; 15167c478bd9Sstevel@tonic-gate 15177c478bd9Sstevel@tonic-gate while (p >= pcf) { 15187c478bd9Sstevel@tonic-gate if (p->pcf_count <= npages) { 15197c478bd9Sstevel@tonic-gate npages -= p->pcf_count; 15207c478bd9Sstevel@tonic-gate p->pcf_count = 0; 15217c478bd9Sstevel@tonic-gate } else { 15227c478bd9Sstevel@tonic-gate p->pcf_count -= (uint_t)npages; 15237c478bd9Sstevel@tonic-gate npages = 0; 15247c478bd9Sstevel@tonic-gate } 15257c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 15267c478bd9Sstevel@tonic-gate p--; 15277c478bd9Sstevel@tonic-gate } 15287c478bd9Sstevel@tonic-gate ASSERT(npages == 0); 15297c478bd9Sstevel@tonic-gate return (1); 15307c478bd9Sstevel@tonic-gate } 15317c478bd9Sstevel@tonic-gate p++; 15327c478bd9Sstevel@tonic-gate } 15337c478bd9Sstevel@tonic-gate 15347c478bd9Sstevel@tonic-gate /* 15357c478bd9Sstevel@tonic-gate * All of the pcf locks are held, there are not enough pages 15367c478bd9Sstevel@tonic-gate * to satisfy the request (npages < total). 15377c478bd9Sstevel@tonic-gate * Be sure to acquire the new_freemem_lock before dropping 15387c478bd9Sstevel@tonic-gate * the pcf locks. This prevents dropping wakeups in page_free(). 15397c478bd9Sstevel@tonic-gate * The order is always pcf_lock then new_freemem_lock. 15407c478bd9Sstevel@tonic-gate * 15417c478bd9Sstevel@tonic-gate * Since we hold all the pcf locks, it is a good time to set freemem. 15427c478bd9Sstevel@tonic-gate * 15437c478bd9Sstevel@tonic-gate * If the caller does not want to wait, return now. 15447c478bd9Sstevel@tonic-gate * Else turn the pageout daemon loose to find something 15457c478bd9Sstevel@tonic-gate * and wait till it does. 15467c478bd9Sstevel@tonic-gate * 15477c478bd9Sstevel@tonic-gate */ 15487c478bd9Sstevel@tonic-gate freemem = total; 15497c478bd9Sstevel@tonic-gate 15507c478bd9Sstevel@tonic-gate if ((flags & PG_WAIT) == 0) { 15517c478bd9Sstevel@tonic-gate pcf_release_all(); 15527c478bd9Sstevel@tonic-gate 15537c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_NOMEM, 15547c478bd9Sstevel@tonic-gate "page_create_nomem:npages %ld freemem %ld", npages, freemem); 15557c478bd9Sstevel@tonic-gate return (0); 15567c478bd9Sstevel@tonic-gate } 15577c478bd9Sstevel@tonic-gate 15587c478bd9Sstevel@tonic-gate ASSERT(proc_pageout != NULL); 15597c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 15607c478bd9Sstevel@tonic-gate 15617c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SLEEP_START, 15627c478bd9Sstevel@tonic-gate "page_create_sleep_start: freemem %ld needfree %ld", 15637c478bd9Sstevel@tonic-gate freemem, needfree); 15647c478bd9Sstevel@tonic-gate 15657c478bd9Sstevel@tonic-gate /* 15667c478bd9Sstevel@tonic-gate * We are going to wait. 15677c478bd9Sstevel@tonic-gate * We currently hold all of the pcf_locks, 15687c478bd9Sstevel@tonic-gate * get the new_freemem_lock (it protects freemem_wait), 15697c478bd9Sstevel@tonic-gate * before dropping the pcf_locks. 15707c478bd9Sstevel@tonic-gate */ 15717c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 15727c478bd9Sstevel@tonic-gate 15737c478bd9Sstevel@tonic-gate p = pcf; 15747c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 15757c478bd9Sstevel@tonic-gate p->pcf_wait++; 15767c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 15777c478bd9Sstevel@tonic-gate p++; 15787c478bd9Sstevel@tonic-gate } 15797c478bd9Sstevel@tonic-gate 15807c478bd9Sstevel@tonic-gate needfree += npages; 15817c478bd9Sstevel@tonic-gate freemem_wait++; 15827c478bd9Sstevel@tonic-gate 15837c478bd9Sstevel@tonic-gate cv_wait(&freemem_cv, &new_freemem_lock); 15847c478bd9Sstevel@tonic-gate 15857c478bd9Sstevel@tonic-gate freemem_wait--; 15867c478bd9Sstevel@tonic-gate needfree -= npages; 15877c478bd9Sstevel@tonic-gate 15887c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 15897c478bd9Sstevel@tonic-gate 15907c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SLEEP_END, 15917c478bd9Sstevel@tonic-gate "page_create_sleep_end: freemem %ld needfree %ld", 15927c478bd9Sstevel@tonic-gate freemem, needfree); 15937c478bd9Sstevel@tonic-gate 15947c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_not_enough_again); 15957c478bd9Sstevel@tonic-gate goto checkagain; 15967c478bd9Sstevel@tonic-gate } 15977c478bd9Sstevel@tonic-gate 15987c478bd9Sstevel@tonic-gate /* 15997c478bd9Sstevel@tonic-gate * A routine to do the opposite of page_create_wait(). 16007c478bd9Sstevel@tonic-gate */ 16017c478bd9Sstevel@tonic-gate void 16027c478bd9Sstevel@tonic-gate page_create_putback(spgcnt_t npages) 16037c478bd9Sstevel@tonic-gate { 16047c478bd9Sstevel@tonic-gate struct pcf *p; 16057c478bd9Sstevel@tonic-gate pgcnt_t lump; 16067c478bd9Sstevel@tonic-gate uint_t *which; 16077c478bd9Sstevel@tonic-gate 16087c478bd9Sstevel@tonic-gate /* 16097c478bd9Sstevel@tonic-gate * When a contiguous lump is broken up, we have to 16107c478bd9Sstevel@tonic-gate * deal with lots of pages (min 64) so lets spread 16117c478bd9Sstevel@tonic-gate * the wealth around. 16127c478bd9Sstevel@tonic-gate */ 16137c478bd9Sstevel@tonic-gate lump = roundup(npages, PCF_FANOUT) / PCF_FANOUT; 16147c478bd9Sstevel@tonic-gate freemem += npages; 16157c478bd9Sstevel@tonic-gate 16167c478bd9Sstevel@tonic-gate for (p = pcf; (npages > 0) && (p < &pcf[PCF_FANOUT]); p++) { 16177c478bd9Sstevel@tonic-gate which = &p->pcf_count; 16187c478bd9Sstevel@tonic-gate 16197c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 16207c478bd9Sstevel@tonic-gate 16217c478bd9Sstevel@tonic-gate if (p->pcf_block) { 16227c478bd9Sstevel@tonic-gate which = &p->pcf_reserve; 16237c478bd9Sstevel@tonic-gate } 16247c478bd9Sstevel@tonic-gate 16257c478bd9Sstevel@tonic-gate if (lump < npages) { 16267c478bd9Sstevel@tonic-gate *which += (uint_t)lump; 16277c478bd9Sstevel@tonic-gate npages -= lump; 16287c478bd9Sstevel@tonic-gate } else { 16297c478bd9Sstevel@tonic-gate *which += (uint_t)npages; 16307c478bd9Sstevel@tonic-gate npages = 0; 16317c478bd9Sstevel@tonic-gate } 16327c478bd9Sstevel@tonic-gate 16337c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 16347c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 16357c478bd9Sstevel@tonic-gate /* 16367c478bd9Sstevel@tonic-gate * Check to see if some other thread 16377c478bd9Sstevel@tonic-gate * is actually waiting. Another bucket 16387c478bd9Sstevel@tonic-gate * may have woken it up by now. If there 16397c478bd9Sstevel@tonic-gate * are no waiters, then set our pcf_wait 16407c478bd9Sstevel@tonic-gate * count to zero to avoid coming in here 16417c478bd9Sstevel@tonic-gate * next time. 16427c478bd9Sstevel@tonic-gate */ 16437c478bd9Sstevel@tonic-gate if (freemem_wait) { 16447c478bd9Sstevel@tonic-gate if (npages > 1) { 16457c478bd9Sstevel@tonic-gate cv_broadcast(&freemem_cv); 16467c478bd9Sstevel@tonic-gate } else { 16477c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 16487c478bd9Sstevel@tonic-gate } 16497c478bd9Sstevel@tonic-gate p->pcf_wait--; 16507c478bd9Sstevel@tonic-gate } else { 16517c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 16527c478bd9Sstevel@tonic-gate } 16537c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 16547c478bd9Sstevel@tonic-gate } 16557c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 16567c478bd9Sstevel@tonic-gate } 16577c478bd9Sstevel@tonic-gate ASSERT(npages == 0); 16587c478bd9Sstevel@tonic-gate } 16597c478bd9Sstevel@tonic-gate 16607c478bd9Sstevel@tonic-gate /* 16617c478bd9Sstevel@tonic-gate * A helper routine for page_create_get_something. 16627c478bd9Sstevel@tonic-gate * The indenting got to deep down there. 16637c478bd9Sstevel@tonic-gate * Unblock the pcf counters. Any pages freed after 16647c478bd9Sstevel@tonic-gate * pcf_block got set are moved to pcf_count and 16657c478bd9Sstevel@tonic-gate * wakeups (cv_broadcast() or cv_signal()) are done as needed. 16667c478bd9Sstevel@tonic-gate */ 16677c478bd9Sstevel@tonic-gate static void 16687c478bd9Sstevel@tonic-gate pcgs_unblock(void) 16697c478bd9Sstevel@tonic-gate { 16707c478bd9Sstevel@tonic-gate int i; 16717c478bd9Sstevel@tonic-gate struct pcf *p; 16727c478bd9Sstevel@tonic-gate 16737c478bd9Sstevel@tonic-gate /* Update freemem while we're here. */ 16747c478bd9Sstevel@tonic-gate freemem = 0; 16757c478bd9Sstevel@tonic-gate p = pcf; 16767c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 16777c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 16787c478bd9Sstevel@tonic-gate ASSERT(p->pcf_count == 0); 16797c478bd9Sstevel@tonic-gate p->pcf_count = p->pcf_reserve; 16807c478bd9Sstevel@tonic-gate p->pcf_block = 0; 16817c478bd9Sstevel@tonic-gate freemem += p->pcf_count; 16827c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 16837c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 16847c478bd9Sstevel@tonic-gate if (freemem_wait) { 16857c478bd9Sstevel@tonic-gate if (p->pcf_reserve > 1) { 16867c478bd9Sstevel@tonic-gate cv_broadcast(&freemem_cv); 16877c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 16887c478bd9Sstevel@tonic-gate } else { 16897c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 16907c478bd9Sstevel@tonic-gate p->pcf_wait--; 16917c478bd9Sstevel@tonic-gate } 16927c478bd9Sstevel@tonic-gate } else { 16937c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 16947c478bd9Sstevel@tonic-gate } 16957c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 16967c478bd9Sstevel@tonic-gate } 16977c478bd9Sstevel@tonic-gate p->pcf_reserve = 0; 16987c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 16997c478bd9Sstevel@tonic-gate p++; 17007c478bd9Sstevel@tonic-gate } 17017c478bd9Sstevel@tonic-gate } 17027c478bd9Sstevel@tonic-gate 17037c478bd9Sstevel@tonic-gate /* 17047c478bd9Sstevel@tonic-gate * Called from page_create_va() when both the cache and free lists 17057c478bd9Sstevel@tonic-gate * have been checked once. 17067c478bd9Sstevel@tonic-gate * 17077c478bd9Sstevel@tonic-gate * Either returns a page or panics since the accounting was done 17087c478bd9Sstevel@tonic-gate * way before we got here. 17097c478bd9Sstevel@tonic-gate * 17107c478bd9Sstevel@tonic-gate * We don't come here often, so leave the accounting on permanently. 17117c478bd9Sstevel@tonic-gate */ 17127c478bd9Sstevel@tonic-gate 17137c478bd9Sstevel@tonic-gate #define MAX_PCGS 100 17147c478bd9Sstevel@tonic-gate 17157c478bd9Sstevel@tonic-gate #ifdef DEBUG 17167c478bd9Sstevel@tonic-gate #define PCGS_TRIES 100 17177c478bd9Sstevel@tonic-gate #else /* DEBUG */ 17187c478bd9Sstevel@tonic-gate #define PCGS_TRIES 10 17197c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 17207c478bd9Sstevel@tonic-gate 17217c478bd9Sstevel@tonic-gate #ifdef VM_STATS 17227c478bd9Sstevel@tonic-gate uint_t pcgs_counts[PCGS_TRIES]; 17237c478bd9Sstevel@tonic-gate uint_t pcgs_too_many; 17247c478bd9Sstevel@tonic-gate uint_t pcgs_entered; 17257c478bd9Sstevel@tonic-gate uint_t pcgs_entered_noreloc; 17267c478bd9Sstevel@tonic-gate uint_t pcgs_locked; 17277c478bd9Sstevel@tonic-gate uint_t pcgs_cagelocked; 17287c478bd9Sstevel@tonic-gate #endif /* VM_STATS */ 17297c478bd9Sstevel@tonic-gate 17307c478bd9Sstevel@tonic-gate static page_t * 17317c478bd9Sstevel@tonic-gate page_create_get_something(vnode_t *vp, u_offset_t off, struct seg *seg, 17327c478bd9Sstevel@tonic-gate caddr_t vaddr, uint_t flags) 17337c478bd9Sstevel@tonic-gate { 17347c478bd9Sstevel@tonic-gate uint_t count; 17357c478bd9Sstevel@tonic-gate page_t *pp; 17367c478bd9Sstevel@tonic-gate uint_t locked, i; 17377c478bd9Sstevel@tonic-gate struct pcf *p; 17387c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 17397c478bd9Sstevel@tonic-gate int cagelocked = 0; 17407c478bd9Sstevel@tonic-gate 17417c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_entered); 17427c478bd9Sstevel@tonic-gate 17437c478bd9Sstevel@tonic-gate /* 17447c478bd9Sstevel@tonic-gate * Tap any reserve freelists: if we fail now, we'll die 17457c478bd9Sstevel@tonic-gate * since the page(s) we're looking for have already been 17467c478bd9Sstevel@tonic-gate * accounted for. 17477c478bd9Sstevel@tonic-gate */ 17487c478bd9Sstevel@tonic-gate flags |= PG_PANIC; 17497c478bd9Sstevel@tonic-gate 17507c478bd9Sstevel@tonic-gate if ((flags & PG_NORELOC) != 0) { 17517c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_entered_noreloc); 17527c478bd9Sstevel@tonic-gate /* 17537c478bd9Sstevel@tonic-gate * Requests for free pages from critical threads 17547c478bd9Sstevel@tonic-gate * such as pageout still won't throttle here, but 17557c478bd9Sstevel@tonic-gate * we must try again, to give the cageout thread 17567c478bd9Sstevel@tonic-gate * another chance to catch up. Since we already 17577c478bd9Sstevel@tonic-gate * accounted for the pages, we had better get them 17587c478bd9Sstevel@tonic-gate * this time. 17597c478bd9Sstevel@tonic-gate * 17607c478bd9Sstevel@tonic-gate * N.B. All non-critical threads acquire the pcgs_cagelock 17617c478bd9Sstevel@tonic-gate * to serialize access to the freelists. This implements a 17627c478bd9Sstevel@tonic-gate * turnstile-type synchornization to avoid starvation of 17637c478bd9Sstevel@tonic-gate * critical requests for PG_NORELOC memory by non-critical 17647c478bd9Sstevel@tonic-gate * threads: all non-critical threads must acquire a 'ticket' 17657c478bd9Sstevel@tonic-gate * before passing through, which entails making sure 17667c478bd9Sstevel@tonic-gate * kcage_freemem won't fall below minfree prior to grabbing 17677c478bd9Sstevel@tonic-gate * pages from the freelists. 17687c478bd9Sstevel@tonic-gate */ 17697c478bd9Sstevel@tonic-gate if (kcage_create_throttle(1, flags) == KCT_NONCRIT) { 17707c478bd9Sstevel@tonic-gate mutex_enter(&pcgs_cagelock); 17717c478bd9Sstevel@tonic-gate cagelocked = 1; 17727c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_cagelocked); 17737c478bd9Sstevel@tonic-gate } 17747c478bd9Sstevel@tonic-gate } 17757c478bd9Sstevel@tonic-gate 17767c478bd9Sstevel@tonic-gate /* 17777c478bd9Sstevel@tonic-gate * Time to get serious. 17787c478bd9Sstevel@tonic-gate * We failed to get a `correctly colored' page from both the 17797c478bd9Sstevel@tonic-gate * free and cache lists. 17807c478bd9Sstevel@tonic-gate * We escalate in stage. 17817c478bd9Sstevel@tonic-gate * 17827c478bd9Sstevel@tonic-gate * First try both lists without worring about color. 17837c478bd9Sstevel@tonic-gate * 17847c478bd9Sstevel@tonic-gate * Then, grab all page accounting locks (ie. pcf[]) and 17857c478bd9Sstevel@tonic-gate * steal any pages that they have and set the pcf_block flag to 17867c478bd9Sstevel@tonic-gate * stop deletions from the lists. This will help because 17877c478bd9Sstevel@tonic-gate * a page can get added to the free list while we are looking 17887c478bd9Sstevel@tonic-gate * at the cache list, then another page could be added to the cache 17897c478bd9Sstevel@tonic-gate * list allowing the page on the free list to be removed as we 17907c478bd9Sstevel@tonic-gate * move from looking at the cache list to the free list. This 17917c478bd9Sstevel@tonic-gate * could happen over and over. We would never find the page 17927c478bd9Sstevel@tonic-gate * we have accounted for. 17937c478bd9Sstevel@tonic-gate * 17947c478bd9Sstevel@tonic-gate * Noreloc pages are a subset of the global (relocatable) page pool. 17957c478bd9Sstevel@tonic-gate * They are not tracked separately in the pcf bins, so it is 17967c478bd9Sstevel@tonic-gate * impossible to know when doing pcf accounting if the available 17977c478bd9Sstevel@tonic-gate * page(s) are noreloc pages or not. When looking for a noreloc page 17987c478bd9Sstevel@tonic-gate * it is quite easy to end up here even if the global (relocatable) 17997c478bd9Sstevel@tonic-gate * page pool has plenty of free pages but the noreloc pool is empty. 18007c478bd9Sstevel@tonic-gate * 18017c478bd9Sstevel@tonic-gate * When the noreloc pool is empty (or low), additional noreloc pages 18027c478bd9Sstevel@tonic-gate * are created by converting pages from the global page pool. This 18037c478bd9Sstevel@tonic-gate * process will stall during pcf accounting if the pcf bins are 18047c478bd9Sstevel@tonic-gate * already locked. Such is the case when a noreloc allocation is 18057c478bd9Sstevel@tonic-gate * looping here in page_create_get_something waiting for more noreloc 18067c478bd9Sstevel@tonic-gate * pages to appear. 18077c478bd9Sstevel@tonic-gate * 18087c478bd9Sstevel@tonic-gate * Short of adding a new field to the pcf bins to accurately track 18097c478bd9Sstevel@tonic-gate * the number of free noreloc pages, we instead do not grab the 18107c478bd9Sstevel@tonic-gate * pcgs_lock, do not set the pcf blocks and do not timeout when 18117c478bd9Sstevel@tonic-gate * allocating a noreloc page. This allows noreloc allocations to 18127c478bd9Sstevel@tonic-gate * loop without blocking global page pool allocations. 18137c478bd9Sstevel@tonic-gate * 18147c478bd9Sstevel@tonic-gate * NOTE: the behaviour of page_create_get_something has not changed 18157c478bd9Sstevel@tonic-gate * for the case of global page pool allocations. 18167c478bd9Sstevel@tonic-gate */ 18177c478bd9Sstevel@tonic-gate 18187c478bd9Sstevel@tonic-gate flags &= ~PG_MATCH_COLOR; 18197c478bd9Sstevel@tonic-gate locked = 0; 182007ad560dSkchow #if defined(__i386) || defined(__amd64) 18217c478bd9Sstevel@tonic-gate /* 18227c478bd9Sstevel@tonic-gate * page_create_get_something may be called because 4g memory may be 18237c478bd9Sstevel@tonic-gate * depleted. Set flags to allow for relocation of base page below 18247c478bd9Sstevel@tonic-gate * 4g if necessary. 18257c478bd9Sstevel@tonic-gate */ 18267c478bd9Sstevel@tonic-gate if (physmax4g) 18277c478bd9Sstevel@tonic-gate flags |= (PGI_PGCPSZC0 | PGI_PGCPHIPRI); 18287c478bd9Sstevel@tonic-gate #endif 18297c478bd9Sstevel@tonic-gate 18307c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, vaddr, PAGESIZE); 18317c478bd9Sstevel@tonic-gate 18327c478bd9Sstevel@tonic-gate for (count = 0; kcage_on || count < MAX_PCGS; count++) { 18337c478bd9Sstevel@tonic-gate pp = page_get_freelist(vp, off, seg, vaddr, PAGESIZE, 18347c478bd9Sstevel@tonic-gate flags, lgrp); 18357c478bd9Sstevel@tonic-gate if (pp == NULL) { 18367c478bd9Sstevel@tonic-gate pp = page_get_cachelist(vp, off, seg, vaddr, 18377c478bd9Sstevel@tonic-gate flags, lgrp); 18387c478bd9Sstevel@tonic-gate } 18397c478bd9Sstevel@tonic-gate if (pp == NULL) { 18407c478bd9Sstevel@tonic-gate /* 18417c478bd9Sstevel@tonic-gate * Serialize. Don't fight with other pcgs(). 18427c478bd9Sstevel@tonic-gate */ 18437c478bd9Sstevel@tonic-gate if (!locked && (!kcage_on || !(flags & PG_NORELOC))) { 18447c478bd9Sstevel@tonic-gate mutex_enter(&pcgs_lock); 18457c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_locked); 18467c478bd9Sstevel@tonic-gate locked = 1; 18477c478bd9Sstevel@tonic-gate p = pcf; 18487c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 18497c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 18507c478bd9Sstevel@tonic-gate ASSERT(p->pcf_block == 0); 18517c478bd9Sstevel@tonic-gate p->pcf_block = 1; 18527c478bd9Sstevel@tonic-gate p->pcf_reserve = p->pcf_count; 18537c478bd9Sstevel@tonic-gate p->pcf_count = 0; 18547c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 18557c478bd9Sstevel@tonic-gate p++; 18567c478bd9Sstevel@tonic-gate } 18577c478bd9Sstevel@tonic-gate freemem = 0; 18587c478bd9Sstevel@tonic-gate } 18597c478bd9Sstevel@tonic-gate 18607c478bd9Sstevel@tonic-gate if (count) { 18617c478bd9Sstevel@tonic-gate /* 18627c478bd9Sstevel@tonic-gate * Since page_free() puts pages on 18637c478bd9Sstevel@tonic-gate * a list then accounts for it, we 18647c478bd9Sstevel@tonic-gate * just have to wait for page_free() 18657c478bd9Sstevel@tonic-gate * to unlock any page it was working 18667c478bd9Sstevel@tonic-gate * with. The page_lock()-page_reclaim() 18677c478bd9Sstevel@tonic-gate * path falls in the same boat. 18687c478bd9Sstevel@tonic-gate * 18697c478bd9Sstevel@tonic-gate * We don't need to check on the 18707c478bd9Sstevel@tonic-gate * PG_WAIT flag, we have already 18717c478bd9Sstevel@tonic-gate * accounted for the page we are 18727c478bd9Sstevel@tonic-gate * looking for in page_create_va(). 18737c478bd9Sstevel@tonic-gate * 18747c478bd9Sstevel@tonic-gate * We just wait a moment to let any 18757c478bd9Sstevel@tonic-gate * locked pages on the lists free up, 18767c478bd9Sstevel@tonic-gate * then continue around and try again. 18777c478bd9Sstevel@tonic-gate * 18787c478bd9Sstevel@tonic-gate * Will be awakened by set_freemem(). 18797c478bd9Sstevel@tonic-gate */ 18807c478bd9Sstevel@tonic-gate mutex_enter(&pcgs_wait_lock); 18817c478bd9Sstevel@tonic-gate cv_wait(&pcgs_cv, &pcgs_wait_lock); 18827c478bd9Sstevel@tonic-gate mutex_exit(&pcgs_wait_lock); 18837c478bd9Sstevel@tonic-gate } 18847c478bd9Sstevel@tonic-gate } else { 18857c478bd9Sstevel@tonic-gate #ifdef VM_STATS 18867c478bd9Sstevel@tonic-gate if (count >= PCGS_TRIES) { 18877c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_too_many); 18887c478bd9Sstevel@tonic-gate } else { 18897c478bd9Sstevel@tonic-gate VM_STAT_ADD(pcgs_counts[count]); 18907c478bd9Sstevel@tonic-gate } 18917c478bd9Sstevel@tonic-gate #endif 18927c478bd9Sstevel@tonic-gate if (locked) { 18937c478bd9Sstevel@tonic-gate pcgs_unblock(); 18947c478bd9Sstevel@tonic-gate mutex_exit(&pcgs_lock); 18957c478bd9Sstevel@tonic-gate } 18967c478bd9Sstevel@tonic-gate if (cagelocked) 18977c478bd9Sstevel@tonic-gate mutex_exit(&pcgs_cagelock); 18987c478bd9Sstevel@tonic-gate return (pp); 18997c478bd9Sstevel@tonic-gate } 19007c478bd9Sstevel@tonic-gate } 19017c478bd9Sstevel@tonic-gate /* 19027c478bd9Sstevel@tonic-gate * we go down holding the pcf locks. 19037c478bd9Sstevel@tonic-gate */ 19047c478bd9Sstevel@tonic-gate panic("no %spage found %d", 19057c478bd9Sstevel@tonic-gate ((flags & PG_NORELOC) ? "non-reloc " : ""), count); 19067c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 19077c478bd9Sstevel@tonic-gate } 19087c478bd9Sstevel@tonic-gate 19097c478bd9Sstevel@tonic-gate /* 19107c478bd9Sstevel@tonic-gate * Create enough pages for "bytes" worth of data starting at 19117c478bd9Sstevel@tonic-gate * "off" in "vp". 19127c478bd9Sstevel@tonic-gate * 19137c478bd9Sstevel@tonic-gate * Where flag must be one of: 19147c478bd9Sstevel@tonic-gate * 19157c478bd9Sstevel@tonic-gate * PG_EXCL: Exclusive create (fail if any page already 19167c478bd9Sstevel@tonic-gate * exists in the page cache) which does not 19177c478bd9Sstevel@tonic-gate * wait for memory to become available. 19187c478bd9Sstevel@tonic-gate * 19197c478bd9Sstevel@tonic-gate * PG_WAIT: Non-exclusive create which can wait for 19207c478bd9Sstevel@tonic-gate * memory to become available. 19217c478bd9Sstevel@tonic-gate * 19227c478bd9Sstevel@tonic-gate * PG_PHYSCONTIG: Allocate physically contiguous pages. 19237c478bd9Sstevel@tonic-gate * (Not Supported) 19247c478bd9Sstevel@tonic-gate * 19257c478bd9Sstevel@tonic-gate * A doubly linked list of pages is returned to the caller. Each page 19267c478bd9Sstevel@tonic-gate * on the list has the "exclusive" (p_selock) lock and "iolock" (p_iolock) 19277c478bd9Sstevel@tonic-gate * lock. 19287c478bd9Sstevel@tonic-gate * 19297c478bd9Sstevel@tonic-gate * Unable to change the parameters to page_create() in a minor release, 19307c478bd9Sstevel@tonic-gate * we renamed page_create() to page_create_va(), changed all known calls 19317c478bd9Sstevel@tonic-gate * from page_create() to page_create_va(), and created this wrapper. 19327c478bd9Sstevel@tonic-gate * 19337c478bd9Sstevel@tonic-gate * Upon a major release, we should break compatibility by deleting this 19347c478bd9Sstevel@tonic-gate * wrapper, and replacing all the strings "page_create_va", with "page_create". 19357c478bd9Sstevel@tonic-gate * 19367c478bd9Sstevel@tonic-gate * NOTE: There is a copy of this interface as page_create_io() in 19377c478bd9Sstevel@tonic-gate * i86/vm/vm_machdep.c. Any bugs fixed here should be applied 19387c478bd9Sstevel@tonic-gate * there. 19397c478bd9Sstevel@tonic-gate */ 19407c478bd9Sstevel@tonic-gate page_t * 19417c478bd9Sstevel@tonic-gate page_create(vnode_t *vp, u_offset_t off, size_t bytes, uint_t flags) 19427c478bd9Sstevel@tonic-gate { 19437c478bd9Sstevel@tonic-gate caddr_t random_vaddr; 19447c478bd9Sstevel@tonic-gate struct seg kseg; 19457c478bd9Sstevel@tonic-gate 19467c478bd9Sstevel@tonic-gate #ifdef DEBUG 19477c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Using deprecated interface page_create: caller %p", 19487c478bd9Sstevel@tonic-gate (void *)caller()); 19497c478bd9Sstevel@tonic-gate #endif 19507c478bd9Sstevel@tonic-gate 19517c478bd9Sstevel@tonic-gate random_vaddr = (caddr_t)(((uintptr_t)vp >> 7) ^ 19527c478bd9Sstevel@tonic-gate (uintptr_t)(off >> PAGESHIFT)); 19537c478bd9Sstevel@tonic-gate kseg.s_as = &kas; 19547c478bd9Sstevel@tonic-gate 19557c478bd9Sstevel@tonic-gate return (page_create_va(vp, off, bytes, flags, &kseg, random_vaddr)); 19567c478bd9Sstevel@tonic-gate } 19577c478bd9Sstevel@tonic-gate 19587c478bd9Sstevel@tonic-gate #ifdef DEBUG 19597c478bd9Sstevel@tonic-gate uint32_t pg_alloc_pgs_mtbf = 0; 19607c478bd9Sstevel@tonic-gate #endif 19617c478bd9Sstevel@tonic-gate 19627c478bd9Sstevel@tonic-gate /* 19637c478bd9Sstevel@tonic-gate * Used for large page support. It will attempt to allocate 19647c478bd9Sstevel@tonic-gate * a large page(s) off the freelist. 19657c478bd9Sstevel@tonic-gate * 19667c478bd9Sstevel@tonic-gate * Returns non zero on failure. 19677c478bd9Sstevel@tonic-gate */ 19687c478bd9Sstevel@tonic-gate int 1969e44bd21cSsusans page_alloc_pages(struct vnode *vp, struct seg *seg, caddr_t addr, 1970e44bd21cSsusans page_t **basepp, page_t *ppa[], uint_t szc, int anypgsz) 19717c478bd9Sstevel@tonic-gate { 19727c478bd9Sstevel@tonic-gate pgcnt_t npgs, curnpgs, totpgs; 19737c478bd9Sstevel@tonic-gate size_t pgsz; 19747c478bd9Sstevel@tonic-gate page_t *pplist = NULL, *pp; 19757c478bd9Sstevel@tonic-gate int err = 0; 19767c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 19777c478bd9Sstevel@tonic-gate 19787c478bd9Sstevel@tonic-gate ASSERT(szc != 0 && szc <= (page_num_pagesizes() - 1)); 19797c478bd9Sstevel@tonic-gate 19807c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[0]); 19817c478bd9Sstevel@tonic-gate 19827c478bd9Sstevel@tonic-gate #ifdef DEBUG 19837c478bd9Sstevel@tonic-gate if (pg_alloc_pgs_mtbf && !(gethrtime() % pg_alloc_pgs_mtbf)) { 19847c478bd9Sstevel@tonic-gate return (ENOMEM); 19857c478bd9Sstevel@tonic-gate } 19867c478bd9Sstevel@tonic-gate #endif 19877c478bd9Sstevel@tonic-gate 19887c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(szc); 19897c478bd9Sstevel@tonic-gate totpgs = curnpgs = npgs = pgsz >> PAGESHIFT; 19907c478bd9Sstevel@tonic-gate 19917c478bd9Sstevel@tonic-gate ASSERT(((uintptr_t)addr & (pgsz - 1)) == 0); 19927c478bd9Sstevel@tonic-gate /* 19937c478bd9Sstevel@tonic-gate * One must be NULL but not both. 19947c478bd9Sstevel@tonic-gate * And one must be non NULL but not both. 19957c478bd9Sstevel@tonic-gate */ 19967c478bd9Sstevel@tonic-gate ASSERT(basepp != NULL || ppa != NULL); 19977c478bd9Sstevel@tonic-gate ASSERT(basepp == NULL || ppa == NULL); 19987c478bd9Sstevel@tonic-gate 19997c478bd9Sstevel@tonic-gate (void) page_create_wait(npgs, PG_WAIT); 20007c478bd9Sstevel@tonic-gate 20017c478bd9Sstevel@tonic-gate while (npgs && szc) { 20027c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, addr, pgsz); 2003e44bd21cSsusans pp = page_get_freelist(vp, 0, seg, addr, pgsz, 0, lgrp); 20047c478bd9Sstevel@tonic-gate if (pp != NULL) { 20057c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[1]); 20067c478bd9Sstevel@tonic-gate page_list_concat(&pplist, &pp); 20077c478bd9Sstevel@tonic-gate ASSERT(npgs >= curnpgs); 20087c478bd9Sstevel@tonic-gate npgs -= curnpgs; 20097c478bd9Sstevel@tonic-gate } else if (anypgsz) { 20107c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[2]); 20117c478bd9Sstevel@tonic-gate szc--; 20127c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(szc); 20137c478bd9Sstevel@tonic-gate curnpgs = pgsz >> PAGESHIFT; 20147c478bd9Sstevel@tonic-gate } else { 20157c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[3]); 20167c478bd9Sstevel@tonic-gate ASSERT(npgs == totpgs); 20177c478bd9Sstevel@tonic-gate page_create_putback(npgs); 20187c478bd9Sstevel@tonic-gate return (ENOMEM); 20197c478bd9Sstevel@tonic-gate } 20207c478bd9Sstevel@tonic-gate } 20217c478bd9Sstevel@tonic-gate if (szc == 0) { 20227c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[4]); 20237c478bd9Sstevel@tonic-gate ASSERT(npgs != 0); 20247c478bd9Sstevel@tonic-gate page_create_putback(npgs); 20257c478bd9Sstevel@tonic-gate err = ENOMEM; 20267c478bd9Sstevel@tonic-gate } else if (basepp != NULL) { 20277c478bd9Sstevel@tonic-gate ASSERT(npgs == 0); 20287c478bd9Sstevel@tonic-gate ASSERT(ppa == NULL); 20297c478bd9Sstevel@tonic-gate *basepp = pplist; 20307c478bd9Sstevel@tonic-gate } 20317c478bd9Sstevel@tonic-gate 20327c478bd9Sstevel@tonic-gate npgs = totpgs - npgs; 20337c478bd9Sstevel@tonic-gate pp = pplist; 20347c478bd9Sstevel@tonic-gate 20357c478bd9Sstevel@tonic-gate /* 20367c478bd9Sstevel@tonic-gate * Clear the free and age bits. Also if we were passed in a ppa then 20377c478bd9Sstevel@tonic-gate * fill it in with all the constituent pages from the large page. But 20387c478bd9Sstevel@tonic-gate * if we failed to allocate all the pages just free what we got. 20397c478bd9Sstevel@tonic-gate */ 20407c478bd9Sstevel@tonic-gate while (npgs != 0) { 20417c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(pp)); 20427c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp)); 20437c478bd9Sstevel@tonic-gate if (ppa != NULL || err != 0) { 20447c478bd9Sstevel@tonic-gate if (err == 0) { 20457c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[5]); 20467c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 20477c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 20487c478bd9Sstevel@tonic-gate page_sub(&pplist, pp); 20497c478bd9Sstevel@tonic-gate *ppa++ = pp; 20507c478bd9Sstevel@tonic-gate npgs--; 20517c478bd9Sstevel@tonic-gate } else { 20527c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[6]); 20537c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc != 0); 20547c478bd9Sstevel@tonic-gate curnpgs = page_get_pagecnt(pp->p_szc); 20557c478bd9Sstevel@tonic-gate page_list_break(&pp, &pplist, curnpgs); 20567c478bd9Sstevel@tonic-gate page_list_add_pages(pp, 0); 20577c478bd9Sstevel@tonic-gate page_create_putback(curnpgs); 20587c478bd9Sstevel@tonic-gate ASSERT(npgs >= curnpgs); 20597c478bd9Sstevel@tonic-gate npgs -= curnpgs; 20607c478bd9Sstevel@tonic-gate } 20617c478bd9Sstevel@tonic-gate pp = pplist; 20627c478bd9Sstevel@tonic-gate } else { 20637c478bd9Sstevel@tonic-gate VM_STAT_ADD(alloc_pages[7]); 20647c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 20657c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 20667c478bd9Sstevel@tonic-gate pp = pp->p_next; 20677c478bd9Sstevel@tonic-gate npgs--; 20687c478bd9Sstevel@tonic-gate } 20697c478bd9Sstevel@tonic-gate } 20707c478bd9Sstevel@tonic-gate return (err); 20717c478bd9Sstevel@tonic-gate } 20727c478bd9Sstevel@tonic-gate 20737c478bd9Sstevel@tonic-gate /* 20747c478bd9Sstevel@tonic-gate * Get a single large page off of the freelists, and set it up for use. 20757c478bd9Sstevel@tonic-gate * Number of bytes requested must be a supported page size. 20767c478bd9Sstevel@tonic-gate * 20777c478bd9Sstevel@tonic-gate * Note that this call may fail even if there is sufficient 20787c478bd9Sstevel@tonic-gate * memory available or PG_WAIT is set, so the caller must 20797c478bd9Sstevel@tonic-gate * be willing to fallback on page_create_va(), block and retry, 20807c478bd9Sstevel@tonic-gate * or fail the requester. 20817c478bd9Sstevel@tonic-gate */ 20827c478bd9Sstevel@tonic-gate page_t * 20837c478bd9Sstevel@tonic-gate page_create_va_large(vnode_t *vp, u_offset_t off, size_t bytes, uint_t flags, 20847c478bd9Sstevel@tonic-gate struct seg *seg, caddr_t vaddr, void *arg) 20857c478bd9Sstevel@tonic-gate { 20867c478bd9Sstevel@tonic-gate pgcnt_t npages, pcftotal; 20877c478bd9Sstevel@tonic-gate page_t *pp; 20887c478bd9Sstevel@tonic-gate page_t *rootpp; 20897c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 20907c478bd9Sstevel@tonic-gate uint_t enough; 20917c478bd9Sstevel@tonic-gate uint_t pcf_index; 20927c478bd9Sstevel@tonic-gate uint_t i; 20937c478bd9Sstevel@tonic-gate struct pcf *p; 20947c478bd9Sstevel@tonic-gate struct pcf *q; 20957c478bd9Sstevel@tonic-gate lgrp_id_t *lgrpid = (lgrp_id_t *)arg; 20967c478bd9Sstevel@tonic-gate 20977c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 20987c478bd9Sstevel@tonic-gate 20997c478bd9Sstevel@tonic-gate ASSERT((flags & ~(PG_EXCL | PG_WAIT | 21007c478bd9Sstevel@tonic-gate PG_NORELOC | PG_PANIC | PG_PUSHPAGE)) == 0); 21017c478bd9Sstevel@tonic-gate /* but no others */ 21027c478bd9Sstevel@tonic-gate 21037c478bd9Sstevel@tonic-gate ASSERT((flags & PG_EXCL) == PG_EXCL); 21047c478bd9Sstevel@tonic-gate 21057c478bd9Sstevel@tonic-gate npages = btop(bytes); 21067c478bd9Sstevel@tonic-gate 21077c478bd9Sstevel@tonic-gate if (!kcage_on || panicstr) { 21087c478bd9Sstevel@tonic-gate /* 21097c478bd9Sstevel@tonic-gate * Cage is OFF, or we are single threaded in 21107c478bd9Sstevel@tonic-gate * panic, so make everything a RELOC request. 21117c478bd9Sstevel@tonic-gate */ 21127c478bd9Sstevel@tonic-gate flags &= ~PG_NORELOC; 21137c478bd9Sstevel@tonic-gate } 21147c478bd9Sstevel@tonic-gate 21157c478bd9Sstevel@tonic-gate /* 21167c478bd9Sstevel@tonic-gate * Make sure there's adequate physical memory available. 21177c478bd9Sstevel@tonic-gate * Note: PG_WAIT is ignored here. 21187c478bd9Sstevel@tonic-gate */ 21197c478bd9Sstevel@tonic-gate if (freemem <= throttlefree + npages) { 21207c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[1]); 21217c478bd9Sstevel@tonic-gate return (NULL); 21227c478bd9Sstevel@tonic-gate } 21237c478bd9Sstevel@tonic-gate 21247c478bd9Sstevel@tonic-gate /* 21257c478bd9Sstevel@tonic-gate * If cage is on, dampen draw from cage when available 21267c478bd9Sstevel@tonic-gate * cage space is low. 21277c478bd9Sstevel@tonic-gate */ 21287c478bd9Sstevel@tonic-gate if ((flags & (PG_NORELOC | PG_WAIT)) == (PG_NORELOC | PG_WAIT) && 21297c478bd9Sstevel@tonic-gate kcage_freemem < kcage_throttlefree + npages) { 21307c478bd9Sstevel@tonic-gate 21317c478bd9Sstevel@tonic-gate /* 21327c478bd9Sstevel@tonic-gate * The cage is on, the caller wants PG_NORELOC 21337c478bd9Sstevel@tonic-gate * pages and available cage memory is very low. 21347c478bd9Sstevel@tonic-gate * Call kcage_create_throttle() to attempt to 21357c478bd9Sstevel@tonic-gate * control demand on the cage. 21367c478bd9Sstevel@tonic-gate */ 21377c478bd9Sstevel@tonic-gate if (kcage_create_throttle(npages, flags) == KCT_FAILURE) { 21387c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[2]); 21397c478bd9Sstevel@tonic-gate return (NULL); 21407c478bd9Sstevel@tonic-gate } 21417c478bd9Sstevel@tonic-gate } 21427c478bd9Sstevel@tonic-gate 21437c478bd9Sstevel@tonic-gate enough = 0; 21447c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 21457c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 21467c478bd9Sstevel@tonic-gate q = &pcf[PCF_FANOUT]; 21477c478bd9Sstevel@tonic-gate for (pcftotal = 0, i = 0; i < PCF_FANOUT; i++) { 21487c478bd9Sstevel@tonic-gate if (p->pcf_count > npages) { 21497c478bd9Sstevel@tonic-gate /* 21507c478bd9Sstevel@tonic-gate * a good one to try. 21517c478bd9Sstevel@tonic-gate */ 21527c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 21537c478bd9Sstevel@tonic-gate if (p->pcf_count > npages) { 21547c478bd9Sstevel@tonic-gate p->pcf_count -= (uint_t)npages; 21557c478bd9Sstevel@tonic-gate /* 21567c478bd9Sstevel@tonic-gate * freemem is not protected by any lock. 21577c478bd9Sstevel@tonic-gate * Thus, we cannot have any assertion 21587c478bd9Sstevel@tonic-gate * containing freemem here. 21597c478bd9Sstevel@tonic-gate */ 21607c478bd9Sstevel@tonic-gate freemem -= npages; 21617c478bd9Sstevel@tonic-gate enough = 1; 21627c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 21637c478bd9Sstevel@tonic-gate break; 21647c478bd9Sstevel@tonic-gate } 21657c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 21667c478bd9Sstevel@tonic-gate } 21677c478bd9Sstevel@tonic-gate pcftotal += p->pcf_count; 21687c478bd9Sstevel@tonic-gate p++; 21697c478bd9Sstevel@tonic-gate if (p >= q) { 21707c478bd9Sstevel@tonic-gate p = pcf; 21717c478bd9Sstevel@tonic-gate } 21727c478bd9Sstevel@tonic-gate } 21737c478bd9Sstevel@tonic-gate 21747c478bd9Sstevel@tonic-gate if (!enough) { 21757c478bd9Sstevel@tonic-gate /* If there isn't enough memory available, give up. */ 21767c478bd9Sstevel@tonic-gate if (pcftotal < npages) { 21777c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[3]); 21787c478bd9Sstevel@tonic-gate return (NULL); 21797c478bd9Sstevel@tonic-gate } 21807c478bd9Sstevel@tonic-gate 21817c478bd9Sstevel@tonic-gate /* try to collect pages from several pcf bins */ 21827c478bd9Sstevel@tonic-gate for (p = pcf, pcftotal = 0, i = 0; i < PCF_FANOUT; i++) { 21837c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 21847c478bd9Sstevel@tonic-gate pcftotal += p->pcf_count; 21857c478bd9Sstevel@tonic-gate if (pcftotal >= npages) { 21867c478bd9Sstevel@tonic-gate /* 21877c478bd9Sstevel@tonic-gate * Wow! There are enough pages laying around 21887c478bd9Sstevel@tonic-gate * to satisfy the request. Do the accounting, 21897c478bd9Sstevel@tonic-gate * drop the locks we acquired, and go back. 21907c478bd9Sstevel@tonic-gate * 21917c478bd9Sstevel@tonic-gate * freemem is not protected by any lock. So, 21927c478bd9Sstevel@tonic-gate * we cannot have any assertion containing 21937c478bd9Sstevel@tonic-gate * freemem. 21947c478bd9Sstevel@tonic-gate */ 21957c478bd9Sstevel@tonic-gate pgcnt_t tpages = npages; 21967c478bd9Sstevel@tonic-gate freemem -= npages; 21977c478bd9Sstevel@tonic-gate while (p >= pcf) { 21987c478bd9Sstevel@tonic-gate if (p->pcf_count <= tpages) { 21997c478bd9Sstevel@tonic-gate tpages -= p->pcf_count; 22007c478bd9Sstevel@tonic-gate p->pcf_count = 0; 22017c478bd9Sstevel@tonic-gate } else { 22027c478bd9Sstevel@tonic-gate p->pcf_count -= (uint_t)tpages; 22037c478bd9Sstevel@tonic-gate tpages = 0; 22047c478bd9Sstevel@tonic-gate } 22057c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 22067c478bd9Sstevel@tonic-gate p--; 22077c478bd9Sstevel@tonic-gate } 22087c478bd9Sstevel@tonic-gate ASSERT(tpages == 0); 22097c478bd9Sstevel@tonic-gate break; 22107c478bd9Sstevel@tonic-gate } 22117c478bd9Sstevel@tonic-gate p++; 22127c478bd9Sstevel@tonic-gate } 22137c478bd9Sstevel@tonic-gate if (i == PCF_FANOUT) { 22147c478bd9Sstevel@tonic-gate /* failed to collect pages - release the locks */ 22157c478bd9Sstevel@tonic-gate while (--p >= pcf) { 22167c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 22177c478bd9Sstevel@tonic-gate } 22187c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[4]); 22197c478bd9Sstevel@tonic-gate return (NULL); 22207c478bd9Sstevel@tonic-gate } 22217c478bd9Sstevel@tonic-gate } 22227c478bd9Sstevel@tonic-gate 22237c478bd9Sstevel@tonic-gate /* 22247c478bd9Sstevel@tonic-gate * This is where this function behaves fundamentally differently 22257c478bd9Sstevel@tonic-gate * than page_create_va(); since we're intending to map the page 22267c478bd9Sstevel@tonic-gate * with a single TTE, we have to get it as a physically contiguous 22277c478bd9Sstevel@tonic-gate * hardware pagesize chunk. If we can't, we fail. 22287c478bd9Sstevel@tonic-gate */ 22297c478bd9Sstevel@tonic-gate if (lgrpid != NULL && *lgrpid >= 0 && *lgrpid <= lgrp_alloc_max && 22307c478bd9Sstevel@tonic-gate LGRP_EXISTS(lgrp_table[*lgrpid])) 22317c478bd9Sstevel@tonic-gate lgrp = lgrp_table[*lgrpid]; 22327c478bd9Sstevel@tonic-gate else 22337c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, vaddr, bytes); 22347c478bd9Sstevel@tonic-gate 22357c478bd9Sstevel@tonic-gate if ((rootpp = page_get_freelist(&kvp, off, seg, vaddr, 22367c478bd9Sstevel@tonic-gate bytes, flags & ~PG_MATCH_COLOR, lgrp)) == NULL) { 22377c478bd9Sstevel@tonic-gate page_create_putback(npages); 22387c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[5]); 22397c478bd9Sstevel@tonic-gate return (NULL); 22407c478bd9Sstevel@tonic-gate } 22417c478bd9Sstevel@tonic-gate 22427c478bd9Sstevel@tonic-gate /* 22437c478bd9Sstevel@tonic-gate * if we got the page with the wrong mtype give it back this is a 22447c478bd9Sstevel@tonic-gate * workaround for CR 6249718. When CR 6249718 is fixed we never get 22457c478bd9Sstevel@tonic-gate * inside "if" and the workaround becomes just a nop 22467c478bd9Sstevel@tonic-gate */ 22477c478bd9Sstevel@tonic-gate if (kcage_on && (flags & PG_NORELOC) && !PP_ISNORELOC(rootpp)) { 22487c478bd9Sstevel@tonic-gate page_list_add_pages(rootpp, 0); 22497c478bd9Sstevel@tonic-gate page_create_putback(npages); 22507c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[6]); 22517c478bd9Sstevel@tonic-gate return (NULL); 22527c478bd9Sstevel@tonic-gate } 22537c478bd9Sstevel@tonic-gate 22547c478bd9Sstevel@tonic-gate /* 22557c478bd9Sstevel@tonic-gate * If satisfying this request has left us with too little 22567c478bd9Sstevel@tonic-gate * memory, start the wheels turning to get some back. The 22577c478bd9Sstevel@tonic-gate * first clause of the test prevents waking up the pageout 22587c478bd9Sstevel@tonic-gate * daemon in situations where it would decide that there's 22597c478bd9Sstevel@tonic-gate * nothing to do. 22607c478bd9Sstevel@tonic-gate */ 22617c478bd9Sstevel@tonic-gate if (nscan < desscan && freemem < minfree) { 22627c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGEOUT_CV_SIGNAL, 22637c478bd9Sstevel@tonic-gate "pageout_cv_signal:freemem %ld", freemem); 22647c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 22657c478bd9Sstevel@tonic-gate } 22667c478bd9Sstevel@tonic-gate 22677c478bd9Sstevel@tonic-gate pp = rootpp; 22687c478bd9Sstevel@tonic-gate while (npages--) { 22697c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 22707c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == NULL); 22717c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 22727c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 22737c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 22747c478bd9Sstevel@tonic-gate if (!page_hashin(pp, vp, off, NULL)) 22757c478bd9Sstevel@tonic-gate panic("page_create_large: hashin failed: page %p", 22767c478bd9Sstevel@tonic-gate (void *)pp); 22777c478bd9Sstevel@tonic-gate page_io_lock(pp); 22787c478bd9Sstevel@tonic-gate off += PAGESIZE; 22797c478bd9Sstevel@tonic-gate pp = pp->p_next; 22807c478bd9Sstevel@tonic-gate } 22817c478bd9Sstevel@tonic-gate 22827c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_large_cnt[0]); 22837c478bd9Sstevel@tonic-gate return (rootpp); 22847c478bd9Sstevel@tonic-gate } 22857c478bd9Sstevel@tonic-gate 22867c478bd9Sstevel@tonic-gate page_t * 22877c478bd9Sstevel@tonic-gate page_create_va(vnode_t *vp, u_offset_t off, size_t bytes, uint_t flags, 22887c478bd9Sstevel@tonic-gate struct seg *seg, caddr_t vaddr) 22897c478bd9Sstevel@tonic-gate { 22907c478bd9Sstevel@tonic-gate page_t *plist = NULL; 22917c478bd9Sstevel@tonic-gate pgcnt_t npages; 22927c478bd9Sstevel@tonic-gate pgcnt_t found_on_free = 0; 22937c478bd9Sstevel@tonic-gate pgcnt_t pages_req; 22947c478bd9Sstevel@tonic-gate page_t *npp = NULL; 22957c478bd9Sstevel@tonic-gate uint_t enough; 22967c478bd9Sstevel@tonic-gate uint_t i; 22977c478bd9Sstevel@tonic-gate uint_t pcf_index; 22987c478bd9Sstevel@tonic-gate struct pcf *p; 22997c478bd9Sstevel@tonic-gate struct pcf *q; 23007c478bd9Sstevel@tonic-gate lgrp_t *lgrp; 23017c478bd9Sstevel@tonic-gate 23027c478bd9Sstevel@tonic-gate TRACE_4(TR_FAC_VM, TR_PAGE_CREATE_START, 23037c478bd9Sstevel@tonic-gate "page_create_start:vp %p off %llx bytes %lu flags %x", 23047c478bd9Sstevel@tonic-gate vp, off, bytes, flags); 23057c478bd9Sstevel@tonic-gate 23067c478bd9Sstevel@tonic-gate ASSERT(bytes != 0 && vp != NULL); 23077c478bd9Sstevel@tonic-gate 23087c478bd9Sstevel@tonic-gate if ((flags & PG_EXCL) == 0 && (flags & PG_WAIT) == 0) { 23097c478bd9Sstevel@tonic-gate panic("page_create: invalid flags"); 23107c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 23117c478bd9Sstevel@tonic-gate } 23127c478bd9Sstevel@tonic-gate ASSERT((flags & ~(PG_EXCL | PG_WAIT | 23137c478bd9Sstevel@tonic-gate PG_NORELOC | PG_PANIC | PG_PUSHPAGE)) == 0); 23147c478bd9Sstevel@tonic-gate /* but no others */ 23157c478bd9Sstevel@tonic-gate 23167c478bd9Sstevel@tonic-gate pages_req = npages = btopr(bytes); 23177c478bd9Sstevel@tonic-gate /* 23187c478bd9Sstevel@tonic-gate * Try to see whether request is too large to *ever* be 23197c478bd9Sstevel@tonic-gate * satisfied, in order to prevent deadlock. We arbitrarily 23207c478bd9Sstevel@tonic-gate * decide to limit maximum size requests to max_page_get. 23217c478bd9Sstevel@tonic-gate */ 23227c478bd9Sstevel@tonic-gate if (npages >= max_page_get) { 23237c478bd9Sstevel@tonic-gate if ((flags & PG_WAIT) == 0) { 23247c478bd9Sstevel@tonic-gate TRACE_4(TR_FAC_VM, TR_PAGE_CREATE_TOOBIG, 23257c478bd9Sstevel@tonic-gate "page_create_toobig:vp %p off %llx npages " 23267c478bd9Sstevel@tonic-gate "%lu max_page_get %lu", 23277c478bd9Sstevel@tonic-gate vp, off, npages, max_page_get); 23287c478bd9Sstevel@tonic-gate return (NULL); 23297c478bd9Sstevel@tonic-gate } else { 23307c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 23317c478bd9Sstevel@tonic-gate "Request for too much kernel memory " 23327c478bd9Sstevel@tonic-gate "(%lu bytes), will hang forever", bytes); 23337c478bd9Sstevel@tonic-gate for (;;) 23347c478bd9Sstevel@tonic-gate delay(1000000000); 23357c478bd9Sstevel@tonic-gate } 23367c478bd9Sstevel@tonic-gate } 23377c478bd9Sstevel@tonic-gate 23387c478bd9Sstevel@tonic-gate if (!kcage_on || panicstr) { 23397c478bd9Sstevel@tonic-gate /* 23407c478bd9Sstevel@tonic-gate * Cage is OFF, or we are single threaded in 23417c478bd9Sstevel@tonic-gate * panic, so make everything a RELOC request. 23427c478bd9Sstevel@tonic-gate */ 23437c478bd9Sstevel@tonic-gate flags &= ~PG_NORELOC; 23447c478bd9Sstevel@tonic-gate } 23457c478bd9Sstevel@tonic-gate 23467c478bd9Sstevel@tonic-gate if (freemem <= throttlefree + npages) 23477c478bd9Sstevel@tonic-gate if (!page_create_throttle(npages, flags)) 23487c478bd9Sstevel@tonic-gate return (NULL); 23497c478bd9Sstevel@tonic-gate 23507c478bd9Sstevel@tonic-gate /* 23517c478bd9Sstevel@tonic-gate * If cage is on, dampen draw from cage when available 23527c478bd9Sstevel@tonic-gate * cage space is low. 23537c478bd9Sstevel@tonic-gate */ 23547c478bd9Sstevel@tonic-gate if ((flags & PG_NORELOC) && 23557c478bd9Sstevel@tonic-gate kcage_freemem < kcage_throttlefree + npages) { 23567c478bd9Sstevel@tonic-gate 23577c478bd9Sstevel@tonic-gate /* 23587c478bd9Sstevel@tonic-gate * The cage is on, the caller wants PG_NORELOC 23597c478bd9Sstevel@tonic-gate * pages and available cage memory is very low. 23607c478bd9Sstevel@tonic-gate * Call kcage_create_throttle() to attempt to 23617c478bd9Sstevel@tonic-gate * control demand on the cage. 23627c478bd9Sstevel@tonic-gate */ 23637c478bd9Sstevel@tonic-gate if (kcage_create_throttle(npages, flags) == KCT_FAILURE) 23647c478bd9Sstevel@tonic-gate return (NULL); 23657c478bd9Sstevel@tonic-gate } 23667c478bd9Sstevel@tonic-gate 23677c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[0]); 23687c478bd9Sstevel@tonic-gate 23697c478bd9Sstevel@tonic-gate enough = 0; 23707c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 23717c478bd9Sstevel@tonic-gate 23727c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 23737c478bd9Sstevel@tonic-gate q = &pcf[PCF_FANOUT]; 23747c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 23757c478bd9Sstevel@tonic-gate if (p->pcf_count > npages) { 23767c478bd9Sstevel@tonic-gate /* 23777c478bd9Sstevel@tonic-gate * a good one to try. 23787c478bd9Sstevel@tonic-gate */ 23797c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 23807c478bd9Sstevel@tonic-gate if (p->pcf_count > npages) { 23817c478bd9Sstevel@tonic-gate p->pcf_count -= (uint_t)npages; 23827c478bd9Sstevel@tonic-gate /* 23837c478bd9Sstevel@tonic-gate * freemem is not protected by any lock. 23847c478bd9Sstevel@tonic-gate * Thus, we cannot have any assertion 23857c478bd9Sstevel@tonic-gate * containing freemem here. 23867c478bd9Sstevel@tonic-gate */ 23877c478bd9Sstevel@tonic-gate freemem -= npages; 23887c478bd9Sstevel@tonic-gate enough = 1; 23897c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 23907c478bd9Sstevel@tonic-gate break; 23917c478bd9Sstevel@tonic-gate } 23927c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 23937c478bd9Sstevel@tonic-gate } 23947c478bd9Sstevel@tonic-gate p++; 23957c478bd9Sstevel@tonic-gate if (p >= q) { 23967c478bd9Sstevel@tonic-gate p = pcf; 23977c478bd9Sstevel@tonic-gate } 23987c478bd9Sstevel@tonic-gate } 23997c478bd9Sstevel@tonic-gate 24007c478bd9Sstevel@tonic-gate if (!enough) { 24017c478bd9Sstevel@tonic-gate /* 24027c478bd9Sstevel@tonic-gate * Have to look harder. If npages is greater than 24037c478bd9Sstevel@tonic-gate * one, then we might have to coalecse the counters. 24047c478bd9Sstevel@tonic-gate * 24057c478bd9Sstevel@tonic-gate * Go wait. We come back having accounted 24067c478bd9Sstevel@tonic-gate * for the memory. 24077c478bd9Sstevel@tonic-gate */ 24087c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[1]); 24097c478bd9Sstevel@tonic-gate if (!page_create_wait(npages, flags)) { 24107c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[2]); 24117c478bd9Sstevel@tonic-gate return (NULL); 24127c478bd9Sstevel@tonic-gate } 24137c478bd9Sstevel@tonic-gate } 24147c478bd9Sstevel@tonic-gate 24157c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_CREATE_SUCCESS, 24167c478bd9Sstevel@tonic-gate "page_create_success:vp %p off %llx", vp, off); 24177c478bd9Sstevel@tonic-gate 24187c478bd9Sstevel@tonic-gate /* 24197c478bd9Sstevel@tonic-gate * If satisfying this request has left us with too little 24207c478bd9Sstevel@tonic-gate * memory, start the wheels turning to get some back. The 24217c478bd9Sstevel@tonic-gate * first clause of the test prevents waking up the pageout 24227c478bd9Sstevel@tonic-gate * daemon in situations where it would decide that there's 24237c478bd9Sstevel@tonic-gate * nothing to do. 24247c478bd9Sstevel@tonic-gate */ 24257c478bd9Sstevel@tonic-gate if (nscan < desscan && freemem < minfree) { 24267c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGEOUT_CV_SIGNAL, 24277c478bd9Sstevel@tonic-gate "pageout_cv_signal:freemem %ld", freemem); 24287c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 24297c478bd9Sstevel@tonic-gate } 24307c478bd9Sstevel@tonic-gate 24317c478bd9Sstevel@tonic-gate /* 24327c478bd9Sstevel@tonic-gate * Loop around collecting the requested number of pages. 24337c478bd9Sstevel@tonic-gate * Most of the time, we have to `create' a new page. With 24347c478bd9Sstevel@tonic-gate * this in mind, pull the page off the free list before 24357c478bd9Sstevel@tonic-gate * getting the hash lock. This will minimize the hash 24367c478bd9Sstevel@tonic-gate * lock hold time, nesting, and the like. If it turns 24377c478bd9Sstevel@tonic-gate * out we don't need the page, we put it back at the end. 24387c478bd9Sstevel@tonic-gate */ 24397c478bd9Sstevel@tonic-gate while (npages--) { 24407c478bd9Sstevel@tonic-gate page_t *pp; 24417c478bd9Sstevel@tonic-gate kmutex_t *phm = NULL; 24427c478bd9Sstevel@tonic-gate ulong_t index; 24437c478bd9Sstevel@tonic-gate 24447c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 24457c478bd9Sstevel@tonic-gate top: 24467c478bd9Sstevel@tonic-gate ASSERT(phm == NULL); 24477c478bd9Sstevel@tonic-gate ASSERT(index == PAGE_HASH_FUNC(vp, off)); 24487c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 24497c478bd9Sstevel@tonic-gate 24507c478bd9Sstevel@tonic-gate if (npp == NULL) { 24517c478bd9Sstevel@tonic-gate /* 24527c478bd9Sstevel@tonic-gate * Try to get a page from the freelist (ie, 24537c478bd9Sstevel@tonic-gate * a page with no [vp, off] tag). If that 24547c478bd9Sstevel@tonic-gate * fails, use the cachelist. 24557c478bd9Sstevel@tonic-gate * 24567c478bd9Sstevel@tonic-gate * During the first attempt at both the free 24577c478bd9Sstevel@tonic-gate * and cache lists we try for the correct color. 24587c478bd9Sstevel@tonic-gate */ 24597c478bd9Sstevel@tonic-gate /* 24607c478bd9Sstevel@tonic-gate * XXXX-how do we deal with virtual indexed 24617c478bd9Sstevel@tonic-gate * caches and and colors? 24627c478bd9Sstevel@tonic-gate */ 24637c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_cnt[4]); 24647c478bd9Sstevel@tonic-gate /* 24657c478bd9Sstevel@tonic-gate * Get lgroup to allocate next page of shared memory 24667c478bd9Sstevel@tonic-gate * from and use it to specify where to allocate 24677c478bd9Sstevel@tonic-gate * the physical memory 24687c478bd9Sstevel@tonic-gate */ 24697c478bd9Sstevel@tonic-gate lgrp = lgrp_mem_choose(seg, vaddr, PAGESIZE); 24707c478bd9Sstevel@tonic-gate npp = page_get_freelist(vp, off, seg, vaddr, PAGESIZE, 24717c478bd9Sstevel@tonic-gate flags | PG_MATCH_COLOR, lgrp); 24727c478bd9Sstevel@tonic-gate if (npp == NULL) { 24737c478bd9Sstevel@tonic-gate npp = page_get_cachelist(vp, off, seg, 24747c478bd9Sstevel@tonic-gate vaddr, flags | PG_MATCH_COLOR, lgrp); 24757c478bd9Sstevel@tonic-gate if (npp == NULL) { 24767c478bd9Sstevel@tonic-gate npp = page_create_get_something(vp, 24777c478bd9Sstevel@tonic-gate off, seg, vaddr, 24787c478bd9Sstevel@tonic-gate flags & ~PG_MATCH_COLOR); 24797c478bd9Sstevel@tonic-gate } 24807c478bd9Sstevel@tonic-gate 24817c478bd9Sstevel@tonic-gate if (PP_ISAGED(npp) == 0) { 24827c478bd9Sstevel@tonic-gate /* 24837c478bd9Sstevel@tonic-gate * Since this page came from the 24847c478bd9Sstevel@tonic-gate * cachelist, we must destroy the 24857c478bd9Sstevel@tonic-gate * old vnode association. 24867c478bd9Sstevel@tonic-gate */ 24877c478bd9Sstevel@tonic-gate page_hashout(npp, NULL); 24887c478bd9Sstevel@tonic-gate } 24897c478bd9Sstevel@tonic-gate } 24907c478bd9Sstevel@tonic-gate } 24917c478bd9Sstevel@tonic-gate 24927c478bd9Sstevel@tonic-gate /* 24937c478bd9Sstevel@tonic-gate * We own this page! 24947c478bd9Sstevel@tonic-gate */ 24957c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(npp)); 24967c478bd9Sstevel@tonic-gate ASSERT(npp->p_vnode == NULL); 24977c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(npp)); 24987c478bd9Sstevel@tonic-gate PP_CLRFREE(npp); 24997c478bd9Sstevel@tonic-gate PP_CLRAGED(npp); 25007c478bd9Sstevel@tonic-gate 25017c478bd9Sstevel@tonic-gate /* 25027c478bd9Sstevel@tonic-gate * Here we have a page in our hot little mits and are 25037c478bd9Sstevel@tonic-gate * just waiting to stuff it on the appropriate lists. 25047c478bd9Sstevel@tonic-gate * Get the mutex and check to see if it really does 25057c478bd9Sstevel@tonic-gate * not exist. 25067c478bd9Sstevel@tonic-gate */ 25077c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 25087c478bd9Sstevel@tonic-gate mutex_enter(phm); 25097c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 25107c478bd9Sstevel@tonic-gate if (pp == NULL) { 25117c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_new); 25127c478bd9Sstevel@tonic-gate pp = npp; 25137c478bd9Sstevel@tonic-gate npp = NULL; 25147c478bd9Sstevel@tonic-gate if (!page_hashin(pp, vp, off, phm)) { 25157c478bd9Sstevel@tonic-gate /* 25167c478bd9Sstevel@tonic-gate * Since we hold the page hash mutex and 25177c478bd9Sstevel@tonic-gate * just searched for this page, page_hashin 25187c478bd9Sstevel@tonic-gate * had better not fail. If it does, that 25197c478bd9Sstevel@tonic-gate * means somethread did not follow the 25207c478bd9Sstevel@tonic-gate * page hash mutex rules. Panic now and 25217c478bd9Sstevel@tonic-gate * get it over with. As usual, go down 25227c478bd9Sstevel@tonic-gate * holding all the locks. 25237c478bd9Sstevel@tonic-gate */ 25247c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 25257c478bd9Sstevel@tonic-gate panic("page_create: " 25267c478bd9Sstevel@tonic-gate "hashin failed %p %p %llx %p", 25277c478bd9Sstevel@tonic-gate (void *)pp, (void *)vp, off, (void *)phm); 25287c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 25297c478bd9Sstevel@tonic-gate } 25307c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 25317c478bd9Sstevel@tonic-gate mutex_exit(phm); 25327c478bd9Sstevel@tonic-gate phm = NULL; 25337c478bd9Sstevel@tonic-gate 25347c478bd9Sstevel@tonic-gate /* 25357c478bd9Sstevel@tonic-gate * Hat layer locking need not be done to set 25367c478bd9Sstevel@tonic-gate * the following bits since the page is not hashed 25377c478bd9Sstevel@tonic-gate * and was on the free list (i.e., had no mappings). 25387c478bd9Sstevel@tonic-gate * 25397c478bd9Sstevel@tonic-gate * Set the reference bit to protect 25407c478bd9Sstevel@tonic-gate * against immediate pageout 25417c478bd9Sstevel@tonic-gate * 25427c478bd9Sstevel@tonic-gate * XXXmh modify freelist code to set reference 25437c478bd9Sstevel@tonic-gate * bit so we don't have to do it here. 25447c478bd9Sstevel@tonic-gate */ 25457c478bd9Sstevel@tonic-gate page_set_props(pp, P_REF); 25467c478bd9Sstevel@tonic-gate found_on_free++; 25477c478bd9Sstevel@tonic-gate } else { 25487c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_exists); 25497c478bd9Sstevel@tonic-gate if (flags & PG_EXCL) { 25507c478bd9Sstevel@tonic-gate /* 25517c478bd9Sstevel@tonic-gate * Found an existing page, and the caller 25527c478bd9Sstevel@tonic-gate * wanted all new pages. Undo all of the work 25537c478bd9Sstevel@tonic-gate * we have done. 25547c478bd9Sstevel@tonic-gate */ 25557c478bd9Sstevel@tonic-gate mutex_exit(phm); 25567c478bd9Sstevel@tonic-gate phm = NULL; 25577c478bd9Sstevel@tonic-gate while (plist != NULL) { 25587c478bd9Sstevel@tonic-gate pp = plist; 25597c478bd9Sstevel@tonic-gate page_sub(&plist, pp); 25607c478bd9Sstevel@tonic-gate page_io_unlock(pp); 25617c478bd9Sstevel@tonic-gate /* large pages should not end up here */ 25627c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 25637c478bd9Sstevel@tonic-gate /*LINTED: constant in conditional ctx*/ 25647c478bd9Sstevel@tonic-gate VN_DISPOSE(pp, B_INVAL, 0, kcred); 25657c478bd9Sstevel@tonic-gate } 25667c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_found_one); 25677c478bd9Sstevel@tonic-gate goto fail; 25687c478bd9Sstevel@tonic-gate } 25697c478bd9Sstevel@tonic-gate ASSERT(flags & PG_WAIT); 25707c478bd9Sstevel@tonic-gate if (!page_lock(pp, SE_EXCL, phm, P_NO_RECLAIM)) { 25717c478bd9Sstevel@tonic-gate /* 25727c478bd9Sstevel@tonic-gate * Start all over again if we blocked trying 25737c478bd9Sstevel@tonic-gate * to lock the page. 25747c478bd9Sstevel@tonic-gate */ 25757c478bd9Sstevel@tonic-gate mutex_exit(phm); 25767c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_page_lock_failed); 25777c478bd9Sstevel@tonic-gate phm = NULL; 25787c478bd9Sstevel@tonic-gate goto top; 25797c478bd9Sstevel@tonic-gate } 25807c478bd9Sstevel@tonic-gate mutex_exit(phm); 25817c478bd9Sstevel@tonic-gate phm = NULL; 25827c478bd9Sstevel@tonic-gate 25837c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 25847c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp) == 0); 25857c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_get_cache); 25867c478bd9Sstevel@tonic-gate page_list_sub(pp, PG_CACHE_LIST); 25877c478bd9Sstevel@tonic-gate PP_CLRFREE(pp); 25887c478bd9Sstevel@tonic-gate found_on_free++; 25897c478bd9Sstevel@tonic-gate } 25907c478bd9Sstevel@tonic-gate } 25917c478bd9Sstevel@tonic-gate 25927c478bd9Sstevel@tonic-gate /* 25937c478bd9Sstevel@tonic-gate * Got a page! It is locked. Acquire the i/o 25947c478bd9Sstevel@tonic-gate * lock since we are going to use the p_next and 25957c478bd9Sstevel@tonic-gate * p_prev fields to link the requested pages together. 25967c478bd9Sstevel@tonic-gate */ 25977c478bd9Sstevel@tonic-gate page_io_lock(pp); 25987c478bd9Sstevel@tonic-gate page_add(&plist, pp); 25997c478bd9Sstevel@tonic-gate plist = plist->p_next; 26007c478bd9Sstevel@tonic-gate off += PAGESIZE; 26017c478bd9Sstevel@tonic-gate vaddr += PAGESIZE; 26027c478bd9Sstevel@tonic-gate } 26037c478bd9Sstevel@tonic-gate 26047c478bd9Sstevel@tonic-gate ASSERT((flags & PG_EXCL) ? (found_on_free == pages_req) : 1); 26057c478bd9Sstevel@tonic-gate fail: 26067c478bd9Sstevel@tonic-gate if (npp != NULL) { 26077c478bd9Sstevel@tonic-gate /* 26087c478bd9Sstevel@tonic-gate * Did not need this page after all. 26097c478bd9Sstevel@tonic-gate * Put it back on the free list. 26107c478bd9Sstevel@tonic-gate */ 26117c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_putbacks); 26127c478bd9Sstevel@tonic-gate PP_SETFREE(npp); 26137c478bd9Sstevel@tonic-gate PP_SETAGED(npp); 26147c478bd9Sstevel@tonic-gate npp->p_offset = (u_offset_t)-1; 26157c478bd9Sstevel@tonic-gate page_list_add(npp, PG_FREE_LIST | PG_LIST_TAIL); 26167c478bd9Sstevel@tonic-gate page_unlock(npp); 26177c478bd9Sstevel@tonic-gate 26187c478bd9Sstevel@tonic-gate } 26197c478bd9Sstevel@tonic-gate 26207c478bd9Sstevel@tonic-gate ASSERT(pages_req >= found_on_free); 26217c478bd9Sstevel@tonic-gate 26227c478bd9Sstevel@tonic-gate { 26237c478bd9Sstevel@tonic-gate uint_t overshoot = (uint_t)(pages_req - found_on_free); 26247c478bd9Sstevel@tonic-gate 26257c478bd9Sstevel@tonic-gate if (overshoot) { 26267c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_create_overshoot); 26277c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 26287c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 26297c478bd9Sstevel@tonic-gate if (p->pcf_block) { 26307c478bd9Sstevel@tonic-gate p->pcf_reserve += overshoot; 26317c478bd9Sstevel@tonic-gate } else { 26327c478bd9Sstevel@tonic-gate p->pcf_count += overshoot; 26337c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 26347c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 26357c478bd9Sstevel@tonic-gate if (freemem_wait) { 26367c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 26377c478bd9Sstevel@tonic-gate p->pcf_wait--; 26387c478bd9Sstevel@tonic-gate } else { 26397c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 26407c478bd9Sstevel@tonic-gate } 26417c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 26427c478bd9Sstevel@tonic-gate } 26437c478bd9Sstevel@tonic-gate } 26447c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 26457c478bd9Sstevel@tonic-gate /* freemem is approximate, so this test OK */ 26467c478bd9Sstevel@tonic-gate if (!p->pcf_block) 26477c478bd9Sstevel@tonic-gate freemem += overshoot; 26487c478bd9Sstevel@tonic-gate } 26497c478bd9Sstevel@tonic-gate } 26507c478bd9Sstevel@tonic-gate 26517c478bd9Sstevel@tonic-gate return (plist); 26527c478bd9Sstevel@tonic-gate } 26537c478bd9Sstevel@tonic-gate 26547c478bd9Sstevel@tonic-gate /* 26557c478bd9Sstevel@tonic-gate * One or more constituent pages of this large page has been marked 26567c478bd9Sstevel@tonic-gate * toxic. Simply demote the large page to PAGESIZE pages and let 26577c478bd9Sstevel@tonic-gate * page_free() handle it. This routine should only be called by 26587c478bd9Sstevel@tonic-gate * large page free routines (page_free_pages() and page_destroy_pages(). 26597c478bd9Sstevel@tonic-gate * All pages are locked SE_EXCL and have already been marked free. 26607c478bd9Sstevel@tonic-gate */ 26617c478bd9Sstevel@tonic-gate static void 26627c478bd9Sstevel@tonic-gate page_free_toxic_pages(page_t *rootpp) 26637c478bd9Sstevel@tonic-gate { 26647c478bd9Sstevel@tonic-gate page_t *tpp; 26657c478bd9Sstevel@tonic-gate pgcnt_t i, pgcnt = page_get_pagecnt(rootpp->p_szc); 26667c478bd9Sstevel@tonic-gate uint_t szc = rootpp->p_szc; 26677c478bd9Sstevel@tonic-gate 26687c478bd9Sstevel@tonic-gate for (i = 0, tpp = rootpp; i < pgcnt; i++, tpp = tpp->p_next) { 26697c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 26707c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(tpp) && 26717c478bd9Sstevel@tonic-gate !page_iolock_assert(tpp)) || panicstr); 26727c478bd9Sstevel@tonic-gate tpp->p_szc = 0; 26737c478bd9Sstevel@tonic-gate } 26747c478bd9Sstevel@tonic-gate 26757c478bd9Sstevel@tonic-gate while (rootpp != NULL) { 26767c478bd9Sstevel@tonic-gate tpp = rootpp; 26777c478bd9Sstevel@tonic-gate page_sub(&rootpp, tpp); 26787c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(tpp)); 26797c478bd9Sstevel@tonic-gate PP_CLRFREE(tpp); 26807c478bd9Sstevel@tonic-gate page_free(tpp, 1); 26817c478bd9Sstevel@tonic-gate } 26827c478bd9Sstevel@tonic-gate } 26837c478bd9Sstevel@tonic-gate 26847c478bd9Sstevel@tonic-gate /* 26857c478bd9Sstevel@tonic-gate * Put page on the "free" list. 26867c478bd9Sstevel@tonic-gate * The free list is really two lists maintained by 26877c478bd9Sstevel@tonic-gate * the PSM of whatever machine we happen to be on. 26887c478bd9Sstevel@tonic-gate */ 26897c478bd9Sstevel@tonic-gate void 26907c478bd9Sstevel@tonic-gate page_free(page_t *pp, int dontneed) 26917c478bd9Sstevel@tonic-gate { 26927c478bd9Sstevel@tonic-gate struct pcf *p; 26937c478bd9Sstevel@tonic-gate uint_t pcf_index; 26947c478bd9Sstevel@tonic-gate 26957c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(pp) && 26967c478bd9Sstevel@tonic-gate !page_iolock_assert(pp)) || panicstr); 26977c478bd9Sstevel@tonic-gate 26987c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 26997c478bd9Sstevel@tonic-gate panic("page_free: page %p is free", (void *)pp); 27007c478bd9Sstevel@tonic-gate } 27017c478bd9Sstevel@tonic-gate 27027c478bd9Sstevel@tonic-gate if (pp->p_szc != 0) { 27037c478bd9Sstevel@tonic-gate if (pp->p_vnode == NULL || IS_SWAPFSVP(pp->p_vnode) || 27047c478bd9Sstevel@tonic-gate pp->p_vnode == &kvp) { 27057c478bd9Sstevel@tonic-gate panic("page_free: anon or kernel " 27067c478bd9Sstevel@tonic-gate "or no vnode large page %p", (void *)pp); 27077c478bd9Sstevel@tonic-gate } 27087c478bd9Sstevel@tonic-gate page_demote_vp_pages(pp); 27097c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 27107c478bd9Sstevel@tonic-gate } 27117c478bd9Sstevel@tonic-gate 27127c478bd9Sstevel@tonic-gate /* 27137c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired to examine these 27147c478bd9Sstevel@tonic-gate * fields since the page has an "exclusive" lock. 27157c478bd9Sstevel@tonic-gate */ 271607b65a64Saguzovsk if (hat_page_is_mapped(pp) || pp->p_lckcnt != 0 || pp->p_cowcnt != 0 || 271707b65a64Saguzovsk pp->p_slckcnt != 0) { 271807b65a64Saguzovsk panic("page_free pp=%p, pfn=%lx, lckcnt=%d, cowcnt=%d " 271907b65a64Saguzovsk "slckcnt = %d", pp, page_pptonum(pp), pp->p_lckcnt, 272007b65a64Saguzovsk pp->p_cowcnt, pp->p_slckcnt); 27217c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 27227c478bd9Sstevel@tonic-gate } 27237c478bd9Sstevel@tonic-gate 27247c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(pp)); 27257c478bd9Sstevel@tonic-gate 27267c478bd9Sstevel@tonic-gate PP_SETFREE(pp); 27277c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == NULL || !IS_VMODSORT(pp->p_vnode) || 27287c478bd9Sstevel@tonic-gate !hat_ismod(pp)); 27297c478bd9Sstevel@tonic-gate page_clr_all_props(pp); 27307c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(pp)); 27317c478bd9Sstevel@tonic-gate 27327c478bd9Sstevel@tonic-gate /* 27337c478bd9Sstevel@tonic-gate * Now we add the page to the head of the free list. 27347c478bd9Sstevel@tonic-gate * But if this page is associated with a paged vnode 27357c478bd9Sstevel@tonic-gate * then we adjust the head forward so that the page is 27367c478bd9Sstevel@tonic-gate * effectively at the end of the list. 27377c478bd9Sstevel@tonic-gate */ 27387c478bd9Sstevel@tonic-gate if (pp->p_vnode == NULL) { 27397c478bd9Sstevel@tonic-gate /* 27407c478bd9Sstevel@tonic-gate * Page has no identity, put it on the free list. 27417c478bd9Sstevel@tonic-gate */ 27427c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 27437c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)-1; 27447c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); 27457c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_free); 27467c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_FREE, 27477c478bd9Sstevel@tonic-gate "page_free_free:pp %p", pp); 27487c478bd9Sstevel@tonic-gate } else { 27497c478bd9Sstevel@tonic-gate PP_CLRAGED(pp); 27507c478bd9Sstevel@tonic-gate 27517c478bd9Sstevel@tonic-gate if (!dontneed || nopageage) { 27527c478bd9Sstevel@tonic-gate /* move it to the tail of the list */ 27537c478bd9Sstevel@tonic-gate page_list_add(pp, PG_CACHE_LIST | PG_LIST_TAIL); 27547c478bd9Sstevel@tonic-gate 27557c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_cache); 27567c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_CACHE_TAIL, 27577c478bd9Sstevel@tonic-gate "page_free_cache_tail:pp %p", pp); 27587c478bd9Sstevel@tonic-gate } else { 27597c478bd9Sstevel@tonic-gate page_list_add(pp, PG_CACHE_LIST | PG_LIST_HEAD); 27607c478bd9Sstevel@tonic-gate 27617c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_dontneed); 27627c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_CACHE_HEAD, 27637c478bd9Sstevel@tonic-gate "page_free_cache_head:pp %p", pp); 27647c478bd9Sstevel@tonic-gate } 27657c478bd9Sstevel@tonic-gate } 27667c478bd9Sstevel@tonic-gate page_unlock(pp); 27677c478bd9Sstevel@tonic-gate 27687c478bd9Sstevel@tonic-gate /* 27697c478bd9Sstevel@tonic-gate * Now do the `freemem' accounting. 27707c478bd9Sstevel@tonic-gate */ 27717c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 27727c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 27737c478bd9Sstevel@tonic-gate 27747c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 27757c478bd9Sstevel@tonic-gate if (p->pcf_block) { 27767c478bd9Sstevel@tonic-gate p->pcf_reserve += 1; 27777c478bd9Sstevel@tonic-gate } else { 27787c478bd9Sstevel@tonic-gate p->pcf_count += 1; 27797c478bd9Sstevel@tonic-gate if (p->pcf_wait) { 27807c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 27817c478bd9Sstevel@tonic-gate /* 27827c478bd9Sstevel@tonic-gate * Check to see if some other thread 27837c478bd9Sstevel@tonic-gate * is actually waiting. Another bucket 27847c478bd9Sstevel@tonic-gate * may have woken it up by now. If there 27857c478bd9Sstevel@tonic-gate * are no waiters, then set our pcf_wait 27867c478bd9Sstevel@tonic-gate * count to zero to avoid coming in here 27877c478bd9Sstevel@tonic-gate * next time. Also, since only one page 27887c478bd9Sstevel@tonic-gate * was put on the free list, just wake 27897c478bd9Sstevel@tonic-gate * up one waiter. 27907c478bd9Sstevel@tonic-gate */ 27917c478bd9Sstevel@tonic-gate if (freemem_wait) { 27927c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 27937c478bd9Sstevel@tonic-gate p->pcf_wait--; 27947c478bd9Sstevel@tonic-gate } else { 27957c478bd9Sstevel@tonic-gate p->pcf_wait = 0; 27967c478bd9Sstevel@tonic-gate } 27977c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 27987c478bd9Sstevel@tonic-gate } 27997c478bd9Sstevel@tonic-gate } 28007c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 28017c478bd9Sstevel@tonic-gate 28027c478bd9Sstevel@tonic-gate /* freemem is approximate, so this test OK */ 28037c478bd9Sstevel@tonic-gate if (!p->pcf_block) 28047c478bd9Sstevel@tonic-gate freemem += 1; 28057c478bd9Sstevel@tonic-gate } 28067c478bd9Sstevel@tonic-gate 28077c478bd9Sstevel@tonic-gate /* 28087c478bd9Sstevel@tonic-gate * Put page on the "free" list during intial startup. 28097c478bd9Sstevel@tonic-gate * This happens during initial single threaded execution. 28107c478bd9Sstevel@tonic-gate */ 28117c478bd9Sstevel@tonic-gate void 28127c478bd9Sstevel@tonic-gate page_free_at_startup(page_t *pp) 28137c478bd9Sstevel@tonic-gate { 28147c478bd9Sstevel@tonic-gate struct pcf *p; 28157c478bd9Sstevel@tonic-gate uint_t pcf_index; 28167c478bd9Sstevel@tonic-gate 28177c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_HEAD | PG_LIST_ISINIT); 28187c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_free); 28197c478bd9Sstevel@tonic-gate 28207c478bd9Sstevel@tonic-gate /* 28217c478bd9Sstevel@tonic-gate * Now do the `freemem' accounting. 28227c478bd9Sstevel@tonic-gate */ 28237c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 28247c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 28257c478bd9Sstevel@tonic-gate 28267c478bd9Sstevel@tonic-gate ASSERT(p->pcf_block == 0); 28277c478bd9Sstevel@tonic-gate ASSERT(p->pcf_wait == 0); 28287c478bd9Sstevel@tonic-gate p->pcf_count += 1; 28297c478bd9Sstevel@tonic-gate 28307c478bd9Sstevel@tonic-gate /* freemem is approximate, so this is OK */ 28317c478bd9Sstevel@tonic-gate freemem += 1; 28327c478bd9Sstevel@tonic-gate } 28337c478bd9Sstevel@tonic-gate 28347c478bd9Sstevel@tonic-gate void 28357c478bd9Sstevel@tonic-gate page_free_pages(page_t *pp) 28367c478bd9Sstevel@tonic-gate { 28377c478bd9Sstevel@tonic-gate page_t *tpp, *rootpp = NULL; 28387c478bd9Sstevel@tonic-gate pgcnt_t pgcnt = page_get_pagecnt(pp->p_szc); 28397c478bd9Sstevel@tonic-gate pgcnt_t i; 28407c478bd9Sstevel@tonic-gate uint_t szc = pp->p_szc; 28417c478bd9Sstevel@tonic-gate 28427c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_pages); 28437c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_FREE_FREE, 28447c478bd9Sstevel@tonic-gate "page_free_free:pp %p", pp); 28457c478bd9Sstevel@tonic-gate 28467c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc != 0 && pp->p_szc < page_num_pagesizes()); 28477c478bd9Sstevel@tonic-gate if ((page_pptonum(pp) & (pgcnt - 1)) != 0) { 28487c478bd9Sstevel@tonic-gate panic("page_free_pages: not root page %p", (void *)pp); 28497c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 28507c478bd9Sstevel@tonic-gate } 28517c478bd9Sstevel@tonic-gate 2852affbd3ccSkchow for (i = 0, tpp = pp; i < pgcnt; i++, tpp++) { 28537c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(tpp) && 28547c478bd9Sstevel@tonic-gate !page_iolock_assert(tpp)) || panicstr); 28557c478bd9Sstevel@tonic-gate if (PP_ISFREE(tpp)) { 28567c478bd9Sstevel@tonic-gate panic("page_free_pages: page %p is free", (void *)tpp); 28577c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 28587c478bd9Sstevel@tonic-gate } 28597c478bd9Sstevel@tonic-gate if (hat_page_is_mapped(tpp) || tpp->p_lckcnt != 0 || 286007b65a64Saguzovsk tpp->p_cowcnt != 0 || tpp->p_slckcnt != 0) { 28617c478bd9Sstevel@tonic-gate panic("page_free_pages %p", (void *)tpp); 28627c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 28637c478bd9Sstevel@tonic-gate } 28647c478bd9Sstevel@tonic-gate 28657c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(tpp)); 28667c478bd9Sstevel@tonic-gate ASSERT(tpp->p_vnode == NULL); 28677c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 28687c478bd9Sstevel@tonic-gate 28697c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 28707c478bd9Sstevel@tonic-gate page_clr_all_props(tpp); 28717c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 28727c478bd9Sstevel@tonic-gate tpp->p_offset = (u_offset_t)-1; 28737c478bd9Sstevel@tonic-gate ASSERT(tpp->p_next == tpp); 28747c478bd9Sstevel@tonic-gate ASSERT(tpp->p_prev == tpp); 28757c478bd9Sstevel@tonic-gate page_list_concat(&rootpp, &tpp); 28767c478bd9Sstevel@tonic-gate } 28777c478bd9Sstevel@tonic-gate ASSERT(rootpp == pp); 28787c478bd9Sstevel@tonic-gate 28797c478bd9Sstevel@tonic-gate page_list_add_pages(rootpp, 0); 28807c478bd9Sstevel@tonic-gate page_create_putback(pgcnt); 28817c478bd9Sstevel@tonic-gate } 28827c478bd9Sstevel@tonic-gate 28837c478bd9Sstevel@tonic-gate int free_pages = 1; 28847c478bd9Sstevel@tonic-gate 28857c478bd9Sstevel@tonic-gate /* 28867c478bd9Sstevel@tonic-gate * This routine attempts to return pages to the cachelist via page_release(). 28877c478bd9Sstevel@tonic-gate * It does not *have* to be successful in all cases, since the pageout scanner 28887c478bd9Sstevel@tonic-gate * will catch any pages it misses. It does need to be fast and not introduce 28897c478bd9Sstevel@tonic-gate * too much overhead. 28907c478bd9Sstevel@tonic-gate * 28917c478bd9Sstevel@tonic-gate * If a page isn't found on the unlocked sweep of the page_hash bucket, we 28927c478bd9Sstevel@tonic-gate * don't lock and retry. This is ok, since the page scanner will eventually 28937c478bd9Sstevel@tonic-gate * find any page we miss in free_vp_pages(). 28947c478bd9Sstevel@tonic-gate */ 28957c478bd9Sstevel@tonic-gate void 28967c478bd9Sstevel@tonic-gate free_vp_pages(vnode_t *vp, u_offset_t off, size_t len) 28977c478bd9Sstevel@tonic-gate { 28987c478bd9Sstevel@tonic-gate page_t *pp; 28997c478bd9Sstevel@tonic-gate u_offset_t eoff; 29007c478bd9Sstevel@tonic-gate extern int swap_in_range(vnode_t *, u_offset_t, size_t); 29017c478bd9Sstevel@tonic-gate 29027c478bd9Sstevel@tonic-gate eoff = off + len; 29037c478bd9Sstevel@tonic-gate 29047c478bd9Sstevel@tonic-gate if (free_pages == 0) 29057c478bd9Sstevel@tonic-gate return; 29067c478bd9Sstevel@tonic-gate if (swap_in_range(vp, off, len)) 29077c478bd9Sstevel@tonic-gate return; 29087c478bd9Sstevel@tonic-gate 29097c478bd9Sstevel@tonic-gate for (; off < eoff; off += PAGESIZE) { 29107c478bd9Sstevel@tonic-gate 29117c478bd9Sstevel@tonic-gate /* 29127c478bd9Sstevel@tonic-gate * find the page using a fast, but inexact search. It'll be OK 29137c478bd9Sstevel@tonic-gate * if a few pages slip through the cracks here. 29147c478bd9Sstevel@tonic-gate */ 29157c478bd9Sstevel@tonic-gate pp = page_exists(vp, off); 29167c478bd9Sstevel@tonic-gate 29177c478bd9Sstevel@tonic-gate /* 29187c478bd9Sstevel@tonic-gate * If we didn't find the page (it may not exist), the page 29197c478bd9Sstevel@tonic-gate * is free, looks still in use (shared), or we can't lock it, 29207c478bd9Sstevel@tonic-gate * just give up. 29217c478bd9Sstevel@tonic-gate */ 29227c478bd9Sstevel@tonic-gate if (pp == NULL || 29237c478bd9Sstevel@tonic-gate PP_ISFREE(pp) || 29247c478bd9Sstevel@tonic-gate page_share_cnt(pp) > 0 || 29257c478bd9Sstevel@tonic-gate !page_trylock(pp, SE_EXCL)) 29267c478bd9Sstevel@tonic-gate continue; 29277c478bd9Sstevel@tonic-gate 29287c478bd9Sstevel@tonic-gate /* 29297c478bd9Sstevel@tonic-gate * Once we have locked pp, verify that it's still the 29307c478bd9Sstevel@tonic-gate * correct page and not already free 29317c478bd9Sstevel@tonic-gate */ 29327c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED_SE(pp, SE_EXCL)); 29337c478bd9Sstevel@tonic-gate if (pp->p_vnode != vp || pp->p_offset != off || PP_ISFREE(pp)) { 29347c478bd9Sstevel@tonic-gate page_unlock(pp); 29357c478bd9Sstevel@tonic-gate continue; 29367c478bd9Sstevel@tonic-gate } 29377c478bd9Sstevel@tonic-gate 29387c478bd9Sstevel@tonic-gate /* 29397c478bd9Sstevel@tonic-gate * try to release the page... 29407c478bd9Sstevel@tonic-gate */ 29417c478bd9Sstevel@tonic-gate (void) page_release(pp, 1); 29427c478bd9Sstevel@tonic-gate } 29437c478bd9Sstevel@tonic-gate } 29447c478bd9Sstevel@tonic-gate 29457c478bd9Sstevel@tonic-gate /* 29467c478bd9Sstevel@tonic-gate * Reclaim the given page from the free list. 29477c478bd9Sstevel@tonic-gate * Returns 1 on success or 0 on failure. 29487c478bd9Sstevel@tonic-gate * 29497c478bd9Sstevel@tonic-gate * The page is unlocked if it can't be reclaimed (when freemem == 0). 29507c478bd9Sstevel@tonic-gate * If `lock' is non-null, it will be dropped and re-acquired if 29517c478bd9Sstevel@tonic-gate * the routine must wait while freemem is 0. 29527c478bd9Sstevel@tonic-gate * 29537c478bd9Sstevel@tonic-gate * As it turns out, boot_getpages() does this. It picks a page, 29547c478bd9Sstevel@tonic-gate * based on where OBP mapped in some address, gets its pfn, searches 29557c478bd9Sstevel@tonic-gate * the memsegs, locks the page, then pulls it off the free list! 29567c478bd9Sstevel@tonic-gate */ 29577c478bd9Sstevel@tonic-gate int 29587c478bd9Sstevel@tonic-gate page_reclaim(page_t *pp, kmutex_t *lock) 29597c478bd9Sstevel@tonic-gate { 29607c478bd9Sstevel@tonic-gate struct pcf *p; 29617c478bd9Sstevel@tonic-gate uint_t pcf_index; 29627c478bd9Sstevel@tonic-gate struct cpu *cpup; 29637c478bd9Sstevel@tonic-gate uint_t i; 2964de62167aSmec pgcnt_t npgs, need; 2965de62167aSmec pgcnt_t collected = 0; 29667c478bd9Sstevel@tonic-gate 29677c478bd9Sstevel@tonic-gate ASSERT(lock != NULL ? MUTEX_HELD(lock) : 1); 29687c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp) && PP_ISFREE(pp)); 2969db874c57Selowe 2970db874c57Selowe npgs = page_get_pagecnt(pp->p_szc); 29717c478bd9Sstevel@tonic-gate 29727c478bd9Sstevel@tonic-gate /* 29737c478bd9Sstevel@tonic-gate * If `freemem' is 0, we cannot reclaim this page from the 29747c478bd9Sstevel@tonic-gate * freelist, so release every lock we might hold: the page, 29757c478bd9Sstevel@tonic-gate * and the `lock' before blocking. 29767c478bd9Sstevel@tonic-gate * 29777c478bd9Sstevel@tonic-gate * The only way `freemem' can become 0 while there are pages 29787c478bd9Sstevel@tonic-gate * marked free (have their p->p_free bit set) is when the 29797c478bd9Sstevel@tonic-gate * system is low on memory and doing a page_create(). In 29807c478bd9Sstevel@tonic-gate * order to guarantee that once page_create() starts acquiring 29817c478bd9Sstevel@tonic-gate * pages it will be able to get all that it needs since `freemem' 29827c478bd9Sstevel@tonic-gate * was decreased by the requested amount. So, we need to release 29837c478bd9Sstevel@tonic-gate * this page, and let page_create() have it. 29847c478bd9Sstevel@tonic-gate * 29857c478bd9Sstevel@tonic-gate * Since `freemem' being zero is not supposed to happen, just 29867c478bd9Sstevel@tonic-gate * use the usual hash stuff as a starting point. If that bucket 29877c478bd9Sstevel@tonic-gate * is empty, then assume the worst, and start at the beginning 29887c478bd9Sstevel@tonic-gate * of the pcf array. If we always start at the beginning 29897c478bd9Sstevel@tonic-gate * when acquiring more than one pcf lock, there won't be any 29907c478bd9Sstevel@tonic-gate * deadlock problems. 29917c478bd9Sstevel@tonic-gate */ 29927c478bd9Sstevel@tonic-gate 29937c478bd9Sstevel@tonic-gate /* TODO: Do we need to test kcage_freemem if PG_NORELOC(pp)? */ 29947c478bd9Sstevel@tonic-gate 299524e9c58bSelowe if (freemem <= throttlefree && !page_create_throttle(npgs, 0)) { 29967c478bd9Sstevel@tonic-gate pcf_acquire_all(); 29977c478bd9Sstevel@tonic-gate goto page_reclaim_nomem; 29987c478bd9Sstevel@tonic-gate } 29997c478bd9Sstevel@tonic-gate 30007c478bd9Sstevel@tonic-gate pcf_index = PCF_INDEX(); 30017c478bd9Sstevel@tonic-gate p = &pcf[pcf_index]; 30027c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 3003db874c57Selowe if (p->pcf_count >= npgs) { 3004db874c57Selowe collected = npgs; 3005db874c57Selowe p->pcf_count -= npgs; 30067c478bd9Sstevel@tonic-gate } 30077c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 3008db874c57Selowe need = npgs - collected; 30097c478bd9Sstevel@tonic-gate 3010db874c57Selowe if (need > 0) { 30117c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_reclaim_zero); 30127c478bd9Sstevel@tonic-gate /* 30137c478bd9Sstevel@tonic-gate * Check again. Its possible that some other thread 30147c478bd9Sstevel@tonic-gate * could have been right behind us, and added one 30157c478bd9Sstevel@tonic-gate * to a list somewhere. Acquire each of the pcf locks 30167c478bd9Sstevel@tonic-gate * until we find a page. 30177c478bd9Sstevel@tonic-gate */ 30187c478bd9Sstevel@tonic-gate p = pcf; 30197c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 30207c478bd9Sstevel@tonic-gate mutex_enter(&p->pcf_lock); 3021db874c57Selowe if (p->pcf_count) { 3022db874c57Selowe if (p->pcf_count >= need) { 3023db874c57Selowe p->pcf_count -= need; 3024db874c57Selowe collected += need; 3025db874c57Selowe need = 0; 3026db874c57Selowe break; 3027db874c57Selowe } else if (p->pcf_count) { 3028db874c57Selowe collected += p->pcf_count; 3029db874c57Selowe need -= p->pcf_count; 3030db874c57Selowe p->pcf_count = 0; 3031db874c57Selowe } 30327c478bd9Sstevel@tonic-gate } 30337c478bd9Sstevel@tonic-gate p++; 30347c478bd9Sstevel@tonic-gate } 30357c478bd9Sstevel@tonic-gate 3036db874c57Selowe if (need > 0) { 30377c478bd9Sstevel@tonic-gate page_reclaim_nomem: 30387c478bd9Sstevel@tonic-gate /* 30397c478bd9Sstevel@tonic-gate * We really can't have page `pp'. 30407c478bd9Sstevel@tonic-gate * Time for the no-memory dance with 30417c478bd9Sstevel@tonic-gate * page_free(). This is just like 30427c478bd9Sstevel@tonic-gate * page_create_wait(). Plus the added 30437c478bd9Sstevel@tonic-gate * attraction of releasing whatever mutex 30447c478bd9Sstevel@tonic-gate * we held when we were called with in `lock'. 30457c478bd9Sstevel@tonic-gate * Page_unlock() will wakeup any thread 30467c478bd9Sstevel@tonic-gate * waiting around for this page. 30477c478bd9Sstevel@tonic-gate */ 30487c478bd9Sstevel@tonic-gate if (lock) { 30497c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_reclaim_zero_locked); 30507c478bd9Sstevel@tonic-gate mutex_exit(lock); 30517c478bd9Sstevel@tonic-gate } 30527c478bd9Sstevel@tonic-gate page_unlock(pp); 30537c478bd9Sstevel@tonic-gate 30547c478bd9Sstevel@tonic-gate /* 30557c478bd9Sstevel@tonic-gate * get this before we drop all the pcf locks. 30567c478bd9Sstevel@tonic-gate */ 30577c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 30587c478bd9Sstevel@tonic-gate 30597c478bd9Sstevel@tonic-gate p = pcf; 3060db874c57Selowe p->pcf_count += collected; 30617c478bd9Sstevel@tonic-gate for (i = 0; i < PCF_FANOUT; i++) { 30627c478bd9Sstevel@tonic-gate p->pcf_wait++; 30637c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 30647c478bd9Sstevel@tonic-gate p++; 30657c478bd9Sstevel@tonic-gate } 30667c478bd9Sstevel@tonic-gate 30677c478bd9Sstevel@tonic-gate freemem_wait++; 30687c478bd9Sstevel@tonic-gate cv_wait(&freemem_cv, &new_freemem_lock); 30697c478bd9Sstevel@tonic-gate freemem_wait--; 30707c478bd9Sstevel@tonic-gate 30717c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 30727c478bd9Sstevel@tonic-gate 30737c478bd9Sstevel@tonic-gate if (lock) { 30747c478bd9Sstevel@tonic-gate mutex_enter(lock); 30757c478bd9Sstevel@tonic-gate } 30767c478bd9Sstevel@tonic-gate return (0); 30777c478bd9Sstevel@tonic-gate } 30787c478bd9Sstevel@tonic-gate 30797c478bd9Sstevel@tonic-gate /* 3080db874c57Selowe * We beat the PCF bins over the head until 3081db874c57Selowe * we got the memory that we wanted. 30827c478bd9Sstevel@tonic-gate * The pcf accounting has been done, 30837c478bd9Sstevel@tonic-gate * though none of the pcf_wait flags have been set, 30847c478bd9Sstevel@tonic-gate * drop the locks and continue on. 30857c478bd9Sstevel@tonic-gate */ 3086db874c57Selowe ASSERT(collected == npgs); 30877c478bd9Sstevel@tonic-gate while (p >= pcf) { 30887c478bd9Sstevel@tonic-gate mutex_exit(&p->pcf_lock); 30897c478bd9Sstevel@tonic-gate p--; 30907c478bd9Sstevel@tonic-gate } 30917c478bd9Sstevel@tonic-gate } 30927c478bd9Sstevel@tonic-gate 30937c478bd9Sstevel@tonic-gate /* 30947c478bd9Sstevel@tonic-gate * freemem is not protected by any lock. Thus, we cannot 30957c478bd9Sstevel@tonic-gate * have any assertion containing freemem here. 30967c478bd9Sstevel@tonic-gate */ 3097db874c57Selowe freemem -= npgs; 30987c478bd9Sstevel@tonic-gate 30997c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_reclaim); 31007c478bd9Sstevel@tonic-gate if (PP_ISAGED(pp)) { 3101db874c57Selowe if (npgs > 1) { 3102db874c57Selowe page_list_sub_pages(pp, pp->p_szc); 3103db874c57Selowe } else { 3104db874c57Selowe page_list_sub(pp, PG_FREE_LIST); 3105db874c57Selowe } 31067c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_UNFREE_FREE, 31077c478bd9Sstevel@tonic-gate "page_reclaim_free:pp %p", pp); 31087c478bd9Sstevel@tonic-gate } else { 3109db874c57Selowe ASSERT(npgs == 1); 31107c478bd9Sstevel@tonic-gate page_list_sub(pp, PG_CACHE_LIST); 31117c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_UNFREE_CACHE, 31127c478bd9Sstevel@tonic-gate "page_reclaim_cache:pp %p", pp); 31137c478bd9Sstevel@tonic-gate } 31147c478bd9Sstevel@tonic-gate 31157c478bd9Sstevel@tonic-gate /* 31167c478bd9Sstevel@tonic-gate * clear the p_free & p_age bits since this page is no longer 31177c478bd9Sstevel@tonic-gate * on the free list. Notice that there was a brief time where 31187c478bd9Sstevel@tonic-gate * a page is marked as free, but is not on the list. 31197c478bd9Sstevel@tonic-gate * 31207c478bd9Sstevel@tonic-gate * Set the reference bit to protect against immediate pageout. 31217c478bd9Sstevel@tonic-gate */ 312224e9c58bSelowe for (i = 0; i < npgs; i++, pp++) { 3123db874c57Selowe PP_CLRFREE(pp); 3124db874c57Selowe PP_CLRAGED(pp); 3125db874c57Selowe page_set_props(pp, P_REF); 3126db874c57Selowe } 31277c478bd9Sstevel@tonic-gate 31287c478bd9Sstevel@tonic-gate CPU_STATS_ENTER_K(); 31297c478bd9Sstevel@tonic-gate cpup = CPU; /* get cpup now that CPU cannot change */ 31307c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cpup, vm, pgrec, 1); 31317c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cpup, vm, pgfrec, 1); 31327c478bd9Sstevel@tonic-gate CPU_STATS_EXIT_K(); 31337c478bd9Sstevel@tonic-gate 31347c478bd9Sstevel@tonic-gate return (1); 31357c478bd9Sstevel@tonic-gate } 31367c478bd9Sstevel@tonic-gate 31377c478bd9Sstevel@tonic-gate 31387c478bd9Sstevel@tonic-gate 31397c478bd9Sstevel@tonic-gate /* 31407c478bd9Sstevel@tonic-gate * Destroy identity of the page and put it back on 31417c478bd9Sstevel@tonic-gate * the page free list. Assumes that the caller has 31427c478bd9Sstevel@tonic-gate * acquired the "exclusive" lock on the page. 31437c478bd9Sstevel@tonic-gate */ 31447c478bd9Sstevel@tonic-gate void 31457c478bd9Sstevel@tonic-gate page_destroy(page_t *pp, int dontfree) 31467c478bd9Sstevel@tonic-gate { 31477c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(pp) && 31487c478bd9Sstevel@tonic-gate !page_iolock_assert(pp)) || panicstr); 314907b65a64Saguzovsk ASSERT(pp->p_slckcnt == 0 || panicstr); 31507c478bd9Sstevel@tonic-gate 31517c478bd9Sstevel@tonic-gate if (pp->p_szc != 0) { 31527c478bd9Sstevel@tonic-gate if (pp->p_vnode == NULL || IS_SWAPFSVP(pp->p_vnode) || 31537c478bd9Sstevel@tonic-gate pp->p_vnode == &kvp) { 31547c478bd9Sstevel@tonic-gate panic("page_destroy: anon or kernel or no vnode " 31557c478bd9Sstevel@tonic-gate "large page %p", (void *)pp); 31567c478bd9Sstevel@tonic-gate } 31577c478bd9Sstevel@tonic-gate page_demote_vp_pages(pp); 31587c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 31597c478bd9Sstevel@tonic-gate } 31607c478bd9Sstevel@tonic-gate 31617c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_DESTROY, "page_destroy:pp %p", pp); 31627c478bd9Sstevel@tonic-gate 31637c478bd9Sstevel@tonic-gate /* 31647c478bd9Sstevel@tonic-gate * Unload translations, if any, then hash out the 31657c478bd9Sstevel@tonic-gate * page to erase its identity. 31667c478bd9Sstevel@tonic-gate */ 31677c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 31687c478bd9Sstevel@tonic-gate page_hashout(pp, NULL); 31697c478bd9Sstevel@tonic-gate 31707c478bd9Sstevel@tonic-gate if (!dontfree) { 31717c478bd9Sstevel@tonic-gate /* 31727c478bd9Sstevel@tonic-gate * Acquire the "freemem_lock" for availrmem. 31737c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt 31747c478bd9Sstevel@tonic-gate * and cowcnt since the page has an "exclusive" lock. 31757c478bd9Sstevel@tonic-gate */ 31767c478bd9Sstevel@tonic-gate if ((pp->p_lckcnt != 0) || (pp->p_cowcnt != 0)) { 31777c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 31787c478bd9Sstevel@tonic-gate if (pp->p_lckcnt != 0) { 31797c478bd9Sstevel@tonic-gate availrmem++; 31807c478bd9Sstevel@tonic-gate pp->p_lckcnt = 0; 31817c478bd9Sstevel@tonic-gate } 31827c478bd9Sstevel@tonic-gate if (pp->p_cowcnt != 0) { 31837c478bd9Sstevel@tonic-gate availrmem += pp->p_cowcnt; 31847c478bd9Sstevel@tonic-gate pp->p_cowcnt = 0; 31857c478bd9Sstevel@tonic-gate } 31867c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 31877c478bd9Sstevel@tonic-gate } 31887c478bd9Sstevel@tonic-gate /* 31897c478bd9Sstevel@tonic-gate * Put the page on the "free" list. 31907c478bd9Sstevel@tonic-gate */ 31917c478bd9Sstevel@tonic-gate page_free(pp, 0); 31927c478bd9Sstevel@tonic-gate } 31937c478bd9Sstevel@tonic-gate } 31947c478bd9Sstevel@tonic-gate 31957c478bd9Sstevel@tonic-gate void 31967c478bd9Sstevel@tonic-gate page_destroy_pages(page_t *pp) 31977c478bd9Sstevel@tonic-gate { 31987c478bd9Sstevel@tonic-gate 31997c478bd9Sstevel@tonic-gate page_t *tpp, *rootpp = NULL; 32007c478bd9Sstevel@tonic-gate pgcnt_t pgcnt = page_get_pagecnt(pp->p_szc); 32017c478bd9Sstevel@tonic-gate pgcnt_t i, pglcks = 0; 32027c478bd9Sstevel@tonic-gate uint_t szc = pp->p_szc; 32037c478bd9Sstevel@tonic-gate 32047c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc != 0 && pp->p_szc < page_num_pagesizes()); 32057c478bd9Sstevel@tonic-gate 32067c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_destroy_pages); 32077c478bd9Sstevel@tonic-gate 32087c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_VM, TR_PAGE_DESTROY, "page_destroy_pages:pp %p", pp); 32097c478bd9Sstevel@tonic-gate 32107c478bd9Sstevel@tonic-gate if ((page_pptonum(pp) & (pgcnt - 1)) != 0) { 32117c478bd9Sstevel@tonic-gate panic("page_destroy_pages: not root page %p", (void *)pp); 32127c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 32137c478bd9Sstevel@tonic-gate } 32147c478bd9Sstevel@tonic-gate 3215affbd3ccSkchow for (i = 0, tpp = pp; i < pgcnt; i++, tpp++) { 32167c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(tpp) && 32177c478bd9Sstevel@tonic-gate !page_iolock_assert(tpp)) || panicstr); 321807b65a64Saguzovsk ASSERT(tpp->p_slckcnt == 0 || panicstr); 32197c478bd9Sstevel@tonic-gate (void) hat_pageunload(tpp, HAT_FORCE_PGUNLOAD); 32207c478bd9Sstevel@tonic-gate page_hashout(tpp, NULL); 32217c478bd9Sstevel@tonic-gate ASSERT(tpp->p_offset == (u_offset_t)-1); 32227c478bd9Sstevel@tonic-gate if (tpp->p_lckcnt != 0) { 32237c478bd9Sstevel@tonic-gate pglcks++; 32247c478bd9Sstevel@tonic-gate tpp->p_lckcnt = 0; 32257c478bd9Sstevel@tonic-gate } else if (tpp->p_cowcnt != 0) { 32267c478bd9Sstevel@tonic-gate pglcks += tpp->p_cowcnt; 32277c478bd9Sstevel@tonic-gate tpp->p_cowcnt = 0; 32287c478bd9Sstevel@tonic-gate } 32297c478bd9Sstevel@tonic-gate ASSERT(!hat_page_getshare(tpp)); 32307c478bd9Sstevel@tonic-gate ASSERT(tpp->p_vnode == NULL); 32317c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 32327c478bd9Sstevel@tonic-gate 32337c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 32347c478bd9Sstevel@tonic-gate page_clr_all_props(tpp); 32357c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 32367c478bd9Sstevel@tonic-gate ASSERT(tpp->p_next == tpp); 32377c478bd9Sstevel@tonic-gate ASSERT(tpp->p_prev == tpp); 32387c478bd9Sstevel@tonic-gate page_list_concat(&rootpp, &tpp); 32397c478bd9Sstevel@tonic-gate } 32407c478bd9Sstevel@tonic-gate 32417c478bd9Sstevel@tonic-gate ASSERT(rootpp == pp); 32427c478bd9Sstevel@tonic-gate if (pglcks != 0) { 32437c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 32447c478bd9Sstevel@tonic-gate availrmem += pglcks; 32457c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 32467c478bd9Sstevel@tonic-gate } 32477c478bd9Sstevel@tonic-gate 32487c478bd9Sstevel@tonic-gate page_list_add_pages(rootpp, 0); 32497c478bd9Sstevel@tonic-gate page_create_putback(pgcnt); 32507c478bd9Sstevel@tonic-gate } 32517c478bd9Sstevel@tonic-gate 32527c478bd9Sstevel@tonic-gate /* 32537c478bd9Sstevel@tonic-gate * Similar to page_destroy(), but destroys pages which are 32547c478bd9Sstevel@tonic-gate * locked and known to be on the page free list. Since 32557c478bd9Sstevel@tonic-gate * the page is known to be free and locked, no one can access 32567c478bd9Sstevel@tonic-gate * it. 32577c478bd9Sstevel@tonic-gate * 32587c478bd9Sstevel@tonic-gate * Also, the number of free pages does not change. 32597c478bd9Sstevel@tonic-gate */ 32607c478bd9Sstevel@tonic-gate void 32617c478bd9Sstevel@tonic-gate page_destroy_free(page_t *pp) 32627c478bd9Sstevel@tonic-gate { 32637c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 32647c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(pp)); 32657c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode); 32667c478bd9Sstevel@tonic-gate ASSERT(hat_page_getattr(pp, P_MOD | P_REF | P_RO) == 0); 32677c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 32687c478bd9Sstevel@tonic-gate ASSERT(PP_ISAGED(pp) == 0); 32697c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 32707c478bd9Sstevel@tonic-gate 32717c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_destroy_free); 32727c478bd9Sstevel@tonic-gate page_list_sub(pp, PG_CACHE_LIST); 32737c478bd9Sstevel@tonic-gate 32747c478bd9Sstevel@tonic-gate page_hashout(pp, NULL); 32757c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode == NULL); 32767c478bd9Sstevel@tonic-gate ASSERT(pp->p_offset == (u_offset_t)-1); 32777c478bd9Sstevel@tonic-gate ASSERT(pp->p_hash == NULL); 32787c478bd9Sstevel@tonic-gate 32797c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 32807c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); 32817c478bd9Sstevel@tonic-gate page_unlock(pp); 32827c478bd9Sstevel@tonic-gate 32837c478bd9Sstevel@tonic-gate mutex_enter(&new_freemem_lock); 32847c478bd9Sstevel@tonic-gate if (freemem_wait) { 32857c478bd9Sstevel@tonic-gate cv_signal(&freemem_cv); 32867c478bd9Sstevel@tonic-gate } 32877c478bd9Sstevel@tonic-gate mutex_exit(&new_freemem_lock); 32887c478bd9Sstevel@tonic-gate } 32897c478bd9Sstevel@tonic-gate 32907c478bd9Sstevel@tonic-gate /* 32917c478bd9Sstevel@tonic-gate * Rename the page "opp" to have an identity specified 32927c478bd9Sstevel@tonic-gate * by [vp, off]. If a page already exists with this name 32937c478bd9Sstevel@tonic-gate * it is locked and destroyed. Note that the page's 32947c478bd9Sstevel@tonic-gate * translations are not unloaded during the rename. 32957c478bd9Sstevel@tonic-gate * 32967c478bd9Sstevel@tonic-gate * This routine is used by the anon layer to "steal" the 32977c478bd9Sstevel@tonic-gate * original page and is not unlike destroying a page and 32987c478bd9Sstevel@tonic-gate * creating a new page using the same page frame. 32997c478bd9Sstevel@tonic-gate * 33007c478bd9Sstevel@tonic-gate * XXX -- Could deadlock if caller 1 tries to rename A to B while 33017c478bd9Sstevel@tonic-gate * caller 2 tries to rename B to A. 33027c478bd9Sstevel@tonic-gate */ 33037c478bd9Sstevel@tonic-gate void 33047c478bd9Sstevel@tonic-gate page_rename(page_t *opp, vnode_t *vp, u_offset_t off) 33057c478bd9Sstevel@tonic-gate { 33067c478bd9Sstevel@tonic-gate page_t *pp; 33077c478bd9Sstevel@tonic-gate int olckcnt = 0; 33087c478bd9Sstevel@tonic-gate int ocowcnt = 0; 33097c478bd9Sstevel@tonic-gate kmutex_t *phm; 33107c478bd9Sstevel@tonic-gate ulong_t index; 33117c478bd9Sstevel@tonic-gate 33127c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(opp) && !page_iolock_assert(opp)); 33137c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 33147c478bd9Sstevel@tonic-gate ASSERT(PP_ISFREE(opp) == 0); 33157c478bd9Sstevel@tonic-gate 33167c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_rename_count); 33177c478bd9Sstevel@tonic-gate 33187c478bd9Sstevel@tonic-gate TRACE_3(TR_FAC_VM, TR_PAGE_RENAME, 33197c478bd9Sstevel@tonic-gate "page rename:pp %p vp %p off %llx", opp, vp, off); 33207c478bd9Sstevel@tonic-gate 332137fbc076Saguzovsk /* 332237fbc076Saguzovsk * CacheFS may call page_rename for a large NFS page 332337fbc076Saguzovsk * when both CacheFS and NFS mount points are used 332437fbc076Saguzovsk * by applications. Demote this large page before 332537fbc076Saguzovsk * renaming it, to ensure that there are no "partial" 332637fbc076Saguzovsk * large pages left lying around. 332737fbc076Saguzovsk */ 332837fbc076Saguzovsk if (opp->p_szc != 0) { 332937fbc076Saguzovsk vnode_t *ovp = opp->p_vnode; 333037fbc076Saguzovsk ASSERT(ovp != NULL); 333137fbc076Saguzovsk ASSERT(!IS_SWAPFSVP(ovp)); 333237fbc076Saguzovsk ASSERT(ovp != &kvp); 333337fbc076Saguzovsk page_demote_vp_pages(opp); 333437fbc076Saguzovsk ASSERT(opp->p_szc == 0); 333537fbc076Saguzovsk } 333637fbc076Saguzovsk 33377c478bd9Sstevel@tonic-gate page_hashout(opp, NULL); 33387c478bd9Sstevel@tonic-gate PP_CLRAGED(opp); 33397c478bd9Sstevel@tonic-gate 33407c478bd9Sstevel@tonic-gate /* 33417c478bd9Sstevel@tonic-gate * Acquire the appropriate page hash lock, since 33427c478bd9Sstevel@tonic-gate * we're going to rename the page. 33437c478bd9Sstevel@tonic-gate */ 33447c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, off); 33457c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(index); 33467c478bd9Sstevel@tonic-gate mutex_enter(phm); 33477c478bd9Sstevel@tonic-gate top: 33487c478bd9Sstevel@tonic-gate /* 33497c478bd9Sstevel@tonic-gate * Look for an existing page with this name and destroy it if found. 33507c478bd9Sstevel@tonic-gate * By holding the page hash lock all the way to the page_hashin() 33517c478bd9Sstevel@tonic-gate * call, we are assured that no page can be created with this 33527c478bd9Sstevel@tonic-gate * identity. In the case when the phm lock is dropped to undo any 33537c478bd9Sstevel@tonic-gate * hat layer mappings, the existing page is held with an "exclusive" 33547c478bd9Sstevel@tonic-gate * lock, again preventing another page from being created with 33557c478bd9Sstevel@tonic-gate * this identity. 33567c478bd9Sstevel@tonic-gate */ 33577c478bd9Sstevel@tonic-gate PAGE_HASH_SEARCH(index, pp, vp, off); 33587c478bd9Sstevel@tonic-gate if (pp != NULL) { 33597c478bd9Sstevel@tonic-gate VM_STAT_ADD(page_rename_exists); 33607c478bd9Sstevel@tonic-gate 33617c478bd9Sstevel@tonic-gate /* 33627c478bd9Sstevel@tonic-gate * As it turns out, this is one of only two places where 33637c478bd9Sstevel@tonic-gate * page_lock() needs to hold the passed in lock in the 33647c478bd9Sstevel@tonic-gate * successful case. In all of the others, the lock could 33657c478bd9Sstevel@tonic-gate * be dropped as soon as the attempt is made to lock 33667c478bd9Sstevel@tonic-gate * the page. It is tempting to add yet another arguement, 33677c478bd9Sstevel@tonic-gate * PL_KEEP or PL_DROP, to let page_lock know what to do. 33687c478bd9Sstevel@tonic-gate */ 33697c478bd9Sstevel@tonic-gate if (!page_lock(pp, SE_EXCL, phm, P_RECLAIM)) { 33707c478bd9Sstevel@tonic-gate /* 33717c478bd9Sstevel@tonic-gate * Went to sleep because the page could not 33727c478bd9Sstevel@tonic-gate * be locked. We were woken up when the page 33737c478bd9Sstevel@tonic-gate * was unlocked, or when the page was destroyed. 33747c478bd9Sstevel@tonic-gate * In either case, `phm' was dropped while we 33757c478bd9Sstevel@tonic-gate * slept. Hence we should not just roar through 33767c478bd9Sstevel@tonic-gate * this loop. 33777c478bd9Sstevel@tonic-gate */ 33787c478bd9Sstevel@tonic-gate goto top; 33797c478bd9Sstevel@tonic-gate } 33807c478bd9Sstevel@tonic-gate 338137fbc076Saguzovsk /* 338237fbc076Saguzovsk * If an existing page is a large page, then demote 338337fbc076Saguzovsk * it to ensure that no "partial" large pages are 338437fbc076Saguzovsk * "created" after page_rename. An existing page 338537fbc076Saguzovsk * can be a CacheFS page, and can't belong to swapfs. 338637fbc076Saguzovsk */ 33877c478bd9Sstevel@tonic-gate if (hat_page_is_mapped(pp)) { 33887c478bd9Sstevel@tonic-gate /* 33897c478bd9Sstevel@tonic-gate * Unload translations. Since we hold the 33907c478bd9Sstevel@tonic-gate * exclusive lock on this page, the page 33917c478bd9Sstevel@tonic-gate * can not be changed while we drop phm. 33927c478bd9Sstevel@tonic-gate * This is also not a lock protocol violation, 33937c478bd9Sstevel@tonic-gate * but rather the proper way to do things. 33947c478bd9Sstevel@tonic-gate */ 33957c478bd9Sstevel@tonic-gate mutex_exit(phm); 33967c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 339737fbc076Saguzovsk if (pp->p_szc != 0) { 339837fbc076Saguzovsk ASSERT(!IS_SWAPFSVP(vp)); 339937fbc076Saguzovsk ASSERT(vp != &kvp); 340037fbc076Saguzovsk page_demote_vp_pages(pp); 340137fbc076Saguzovsk ASSERT(pp->p_szc == 0); 340237fbc076Saguzovsk } 340337fbc076Saguzovsk mutex_enter(phm); 340437fbc076Saguzovsk } else if (pp->p_szc != 0) { 340537fbc076Saguzovsk ASSERT(!IS_SWAPFSVP(vp)); 340637fbc076Saguzovsk ASSERT(vp != &kvp); 340737fbc076Saguzovsk mutex_exit(phm); 340837fbc076Saguzovsk page_demote_vp_pages(pp); 340937fbc076Saguzovsk ASSERT(pp->p_szc == 0); 34107c478bd9Sstevel@tonic-gate mutex_enter(phm); 34117c478bd9Sstevel@tonic-gate } 34127c478bd9Sstevel@tonic-gate page_hashout(pp, phm); 34137c478bd9Sstevel@tonic-gate } 34147c478bd9Sstevel@tonic-gate /* 34157c478bd9Sstevel@tonic-gate * Hash in the page with the new identity. 34167c478bd9Sstevel@tonic-gate */ 34177c478bd9Sstevel@tonic-gate if (!page_hashin(opp, vp, off, phm)) { 34187c478bd9Sstevel@tonic-gate /* 34197c478bd9Sstevel@tonic-gate * We were holding phm while we searched for [vp, off] 34207c478bd9Sstevel@tonic-gate * and only dropped phm if we found and locked a page. 34217c478bd9Sstevel@tonic-gate * If we can't create this page now, then some thing 34227c478bd9Sstevel@tonic-gate * is really broken. 34237c478bd9Sstevel@tonic-gate */ 34247c478bd9Sstevel@tonic-gate panic("page_rename: Can't hash in page: %p", (void *)pp); 34257c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 34267c478bd9Sstevel@tonic-gate } 34277c478bd9Sstevel@tonic-gate 34287c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(phm)); 34297c478bd9Sstevel@tonic-gate mutex_exit(phm); 34307c478bd9Sstevel@tonic-gate 34317c478bd9Sstevel@tonic-gate /* 34327c478bd9Sstevel@tonic-gate * Now that we have dropped phm, lets get around to finishing up 34337c478bd9Sstevel@tonic-gate * with pp. 34347c478bd9Sstevel@tonic-gate */ 34357c478bd9Sstevel@tonic-gate if (pp != NULL) { 34367c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(pp)); 34377c478bd9Sstevel@tonic-gate /* for now large pages should not end up here */ 34387c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 34397c478bd9Sstevel@tonic-gate /* 34407c478bd9Sstevel@tonic-gate * Save the locks for transfer to the new page and then 34417c478bd9Sstevel@tonic-gate * clear them so page_free doesn't think they're important. 34427c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt and 34437c478bd9Sstevel@tonic-gate * cowcnt since the page has an "exclusive" lock. 34447c478bd9Sstevel@tonic-gate */ 34457c478bd9Sstevel@tonic-gate olckcnt = pp->p_lckcnt; 34467c478bd9Sstevel@tonic-gate ocowcnt = pp->p_cowcnt; 34477c478bd9Sstevel@tonic-gate pp->p_lckcnt = pp->p_cowcnt = 0; 34487c478bd9Sstevel@tonic-gate 34497c478bd9Sstevel@tonic-gate /* 34507c478bd9Sstevel@tonic-gate * Put the page on the "free" list after we drop 34517c478bd9Sstevel@tonic-gate * the lock. The less work under the lock the better. 34527c478bd9Sstevel@tonic-gate */ 34537c478bd9Sstevel@tonic-gate /*LINTED: constant in conditional context*/ 34547c478bd9Sstevel@tonic-gate VN_DISPOSE(pp, B_FREE, 0, kcred); 34557c478bd9Sstevel@tonic-gate } 34567c478bd9Sstevel@tonic-gate 34577c478bd9Sstevel@tonic-gate /* 34587c478bd9Sstevel@tonic-gate * Transfer the lock count from the old page (if any). 34597c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt and 34607c478bd9Sstevel@tonic-gate * cowcnt since the page has an "exclusive" lock. 34617c478bd9Sstevel@tonic-gate */ 34627c478bd9Sstevel@tonic-gate opp->p_lckcnt += olckcnt; 34637c478bd9Sstevel@tonic-gate opp->p_cowcnt += ocowcnt; 34647c478bd9Sstevel@tonic-gate } 34657c478bd9Sstevel@tonic-gate 34667c478bd9Sstevel@tonic-gate /* 34677c478bd9Sstevel@tonic-gate * low level routine to add page `pp' to the hash and vp chains for [vp, offset] 34687c478bd9Sstevel@tonic-gate * 34697c478bd9Sstevel@tonic-gate * Pages are normally inserted at the start of a vnode's v_pages list. 34707c478bd9Sstevel@tonic-gate * If the vnode is VMODSORT and the page is modified, it goes at the end. 34717c478bd9Sstevel@tonic-gate * This can happen when a modified page is relocated for DR. 34727c478bd9Sstevel@tonic-gate * 34737c478bd9Sstevel@tonic-gate * Returns 1 on success and 0 on failure. 34747c478bd9Sstevel@tonic-gate */ 34757c478bd9Sstevel@tonic-gate static int 34767c478bd9Sstevel@tonic-gate page_do_hashin(page_t *pp, vnode_t *vp, u_offset_t offset) 34777c478bd9Sstevel@tonic-gate { 34787c478bd9Sstevel@tonic-gate page_t **listp; 34797c478bd9Sstevel@tonic-gate page_t *tp; 34807c478bd9Sstevel@tonic-gate ulong_t index; 34817c478bd9Sstevel@tonic-gate 34827c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 34837c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 34847c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(page_vnode_mutex(vp))); 34857c478bd9Sstevel@tonic-gate 34867c478bd9Sstevel@tonic-gate /* 34877c478bd9Sstevel@tonic-gate * Be sure to set these up before the page is inserted on the hash 34887c478bd9Sstevel@tonic-gate * list. As soon as the page is placed on the list some other 34897c478bd9Sstevel@tonic-gate * thread might get confused and wonder how this page could 34907c478bd9Sstevel@tonic-gate * possibly hash to this list. 34917c478bd9Sstevel@tonic-gate */ 34927c478bd9Sstevel@tonic-gate pp->p_vnode = vp; 34937c478bd9Sstevel@tonic-gate pp->p_offset = offset; 34947c478bd9Sstevel@tonic-gate 34957c478bd9Sstevel@tonic-gate /* 34967c478bd9Sstevel@tonic-gate * record if this page is on a swap vnode 34977c478bd9Sstevel@tonic-gate */ 34987c478bd9Sstevel@tonic-gate if ((vp->v_flag & VISSWAP) != 0) 34997c478bd9Sstevel@tonic-gate PP_SETSWAP(pp); 35007c478bd9Sstevel@tonic-gate 35017c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, offset); 35027c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(PAGE_HASH_MUTEX(index))); 35037c478bd9Sstevel@tonic-gate listp = &page_hash[index]; 35047c478bd9Sstevel@tonic-gate 35057c478bd9Sstevel@tonic-gate /* 35067c478bd9Sstevel@tonic-gate * If this page is already hashed in, fail this attempt to add it. 35077c478bd9Sstevel@tonic-gate */ 35087c478bd9Sstevel@tonic-gate for (tp = *listp; tp != NULL; tp = tp->p_hash) { 35097c478bd9Sstevel@tonic-gate if (tp->p_vnode == vp && tp->p_offset == offset) { 35107c478bd9Sstevel@tonic-gate pp->p_vnode = NULL; 35117c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)(-1); 35127c478bd9Sstevel@tonic-gate return (0); 35137c478bd9Sstevel@tonic-gate } 35147c478bd9Sstevel@tonic-gate } 35157c478bd9Sstevel@tonic-gate pp->p_hash = *listp; 35167c478bd9Sstevel@tonic-gate *listp = pp; 35177c478bd9Sstevel@tonic-gate 35187c478bd9Sstevel@tonic-gate /* 35197c478bd9Sstevel@tonic-gate * Add the page to the vnode's list of pages 35207c478bd9Sstevel@tonic-gate */ 35217c478bd9Sstevel@tonic-gate if (vp->v_pages != NULL && IS_VMODSORT(vp) && hat_ismod(pp)) 35227c478bd9Sstevel@tonic-gate listp = &vp->v_pages->p_vpprev->p_vpnext; 35237c478bd9Sstevel@tonic-gate else 35247c478bd9Sstevel@tonic-gate listp = &vp->v_pages; 35257c478bd9Sstevel@tonic-gate 35267c478bd9Sstevel@tonic-gate page_vpadd(listp, pp); 35277c478bd9Sstevel@tonic-gate 35287c478bd9Sstevel@tonic-gate return (1); 35297c478bd9Sstevel@tonic-gate } 35307c478bd9Sstevel@tonic-gate 35317c478bd9Sstevel@tonic-gate /* 35327c478bd9Sstevel@tonic-gate * Add page `pp' to both the hash and vp chains for [vp, offset]. 35337c478bd9Sstevel@tonic-gate * 35347c478bd9Sstevel@tonic-gate * Returns 1 on success and 0 on failure. 35357c478bd9Sstevel@tonic-gate * If hold is passed in, it is not dropped. 35367c478bd9Sstevel@tonic-gate */ 35377c478bd9Sstevel@tonic-gate int 35387c478bd9Sstevel@tonic-gate page_hashin(page_t *pp, vnode_t *vp, u_offset_t offset, kmutex_t *hold) 35397c478bd9Sstevel@tonic-gate { 35407c478bd9Sstevel@tonic-gate kmutex_t *phm = NULL; 35417c478bd9Sstevel@tonic-gate kmutex_t *vphm; 35427c478bd9Sstevel@tonic-gate int rc; 35437c478bd9Sstevel@tonic-gate 35447c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(vp))); 35457c478bd9Sstevel@tonic-gate 35467c478bd9Sstevel@tonic-gate TRACE_3(TR_FAC_VM, TR_PAGE_HASHIN, 35477c478bd9Sstevel@tonic-gate "page_hashin:pp %p vp %p offset %llx", 35487c478bd9Sstevel@tonic-gate pp, vp, offset); 35497c478bd9Sstevel@tonic-gate 35507c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashin_count); 35517c478bd9Sstevel@tonic-gate 35527c478bd9Sstevel@tonic-gate if (hold != NULL) 35537c478bd9Sstevel@tonic-gate phm = hold; 35547c478bd9Sstevel@tonic-gate else { 35557c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashin_not_held); 35567c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(PAGE_HASH_FUNC(vp, offset)); 35577c478bd9Sstevel@tonic-gate mutex_enter(phm); 35587c478bd9Sstevel@tonic-gate } 35597c478bd9Sstevel@tonic-gate 35607c478bd9Sstevel@tonic-gate vphm = page_vnode_mutex(vp); 35617c478bd9Sstevel@tonic-gate mutex_enter(vphm); 35627c478bd9Sstevel@tonic-gate rc = page_do_hashin(pp, vp, offset); 35637c478bd9Sstevel@tonic-gate mutex_exit(vphm); 35647c478bd9Sstevel@tonic-gate if (hold == NULL) 35657c478bd9Sstevel@tonic-gate mutex_exit(phm); 35667c478bd9Sstevel@tonic-gate if (rc == 0) 35677c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashin_already); 35687c478bd9Sstevel@tonic-gate return (rc); 35697c478bd9Sstevel@tonic-gate } 35707c478bd9Sstevel@tonic-gate 35717c478bd9Sstevel@tonic-gate /* 35727c478bd9Sstevel@tonic-gate * Remove page ``pp'' from the hash and vp chains and remove vp association. 35737c478bd9Sstevel@tonic-gate * All mutexes must be held 35747c478bd9Sstevel@tonic-gate */ 35757c478bd9Sstevel@tonic-gate static void 35767c478bd9Sstevel@tonic-gate page_do_hashout(page_t *pp) 35777c478bd9Sstevel@tonic-gate { 35787c478bd9Sstevel@tonic-gate page_t **hpp; 35797c478bd9Sstevel@tonic-gate page_t *hp; 35807c478bd9Sstevel@tonic-gate vnode_t *vp = pp->p_vnode; 35817c478bd9Sstevel@tonic-gate 35827c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 35837c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(page_vnode_mutex(vp))); 35847c478bd9Sstevel@tonic-gate 35857c478bd9Sstevel@tonic-gate /* 35867c478bd9Sstevel@tonic-gate * First, take pp off of its hash chain. 35877c478bd9Sstevel@tonic-gate */ 35887c478bd9Sstevel@tonic-gate hpp = &page_hash[PAGE_HASH_FUNC(vp, pp->p_offset)]; 35897c478bd9Sstevel@tonic-gate 35907c478bd9Sstevel@tonic-gate for (;;) { 35917c478bd9Sstevel@tonic-gate hp = *hpp; 35927c478bd9Sstevel@tonic-gate if (hp == pp) 35937c478bd9Sstevel@tonic-gate break; 35947c478bd9Sstevel@tonic-gate if (hp == NULL) { 35957c478bd9Sstevel@tonic-gate panic("page_do_hashout"); 35967c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 35977c478bd9Sstevel@tonic-gate } 35987c478bd9Sstevel@tonic-gate hpp = &hp->p_hash; 35997c478bd9Sstevel@tonic-gate } 36007c478bd9Sstevel@tonic-gate *hpp = pp->p_hash; 36017c478bd9Sstevel@tonic-gate 36027c478bd9Sstevel@tonic-gate /* 36037c478bd9Sstevel@tonic-gate * Now remove it from its associated vnode. 36047c478bd9Sstevel@tonic-gate */ 36057c478bd9Sstevel@tonic-gate if (vp->v_pages) 36067c478bd9Sstevel@tonic-gate page_vpsub(&vp->v_pages, pp); 36077c478bd9Sstevel@tonic-gate 36087c478bd9Sstevel@tonic-gate pp->p_hash = NULL; 36097c478bd9Sstevel@tonic-gate page_clr_all_props(pp); 36107c478bd9Sstevel@tonic-gate PP_CLRSWAP(pp); 36117c478bd9Sstevel@tonic-gate pp->p_vnode = NULL; 36127c478bd9Sstevel@tonic-gate pp->p_offset = (u_offset_t)-1; 36137c478bd9Sstevel@tonic-gate } 36147c478bd9Sstevel@tonic-gate 36157c478bd9Sstevel@tonic-gate /* 36167c478bd9Sstevel@tonic-gate * Remove page ``pp'' from the hash and vp chains and remove vp association. 36177c478bd9Sstevel@tonic-gate * 36187c478bd9Sstevel@tonic-gate * When `phm' is non-NULL it contains the address of the mutex protecting the 36197c478bd9Sstevel@tonic-gate * hash list pp is on. It is not dropped. 36207c478bd9Sstevel@tonic-gate */ 36217c478bd9Sstevel@tonic-gate void 36227c478bd9Sstevel@tonic-gate page_hashout(page_t *pp, kmutex_t *phm) 36237c478bd9Sstevel@tonic-gate { 36247c478bd9Sstevel@tonic-gate vnode_t *vp; 36257c478bd9Sstevel@tonic-gate ulong_t index; 36267c478bd9Sstevel@tonic-gate kmutex_t *nphm; 36277c478bd9Sstevel@tonic-gate kmutex_t *vphm; 36287c478bd9Sstevel@tonic-gate kmutex_t *sep; 36297c478bd9Sstevel@tonic-gate 36307c478bd9Sstevel@tonic-gate ASSERT(phm != NULL ? MUTEX_HELD(phm) : 1); 36317c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode != NULL); 36327c478bd9Sstevel@tonic-gate ASSERT((PAGE_EXCL(pp) && !page_iolock_assert(pp)) || panicstr); 36337c478bd9Sstevel@tonic-gate ASSERT(MUTEX_NOT_HELD(page_vnode_mutex(pp->p_vnode))); 36347c478bd9Sstevel@tonic-gate 36357c478bd9Sstevel@tonic-gate vp = pp->p_vnode; 36367c478bd9Sstevel@tonic-gate 36377c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_VM, TR_PAGE_HASHOUT, 36387c478bd9Sstevel@tonic-gate "page_hashout:pp %p vp %p", pp, vp); 36397c478bd9Sstevel@tonic-gate 36407c478bd9Sstevel@tonic-gate /* Kernel probe */ 36417c478bd9Sstevel@tonic-gate TNF_PROBE_2(page_unmap, "vm pagefault", /* CSTYLED */, 36427c478bd9Sstevel@tonic-gate tnf_opaque, vnode, vp, 36437c478bd9Sstevel@tonic-gate tnf_offset, offset, pp->p_offset); 36447c478bd9Sstevel@tonic-gate 36457c478bd9Sstevel@tonic-gate /* 36467c478bd9Sstevel@tonic-gate * 36477c478bd9Sstevel@tonic-gate */ 36487c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashout_count); 36497c478bd9Sstevel@tonic-gate index = PAGE_HASH_FUNC(vp, pp->p_offset); 36507c478bd9Sstevel@tonic-gate if (phm == NULL) { 36517c478bd9Sstevel@tonic-gate VM_STAT_ADD(hashout_not_held); 36527c478bd9Sstevel@tonic-gate nphm = PAGE_HASH_MUTEX(index); 36537c478bd9Sstevel@tonic-gate mutex_enter(nphm); 36547c478bd9Sstevel@tonic-gate } 36557c478bd9Sstevel@tonic-gate ASSERT(phm ? phm == PAGE_HASH_MUTEX(index) : 1); 36567c478bd9Sstevel@tonic-gate 36577c478bd9Sstevel@tonic-gate 36587c478bd9Sstevel@tonic-gate /* 36597c478bd9Sstevel@tonic-gate * grab page vnode mutex and remove it... 36607c478bd9Sstevel@tonic-gate */ 36617c478bd9Sstevel@tonic-gate vphm = page_vnode_mutex(vp); 36627c478bd9Sstevel@tonic-gate mutex_enter(vphm); 36637c478bd9Sstevel@tonic-gate 36647c478bd9Sstevel@tonic-gate page_do_hashout(pp); 36657c478bd9Sstevel@tonic-gate 36667c478bd9Sstevel@tonic-gate mutex_exit(vphm); 36677c478bd9Sstevel@tonic-gate if (phm == NULL) 36687c478bd9Sstevel@tonic-gate mutex_exit(nphm); 36697c478bd9Sstevel@tonic-gate 36707c478bd9Sstevel@tonic-gate /* 36717c478bd9Sstevel@tonic-gate * Wake up processes waiting for this page. The page's 36727c478bd9Sstevel@tonic-gate * identity has been changed, and is probably not the 36737c478bd9Sstevel@tonic-gate * desired page any longer. 36747c478bd9Sstevel@tonic-gate */ 36757c478bd9Sstevel@tonic-gate sep = page_se_mutex(pp); 36767c478bd9Sstevel@tonic-gate mutex_enter(sep); 367742787a71Sstans pp->p_selock &= ~SE_EWANTED; 36787c478bd9Sstevel@tonic-gate if (CV_HAS_WAITERS(&pp->p_cv)) 36797c478bd9Sstevel@tonic-gate cv_broadcast(&pp->p_cv); 36807c478bd9Sstevel@tonic-gate mutex_exit(sep); 36817c478bd9Sstevel@tonic-gate } 36827c478bd9Sstevel@tonic-gate 36837c478bd9Sstevel@tonic-gate /* 36847c478bd9Sstevel@tonic-gate * Add the page to the front of a linked list of pages 36857c478bd9Sstevel@tonic-gate * using the p_next & p_prev pointers for the list. 36867c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the list pointers. 36877c478bd9Sstevel@tonic-gate */ 36887c478bd9Sstevel@tonic-gate void 36897c478bd9Sstevel@tonic-gate page_add(page_t **ppp, page_t *pp) 36907c478bd9Sstevel@tonic-gate { 36917c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp) || (PAGE_SHARED(pp) && page_iolock_assert(pp))); 36927c478bd9Sstevel@tonic-gate 36937c478bd9Sstevel@tonic-gate page_add_common(ppp, pp); 36947c478bd9Sstevel@tonic-gate } 36957c478bd9Sstevel@tonic-gate 36967c478bd9Sstevel@tonic-gate 36977c478bd9Sstevel@tonic-gate 36987c478bd9Sstevel@tonic-gate /* 36997c478bd9Sstevel@tonic-gate * Common code for page_add() and mach_page_add() 37007c478bd9Sstevel@tonic-gate */ 37017c478bd9Sstevel@tonic-gate void 37027c478bd9Sstevel@tonic-gate page_add_common(page_t **ppp, page_t *pp) 37037c478bd9Sstevel@tonic-gate { 37047c478bd9Sstevel@tonic-gate if (*ppp == NULL) { 37057c478bd9Sstevel@tonic-gate pp->p_next = pp->p_prev = pp; 37067c478bd9Sstevel@tonic-gate } else { 37077c478bd9Sstevel@tonic-gate pp->p_next = *ppp; 37087c478bd9Sstevel@tonic-gate pp->p_prev = (*ppp)->p_prev; 37097c478bd9Sstevel@tonic-gate (*ppp)->p_prev = pp; 37107c478bd9Sstevel@tonic-gate pp->p_prev->p_next = pp; 37117c478bd9Sstevel@tonic-gate } 37127c478bd9Sstevel@tonic-gate *ppp = pp; 37137c478bd9Sstevel@tonic-gate } 37147c478bd9Sstevel@tonic-gate 37157c478bd9Sstevel@tonic-gate 37167c478bd9Sstevel@tonic-gate /* 37177c478bd9Sstevel@tonic-gate * Remove this page from a linked list of pages 37187c478bd9Sstevel@tonic-gate * using the p_next & p_prev pointers for the list. 37197c478bd9Sstevel@tonic-gate * 37207c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the list pointers. 37217c478bd9Sstevel@tonic-gate */ 37227c478bd9Sstevel@tonic-gate void 37237c478bd9Sstevel@tonic-gate page_sub(page_t **ppp, page_t *pp) 37247c478bd9Sstevel@tonic-gate { 37257c478bd9Sstevel@tonic-gate ASSERT((PP_ISFREE(pp)) ? 1 : 37267c478bd9Sstevel@tonic-gate (PAGE_EXCL(pp)) || (PAGE_SHARED(pp) && page_iolock_assert(pp))); 37277c478bd9Sstevel@tonic-gate 37287c478bd9Sstevel@tonic-gate if (*ppp == NULL || pp == NULL) { 37297c478bd9Sstevel@tonic-gate panic("page_sub: bad arg(s): pp %p, *ppp %p", 37307c478bd9Sstevel@tonic-gate (void *)pp, (void *)(*ppp)); 37317c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 37327c478bd9Sstevel@tonic-gate } 37337c478bd9Sstevel@tonic-gate 37347c478bd9Sstevel@tonic-gate page_sub_common(ppp, pp); 37357c478bd9Sstevel@tonic-gate } 37367c478bd9Sstevel@tonic-gate 37377c478bd9Sstevel@tonic-gate 37387c478bd9Sstevel@tonic-gate /* 37397c478bd9Sstevel@tonic-gate * Common code for page_sub() and mach_page_sub() 37407c478bd9Sstevel@tonic-gate */ 37417c478bd9Sstevel@tonic-gate void 37427c478bd9Sstevel@tonic-gate page_sub_common(page_t **ppp, page_t *pp) 37437c478bd9Sstevel@tonic-gate { 37447c478bd9Sstevel@tonic-gate if (*ppp == pp) 37457c478bd9Sstevel@tonic-gate *ppp = pp->p_next; /* go to next page */ 37467c478bd9Sstevel@tonic-gate 37477c478bd9Sstevel@tonic-gate if (*ppp == pp) 37487c478bd9Sstevel@tonic-gate *ppp = NULL; /* page list is gone */ 37497c478bd9Sstevel@tonic-gate else { 37507c478bd9Sstevel@tonic-gate pp->p_prev->p_next = pp->p_next; 37517c478bd9Sstevel@tonic-gate pp->p_next->p_prev = pp->p_prev; 37527c478bd9Sstevel@tonic-gate } 37537c478bd9Sstevel@tonic-gate pp->p_prev = pp->p_next = pp; /* make pp a list of one */ 37547c478bd9Sstevel@tonic-gate } 37557c478bd9Sstevel@tonic-gate 37567c478bd9Sstevel@tonic-gate 37577c478bd9Sstevel@tonic-gate /* 37587c478bd9Sstevel@tonic-gate * Break page list cppp into two lists with npages in the first list. 37597c478bd9Sstevel@tonic-gate * The tail is returned in nppp. 37607c478bd9Sstevel@tonic-gate */ 37617c478bd9Sstevel@tonic-gate void 37627c478bd9Sstevel@tonic-gate page_list_break(page_t **oppp, page_t **nppp, pgcnt_t npages) 37637c478bd9Sstevel@tonic-gate { 37647c478bd9Sstevel@tonic-gate page_t *s1pp = *oppp; 37657c478bd9Sstevel@tonic-gate page_t *s2pp; 37667c478bd9Sstevel@tonic-gate page_t *e1pp, *e2pp; 37677c478bd9Sstevel@tonic-gate long n = 0; 37687c478bd9Sstevel@tonic-gate 37697c478bd9Sstevel@tonic-gate if (s1pp == NULL) { 37707c478bd9Sstevel@tonic-gate *nppp = NULL; 37717c478bd9Sstevel@tonic-gate return; 37727c478bd9Sstevel@tonic-gate } 37737c478bd9Sstevel@tonic-gate if (npages == 0) { 37747c478bd9Sstevel@tonic-gate *nppp = s1pp; 37757c478bd9Sstevel@tonic-gate *oppp = NULL; 37767c478bd9Sstevel@tonic-gate return; 37777c478bd9Sstevel@tonic-gate } 37787c478bd9Sstevel@tonic-gate for (n = 0, s2pp = *oppp; n < npages; n++) { 37797c478bd9Sstevel@tonic-gate s2pp = s2pp->p_next; 37807c478bd9Sstevel@tonic-gate } 37817c478bd9Sstevel@tonic-gate /* Fix head and tail of new lists */ 37827c478bd9Sstevel@tonic-gate e1pp = s2pp->p_prev; 37837c478bd9Sstevel@tonic-gate e2pp = s1pp->p_prev; 37847c478bd9Sstevel@tonic-gate s1pp->p_prev = e1pp; 37857c478bd9Sstevel@tonic-gate e1pp->p_next = s1pp; 37867c478bd9Sstevel@tonic-gate s2pp->p_prev = e2pp; 37877c478bd9Sstevel@tonic-gate e2pp->p_next = s2pp; 37887c478bd9Sstevel@tonic-gate 37897c478bd9Sstevel@tonic-gate /* second list empty */ 37907c478bd9Sstevel@tonic-gate if (s2pp == s1pp) { 37917c478bd9Sstevel@tonic-gate *oppp = s1pp; 37927c478bd9Sstevel@tonic-gate *nppp = NULL; 37937c478bd9Sstevel@tonic-gate } else { 37947c478bd9Sstevel@tonic-gate *oppp = s1pp; 37957c478bd9Sstevel@tonic-gate *nppp = s2pp; 37967c478bd9Sstevel@tonic-gate } 37977c478bd9Sstevel@tonic-gate } 37987c478bd9Sstevel@tonic-gate 37997c478bd9Sstevel@tonic-gate /* 38007c478bd9Sstevel@tonic-gate * Concatenate page list nppp onto the end of list ppp. 38017c478bd9Sstevel@tonic-gate */ 38027c478bd9Sstevel@tonic-gate void 38037c478bd9Sstevel@tonic-gate page_list_concat(page_t **ppp, page_t **nppp) 38047c478bd9Sstevel@tonic-gate { 38057c478bd9Sstevel@tonic-gate page_t *s1pp, *s2pp, *e1pp, *e2pp; 38067c478bd9Sstevel@tonic-gate 38077c478bd9Sstevel@tonic-gate if (*nppp == NULL) { 38087c478bd9Sstevel@tonic-gate return; 38097c478bd9Sstevel@tonic-gate } 38107c478bd9Sstevel@tonic-gate if (*ppp == NULL) { 38117c478bd9Sstevel@tonic-gate *ppp = *nppp; 38127c478bd9Sstevel@tonic-gate return; 38137c478bd9Sstevel@tonic-gate } 38147c478bd9Sstevel@tonic-gate s1pp = *ppp; 38157c478bd9Sstevel@tonic-gate e1pp = s1pp->p_prev; 38167c478bd9Sstevel@tonic-gate s2pp = *nppp; 38177c478bd9Sstevel@tonic-gate e2pp = s2pp->p_prev; 38187c478bd9Sstevel@tonic-gate s1pp->p_prev = e2pp; 38197c478bd9Sstevel@tonic-gate e2pp->p_next = s1pp; 38207c478bd9Sstevel@tonic-gate e1pp->p_next = s2pp; 38217c478bd9Sstevel@tonic-gate s2pp->p_prev = e1pp; 38227c478bd9Sstevel@tonic-gate } 38237c478bd9Sstevel@tonic-gate 38247c478bd9Sstevel@tonic-gate /* 38257c478bd9Sstevel@tonic-gate * return the next page in the page list 38267c478bd9Sstevel@tonic-gate */ 38277c478bd9Sstevel@tonic-gate page_t * 38287c478bd9Sstevel@tonic-gate page_list_next(page_t *pp) 38297c478bd9Sstevel@tonic-gate { 38307c478bd9Sstevel@tonic-gate return (pp->p_next); 38317c478bd9Sstevel@tonic-gate } 38327c478bd9Sstevel@tonic-gate 38337c478bd9Sstevel@tonic-gate 38347c478bd9Sstevel@tonic-gate /* 38357c478bd9Sstevel@tonic-gate * Add the page to the front of the linked list of pages 38367c478bd9Sstevel@tonic-gate * using p_vpnext/p_vpprev pointers for the list. 38377c478bd9Sstevel@tonic-gate * 38387c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the lists. 38397c478bd9Sstevel@tonic-gate */ 38407c478bd9Sstevel@tonic-gate void 38417c478bd9Sstevel@tonic-gate page_vpadd(page_t **ppp, page_t *pp) 38427c478bd9Sstevel@tonic-gate { 38437c478bd9Sstevel@tonic-gate if (*ppp == NULL) { 38447c478bd9Sstevel@tonic-gate pp->p_vpnext = pp->p_vpprev = pp; 38457c478bd9Sstevel@tonic-gate } else { 38467c478bd9Sstevel@tonic-gate pp->p_vpnext = *ppp; 38477c478bd9Sstevel@tonic-gate pp->p_vpprev = (*ppp)->p_vpprev; 38487c478bd9Sstevel@tonic-gate (*ppp)->p_vpprev = pp; 38497c478bd9Sstevel@tonic-gate pp->p_vpprev->p_vpnext = pp; 38507c478bd9Sstevel@tonic-gate } 38517c478bd9Sstevel@tonic-gate *ppp = pp; 38527c478bd9Sstevel@tonic-gate } 38537c478bd9Sstevel@tonic-gate 38547c478bd9Sstevel@tonic-gate /* 38557c478bd9Sstevel@tonic-gate * Remove this page from the linked list of pages 38567c478bd9Sstevel@tonic-gate * using p_vpnext/p_vpprev pointers for the list. 38577c478bd9Sstevel@tonic-gate * 38587c478bd9Sstevel@tonic-gate * The caller is responsible for protecting the lists. 38597c478bd9Sstevel@tonic-gate */ 38607c478bd9Sstevel@tonic-gate void 38617c478bd9Sstevel@tonic-gate page_vpsub(page_t **ppp, page_t *pp) 38627c478bd9Sstevel@tonic-gate { 38637c478bd9Sstevel@tonic-gate if (*ppp == NULL || pp == NULL) { 38647c478bd9Sstevel@tonic-gate panic("page_vpsub: bad arg(s): pp %p, *ppp %p", 38657c478bd9Sstevel@tonic-gate (void *)pp, (void *)(*ppp)); 38667c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 38677c478bd9Sstevel@tonic-gate } 38687c478bd9Sstevel@tonic-gate 38697c478bd9Sstevel@tonic-gate if (*ppp == pp) 38707c478bd9Sstevel@tonic-gate *ppp = pp->p_vpnext; /* go to next page */ 38717c478bd9Sstevel@tonic-gate 38727c478bd9Sstevel@tonic-gate if (*ppp == pp) 38737c478bd9Sstevel@tonic-gate *ppp = NULL; /* page list is gone */ 38747c478bd9Sstevel@tonic-gate else { 38757c478bd9Sstevel@tonic-gate pp->p_vpprev->p_vpnext = pp->p_vpnext; 38767c478bd9Sstevel@tonic-gate pp->p_vpnext->p_vpprev = pp->p_vpprev; 38777c478bd9Sstevel@tonic-gate } 38787c478bd9Sstevel@tonic-gate pp->p_vpprev = pp->p_vpnext = pp; /* make pp a list of one */ 38797c478bd9Sstevel@tonic-gate } 38807c478bd9Sstevel@tonic-gate 38817c478bd9Sstevel@tonic-gate /* 38827c478bd9Sstevel@tonic-gate * Lock a physical page into memory "long term". Used to support "lock 38837c478bd9Sstevel@tonic-gate * in memory" functions. Accepts the page to be locked, and a cow variable 38847c478bd9Sstevel@tonic-gate * to indicate whether a the lock will travel to the new page during 38857c478bd9Sstevel@tonic-gate * a potential copy-on-write. 38867c478bd9Sstevel@tonic-gate */ 38877c478bd9Sstevel@tonic-gate int 38887c478bd9Sstevel@tonic-gate page_pp_lock( 38897c478bd9Sstevel@tonic-gate page_t *pp, /* page to be locked */ 38907c478bd9Sstevel@tonic-gate int cow, /* cow lock */ 38917c478bd9Sstevel@tonic-gate int kernel) /* must succeed -- ignore checking */ 38927c478bd9Sstevel@tonic-gate { 38937c478bd9Sstevel@tonic-gate int r = 0; /* result -- assume failure */ 38947c478bd9Sstevel@tonic-gate 38957c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 38967c478bd9Sstevel@tonic-gate 38977c478bd9Sstevel@tonic-gate page_struct_lock(pp); 38987c478bd9Sstevel@tonic-gate /* 38997c478bd9Sstevel@tonic-gate * Acquire the "freemem_lock" for availrmem. 39007c478bd9Sstevel@tonic-gate */ 39017c478bd9Sstevel@tonic-gate if (cow) { 39027c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39037c478bd9Sstevel@tonic-gate if ((availrmem > pages_pp_maximum) && 39047c478bd9Sstevel@tonic-gate (pp->p_cowcnt < (ushort_t)PAGE_LOCK_MAXIMUM)) { 39057c478bd9Sstevel@tonic-gate availrmem--; 39067c478bd9Sstevel@tonic-gate pages_locked++; 39077c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39087c478bd9Sstevel@tonic-gate r = 1; 39097c478bd9Sstevel@tonic-gate if (++pp->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 39107c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 39117c478bd9Sstevel@tonic-gate "COW lock limit reached on pfn 0x%lx", 39127c478bd9Sstevel@tonic-gate page_pptonum(pp)); 39137c478bd9Sstevel@tonic-gate } 39147c478bd9Sstevel@tonic-gate } else 39157c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39167c478bd9Sstevel@tonic-gate } else { 39177c478bd9Sstevel@tonic-gate if (pp->p_lckcnt) { 39187c478bd9Sstevel@tonic-gate if (pp->p_lckcnt < (ushort_t)PAGE_LOCK_MAXIMUM) { 39197c478bd9Sstevel@tonic-gate r = 1; 39207c478bd9Sstevel@tonic-gate if (++pp->p_lckcnt == 39217c478bd9Sstevel@tonic-gate (ushort_t)PAGE_LOCK_MAXIMUM) { 39227c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, "Page lock limit " 39237c478bd9Sstevel@tonic-gate "reached on pfn 0x%lx", 39247c478bd9Sstevel@tonic-gate page_pptonum(pp)); 39257c478bd9Sstevel@tonic-gate } 39267c478bd9Sstevel@tonic-gate } 39277c478bd9Sstevel@tonic-gate } else { 39287c478bd9Sstevel@tonic-gate if (kernel) { 39297c478bd9Sstevel@tonic-gate /* availrmem accounting done by caller */ 39307c478bd9Sstevel@tonic-gate ++pp->p_lckcnt; 39317c478bd9Sstevel@tonic-gate r = 1; 39327c478bd9Sstevel@tonic-gate } else { 39337c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39347c478bd9Sstevel@tonic-gate if (availrmem > pages_pp_maximum) { 39357c478bd9Sstevel@tonic-gate availrmem--; 39367c478bd9Sstevel@tonic-gate pages_locked++; 39377c478bd9Sstevel@tonic-gate ++pp->p_lckcnt; 39387c478bd9Sstevel@tonic-gate r = 1; 39397c478bd9Sstevel@tonic-gate } 39407c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39417c478bd9Sstevel@tonic-gate } 39427c478bd9Sstevel@tonic-gate } 39437c478bd9Sstevel@tonic-gate } 39447c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 39457c478bd9Sstevel@tonic-gate return (r); 39467c478bd9Sstevel@tonic-gate } 39477c478bd9Sstevel@tonic-gate 39487c478bd9Sstevel@tonic-gate /* 39497c478bd9Sstevel@tonic-gate * Decommit a lock on a physical page frame. Account for cow locks if 39507c478bd9Sstevel@tonic-gate * appropriate. 39517c478bd9Sstevel@tonic-gate */ 39527c478bd9Sstevel@tonic-gate void 39537c478bd9Sstevel@tonic-gate page_pp_unlock( 39547c478bd9Sstevel@tonic-gate page_t *pp, /* page to be unlocked */ 39557c478bd9Sstevel@tonic-gate int cow, /* expect cow lock */ 39567c478bd9Sstevel@tonic-gate int kernel) /* this was a kernel lock */ 39577c478bd9Sstevel@tonic-gate { 39587c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 39597c478bd9Sstevel@tonic-gate 39607c478bd9Sstevel@tonic-gate page_struct_lock(pp); 39617c478bd9Sstevel@tonic-gate /* 39627c478bd9Sstevel@tonic-gate * Acquire the "freemem_lock" for availrmem. 39637c478bd9Sstevel@tonic-gate * If cowcnt or lcknt is already 0 do nothing; i.e., we 39647c478bd9Sstevel@tonic-gate * could be called to unlock even if nothing is locked. This could 39657c478bd9Sstevel@tonic-gate * happen if locked file pages were truncated (removing the lock) 39667c478bd9Sstevel@tonic-gate * and the file was grown again and new pages faulted in; the new 39677c478bd9Sstevel@tonic-gate * pages are unlocked but the segment still thinks they're locked. 39687c478bd9Sstevel@tonic-gate */ 39697c478bd9Sstevel@tonic-gate if (cow) { 39707c478bd9Sstevel@tonic-gate if (pp->p_cowcnt) { 39717c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39727c478bd9Sstevel@tonic-gate pp->p_cowcnt--; 39737c478bd9Sstevel@tonic-gate availrmem++; 39747c478bd9Sstevel@tonic-gate pages_locked--; 39757c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39767c478bd9Sstevel@tonic-gate } 39777c478bd9Sstevel@tonic-gate } else { 39787c478bd9Sstevel@tonic-gate if (pp->p_lckcnt && --pp->p_lckcnt == 0) { 39797c478bd9Sstevel@tonic-gate if (!kernel) { 39807c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39817c478bd9Sstevel@tonic-gate availrmem++; 39827c478bd9Sstevel@tonic-gate pages_locked--; 39837c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 39847c478bd9Sstevel@tonic-gate } 39857c478bd9Sstevel@tonic-gate } 39867c478bd9Sstevel@tonic-gate } 39877c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 39887c478bd9Sstevel@tonic-gate } 39897c478bd9Sstevel@tonic-gate 39907c478bd9Sstevel@tonic-gate /* 39917c478bd9Sstevel@tonic-gate * This routine reserves availrmem for npages; 39927c478bd9Sstevel@tonic-gate * flags: KM_NOSLEEP or KM_SLEEP 39937c478bd9Sstevel@tonic-gate * returns 1 on success or 0 on failure 39947c478bd9Sstevel@tonic-gate */ 39957c478bd9Sstevel@tonic-gate int 39967c478bd9Sstevel@tonic-gate page_resv(pgcnt_t npages, uint_t flags) 39977c478bd9Sstevel@tonic-gate { 39987c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 39997c478bd9Sstevel@tonic-gate while (availrmem < tune.t_minarmem + npages) { 40007c478bd9Sstevel@tonic-gate if (flags & KM_NOSLEEP) { 40017c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40027c478bd9Sstevel@tonic-gate return (0); 40037c478bd9Sstevel@tonic-gate } 40047c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40057c478bd9Sstevel@tonic-gate page_needfree(npages); 40067c478bd9Sstevel@tonic-gate kmem_reap(); 40077c478bd9Sstevel@tonic-gate delay(hz >> 2); 40087c478bd9Sstevel@tonic-gate page_needfree(-(spgcnt_t)npages); 40097c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 40107c478bd9Sstevel@tonic-gate } 40117c478bd9Sstevel@tonic-gate availrmem -= npages; 40127c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40137c478bd9Sstevel@tonic-gate return (1); 40147c478bd9Sstevel@tonic-gate } 40157c478bd9Sstevel@tonic-gate 40167c478bd9Sstevel@tonic-gate /* 40177c478bd9Sstevel@tonic-gate * This routine unreserves availrmem for npages; 40187c478bd9Sstevel@tonic-gate */ 40197c478bd9Sstevel@tonic-gate void 40207c478bd9Sstevel@tonic-gate page_unresv(pgcnt_t npages) 40217c478bd9Sstevel@tonic-gate { 40227c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 40237c478bd9Sstevel@tonic-gate availrmem += npages; 40247c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40257c478bd9Sstevel@tonic-gate } 40267c478bd9Sstevel@tonic-gate 40277c478bd9Sstevel@tonic-gate /* 40287c478bd9Sstevel@tonic-gate * See Statement at the beginning of segvn_lockop() regarding 40297c478bd9Sstevel@tonic-gate * the way we handle cowcnts and lckcnts. 40307c478bd9Sstevel@tonic-gate * 40317c478bd9Sstevel@tonic-gate * Transfer cowcnt on 'opp' to cowcnt on 'npp' if the vpage 40327c478bd9Sstevel@tonic-gate * that breaks COW has PROT_WRITE. 40337c478bd9Sstevel@tonic-gate * 40347c478bd9Sstevel@tonic-gate * Note that, we may also break COW in case we are softlocking 40357c478bd9Sstevel@tonic-gate * on read access during physio; 40367c478bd9Sstevel@tonic-gate * in this softlock case, the vpage may not have PROT_WRITE. 40377c478bd9Sstevel@tonic-gate * So, we need to transfer lckcnt on 'opp' to lckcnt on 'npp' 40387c478bd9Sstevel@tonic-gate * if the vpage doesn't have PROT_WRITE. 40397c478bd9Sstevel@tonic-gate * 40407c478bd9Sstevel@tonic-gate * This routine is never called if we are stealing a page 40417c478bd9Sstevel@tonic-gate * in anon_private. 40427c478bd9Sstevel@tonic-gate * 40437c478bd9Sstevel@tonic-gate * The caller subtracted from availrmem for read only mapping. 40447c478bd9Sstevel@tonic-gate * if lckcnt is 1 increment availrmem. 40457c478bd9Sstevel@tonic-gate */ 40467c478bd9Sstevel@tonic-gate void 40477c478bd9Sstevel@tonic-gate page_pp_useclaim( 40487c478bd9Sstevel@tonic-gate page_t *opp, /* original page frame losing lock */ 40497c478bd9Sstevel@tonic-gate page_t *npp, /* new page frame gaining lock */ 40507c478bd9Sstevel@tonic-gate uint_t write_perm) /* set if vpage has PROT_WRITE */ 40517c478bd9Sstevel@tonic-gate { 40527c478bd9Sstevel@tonic-gate int payback = 0; 40537c478bd9Sstevel@tonic-gate 40547c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(opp)); 40557c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(npp)); 40567c478bd9Sstevel@tonic-gate 40577c478bd9Sstevel@tonic-gate page_struct_lock(opp); 40587c478bd9Sstevel@tonic-gate 40597c478bd9Sstevel@tonic-gate ASSERT(npp->p_cowcnt == 0); 40607c478bd9Sstevel@tonic-gate ASSERT(npp->p_lckcnt == 0); 40617c478bd9Sstevel@tonic-gate 40627c478bd9Sstevel@tonic-gate /* Don't use claim if nothing is locked (see page_pp_unlock above) */ 40637c478bd9Sstevel@tonic-gate if ((write_perm && opp->p_cowcnt != 0) || 40647c478bd9Sstevel@tonic-gate (!write_perm && opp->p_lckcnt != 0)) { 40657c478bd9Sstevel@tonic-gate 40667c478bd9Sstevel@tonic-gate if (write_perm) { 40677c478bd9Sstevel@tonic-gate npp->p_cowcnt++; 40687c478bd9Sstevel@tonic-gate ASSERT(opp->p_cowcnt != 0); 40697c478bd9Sstevel@tonic-gate opp->p_cowcnt--; 40707c478bd9Sstevel@tonic-gate } else { 40717c478bd9Sstevel@tonic-gate 40727c478bd9Sstevel@tonic-gate ASSERT(opp->p_lckcnt != 0); 40737c478bd9Sstevel@tonic-gate 40747c478bd9Sstevel@tonic-gate /* 40757c478bd9Sstevel@tonic-gate * We didn't need availrmem decremented if p_lckcnt on 40767c478bd9Sstevel@tonic-gate * original page is 1. Here, we are unlocking 40777c478bd9Sstevel@tonic-gate * read-only copy belonging to original page and 40787c478bd9Sstevel@tonic-gate * are locking a copy belonging to new page. 40797c478bd9Sstevel@tonic-gate */ 40807c478bd9Sstevel@tonic-gate if (opp->p_lckcnt == 1) 40817c478bd9Sstevel@tonic-gate payback = 1; 40827c478bd9Sstevel@tonic-gate 40837c478bd9Sstevel@tonic-gate npp->p_lckcnt++; 40847c478bd9Sstevel@tonic-gate opp->p_lckcnt--; 40857c478bd9Sstevel@tonic-gate } 40867c478bd9Sstevel@tonic-gate } 40877c478bd9Sstevel@tonic-gate if (payback) { 40887c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 40897c478bd9Sstevel@tonic-gate availrmem++; 40907c478bd9Sstevel@tonic-gate pages_useclaim--; 40917c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 40927c478bd9Sstevel@tonic-gate } 40937c478bd9Sstevel@tonic-gate page_struct_unlock(opp); 40947c478bd9Sstevel@tonic-gate } 40957c478bd9Sstevel@tonic-gate 40967c478bd9Sstevel@tonic-gate /* 40977c478bd9Sstevel@tonic-gate * Simple claim adjust functions -- used to support changes in 40987c478bd9Sstevel@tonic-gate * claims due to changes in access permissions. Used by segvn_setprot(). 40997c478bd9Sstevel@tonic-gate */ 41007c478bd9Sstevel@tonic-gate int 41017c478bd9Sstevel@tonic-gate page_addclaim(page_t *pp) 41027c478bd9Sstevel@tonic-gate { 41037c478bd9Sstevel@tonic-gate int r = 0; /* result */ 41047c478bd9Sstevel@tonic-gate 41057c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 41067c478bd9Sstevel@tonic-gate 41077c478bd9Sstevel@tonic-gate page_struct_lock(pp); 41087c478bd9Sstevel@tonic-gate ASSERT(pp->p_lckcnt != 0); 41097c478bd9Sstevel@tonic-gate 41107c478bd9Sstevel@tonic-gate if (pp->p_lckcnt == 1) { 41117c478bd9Sstevel@tonic-gate if (pp->p_cowcnt < (ushort_t)PAGE_LOCK_MAXIMUM) { 41127c478bd9Sstevel@tonic-gate --pp->p_lckcnt; 41137c478bd9Sstevel@tonic-gate r = 1; 41147c478bd9Sstevel@tonic-gate if (++pp->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 41157c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 41167c478bd9Sstevel@tonic-gate "COW lock limit reached on pfn 0x%lx", 41177c478bd9Sstevel@tonic-gate page_pptonum(pp)); 41187c478bd9Sstevel@tonic-gate } 41197c478bd9Sstevel@tonic-gate } 41207c478bd9Sstevel@tonic-gate } else { 41217c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 41227c478bd9Sstevel@tonic-gate if ((availrmem > pages_pp_maximum) && 41237c478bd9Sstevel@tonic-gate (pp->p_cowcnt < (ushort_t)PAGE_LOCK_MAXIMUM)) { 41247c478bd9Sstevel@tonic-gate --availrmem; 41257c478bd9Sstevel@tonic-gate ++pages_claimed; 41267c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 41277c478bd9Sstevel@tonic-gate --pp->p_lckcnt; 41287c478bd9Sstevel@tonic-gate r = 1; 41297c478bd9Sstevel@tonic-gate if (++pp->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 41307c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 41317c478bd9Sstevel@tonic-gate "COW lock limit reached on pfn 0x%lx", 41327c478bd9Sstevel@tonic-gate page_pptonum(pp)); 41337c478bd9Sstevel@tonic-gate } 41347c478bd9Sstevel@tonic-gate } else 41357c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 41367c478bd9Sstevel@tonic-gate } 41377c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 41387c478bd9Sstevel@tonic-gate return (r); 41397c478bd9Sstevel@tonic-gate } 41407c478bd9Sstevel@tonic-gate 41417c478bd9Sstevel@tonic-gate int 41427c478bd9Sstevel@tonic-gate page_subclaim(page_t *pp) 41437c478bd9Sstevel@tonic-gate { 41447c478bd9Sstevel@tonic-gate int r = 0; 41457c478bd9Sstevel@tonic-gate 41467c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 41477c478bd9Sstevel@tonic-gate 41487c478bd9Sstevel@tonic-gate page_struct_lock(pp); 41497c478bd9Sstevel@tonic-gate ASSERT(pp->p_cowcnt != 0); 41507c478bd9Sstevel@tonic-gate 41517c478bd9Sstevel@tonic-gate if (pp->p_lckcnt) { 41527c478bd9Sstevel@tonic-gate if (pp->p_lckcnt < (ushort_t)PAGE_LOCK_MAXIMUM) { 41537c478bd9Sstevel@tonic-gate r = 1; 41547c478bd9Sstevel@tonic-gate /* 41557c478bd9Sstevel@tonic-gate * for availrmem 41567c478bd9Sstevel@tonic-gate */ 41577c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 41587c478bd9Sstevel@tonic-gate availrmem++; 41597c478bd9Sstevel@tonic-gate pages_claimed--; 41607c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 41617c478bd9Sstevel@tonic-gate 41627c478bd9Sstevel@tonic-gate pp->p_cowcnt--; 41637c478bd9Sstevel@tonic-gate 41647c478bd9Sstevel@tonic-gate if (++pp->p_lckcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 41657c478bd9Sstevel@tonic-gate cmn_err(CE_WARN, 41667c478bd9Sstevel@tonic-gate "Page lock limit reached on pfn 0x%lx", 41677c478bd9Sstevel@tonic-gate page_pptonum(pp)); 41687c478bd9Sstevel@tonic-gate } 41697c478bd9Sstevel@tonic-gate } 41707c478bd9Sstevel@tonic-gate } else { 41717c478bd9Sstevel@tonic-gate r = 1; 41727c478bd9Sstevel@tonic-gate pp->p_cowcnt--; 41737c478bd9Sstevel@tonic-gate pp->p_lckcnt++; 41747c478bd9Sstevel@tonic-gate } 41757c478bd9Sstevel@tonic-gate page_struct_unlock(pp); 41767c478bd9Sstevel@tonic-gate return (r); 41777c478bd9Sstevel@tonic-gate } 41787c478bd9Sstevel@tonic-gate 41797c478bd9Sstevel@tonic-gate int 41807c478bd9Sstevel@tonic-gate page_addclaim_pages(page_t **ppa) 41817c478bd9Sstevel@tonic-gate { 41827c478bd9Sstevel@tonic-gate 41837c478bd9Sstevel@tonic-gate pgcnt_t lckpgs = 0, pg_idx; 41847c478bd9Sstevel@tonic-gate 41857c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_addclaim_pages); 41867c478bd9Sstevel@tonic-gate 41877c478bd9Sstevel@tonic-gate mutex_enter(&page_llock); 41887c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 41897c478bd9Sstevel@tonic-gate 41907c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(ppa[pg_idx])); 41917c478bd9Sstevel@tonic-gate ASSERT(ppa[pg_idx]->p_lckcnt != 0); 41927c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_cowcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 41937c478bd9Sstevel@tonic-gate mutex_exit(&page_llock); 41947c478bd9Sstevel@tonic-gate return (0); 41957c478bd9Sstevel@tonic-gate } 41967c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_lckcnt > 1) 41977c478bd9Sstevel@tonic-gate lckpgs++; 41987c478bd9Sstevel@tonic-gate } 41997c478bd9Sstevel@tonic-gate 42007c478bd9Sstevel@tonic-gate if (lckpgs != 0) { 42017c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 42027c478bd9Sstevel@tonic-gate if (availrmem >= pages_pp_maximum + lckpgs) { 42037c478bd9Sstevel@tonic-gate availrmem -= lckpgs; 42047c478bd9Sstevel@tonic-gate pages_claimed += lckpgs; 42057c478bd9Sstevel@tonic-gate } else { 42067c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 42077c478bd9Sstevel@tonic-gate mutex_exit(&page_llock); 42087c478bd9Sstevel@tonic-gate return (0); 42097c478bd9Sstevel@tonic-gate } 42107c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 42117c478bd9Sstevel@tonic-gate } 42127c478bd9Sstevel@tonic-gate 42137c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 42147c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_lckcnt--; 42157c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_cowcnt++; 42167c478bd9Sstevel@tonic-gate } 42177c478bd9Sstevel@tonic-gate mutex_exit(&page_llock); 42187c478bd9Sstevel@tonic-gate return (1); 42197c478bd9Sstevel@tonic-gate } 42207c478bd9Sstevel@tonic-gate 42217c478bd9Sstevel@tonic-gate int 42227c478bd9Sstevel@tonic-gate page_subclaim_pages(page_t **ppa) 42237c478bd9Sstevel@tonic-gate { 42247c478bd9Sstevel@tonic-gate pgcnt_t ulckpgs = 0, pg_idx; 42257c478bd9Sstevel@tonic-gate 42267c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_subclaim_pages); 42277c478bd9Sstevel@tonic-gate 42287c478bd9Sstevel@tonic-gate mutex_enter(&page_llock); 42297c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 42307c478bd9Sstevel@tonic-gate 42317c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(ppa[pg_idx])); 42327c478bd9Sstevel@tonic-gate ASSERT(ppa[pg_idx]->p_cowcnt != 0); 42337c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_lckcnt == (ushort_t)PAGE_LOCK_MAXIMUM) { 42347c478bd9Sstevel@tonic-gate mutex_exit(&page_llock); 42357c478bd9Sstevel@tonic-gate return (0); 42367c478bd9Sstevel@tonic-gate } 42377c478bd9Sstevel@tonic-gate if (ppa[pg_idx]->p_lckcnt != 0) 42387c478bd9Sstevel@tonic-gate ulckpgs++; 42397c478bd9Sstevel@tonic-gate } 42407c478bd9Sstevel@tonic-gate 42417c478bd9Sstevel@tonic-gate if (ulckpgs != 0) { 42427c478bd9Sstevel@tonic-gate mutex_enter(&freemem_lock); 42437c478bd9Sstevel@tonic-gate availrmem += ulckpgs; 42447c478bd9Sstevel@tonic-gate pages_claimed -= ulckpgs; 42457c478bd9Sstevel@tonic-gate mutex_exit(&freemem_lock); 42467c478bd9Sstevel@tonic-gate } 42477c478bd9Sstevel@tonic-gate 42487c478bd9Sstevel@tonic-gate for (pg_idx = 0; ppa[pg_idx] != NULL; pg_idx++) { 42497c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_cowcnt--; 42507c478bd9Sstevel@tonic-gate ppa[pg_idx]->p_lckcnt++; 42517c478bd9Sstevel@tonic-gate 42527c478bd9Sstevel@tonic-gate } 42537c478bd9Sstevel@tonic-gate mutex_exit(&page_llock); 42547c478bd9Sstevel@tonic-gate return (1); 42557c478bd9Sstevel@tonic-gate } 42567c478bd9Sstevel@tonic-gate 42577c478bd9Sstevel@tonic-gate page_t * 42587c478bd9Sstevel@tonic-gate page_numtopp(pfn_t pfnum, se_t se) 42597c478bd9Sstevel@tonic-gate { 42607c478bd9Sstevel@tonic-gate page_t *pp; 42617c478bd9Sstevel@tonic-gate 42627c478bd9Sstevel@tonic-gate retry: 42637c478bd9Sstevel@tonic-gate pp = page_numtopp_nolock(pfnum); 42647c478bd9Sstevel@tonic-gate if (pp == NULL) { 42657c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 42667c478bd9Sstevel@tonic-gate } 42677c478bd9Sstevel@tonic-gate 42687c478bd9Sstevel@tonic-gate /* 42697c478bd9Sstevel@tonic-gate * Acquire the appropriate lock on the page. 42707c478bd9Sstevel@tonic-gate */ 42717c478bd9Sstevel@tonic-gate while (!page_lock(pp, se, (kmutex_t *)NULL, P_RECLAIM)) { 42727c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) 42737c478bd9Sstevel@tonic-gate goto retry; 42747c478bd9Sstevel@tonic-gate continue; 42757c478bd9Sstevel@tonic-gate } 42767c478bd9Sstevel@tonic-gate 42777c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) { 42787c478bd9Sstevel@tonic-gate page_unlock(pp); 42797c478bd9Sstevel@tonic-gate goto retry; 42807c478bd9Sstevel@tonic-gate } 42817c478bd9Sstevel@tonic-gate 42827c478bd9Sstevel@tonic-gate return (pp); 42837c478bd9Sstevel@tonic-gate } 42847c478bd9Sstevel@tonic-gate 42857c478bd9Sstevel@tonic-gate page_t * 42867c478bd9Sstevel@tonic-gate page_numtopp_noreclaim(pfn_t pfnum, se_t se) 42877c478bd9Sstevel@tonic-gate { 42887c478bd9Sstevel@tonic-gate page_t *pp; 42897c478bd9Sstevel@tonic-gate 42907c478bd9Sstevel@tonic-gate retry: 42917c478bd9Sstevel@tonic-gate pp = page_numtopp_nolock(pfnum); 42927c478bd9Sstevel@tonic-gate if (pp == NULL) { 42937c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 42947c478bd9Sstevel@tonic-gate } 42957c478bd9Sstevel@tonic-gate 42967c478bd9Sstevel@tonic-gate /* 42977c478bd9Sstevel@tonic-gate * Acquire the appropriate lock on the page. 42987c478bd9Sstevel@tonic-gate */ 42997c478bd9Sstevel@tonic-gate while (!page_lock(pp, se, (kmutex_t *)NULL, P_NO_RECLAIM)) { 43007c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) 43017c478bd9Sstevel@tonic-gate goto retry; 43027c478bd9Sstevel@tonic-gate continue; 43037c478bd9Sstevel@tonic-gate } 43047c478bd9Sstevel@tonic-gate 43057c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) { 43067c478bd9Sstevel@tonic-gate page_unlock(pp); 43077c478bd9Sstevel@tonic-gate goto retry; 43087c478bd9Sstevel@tonic-gate } 43097c478bd9Sstevel@tonic-gate 43107c478bd9Sstevel@tonic-gate return (pp); 43117c478bd9Sstevel@tonic-gate } 43127c478bd9Sstevel@tonic-gate 43137c478bd9Sstevel@tonic-gate /* 43147c478bd9Sstevel@tonic-gate * This routine is like page_numtopp, but will only return page structs 43157c478bd9Sstevel@tonic-gate * for pages which are ok for loading into hardware using the page struct. 43167c478bd9Sstevel@tonic-gate */ 43177c478bd9Sstevel@tonic-gate page_t * 43187c478bd9Sstevel@tonic-gate page_numtopp_nowait(pfn_t pfnum, se_t se) 43197c478bd9Sstevel@tonic-gate { 43207c478bd9Sstevel@tonic-gate page_t *pp; 43217c478bd9Sstevel@tonic-gate 43227c478bd9Sstevel@tonic-gate retry: 43237c478bd9Sstevel@tonic-gate pp = page_numtopp_nolock(pfnum); 43247c478bd9Sstevel@tonic-gate if (pp == NULL) { 43257c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 43267c478bd9Sstevel@tonic-gate } 43277c478bd9Sstevel@tonic-gate 43287c478bd9Sstevel@tonic-gate /* 43297c478bd9Sstevel@tonic-gate * Try to acquire the appropriate lock on the page. 43307c478bd9Sstevel@tonic-gate */ 43317c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) 43327c478bd9Sstevel@tonic-gate pp = NULL; 43337c478bd9Sstevel@tonic-gate else { 43347c478bd9Sstevel@tonic-gate if (!page_trylock(pp, se)) 43357c478bd9Sstevel@tonic-gate pp = NULL; 43367c478bd9Sstevel@tonic-gate else { 43377c478bd9Sstevel@tonic-gate if (page_pptonum(pp) != pfnum) { 43387c478bd9Sstevel@tonic-gate page_unlock(pp); 43397c478bd9Sstevel@tonic-gate goto retry; 43407c478bd9Sstevel@tonic-gate } 43417c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp)) { 43427c478bd9Sstevel@tonic-gate page_unlock(pp); 43437c478bd9Sstevel@tonic-gate pp = NULL; 43447c478bd9Sstevel@tonic-gate } 43457c478bd9Sstevel@tonic-gate } 43467c478bd9Sstevel@tonic-gate } 43477c478bd9Sstevel@tonic-gate return (pp); 43487c478bd9Sstevel@tonic-gate } 43497c478bd9Sstevel@tonic-gate 43507c478bd9Sstevel@tonic-gate /* 43517c478bd9Sstevel@tonic-gate * Returns a count of dirty pages that are in the process 43527c478bd9Sstevel@tonic-gate * of being written out. If 'cleanit' is set, try to push the page. 43537c478bd9Sstevel@tonic-gate */ 43547c478bd9Sstevel@tonic-gate pgcnt_t 43557c478bd9Sstevel@tonic-gate page_busy(int cleanit) 43567c478bd9Sstevel@tonic-gate { 43577c478bd9Sstevel@tonic-gate page_t *page0 = page_first(); 43587c478bd9Sstevel@tonic-gate page_t *pp = page0; 43597c478bd9Sstevel@tonic-gate pgcnt_t nppbusy = 0; 43607c478bd9Sstevel@tonic-gate u_offset_t off; 43617c478bd9Sstevel@tonic-gate 43627c478bd9Sstevel@tonic-gate do { 43637c478bd9Sstevel@tonic-gate vnode_t *vp = pp->p_vnode; 43647c478bd9Sstevel@tonic-gate 43657c478bd9Sstevel@tonic-gate /* 43667c478bd9Sstevel@tonic-gate * A page is a candidate for syncing if it is: 43677c478bd9Sstevel@tonic-gate * 43687c478bd9Sstevel@tonic-gate * (a) On neither the freelist nor the cachelist 43697c478bd9Sstevel@tonic-gate * (b) Hashed onto a vnode 43707c478bd9Sstevel@tonic-gate * (c) Not a kernel page 43717c478bd9Sstevel@tonic-gate * (d) Dirty 43727c478bd9Sstevel@tonic-gate * (e) Not part of a swapfile 43737c478bd9Sstevel@tonic-gate * (f) a page which belongs to a real vnode; eg has a non-null 43747c478bd9Sstevel@tonic-gate * v_vfsp pointer. 43757c478bd9Sstevel@tonic-gate * (g) Backed by a filesystem which doesn't have a 43767c478bd9Sstevel@tonic-gate * stubbed-out sync operation 43777c478bd9Sstevel@tonic-gate */ 43787c478bd9Sstevel@tonic-gate if (!PP_ISFREE(pp) && vp != NULL && vp != &kvp && 43797c478bd9Sstevel@tonic-gate hat_ismod(pp) && !IS_SWAPVP(vp) && vp->v_vfsp != NULL && 43807c478bd9Sstevel@tonic-gate vfs_can_sync(vp->v_vfsp)) { 43817c478bd9Sstevel@tonic-gate nppbusy++; 43827c478bd9Sstevel@tonic-gate vfs_syncprogress(); 43837c478bd9Sstevel@tonic-gate 43847c478bd9Sstevel@tonic-gate if (!cleanit) 43857c478bd9Sstevel@tonic-gate continue; 43867c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) 43877c478bd9Sstevel@tonic-gate continue; 43887c478bd9Sstevel@tonic-gate 43897c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp) || vp == NULL || IS_SWAPVP(vp) || 43907c478bd9Sstevel@tonic-gate pp->p_lckcnt != 0 || pp->p_cowcnt != 0 || 43917c478bd9Sstevel@tonic-gate !(hat_pagesync(pp, 43927c478bd9Sstevel@tonic-gate HAT_SYNC_DONTZERO | HAT_SYNC_STOPON_MOD) & P_MOD)) { 43937c478bd9Sstevel@tonic-gate page_unlock(pp); 43947c478bd9Sstevel@tonic-gate continue; 43957c478bd9Sstevel@tonic-gate } 43967c478bd9Sstevel@tonic-gate off = pp->p_offset; 43977c478bd9Sstevel@tonic-gate VN_HOLD(vp); 43987c478bd9Sstevel@tonic-gate page_unlock(pp); 43997c478bd9Sstevel@tonic-gate (void) VOP_PUTPAGE(vp, off, PAGESIZE, 44007c478bd9Sstevel@tonic-gate B_ASYNC | B_FREE, kcred); 44017c478bd9Sstevel@tonic-gate VN_RELE(vp); 44027c478bd9Sstevel@tonic-gate } 44037c478bd9Sstevel@tonic-gate } while ((pp = page_next(pp)) != page0); 44047c478bd9Sstevel@tonic-gate 44057c478bd9Sstevel@tonic-gate return (nppbusy); 44067c478bd9Sstevel@tonic-gate } 44077c478bd9Sstevel@tonic-gate 44087c478bd9Sstevel@tonic-gate void page_invalidate_pages(void); 44097c478bd9Sstevel@tonic-gate 44107c478bd9Sstevel@tonic-gate /* 44117c478bd9Sstevel@tonic-gate * callback handler to vm sub-system 44127c478bd9Sstevel@tonic-gate * 44137c478bd9Sstevel@tonic-gate * callers make sure no recursive entries to this func. 44147c478bd9Sstevel@tonic-gate */ 44157c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 44167c478bd9Sstevel@tonic-gate boolean_t 44177c478bd9Sstevel@tonic-gate callb_vm_cpr(void *arg, int code) 44187c478bd9Sstevel@tonic-gate { 44197c478bd9Sstevel@tonic-gate if (code == CB_CODE_CPR_CHKPT) 44207c478bd9Sstevel@tonic-gate page_invalidate_pages(); 44217c478bd9Sstevel@tonic-gate return (B_TRUE); 44227c478bd9Sstevel@tonic-gate } 44237c478bd9Sstevel@tonic-gate 44247c478bd9Sstevel@tonic-gate /* 44257c478bd9Sstevel@tonic-gate * Invalidate all pages of the system. 44267c478bd9Sstevel@tonic-gate * It shouldn't be called until all user page activities are all stopped. 44277c478bd9Sstevel@tonic-gate */ 44287c478bd9Sstevel@tonic-gate void 44297c478bd9Sstevel@tonic-gate page_invalidate_pages() 44307c478bd9Sstevel@tonic-gate { 44317c478bd9Sstevel@tonic-gate page_t *pp; 44327c478bd9Sstevel@tonic-gate page_t *page0; 44337c478bd9Sstevel@tonic-gate pgcnt_t nbusypages; 44347c478bd9Sstevel@tonic-gate int retry = 0; 44357c478bd9Sstevel@tonic-gate const int MAXRETRIES = 4; 44367c478bd9Sstevel@tonic-gate #if defined(__sparc) 44377c478bd9Sstevel@tonic-gate extern struct vnode prom_ppages; 44387c478bd9Sstevel@tonic-gate #endif /* __sparc */ 44397c478bd9Sstevel@tonic-gate 44407c478bd9Sstevel@tonic-gate top: 44417c478bd9Sstevel@tonic-gate /* 44427c478bd9Sstevel@tonic-gate * Flush dirty pages and destory the clean ones. 44437c478bd9Sstevel@tonic-gate */ 44447c478bd9Sstevel@tonic-gate nbusypages = 0; 44457c478bd9Sstevel@tonic-gate 44467c478bd9Sstevel@tonic-gate pp = page0 = page_first(); 44477c478bd9Sstevel@tonic-gate do { 44487c478bd9Sstevel@tonic-gate struct vnode *vp; 44497c478bd9Sstevel@tonic-gate u_offset_t offset; 44507c478bd9Sstevel@tonic-gate int mod; 44517c478bd9Sstevel@tonic-gate 44527c478bd9Sstevel@tonic-gate /* 44537c478bd9Sstevel@tonic-gate * skip the page if it has no vnode or the page associated 44547c478bd9Sstevel@tonic-gate * with the kernel vnode or prom allocated kernel mem. 44557c478bd9Sstevel@tonic-gate */ 44567c478bd9Sstevel@tonic-gate #if defined(__sparc) 44577c478bd9Sstevel@tonic-gate if ((vp = pp->p_vnode) == NULL || vp == &kvp || 44587c478bd9Sstevel@tonic-gate vp == &prom_ppages) 44597c478bd9Sstevel@tonic-gate #else /* x86 doesn't have prom or prom_ppage */ 44607c478bd9Sstevel@tonic-gate if ((vp = pp->p_vnode) == NULL || vp == &kvp) 44617c478bd9Sstevel@tonic-gate #endif /* __sparc */ 44627c478bd9Sstevel@tonic-gate continue; 44637c478bd9Sstevel@tonic-gate 44647c478bd9Sstevel@tonic-gate /* 44657c478bd9Sstevel@tonic-gate * skip the page which is already free invalidated. 44667c478bd9Sstevel@tonic-gate */ 44677c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp) && PP_ISAGED(pp)) 44687c478bd9Sstevel@tonic-gate continue; 44697c478bd9Sstevel@tonic-gate 44707c478bd9Sstevel@tonic-gate /* 44717c478bd9Sstevel@tonic-gate * skip pages that are already locked or can't be "exclusively" 44727c478bd9Sstevel@tonic-gate * locked or are already free. After we lock the page, check 44737c478bd9Sstevel@tonic-gate * the free and age bits again to be sure it's not destroied 44747c478bd9Sstevel@tonic-gate * yet. 44757c478bd9Sstevel@tonic-gate * To achieve max. parallelization, we use page_trylock instead 44767c478bd9Sstevel@tonic-gate * of page_lock so that we don't get block on individual pages 44777c478bd9Sstevel@tonic-gate * while we have thousands of other pages to process. 44787c478bd9Sstevel@tonic-gate */ 44797c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) { 44807c478bd9Sstevel@tonic-gate nbusypages++; 44817c478bd9Sstevel@tonic-gate continue; 44827c478bd9Sstevel@tonic-gate } else if (PP_ISFREE(pp)) { 44837c478bd9Sstevel@tonic-gate if (!PP_ISAGED(pp)) { 44847c478bd9Sstevel@tonic-gate page_destroy_free(pp); 44857c478bd9Sstevel@tonic-gate } else { 44867c478bd9Sstevel@tonic-gate page_unlock(pp); 44877c478bd9Sstevel@tonic-gate } 44887c478bd9Sstevel@tonic-gate continue; 44897c478bd9Sstevel@tonic-gate } 44907c478bd9Sstevel@tonic-gate /* 44917c478bd9Sstevel@tonic-gate * Is this page involved in some I/O? shared? 44927c478bd9Sstevel@tonic-gate * 44937c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired to 44947c478bd9Sstevel@tonic-gate * examine these fields since the page has an 44957c478bd9Sstevel@tonic-gate * "exclusive" lock. 44967c478bd9Sstevel@tonic-gate */ 44977c478bd9Sstevel@tonic-gate if (pp->p_lckcnt != 0 || pp->p_cowcnt != 0) { 44987c478bd9Sstevel@tonic-gate page_unlock(pp); 44997c478bd9Sstevel@tonic-gate continue; 45007c478bd9Sstevel@tonic-gate } 45017c478bd9Sstevel@tonic-gate 45027c478bd9Sstevel@tonic-gate if (vp->v_type == VCHR) { 45037c478bd9Sstevel@tonic-gate panic("vp->v_type == VCHR"); 45047c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 45057c478bd9Sstevel@tonic-gate } 45067c478bd9Sstevel@tonic-gate 45077c478bd9Sstevel@tonic-gate if (!page_try_demote_pages(pp)) { 45087c478bd9Sstevel@tonic-gate page_unlock(pp); 45097c478bd9Sstevel@tonic-gate continue; 45107c478bd9Sstevel@tonic-gate } 45117c478bd9Sstevel@tonic-gate 45127c478bd9Sstevel@tonic-gate /* 45137c478bd9Sstevel@tonic-gate * Check the modified bit. Leave the bits alone in hardware 45147c478bd9Sstevel@tonic-gate * (they will be modified if we do the putpage). 45157c478bd9Sstevel@tonic-gate */ 45167c478bd9Sstevel@tonic-gate mod = (hat_pagesync(pp, HAT_SYNC_DONTZERO | HAT_SYNC_STOPON_MOD) 45177c478bd9Sstevel@tonic-gate & P_MOD); 45187c478bd9Sstevel@tonic-gate if (mod) { 45197c478bd9Sstevel@tonic-gate offset = pp->p_offset; 45207c478bd9Sstevel@tonic-gate /* 45217c478bd9Sstevel@tonic-gate * Hold the vnode before releasing the page lock 45227c478bd9Sstevel@tonic-gate * to prevent it from being freed and re-used by 45237c478bd9Sstevel@tonic-gate * some other thread. 45247c478bd9Sstevel@tonic-gate */ 45257c478bd9Sstevel@tonic-gate VN_HOLD(vp); 45267c478bd9Sstevel@tonic-gate page_unlock(pp); 45277c478bd9Sstevel@tonic-gate /* 45287c478bd9Sstevel@tonic-gate * No error return is checked here. Callers such as 45297c478bd9Sstevel@tonic-gate * cpr deals with the dirty pages at the dump time 45307c478bd9Sstevel@tonic-gate * if this putpage fails. 45317c478bd9Sstevel@tonic-gate */ 45327c478bd9Sstevel@tonic-gate (void) VOP_PUTPAGE(vp, offset, PAGESIZE, B_INVAL, 45337c478bd9Sstevel@tonic-gate kcred); 45347c478bd9Sstevel@tonic-gate VN_RELE(vp); 45357c478bd9Sstevel@tonic-gate } else { 45367c478bd9Sstevel@tonic-gate page_destroy(pp, 0); 45377c478bd9Sstevel@tonic-gate } 45387c478bd9Sstevel@tonic-gate } while ((pp = page_next(pp)) != page0); 45397c478bd9Sstevel@tonic-gate if (nbusypages && retry++ < MAXRETRIES) { 45407c478bd9Sstevel@tonic-gate delay(1); 45417c478bd9Sstevel@tonic-gate goto top; 45427c478bd9Sstevel@tonic-gate } 45437c478bd9Sstevel@tonic-gate } 45447c478bd9Sstevel@tonic-gate 45457c478bd9Sstevel@tonic-gate /* 45467c478bd9Sstevel@tonic-gate * Replace the page "old" with the page "new" on the page hash and vnode lists 45477c478bd9Sstevel@tonic-gate * 45487c478bd9Sstevel@tonic-gate * the replacemnt must be done in place, ie the equivalent sequence: 45497c478bd9Sstevel@tonic-gate * 45507c478bd9Sstevel@tonic-gate * vp = old->p_vnode; 45517c478bd9Sstevel@tonic-gate * off = old->p_offset; 45527c478bd9Sstevel@tonic-gate * page_do_hashout(old) 45537c478bd9Sstevel@tonic-gate * page_do_hashin(new, vp, off) 45547c478bd9Sstevel@tonic-gate * 45557c478bd9Sstevel@tonic-gate * doesn't work, since 45567c478bd9Sstevel@tonic-gate * 1) if old is the only page on the vnode, the v_pages list has a window 45577c478bd9Sstevel@tonic-gate * where it looks empty. This will break file system assumptions. 45587c478bd9Sstevel@tonic-gate * and 45597c478bd9Sstevel@tonic-gate * 2) pvn_vplist_dirty() can't deal with pages moving on the v_pages list. 45607c478bd9Sstevel@tonic-gate */ 45617c478bd9Sstevel@tonic-gate static void 45627c478bd9Sstevel@tonic-gate page_do_relocate_hash(page_t *new, page_t *old) 45637c478bd9Sstevel@tonic-gate { 45647c478bd9Sstevel@tonic-gate page_t **hash_list; 45657c478bd9Sstevel@tonic-gate vnode_t *vp = old->p_vnode; 45667c478bd9Sstevel@tonic-gate kmutex_t *sep; 45677c478bd9Sstevel@tonic-gate 45687c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(old)); 45697c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(new)); 45707c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 45717c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(page_vnode_mutex(vp))); 45727c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(PAGE_HASH_MUTEX(PAGE_HASH_FUNC(vp, old->p_offset)))); 45737c478bd9Sstevel@tonic-gate 45747c478bd9Sstevel@tonic-gate /* 45757c478bd9Sstevel@tonic-gate * First find old page on the page hash list 45767c478bd9Sstevel@tonic-gate */ 45777c478bd9Sstevel@tonic-gate hash_list = &page_hash[PAGE_HASH_FUNC(vp, old->p_offset)]; 45787c478bd9Sstevel@tonic-gate 45797c478bd9Sstevel@tonic-gate for (;;) { 45807c478bd9Sstevel@tonic-gate if (*hash_list == old) 45817c478bd9Sstevel@tonic-gate break; 45827c478bd9Sstevel@tonic-gate if (*hash_list == NULL) { 45837c478bd9Sstevel@tonic-gate panic("page_do_hashout"); 45847c478bd9Sstevel@tonic-gate /*NOTREACHED*/ 45857c478bd9Sstevel@tonic-gate } 45867c478bd9Sstevel@tonic-gate hash_list = &(*hash_list)->p_hash; 45877c478bd9Sstevel@tonic-gate } 45887c478bd9Sstevel@tonic-gate 45897c478bd9Sstevel@tonic-gate /* 45907c478bd9Sstevel@tonic-gate * update new and replace old with new on the page hash list 45917c478bd9Sstevel@tonic-gate */ 45927c478bd9Sstevel@tonic-gate new->p_vnode = old->p_vnode; 45937c478bd9Sstevel@tonic-gate new->p_offset = old->p_offset; 45947c478bd9Sstevel@tonic-gate new->p_hash = old->p_hash; 45957c478bd9Sstevel@tonic-gate *hash_list = new; 45967c478bd9Sstevel@tonic-gate 45977c478bd9Sstevel@tonic-gate if ((new->p_vnode->v_flag & VISSWAP) != 0) 45987c478bd9Sstevel@tonic-gate PP_SETSWAP(new); 45997c478bd9Sstevel@tonic-gate 46007c478bd9Sstevel@tonic-gate /* 46017c478bd9Sstevel@tonic-gate * replace old with new on the vnode's page list 46027c478bd9Sstevel@tonic-gate */ 46037c478bd9Sstevel@tonic-gate if (old->p_vpnext == old) { 46047c478bd9Sstevel@tonic-gate new->p_vpnext = new; 46057c478bd9Sstevel@tonic-gate new->p_vpprev = new; 46067c478bd9Sstevel@tonic-gate } else { 46077c478bd9Sstevel@tonic-gate new->p_vpnext = old->p_vpnext; 46087c478bd9Sstevel@tonic-gate new->p_vpprev = old->p_vpprev; 46097c478bd9Sstevel@tonic-gate new->p_vpnext->p_vpprev = new; 46107c478bd9Sstevel@tonic-gate new->p_vpprev->p_vpnext = new; 46117c478bd9Sstevel@tonic-gate } 46127c478bd9Sstevel@tonic-gate if (vp->v_pages == old) 46137c478bd9Sstevel@tonic-gate vp->v_pages = new; 46147c478bd9Sstevel@tonic-gate 46157c478bd9Sstevel@tonic-gate /* 46167c478bd9Sstevel@tonic-gate * clear out the old page 46177c478bd9Sstevel@tonic-gate */ 46187c478bd9Sstevel@tonic-gate old->p_hash = NULL; 46197c478bd9Sstevel@tonic-gate old->p_vpnext = NULL; 46207c478bd9Sstevel@tonic-gate old->p_vpprev = NULL; 46217c478bd9Sstevel@tonic-gate old->p_vnode = NULL; 46227c478bd9Sstevel@tonic-gate PP_CLRSWAP(old); 46237c478bd9Sstevel@tonic-gate old->p_offset = (u_offset_t)-1; 46247c478bd9Sstevel@tonic-gate page_clr_all_props(old); 46257c478bd9Sstevel@tonic-gate 46267c478bd9Sstevel@tonic-gate /* 46277c478bd9Sstevel@tonic-gate * Wake up processes waiting for this page. The page's 46287c478bd9Sstevel@tonic-gate * identity has been changed, and is probably not the 46297c478bd9Sstevel@tonic-gate * desired page any longer. 46307c478bd9Sstevel@tonic-gate */ 46317c478bd9Sstevel@tonic-gate sep = page_se_mutex(old); 46327c478bd9Sstevel@tonic-gate mutex_enter(sep); 463342787a71Sstans old->p_selock &= ~SE_EWANTED; 46347c478bd9Sstevel@tonic-gate if (CV_HAS_WAITERS(&old->p_cv)) 46357c478bd9Sstevel@tonic-gate cv_broadcast(&old->p_cv); 46367c478bd9Sstevel@tonic-gate mutex_exit(sep); 46377c478bd9Sstevel@tonic-gate } 46387c478bd9Sstevel@tonic-gate 46397c478bd9Sstevel@tonic-gate /* 46407c478bd9Sstevel@tonic-gate * This function moves the identity of page "pp_old" to page "pp_new". 46417c478bd9Sstevel@tonic-gate * Both pages must be locked on entry. "pp_new" is free, has no identity, 46427c478bd9Sstevel@tonic-gate * and need not be hashed out from anywhere. 46437c478bd9Sstevel@tonic-gate */ 46447c478bd9Sstevel@tonic-gate void 46457c478bd9Sstevel@tonic-gate page_relocate_hash(page_t *pp_new, page_t *pp_old) 46467c478bd9Sstevel@tonic-gate { 46477c478bd9Sstevel@tonic-gate vnode_t *vp = pp_old->p_vnode; 46487c478bd9Sstevel@tonic-gate u_offset_t off = pp_old->p_offset; 46497c478bd9Sstevel@tonic-gate kmutex_t *phm, *vphm; 46507c478bd9Sstevel@tonic-gate 46517c478bd9Sstevel@tonic-gate /* 46527c478bd9Sstevel@tonic-gate * Rehash two pages 46537c478bd9Sstevel@tonic-gate */ 46547c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp_old)); 46557c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp_new)); 46567c478bd9Sstevel@tonic-gate ASSERT(vp != NULL); 46577c478bd9Sstevel@tonic-gate ASSERT(pp_new->p_vnode == NULL); 46587c478bd9Sstevel@tonic-gate 46597c478bd9Sstevel@tonic-gate /* 46607c478bd9Sstevel@tonic-gate * hashout then hashin while holding the mutexes 46617c478bd9Sstevel@tonic-gate */ 46627c478bd9Sstevel@tonic-gate phm = PAGE_HASH_MUTEX(PAGE_HASH_FUNC(vp, off)); 46637c478bd9Sstevel@tonic-gate mutex_enter(phm); 46647c478bd9Sstevel@tonic-gate vphm = page_vnode_mutex(vp); 46657c478bd9Sstevel@tonic-gate mutex_enter(vphm); 46667c478bd9Sstevel@tonic-gate 46677c478bd9Sstevel@tonic-gate page_do_relocate_hash(pp_new, pp_old); 46687c478bd9Sstevel@tonic-gate 46697c478bd9Sstevel@tonic-gate mutex_exit(vphm); 46707c478bd9Sstevel@tonic-gate mutex_exit(phm); 46717c478bd9Sstevel@tonic-gate 46727c478bd9Sstevel@tonic-gate /* 46737c478bd9Sstevel@tonic-gate * The page_struct_lock need not be acquired for lckcnt and 46747c478bd9Sstevel@tonic-gate * cowcnt since the page has an "exclusive" lock. 46757c478bd9Sstevel@tonic-gate */ 46767c478bd9Sstevel@tonic-gate ASSERT(pp_new->p_lckcnt == 0); 46777c478bd9Sstevel@tonic-gate ASSERT(pp_new->p_cowcnt == 0); 46787c478bd9Sstevel@tonic-gate pp_new->p_lckcnt = pp_old->p_lckcnt; 46797c478bd9Sstevel@tonic-gate pp_new->p_cowcnt = pp_old->p_cowcnt; 46807c478bd9Sstevel@tonic-gate pp_old->p_lckcnt = pp_old->p_cowcnt = 0; 46817c478bd9Sstevel@tonic-gate 46827c478bd9Sstevel@tonic-gate /* The following comment preserved from page_flip(). */ 46837c478bd9Sstevel@tonic-gate /* XXX - Do we need to protect fsdata? */ 46847c478bd9Sstevel@tonic-gate pp_new->p_fsdata = pp_old->p_fsdata; 46857c478bd9Sstevel@tonic-gate } 46867c478bd9Sstevel@tonic-gate 46877c478bd9Sstevel@tonic-gate /* 46887c478bd9Sstevel@tonic-gate * Helper routine used to lock all remaining members of a 46897c478bd9Sstevel@tonic-gate * large page. The caller is responsible for passing in a locked 46907c478bd9Sstevel@tonic-gate * pp. If pp is a large page, then it succeeds in locking all the 46917c478bd9Sstevel@tonic-gate * remaining constituent pages or it returns with only the 46927c478bd9Sstevel@tonic-gate * original page locked. 46937c478bd9Sstevel@tonic-gate * 46947c478bd9Sstevel@tonic-gate * Returns 1 on success, 0 on failure. 46957c478bd9Sstevel@tonic-gate * 46967c478bd9Sstevel@tonic-gate * If success is returned this routine gurantees p_szc for all constituent 46977c478bd9Sstevel@tonic-gate * pages of a large page pp belongs to can't change. To achieve this we 46987c478bd9Sstevel@tonic-gate * recheck szc of pp after locking all constituent pages and retry if szc 46997c478bd9Sstevel@tonic-gate * changed (it could only decrease). Since hat_page_demote() needs an EXCL 47007c478bd9Sstevel@tonic-gate * lock on one of constituent pages it can't be running after all constituent 47017c478bd9Sstevel@tonic-gate * pages are locked. hat_page_demote() with a lock on a constituent page 47027c478bd9Sstevel@tonic-gate * outside of this large page (i.e. pp belonged to a larger large page) is 47037c478bd9Sstevel@tonic-gate * already done with all constituent pages of pp since the root's p_szc is 47047c478bd9Sstevel@tonic-gate * changed last. Thefore no need to synchronize with hat_page_demote() that 47057c478bd9Sstevel@tonic-gate * locked a constituent page outside of pp's current large page. 47067c478bd9Sstevel@tonic-gate */ 47077c478bd9Sstevel@tonic-gate #ifdef DEBUG 47087c478bd9Sstevel@tonic-gate uint32_t gpg_trylock_mtbf = 0; 47097c478bd9Sstevel@tonic-gate #endif 47107c478bd9Sstevel@tonic-gate 47117c478bd9Sstevel@tonic-gate int 47127c478bd9Sstevel@tonic-gate group_page_trylock(page_t *pp, se_t se) 47137c478bd9Sstevel@tonic-gate { 47147c478bd9Sstevel@tonic-gate page_t *tpp; 47157c478bd9Sstevel@tonic-gate pgcnt_t npgs, i, j; 47167c478bd9Sstevel@tonic-gate uint_t pszc = pp->p_szc; 47177c478bd9Sstevel@tonic-gate 47187c478bd9Sstevel@tonic-gate #ifdef DEBUG 47197c478bd9Sstevel@tonic-gate if (gpg_trylock_mtbf && !(gethrtime() % gpg_trylock_mtbf)) { 47207c478bd9Sstevel@tonic-gate return (0); 47217c478bd9Sstevel@tonic-gate } 47227c478bd9Sstevel@tonic-gate #endif 47237c478bd9Sstevel@tonic-gate 47247c478bd9Sstevel@tonic-gate if (pp != PP_GROUPLEADER(pp, pszc)) { 47257c478bd9Sstevel@tonic-gate return (0); 47267c478bd9Sstevel@tonic-gate } 47277c478bd9Sstevel@tonic-gate 47287c478bd9Sstevel@tonic-gate retry: 47297c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED_SE(pp, se)); 47307c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 47317c478bd9Sstevel@tonic-gate if (pszc == 0) { 47327c478bd9Sstevel@tonic-gate return (1); 47337c478bd9Sstevel@tonic-gate } 47347c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(pszc); 47357c478bd9Sstevel@tonic-gate tpp = pp + 1; 47367c478bd9Sstevel@tonic-gate for (i = 1; i < npgs; i++, tpp++) { 47377c478bd9Sstevel@tonic-gate if (!page_trylock(tpp, se)) { 47387c478bd9Sstevel@tonic-gate tpp = pp + 1; 47397c478bd9Sstevel@tonic-gate for (j = 1; j < i; j++, tpp++) { 47407c478bd9Sstevel@tonic-gate page_unlock(tpp); 47417c478bd9Sstevel@tonic-gate } 47427c478bd9Sstevel@tonic-gate return (0); 47437c478bd9Sstevel@tonic-gate } 47447c478bd9Sstevel@tonic-gate } 47457c478bd9Sstevel@tonic-gate if (pp->p_szc != pszc) { 47467c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc < pszc); 47477c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode != NULL && pp->p_vnode != &kvp && 47487c478bd9Sstevel@tonic-gate !IS_SWAPFSVP(pp->p_vnode)); 47497c478bd9Sstevel@tonic-gate tpp = pp + 1; 47507c478bd9Sstevel@tonic-gate for (i = 1; i < npgs; i++, tpp++) { 47517c478bd9Sstevel@tonic-gate page_unlock(tpp); 47527c478bd9Sstevel@tonic-gate } 47537c478bd9Sstevel@tonic-gate pszc = pp->p_szc; 47547c478bd9Sstevel@tonic-gate goto retry; 47557c478bd9Sstevel@tonic-gate } 47567c478bd9Sstevel@tonic-gate return (1); 47577c478bd9Sstevel@tonic-gate } 47587c478bd9Sstevel@tonic-gate 47597c478bd9Sstevel@tonic-gate void 47607c478bd9Sstevel@tonic-gate group_page_unlock(page_t *pp) 47617c478bd9Sstevel@tonic-gate { 47627c478bd9Sstevel@tonic-gate page_t *tpp; 47637c478bd9Sstevel@tonic-gate pgcnt_t npgs, i; 47647c478bd9Sstevel@tonic-gate 47657c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp)); 47667c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 47677c478bd9Sstevel@tonic-gate ASSERT(pp == PP_PAGEROOT(pp)); 47687c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(pp->p_szc); 47697c478bd9Sstevel@tonic-gate for (i = 1, tpp = pp + 1; i < npgs; i++, tpp++) { 47707c478bd9Sstevel@tonic-gate page_unlock(tpp); 47717c478bd9Sstevel@tonic-gate } 47727c478bd9Sstevel@tonic-gate } 47737c478bd9Sstevel@tonic-gate 47747c478bd9Sstevel@tonic-gate /* 47757c478bd9Sstevel@tonic-gate * returns 47767c478bd9Sstevel@tonic-gate * 0 : on success and *nrelocp is number of relocated PAGESIZE pages 47777c478bd9Sstevel@tonic-gate * ERANGE : this is not a base page 47787c478bd9Sstevel@tonic-gate * EBUSY : failure to get locks on the page/pages 47797c478bd9Sstevel@tonic-gate * ENOMEM : failure to obtain replacement pages 47807c478bd9Sstevel@tonic-gate * EAGAIN : OBP has not yet completed its boot-time handoff to the kernel 47817c478bd9Sstevel@tonic-gate * 47827c478bd9Sstevel@tonic-gate * Return with all constituent members of target and replacement 47837c478bd9Sstevel@tonic-gate * SE_EXCL locked. It is the callers responsibility to drop the 47847c478bd9Sstevel@tonic-gate * locks. 47857c478bd9Sstevel@tonic-gate */ 47867c478bd9Sstevel@tonic-gate int 47877c478bd9Sstevel@tonic-gate do_page_relocate( 47887c478bd9Sstevel@tonic-gate page_t **target, 47897c478bd9Sstevel@tonic-gate page_t **replacement, 47907c478bd9Sstevel@tonic-gate int grouplock, 47917c478bd9Sstevel@tonic-gate spgcnt_t *nrelocp, 47927c478bd9Sstevel@tonic-gate lgrp_t *lgrp) 47937c478bd9Sstevel@tonic-gate { 47947c478bd9Sstevel@tonic-gate #ifdef DEBUG 47957c478bd9Sstevel@tonic-gate page_t *first_repl; 47967c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 47977c478bd9Sstevel@tonic-gate page_t *repl; 47987c478bd9Sstevel@tonic-gate page_t *targ; 47997c478bd9Sstevel@tonic-gate page_t *pl = NULL; 48007c478bd9Sstevel@tonic-gate uint_t ppattr; 48017c478bd9Sstevel@tonic-gate pfn_t pfn, repl_pfn; 48027c478bd9Sstevel@tonic-gate uint_t szc; 48037c478bd9Sstevel@tonic-gate spgcnt_t npgs, i; 48047c478bd9Sstevel@tonic-gate int repl_contig = 0; 48057c478bd9Sstevel@tonic-gate uint_t flags = 0; 48067c478bd9Sstevel@tonic-gate spgcnt_t dofree = 0; 48077c478bd9Sstevel@tonic-gate 48087c478bd9Sstevel@tonic-gate *nrelocp = 0; 48097c478bd9Sstevel@tonic-gate 48107c478bd9Sstevel@tonic-gate #if defined(__sparc) 48117c478bd9Sstevel@tonic-gate /* 48127c478bd9Sstevel@tonic-gate * We need to wait till OBP has completed 48137c478bd9Sstevel@tonic-gate * its boot-time handoff of its resources to the kernel 48147c478bd9Sstevel@tonic-gate * before we allow page relocation 48157c478bd9Sstevel@tonic-gate */ 48167c478bd9Sstevel@tonic-gate if (page_relocate_ready == 0) { 48177c478bd9Sstevel@tonic-gate return (EAGAIN); 48187c478bd9Sstevel@tonic-gate } 48197c478bd9Sstevel@tonic-gate #endif 48207c478bd9Sstevel@tonic-gate 48217c478bd9Sstevel@tonic-gate /* 48227c478bd9Sstevel@tonic-gate * If this is not a base page, 48237c478bd9Sstevel@tonic-gate * just return with 0x0 pages relocated. 48247c478bd9Sstevel@tonic-gate */ 48257c478bd9Sstevel@tonic-gate targ = *target; 48267c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(targ)); 48277c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(targ)); 48287c478bd9Sstevel@tonic-gate szc = targ->p_szc; 48297c478bd9Sstevel@tonic-gate ASSERT(szc < mmu_page_sizes); 48307c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_reloc[szc]); 48317c478bd9Sstevel@tonic-gate pfn = targ->p_pagenum; 48327c478bd9Sstevel@tonic-gate if (pfn != PFN_BASE(pfn, szc)) { 48337c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnoroot[szc]); 48347c478bd9Sstevel@tonic-gate return (ERANGE); 48357c478bd9Sstevel@tonic-gate } 48367c478bd9Sstevel@tonic-gate 48377c478bd9Sstevel@tonic-gate if ((repl = *replacement) != NULL && repl->p_szc >= szc) { 48387c478bd9Sstevel@tonic-gate repl_pfn = repl->p_pagenum; 48397c478bd9Sstevel@tonic-gate if (repl_pfn != PFN_BASE(repl_pfn, szc)) { 48407c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_reloc_replnoroot[szc]); 48417c478bd9Sstevel@tonic-gate return (ERANGE); 48427c478bd9Sstevel@tonic-gate } 48437c478bd9Sstevel@tonic-gate repl_contig = 1; 48447c478bd9Sstevel@tonic-gate } 48457c478bd9Sstevel@tonic-gate 48467c478bd9Sstevel@tonic-gate /* 48477c478bd9Sstevel@tonic-gate * We must lock all members of this large page or we cannot 48487c478bd9Sstevel@tonic-gate * relocate any part of it. 48497c478bd9Sstevel@tonic-gate */ 48507c478bd9Sstevel@tonic-gate if (grouplock != 0 && !group_page_trylock(targ, SE_EXCL)) { 48517c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnolock[targ->p_szc]); 48527c478bd9Sstevel@tonic-gate return (EBUSY); 48537c478bd9Sstevel@tonic-gate } 48547c478bd9Sstevel@tonic-gate 48557c478bd9Sstevel@tonic-gate /* 48567c478bd9Sstevel@tonic-gate * reread szc it could have been decreased before 48577c478bd9Sstevel@tonic-gate * group_page_trylock() was done. 48587c478bd9Sstevel@tonic-gate */ 48597c478bd9Sstevel@tonic-gate szc = targ->p_szc; 48607c478bd9Sstevel@tonic-gate ASSERT(szc < mmu_page_sizes); 48617c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_reloc[szc]); 48627c478bd9Sstevel@tonic-gate ASSERT(pfn == PFN_BASE(pfn, szc)); 48637c478bd9Sstevel@tonic-gate 48647c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(targ->p_szc); 48657c478bd9Sstevel@tonic-gate 48667c478bd9Sstevel@tonic-gate if (repl == NULL) { 48677c478bd9Sstevel@tonic-gate dofree = npgs; /* Size of target page in MMU pages */ 48687c478bd9Sstevel@tonic-gate if (!page_create_wait(dofree, 0)) { 48697c478bd9Sstevel@tonic-gate if (grouplock != 0) { 48707c478bd9Sstevel@tonic-gate group_page_unlock(targ); 48717c478bd9Sstevel@tonic-gate } 48727c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnomem[szc]); 48737c478bd9Sstevel@tonic-gate return (ENOMEM); 48747c478bd9Sstevel@tonic-gate } 48757c478bd9Sstevel@tonic-gate 48767c478bd9Sstevel@tonic-gate /* 48777c478bd9Sstevel@tonic-gate * seg kmem pages require that the target and replacement 48787c478bd9Sstevel@tonic-gate * page be the same pagesize. 48797c478bd9Sstevel@tonic-gate */ 48807c478bd9Sstevel@tonic-gate flags = (targ->p_vnode == &kvp) ? PGR_SAMESZC : 0; 48817c478bd9Sstevel@tonic-gate repl = page_get_replacement_page(targ, lgrp, flags); 48827c478bd9Sstevel@tonic-gate if (repl == NULL) { 48837c478bd9Sstevel@tonic-gate if (grouplock != 0) { 48847c478bd9Sstevel@tonic-gate group_page_unlock(targ); 48857c478bd9Sstevel@tonic-gate } 48867c478bd9Sstevel@tonic-gate page_create_putback(dofree); 48877c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocnomem[szc]); 48887c478bd9Sstevel@tonic-gate return (ENOMEM); 48897c478bd9Sstevel@tonic-gate } 48907c478bd9Sstevel@tonic-gate } 48917c478bd9Sstevel@tonic-gate #ifdef DEBUG 48927c478bd9Sstevel@tonic-gate else { 48937c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(repl)); 48947c478bd9Sstevel@tonic-gate } 48957c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 48967c478bd9Sstevel@tonic-gate 48977c478bd9Sstevel@tonic-gate #if defined(__sparc) 48987c478bd9Sstevel@tonic-gate /* 48997c478bd9Sstevel@tonic-gate * Let hat_page_relocate() complete the relocation if it's kernel page 49007c478bd9Sstevel@tonic-gate */ 49017c478bd9Sstevel@tonic-gate if (targ->p_vnode == &kvp) { 49027c478bd9Sstevel@tonic-gate *replacement = repl; 49037c478bd9Sstevel@tonic-gate if (hat_page_relocate(target, replacement, nrelocp) != 0) { 49047c478bd9Sstevel@tonic-gate if (grouplock != 0) { 49057c478bd9Sstevel@tonic-gate group_page_unlock(targ); 49067c478bd9Sstevel@tonic-gate } 49077c478bd9Sstevel@tonic-gate if (dofree) { 49087c478bd9Sstevel@tonic-gate *replacement = NULL; 49097c478bd9Sstevel@tonic-gate page_free_replacement_page(repl); 49107c478bd9Sstevel@tonic-gate page_create_putback(dofree); 49117c478bd9Sstevel@tonic-gate } 49127c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_krelocfail[szc]); 49137c478bd9Sstevel@tonic-gate return (EAGAIN); 49147c478bd9Sstevel@tonic-gate } 49157c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocok[szc]); 49167c478bd9Sstevel@tonic-gate return (0); 49177c478bd9Sstevel@tonic-gate } 49187c478bd9Sstevel@tonic-gate #else 49197c478bd9Sstevel@tonic-gate #if defined(lint) 49207c478bd9Sstevel@tonic-gate dofree = dofree; 49217c478bd9Sstevel@tonic-gate #endif 49227c478bd9Sstevel@tonic-gate #endif 49237c478bd9Sstevel@tonic-gate 49247c478bd9Sstevel@tonic-gate #ifdef DEBUG 49257c478bd9Sstevel@tonic-gate first_repl = repl; 49267c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 49277c478bd9Sstevel@tonic-gate 49287c478bd9Sstevel@tonic-gate for (i = 0; i < npgs; i++) { 49297c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(targ)); 493007b65a64Saguzovsk ASSERT(targ->p_slckcnt == 0); 493107b65a64Saguzovsk ASSERT(repl->p_slckcnt == 0); 49327c478bd9Sstevel@tonic-gate 49337c478bd9Sstevel@tonic-gate (void) hat_pageunload(targ, HAT_FORCE_PGUNLOAD); 49347c478bd9Sstevel@tonic-gate 49357c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(targ) == 0); 49367c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(targ)); 49377c478bd9Sstevel@tonic-gate ASSERT(targ->p_pagenum == (pfn + i)); 49387c478bd9Sstevel@tonic-gate ASSERT(repl_contig == 0 || 49397c478bd9Sstevel@tonic-gate repl->p_pagenum == (repl_pfn + i)); 49407c478bd9Sstevel@tonic-gate 49417c478bd9Sstevel@tonic-gate /* 49427c478bd9Sstevel@tonic-gate * Copy the page contents and attributes then 49437c478bd9Sstevel@tonic-gate * relocate the page in the page hash. 49447c478bd9Sstevel@tonic-gate */ 49457c478bd9Sstevel@tonic-gate ppcopy(targ, repl); 49467c478bd9Sstevel@tonic-gate ppattr = hat_page_getattr(targ, (P_MOD | P_REF | P_RO)); 49477c478bd9Sstevel@tonic-gate page_clr_all_props(repl); 49487c478bd9Sstevel@tonic-gate page_set_props(repl, ppattr); 49497c478bd9Sstevel@tonic-gate page_relocate_hash(repl, targ); 49507c478bd9Sstevel@tonic-gate 49517c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(targ) == 0); 49527c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(repl) == 0); 49537c478bd9Sstevel@tonic-gate /* 49547c478bd9Sstevel@tonic-gate * Now clear the props on targ, after the 49557c478bd9Sstevel@tonic-gate * page_relocate_hash(), they no longer 49567c478bd9Sstevel@tonic-gate * have any meaning. 49577c478bd9Sstevel@tonic-gate */ 49587c478bd9Sstevel@tonic-gate page_clr_all_props(targ); 49597c478bd9Sstevel@tonic-gate ASSERT(targ->p_next == targ); 49607c478bd9Sstevel@tonic-gate ASSERT(targ->p_prev == targ); 49617c478bd9Sstevel@tonic-gate page_list_concat(&pl, &targ); 49627c478bd9Sstevel@tonic-gate 49637c478bd9Sstevel@tonic-gate targ++; 49647c478bd9Sstevel@tonic-gate if (repl_contig != 0) { 49657c478bd9Sstevel@tonic-gate repl++; 49667c478bd9Sstevel@tonic-gate } else { 49677c478bd9Sstevel@tonic-gate repl = repl->p_next; 49687c478bd9Sstevel@tonic-gate } 49697c478bd9Sstevel@tonic-gate } 49707c478bd9Sstevel@tonic-gate /* assert that we have come full circle with repl */ 49717c478bd9Sstevel@tonic-gate ASSERT(repl_contig == 1 || first_repl == repl); 49727c478bd9Sstevel@tonic-gate 49737c478bd9Sstevel@tonic-gate *target = pl; 49747c478bd9Sstevel@tonic-gate if (*replacement == NULL) { 49757c478bd9Sstevel@tonic-gate ASSERT(first_repl == repl); 49767c478bd9Sstevel@tonic-gate *replacement = repl; 49777c478bd9Sstevel@tonic-gate } 49787c478bd9Sstevel@tonic-gate VM_STAT_ADD(vmm_vmstats.ppr_relocok[szc]); 49797c478bd9Sstevel@tonic-gate *nrelocp = npgs; 49807c478bd9Sstevel@tonic-gate return (0); 49817c478bd9Sstevel@tonic-gate } 49827c478bd9Sstevel@tonic-gate /* 49837c478bd9Sstevel@tonic-gate * On success returns 0 and *nrelocp the number of PAGESIZE pages relocated. 49847c478bd9Sstevel@tonic-gate */ 49857c478bd9Sstevel@tonic-gate int 49867c478bd9Sstevel@tonic-gate page_relocate( 49877c478bd9Sstevel@tonic-gate page_t **target, 49887c478bd9Sstevel@tonic-gate page_t **replacement, 49897c478bd9Sstevel@tonic-gate int grouplock, 49907c478bd9Sstevel@tonic-gate int freetarget, 49917c478bd9Sstevel@tonic-gate spgcnt_t *nrelocp, 49927c478bd9Sstevel@tonic-gate lgrp_t *lgrp) 49937c478bd9Sstevel@tonic-gate { 49947c478bd9Sstevel@tonic-gate spgcnt_t ret; 49957c478bd9Sstevel@tonic-gate 49967c478bd9Sstevel@tonic-gate /* do_page_relocate returns 0 on success or errno value */ 49977c478bd9Sstevel@tonic-gate ret = do_page_relocate(target, replacement, grouplock, nrelocp, lgrp); 49987c478bd9Sstevel@tonic-gate 49997c478bd9Sstevel@tonic-gate if (ret != 0 || freetarget == 0) { 50007c478bd9Sstevel@tonic-gate return (ret); 50017c478bd9Sstevel@tonic-gate } 50027c478bd9Sstevel@tonic-gate if (*nrelocp == 1) { 50037c478bd9Sstevel@tonic-gate ASSERT(*target != NULL); 50047c478bd9Sstevel@tonic-gate page_free(*target, 1); 50057c478bd9Sstevel@tonic-gate } else { 50067c478bd9Sstevel@tonic-gate page_t *tpp = *target; 50077c478bd9Sstevel@tonic-gate uint_t szc = tpp->p_szc; 50087c478bd9Sstevel@tonic-gate pgcnt_t npgs = page_get_pagecnt(szc); 50097c478bd9Sstevel@tonic-gate ASSERT(npgs > 1); 50107c478bd9Sstevel@tonic-gate ASSERT(szc != 0); 50117c478bd9Sstevel@tonic-gate do { 50127c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 50137c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(tpp)); 50147c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == szc); 50157c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 50167c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 50177c478bd9Sstevel@tonic-gate npgs--; 50187c478bd9Sstevel@tonic-gate } while ((tpp = tpp->p_next) != *target); 50197c478bd9Sstevel@tonic-gate ASSERT(npgs == 0); 50207c478bd9Sstevel@tonic-gate page_list_add_pages(*target, 0); 50217c478bd9Sstevel@tonic-gate npgs = page_get_pagecnt(szc); 50227c478bd9Sstevel@tonic-gate page_create_putback(npgs); 50237c478bd9Sstevel@tonic-gate } 50247c478bd9Sstevel@tonic-gate return (ret); 50257c478bd9Sstevel@tonic-gate } 50267c478bd9Sstevel@tonic-gate 50277c478bd9Sstevel@tonic-gate /* 50287c478bd9Sstevel@tonic-gate * it is up to the caller to deal with pcf accounting. 50297c478bd9Sstevel@tonic-gate */ 50307c478bd9Sstevel@tonic-gate void 50317c478bd9Sstevel@tonic-gate page_free_replacement_page(page_t *pplist) 50327c478bd9Sstevel@tonic-gate { 50337c478bd9Sstevel@tonic-gate page_t *pp; 50347c478bd9Sstevel@tonic-gate 50357c478bd9Sstevel@tonic-gate while (pplist != NULL) { 50367c478bd9Sstevel@tonic-gate /* 50377c478bd9Sstevel@tonic-gate * pp_targ is a linked list. 50387c478bd9Sstevel@tonic-gate */ 50397c478bd9Sstevel@tonic-gate pp = pplist; 50407c478bd9Sstevel@tonic-gate if (pp->p_szc == 0) { 50417c478bd9Sstevel@tonic-gate page_sub(&pplist, pp); 50427c478bd9Sstevel@tonic-gate page_clr_all_props(pp); 50437c478bd9Sstevel@tonic-gate PP_SETFREE(pp); 50447c478bd9Sstevel@tonic-gate PP_SETAGED(pp); 50457c478bd9Sstevel@tonic-gate page_list_add(pp, PG_FREE_LIST | PG_LIST_TAIL); 50467c478bd9Sstevel@tonic-gate page_unlock(pp); 50477c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_replacement_page[0]); 50487c478bd9Sstevel@tonic-gate } else { 50497c478bd9Sstevel@tonic-gate spgcnt_t curnpgs = page_get_pagecnt(pp->p_szc); 50507c478bd9Sstevel@tonic-gate page_t *tpp; 50517c478bd9Sstevel@tonic-gate page_list_break(&pp, &pplist, curnpgs); 50527c478bd9Sstevel@tonic-gate tpp = pp; 50537c478bd9Sstevel@tonic-gate do { 50547c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 50557c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(tpp)); 50567c478bd9Sstevel@tonic-gate page_clr_all_props(pp); 50577c478bd9Sstevel@tonic-gate PP_SETFREE(tpp); 50587c478bd9Sstevel@tonic-gate PP_SETAGED(tpp); 50597c478bd9Sstevel@tonic-gate } while ((tpp = tpp->p_next) != pp); 50607c478bd9Sstevel@tonic-gate page_list_add_pages(pp, 0); 50617c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_free_replacement_page[1]); 50627c478bd9Sstevel@tonic-gate } 50637c478bd9Sstevel@tonic-gate } 50647c478bd9Sstevel@tonic-gate } 50657c478bd9Sstevel@tonic-gate 50667c478bd9Sstevel@tonic-gate /* 50677c478bd9Sstevel@tonic-gate * Relocate target to non-relocatable replacement page. 50687c478bd9Sstevel@tonic-gate */ 50697c478bd9Sstevel@tonic-gate int 50707c478bd9Sstevel@tonic-gate page_relocate_cage(page_t **target, page_t **replacement) 50717c478bd9Sstevel@tonic-gate { 50727c478bd9Sstevel@tonic-gate page_t *tpp, *rpp; 50737c478bd9Sstevel@tonic-gate spgcnt_t pgcnt, npgs; 50747c478bd9Sstevel@tonic-gate int result; 50757c478bd9Sstevel@tonic-gate 50767c478bd9Sstevel@tonic-gate tpp = *target; 50777c478bd9Sstevel@tonic-gate 50787c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 50797c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == 0); 50807c478bd9Sstevel@tonic-gate 50817c478bd9Sstevel@tonic-gate pgcnt = btop(page_get_pagesize(tpp->p_szc)); 50827c478bd9Sstevel@tonic-gate 50837c478bd9Sstevel@tonic-gate do { 50847c478bd9Sstevel@tonic-gate (void) page_create_wait(pgcnt, PG_WAIT | PG_NORELOC); 50857c478bd9Sstevel@tonic-gate rpp = page_get_replacement_page(tpp, NULL, PGR_NORELOC); 50867c478bd9Sstevel@tonic-gate if (rpp == NULL) { 50877c478bd9Sstevel@tonic-gate page_create_putback(pgcnt); 50887c478bd9Sstevel@tonic-gate kcage_cageout_wakeup(); 50897c478bd9Sstevel@tonic-gate } 50907c478bd9Sstevel@tonic-gate } while (rpp == NULL); 50917c478bd9Sstevel@tonic-gate 50927c478bd9Sstevel@tonic-gate ASSERT(PP_ISNORELOC(rpp)); 50937c478bd9Sstevel@tonic-gate 50947c478bd9Sstevel@tonic-gate result = page_relocate(&tpp, &rpp, 0, 1, &npgs, NULL); 50957c478bd9Sstevel@tonic-gate 50967c478bd9Sstevel@tonic-gate if (result == 0) { 50977c478bd9Sstevel@tonic-gate *replacement = rpp; 50987c478bd9Sstevel@tonic-gate if (pgcnt != npgs) 50997c478bd9Sstevel@tonic-gate panic("page_relocate_cage: partial relocation"); 51007c478bd9Sstevel@tonic-gate } 51017c478bd9Sstevel@tonic-gate 51027c478bd9Sstevel@tonic-gate return (result); 51037c478bd9Sstevel@tonic-gate } 51047c478bd9Sstevel@tonic-gate 51057c478bd9Sstevel@tonic-gate /* 51067c478bd9Sstevel@tonic-gate * Release the page lock on a page, place on cachelist 51077c478bd9Sstevel@tonic-gate * tail if no longer mapped. Caller can let us know if 51087c478bd9Sstevel@tonic-gate * the page is known to be clean. 51097c478bd9Sstevel@tonic-gate */ 51107c478bd9Sstevel@tonic-gate int 51117c478bd9Sstevel@tonic-gate page_release(page_t *pp, int checkmod) 51127c478bd9Sstevel@tonic-gate { 51137c478bd9Sstevel@tonic-gate int status; 51147c478bd9Sstevel@tonic-gate 51157c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(pp) && !PP_ISFREE(pp) && 51167c478bd9Sstevel@tonic-gate (pp->p_vnode != NULL)); 51177c478bd9Sstevel@tonic-gate 51187c478bd9Sstevel@tonic-gate if (!hat_page_is_mapped(pp) && !IS_SWAPVP(pp->p_vnode) && 51197c478bd9Sstevel@tonic-gate ((PAGE_SHARED(pp) && page_tryupgrade(pp)) || PAGE_EXCL(pp)) && 51207c478bd9Sstevel@tonic-gate pp->p_lckcnt == 0 && pp->p_cowcnt == 0 && 51217c478bd9Sstevel@tonic-gate !hat_page_is_mapped(pp)) { 51227c478bd9Sstevel@tonic-gate 51237c478bd9Sstevel@tonic-gate /* 51247c478bd9Sstevel@tonic-gate * If page is modified, unlock it 51257c478bd9Sstevel@tonic-gate * 51267c478bd9Sstevel@tonic-gate * (p_nrm & P_MOD) bit has the latest stuff because: 51277c478bd9Sstevel@tonic-gate * (1) We found that this page doesn't have any mappings 51287c478bd9Sstevel@tonic-gate * _after_ holding SE_EXCL and 51297c478bd9Sstevel@tonic-gate * (2) We didn't drop SE_EXCL lock after the check in (1) 51307c478bd9Sstevel@tonic-gate */ 51317c478bd9Sstevel@tonic-gate if (checkmod && hat_ismod(pp)) { 51327c478bd9Sstevel@tonic-gate page_unlock(pp); 51337c478bd9Sstevel@tonic-gate status = PGREL_MOD; 51347c478bd9Sstevel@tonic-gate } else { 51357c478bd9Sstevel@tonic-gate /*LINTED: constant in conditional context*/ 51367c478bd9Sstevel@tonic-gate VN_DISPOSE(pp, B_FREE, 0, kcred); 51377c478bd9Sstevel@tonic-gate status = PGREL_CLEAN; 51387c478bd9Sstevel@tonic-gate } 51397c478bd9Sstevel@tonic-gate } else { 51407c478bd9Sstevel@tonic-gate page_unlock(pp); 51417c478bd9Sstevel@tonic-gate status = PGREL_NOTREL; 51427c478bd9Sstevel@tonic-gate } 51437c478bd9Sstevel@tonic-gate return (status); 51447c478bd9Sstevel@tonic-gate } 51457c478bd9Sstevel@tonic-gate 5146db874c57Selowe /* 5147db874c57Selowe * Given a constituent page, try to demote the large page on the freelist. 5148db874c57Selowe * 5149db874c57Selowe * Returns nonzero if the page could be demoted successfully. Returns with 5150db874c57Selowe * the constituent page still locked. 5151db874c57Selowe */ 5152db874c57Selowe int 5153db874c57Selowe page_try_demote_free_pages(page_t *pp) 5154db874c57Selowe { 5155db874c57Selowe page_t *rootpp = pp; 5156db874c57Selowe pfn_t pfn = page_pptonum(pp); 5157db874c57Selowe spgcnt_t npgs; 5158db874c57Selowe uint_t szc = pp->p_szc; 5159db874c57Selowe 5160db874c57Selowe ASSERT(PP_ISFREE(pp)); 5161db874c57Selowe ASSERT(PAGE_EXCL(pp)); 5162db874c57Selowe 5163db874c57Selowe /* 5164db874c57Selowe * Adjust rootpp and lock it, if `pp' is not the base 5165db874c57Selowe * constituent page. 5166db874c57Selowe */ 5167db874c57Selowe npgs = page_get_pagecnt(pp->p_szc); 5168db874c57Selowe if (npgs == 1) { 5169db874c57Selowe return (0); 5170db874c57Selowe } 5171db874c57Selowe 5172db874c57Selowe if (!IS_P2ALIGNED(pfn, npgs)) { 5173db874c57Selowe pfn = P2ALIGN(pfn, npgs); 5174db874c57Selowe rootpp = page_numtopp_nolock(pfn); 5175db874c57Selowe } 5176db874c57Selowe 5177db874c57Selowe if (pp != rootpp && !page_trylock(rootpp, SE_EXCL)) { 5178db874c57Selowe return (0); 5179db874c57Selowe } 5180db874c57Selowe 5181db874c57Selowe if (rootpp->p_szc != szc) { 5182db874c57Selowe if (pp != rootpp) 5183db874c57Selowe page_unlock(rootpp); 5184db874c57Selowe return (0); 5185db874c57Selowe } 5186db874c57Selowe 5187db874c57Selowe page_demote_free_pages(rootpp); 5188db874c57Selowe 5189db874c57Selowe if (pp != rootpp) 5190db874c57Selowe page_unlock(rootpp); 5191db874c57Selowe 5192db874c57Selowe ASSERT(PP_ISFREE(pp)); 5193db874c57Selowe ASSERT(PAGE_EXCL(pp)); 5194db874c57Selowe return (1); 5195db874c57Selowe } 5196db874c57Selowe 5197db874c57Selowe /* 5198db874c57Selowe * Given a constituent page, try to demote the large page. 5199db874c57Selowe * 5200db874c57Selowe * Returns nonzero if the page could be demoted successfully. Returns with 5201db874c57Selowe * the constituent page still locked. 5202db874c57Selowe */ 52037c478bd9Sstevel@tonic-gate int 52047c478bd9Sstevel@tonic-gate page_try_demote_pages(page_t *pp) 52057c478bd9Sstevel@tonic-gate { 52067c478bd9Sstevel@tonic-gate page_t *tpp, *rootpp = pp; 52077c478bd9Sstevel@tonic-gate pfn_t pfn = page_pptonum(pp); 52087c478bd9Sstevel@tonic-gate spgcnt_t i, npgs; 52097c478bd9Sstevel@tonic-gate uint_t szc = pp->p_szc; 52107c478bd9Sstevel@tonic-gate vnode_t *vp = pp->p_vnode; 52117c478bd9Sstevel@tonic-gate 5212db874c57Selowe ASSERT(PAGE_EXCL(pp)); 52137c478bd9Sstevel@tonic-gate 52147c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[0]); 52157c478bd9Sstevel@tonic-gate 5216db874c57Selowe if (pp->p_szc == 0) { 52177c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[1]); 52187c478bd9Sstevel@tonic-gate return (1); 52197c478bd9Sstevel@tonic-gate } 52207c478bd9Sstevel@tonic-gate 52217c478bd9Sstevel@tonic-gate if (vp != NULL && !IS_SWAPFSVP(vp) && vp != &kvp) { 52227c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[2]); 5223db874c57Selowe page_demote_vp_pages(pp); 52247c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 52257c478bd9Sstevel@tonic-gate return (1); 52267c478bd9Sstevel@tonic-gate } 52277c478bd9Sstevel@tonic-gate 52287c478bd9Sstevel@tonic-gate /* 5229db874c57Selowe * Adjust rootpp if passed in is not the base 52307c478bd9Sstevel@tonic-gate * constituent page. 52317c478bd9Sstevel@tonic-gate */ 5232db874c57Selowe npgs = page_get_pagecnt(pp->p_szc); 52337c478bd9Sstevel@tonic-gate ASSERT(npgs > 1); 52347c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, npgs)) { 52357c478bd9Sstevel@tonic-gate pfn = P2ALIGN(pfn, npgs); 52367c478bd9Sstevel@tonic-gate rootpp = page_numtopp_nolock(pfn); 52377c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[3]); 52387c478bd9Sstevel@tonic-gate ASSERT(rootpp->p_vnode != NULL); 52397c478bd9Sstevel@tonic-gate ASSERT(rootpp->p_szc == szc); 52407c478bd9Sstevel@tonic-gate } 52417c478bd9Sstevel@tonic-gate 52427c478bd9Sstevel@tonic-gate /* 52437c478bd9Sstevel@tonic-gate * We can't demote kernel pages since we can't hat_unload() 52447c478bd9Sstevel@tonic-gate * the mappings. 52457c478bd9Sstevel@tonic-gate */ 52467c478bd9Sstevel@tonic-gate if (rootpp->p_vnode == &kvp) 52477c478bd9Sstevel@tonic-gate return (0); 52487c478bd9Sstevel@tonic-gate 52497c478bd9Sstevel@tonic-gate /* 52507c478bd9Sstevel@tonic-gate * Attempt to lock all constituent pages except the page passed 52517c478bd9Sstevel@tonic-gate * in since it's already locked. 52527c478bd9Sstevel@tonic-gate */ 5253affbd3ccSkchow for (tpp = rootpp, i = 0; i < npgs; i++, tpp++) { 52547c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(tpp)); 52557c478bd9Sstevel@tonic-gate ASSERT(tpp->p_vnode != NULL); 52567c478bd9Sstevel@tonic-gate 52577c478bd9Sstevel@tonic-gate if (tpp != pp && !page_trylock(tpp, SE_EXCL)) 52587c478bd9Sstevel@tonic-gate break; 52597c478bd9Sstevel@tonic-gate ASSERT(tpp->p_szc == rootpp->p_szc); 52607c478bd9Sstevel@tonic-gate ASSERT(page_pptonum(tpp) == page_pptonum(rootpp) + i); 52617c478bd9Sstevel@tonic-gate } 52627c478bd9Sstevel@tonic-gate 52637c478bd9Sstevel@tonic-gate /* 5264db874c57Selowe * If we failed to lock them all then unlock what we have 5265db874c57Selowe * locked so far and bail. 52667c478bd9Sstevel@tonic-gate */ 52677c478bd9Sstevel@tonic-gate if (i < npgs) { 52687c478bd9Sstevel@tonic-gate tpp = rootpp; 52697c478bd9Sstevel@tonic-gate while (i-- > 0) { 52707c478bd9Sstevel@tonic-gate if (tpp != pp) 52717c478bd9Sstevel@tonic-gate page_unlock(tpp); 5272affbd3ccSkchow tpp++; 52737c478bd9Sstevel@tonic-gate } 52747c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[4]); 52757c478bd9Sstevel@tonic-gate return (0); 52767c478bd9Sstevel@tonic-gate } 52777c478bd9Sstevel@tonic-gate 5278affbd3ccSkchow for (tpp = rootpp, i = 0; i < npgs; i++, tpp++) { 52797c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(tpp)); 528007b65a64Saguzovsk ASSERT(tpp->p_slckcnt == 0); 5281db874c57Selowe (void) hat_pageunload(tpp, HAT_FORCE_PGUNLOAD); 52827c478bd9Sstevel@tonic-gate tpp->p_szc = 0; 52837c478bd9Sstevel@tonic-gate } 52847c478bd9Sstevel@tonic-gate 52857c478bd9Sstevel@tonic-gate /* 52867c478bd9Sstevel@tonic-gate * Unlock all pages except the page passed in. 52877c478bd9Sstevel@tonic-gate */ 5288affbd3ccSkchow for (tpp = rootpp, i = 0; i < npgs; i++, tpp++) { 52897c478bd9Sstevel@tonic-gate ASSERT(!hat_page_is_mapped(tpp)); 52907c478bd9Sstevel@tonic-gate if (tpp != pp) 52917c478bd9Sstevel@tonic-gate page_unlock(tpp); 52927c478bd9Sstevel@tonic-gate } 5293db874c57Selowe 52947c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_try_demote_pages[5]); 52957c478bd9Sstevel@tonic-gate return (1); 52967c478bd9Sstevel@tonic-gate } 52977c478bd9Sstevel@tonic-gate 52987c478bd9Sstevel@tonic-gate /* 52997c478bd9Sstevel@tonic-gate * Called by page_free() and page_destroy() to demote the page size code 53007c478bd9Sstevel@tonic-gate * (p_szc) to 0 (since we can't just put a single PAGESIZE page with non zero 53017c478bd9Sstevel@tonic-gate * p_szc on free list, neither can we just clear p_szc of a single page_t 53027c478bd9Sstevel@tonic-gate * within a large page since it will break other code that relies on p_szc 53037c478bd9Sstevel@tonic-gate * being the same for all page_t's of a large page). Anonymous pages should 53047c478bd9Sstevel@tonic-gate * never end up here because anon_map_getpages() cannot deal with p_szc 53057c478bd9Sstevel@tonic-gate * changes after a single constituent page is locked. While anonymous or 53067c478bd9Sstevel@tonic-gate * kernel large pages are demoted or freed the entire large page at a time 53077c478bd9Sstevel@tonic-gate * with all constituent pages locked EXCL for the file system pages we 53087c478bd9Sstevel@tonic-gate * have to be able to demote a large page (i.e. decrease all constituent pages 53097c478bd9Sstevel@tonic-gate * p_szc) with only just an EXCL lock on one of constituent pages. The reason 53107c478bd9Sstevel@tonic-gate * we can easily deal with anonymous page demotion the entire large page at a 53117c478bd9Sstevel@tonic-gate * time is that those operation originate at address space level and concern 53127c478bd9Sstevel@tonic-gate * the entire large page region with actual demotion only done when pages are 53137c478bd9Sstevel@tonic-gate * not shared with any other processes (therefore we can always get EXCL lock 53147c478bd9Sstevel@tonic-gate * on all anonymous constituent pages after clearing segment page 53157c478bd9Sstevel@tonic-gate * cache). However file system pages can be truncated or invalidated at a 53167c478bd9Sstevel@tonic-gate * PAGESIZE level from the file system side and end up in page_free() or 53177c478bd9Sstevel@tonic-gate * page_destroy() (we also allow only part of the large page to be SOFTLOCKed 53187c478bd9Sstevel@tonic-gate * and therfore pageout should be able to demote a large page by EXCL locking 53197c478bd9Sstevel@tonic-gate * any constituent page that is not under SOFTLOCK). In those cases we cannot 53207c478bd9Sstevel@tonic-gate * rely on being able to lock EXCL all constituent pages. 53217c478bd9Sstevel@tonic-gate * 53227c478bd9Sstevel@tonic-gate * To prevent szc changes on file system pages one has to lock all constituent 53237c478bd9Sstevel@tonic-gate * pages at least SHARED (or call page_szc_lock()). The only subsystem that 53247c478bd9Sstevel@tonic-gate * doesn't rely on locking all constituent pages (or using page_szc_lock()) to 53257c478bd9Sstevel@tonic-gate * prevent szc changes is hat layer that uses its own page level mlist 53267c478bd9Sstevel@tonic-gate * locks. hat assumes that szc doesn't change after mlist lock for a page is 53277c478bd9Sstevel@tonic-gate * taken. Therefore we need to change szc under hat level locks if we only 53287c478bd9Sstevel@tonic-gate * have an EXCL lock on a single constituent page and hat still references any 53297c478bd9Sstevel@tonic-gate * of constituent pages. (Note we can't "ignore" hat layer by simply 53307c478bd9Sstevel@tonic-gate * hat_pageunload() all constituent pages without having EXCL locks on all of 53317c478bd9Sstevel@tonic-gate * constituent pages). We use hat_page_demote() call to safely demote szc of 53327c478bd9Sstevel@tonic-gate * all constituent pages under hat locks when we only have an EXCL lock on one 53337c478bd9Sstevel@tonic-gate * of constituent pages. 53347c478bd9Sstevel@tonic-gate * 53357c478bd9Sstevel@tonic-gate * This routine calls page_szc_lock() before calling hat_page_demote() to 53367c478bd9Sstevel@tonic-gate * allow segvn in one special case not to lock all constituent pages SHARED 53377c478bd9Sstevel@tonic-gate * before calling hat_memload_array() that relies on p_szc not changeing even 53387c478bd9Sstevel@tonic-gate * before hat level mlist lock is taken. In that case segvn uses 53397c478bd9Sstevel@tonic-gate * page_szc_lock() to prevent hat_page_demote() changeing p_szc values. 53407c478bd9Sstevel@tonic-gate * 53417c478bd9Sstevel@tonic-gate * Anonymous or kernel page demotion still has to lock all pages exclusively 53427c478bd9Sstevel@tonic-gate * and do hat_pageunload() on all constituent pages before demoting the page 53437c478bd9Sstevel@tonic-gate * therefore there's no need for anonymous or kernel page demotion to use 53447c478bd9Sstevel@tonic-gate * hat_page_demote() mechanism. 53457c478bd9Sstevel@tonic-gate * 53467c478bd9Sstevel@tonic-gate * hat_page_demote() removes all large mappings that map pp and then decreases 53477c478bd9Sstevel@tonic-gate * p_szc starting from the last constituent page of the large page. By working 53487c478bd9Sstevel@tonic-gate * from the tail of a large page in pfn decreasing order allows one looking at 53497c478bd9Sstevel@tonic-gate * the root page to know that hat_page_demote() is done for root's szc area. 53507c478bd9Sstevel@tonic-gate * e.g. if a root page has szc 1 one knows it only has to lock all constituent 53517c478bd9Sstevel@tonic-gate * pages within szc 1 area to prevent szc changes because hat_page_demote() 53527c478bd9Sstevel@tonic-gate * that started on this page when it had szc > 1 is done for this szc 1 area. 53537c478bd9Sstevel@tonic-gate * 53547c478bd9Sstevel@tonic-gate * We are guranteed that all constituent pages of pp's large page belong to 53557c478bd9Sstevel@tonic-gate * the same vnode with the consecutive offsets increasing in the direction of 53567c478bd9Sstevel@tonic-gate * the pfn i.e. the identity of constituent pages can't change until their 53577c478bd9Sstevel@tonic-gate * p_szc is decreased. Therefore it's safe for hat_page_demote() to remove 53587c478bd9Sstevel@tonic-gate * large mappings to pp even though we don't lock any constituent page except 53597c478bd9Sstevel@tonic-gate * pp (i.e. we won't unload e.g. kernel locked page). 53607c478bd9Sstevel@tonic-gate */ 53617c478bd9Sstevel@tonic-gate static void 53627c478bd9Sstevel@tonic-gate page_demote_vp_pages(page_t *pp) 53637c478bd9Sstevel@tonic-gate { 53647c478bd9Sstevel@tonic-gate kmutex_t *mtx; 53657c478bd9Sstevel@tonic-gate 53667c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(pp)); 53677c478bd9Sstevel@tonic-gate ASSERT(!PP_ISFREE(pp)); 53687c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode != NULL); 53697c478bd9Sstevel@tonic-gate ASSERT(!IS_SWAPFSVP(pp->p_vnode)); 53707c478bd9Sstevel@tonic-gate ASSERT(pp->p_vnode != &kvp); 53717c478bd9Sstevel@tonic-gate 53727c478bd9Sstevel@tonic-gate VM_STAT_ADD(pagecnt.pc_demote_pages[0]); 53737c478bd9Sstevel@tonic-gate 53747c478bd9Sstevel@tonic-gate mtx = page_szc_lock(pp); 53757c478bd9Sstevel@tonic-gate if (mtx != NULL) { 53767c478bd9Sstevel@tonic-gate hat_page_demote(pp); 53777c478bd9Sstevel@tonic-gate mutex_exit(mtx); 53787c478bd9Sstevel@tonic-gate } 53797c478bd9Sstevel@tonic-gate ASSERT(pp->p_szc == 0); 53807c478bd9Sstevel@tonic-gate } 53817c478bd9Sstevel@tonic-gate 53827c478bd9Sstevel@tonic-gate /* 53837c478bd9Sstevel@tonic-gate * Mark any existing pages for migration in the given range 53847c478bd9Sstevel@tonic-gate */ 53857c478bd9Sstevel@tonic-gate void 53867c478bd9Sstevel@tonic-gate page_mark_migrate(struct seg *seg, caddr_t addr, size_t len, 53877c478bd9Sstevel@tonic-gate struct anon_map *amp, ulong_t anon_index, vnode_t *vp, 53887c478bd9Sstevel@tonic-gate u_offset_t vnoff, int rflag) 53897c478bd9Sstevel@tonic-gate { 53907c478bd9Sstevel@tonic-gate struct anon *ap; 53917c478bd9Sstevel@tonic-gate vnode_t *curvp; 53927c478bd9Sstevel@tonic-gate lgrp_t *from; 53937c478bd9Sstevel@tonic-gate pgcnt_t i; 53947c478bd9Sstevel@tonic-gate pgcnt_t nlocked; 53957c478bd9Sstevel@tonic-gate u_offset_t off; 53967c478bd9Sstevel@tonic-gate pfn_t pfn; 53977c478bd9Sstevel@tonic-gate size_t pgsz; 53987c478bd9Sstevel@tonic-gate size_t segpgsz; 53997c478bd9Sstevel@tonic-gate pgcnt_t pages; 54007c478bd9Sstevel@tonic-gate uint_t pszc; 54017c478bd9Sstevel@tonic-gate page_t **ppa; 54027c478bd9Sstevel@tonic-gate pgcnt_t ppa_nentries; 54037c478bd9Sstevel@tonic-gate page_t *pp; 54047c478bd9Sstevel@tonic-gate caddr_t va; 54057c478bd9Sstevel@tonic-gate ulong_t an_idx; 54067c478bd9Sstevel@tonic-gate anon_sync_obj_t cookie; 54077c478bd9Sstevel@tonic-gate 54087c478bd9Sstevel@tonic-gate ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); 54097c478bd9Sstevel@tonic-gate 54107c478bd9Sstevel@tonic-gate /* 54117c478bd9Sstevel@tonic-gate * Don't do anything if don't need to do lgroup optimizations 54127c478bd9Sstevel@tonic-gate * on this system 54137c478bd9Sstevel@tonic-gate */ 54147c478bd9Sstevel@tonic-gate if (!lgrp_optimizations()) 54157c478bd9Sstevel@tonic-gate return; 54167c478bd9Sstevel@tonic-gate 54177c478bd9Sstevel@tonic-gate /* 54187c478bd9Sstevel@tonic-gate * Align address and length to (potentially large) page boundary 54197c478bd9Sstevel@tonic-gate */ 54207c478bd9Sstevel@tonic-gate segpgsz = page_get_pagesize(seg->s_szc); 54217c478bd9Sstevel@tonic-gate addr = (caddr_t)P2ALIGN((uintptr_t)addr, segpgsz); 54227c478bd9Sstevel@tonic-gate if (rflag) 54237c478bd9Sstevel@tonic-gate len = P2ROUNDUP(len, segpgsz); 54247c478bd9Sstevel@tonic-gate 54257c478bd9Sstevel@tonic-gate /* 54267c478bd9Sstevel@tonic-gate * Allocate page array to accomodate largest page size 54277c478bd9Sstevel@tonic-gate */ 54287c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(page_num_pagesizes() - 1); 54297c478bd9Sstevel@tonic-gate ppa_nentries = btop(pgsz); 54307c478bd9Sstevel@tonic-gate ppa = kmem_zalloc(ppa_nentries * sizeof (page_t *), KM_SLEEP); 54317c478bd9Sstevel@tonic-gate 54327c478bd9Sstevel@tonic-gate /* 54337c478bd9Sstevel@tonic-gate * Do one (large) page at a time 54347c478bd9Sstevel@tonic-gate */ 54357c478bd9Sstevel@tonic-gate va = addr; 54367c478bd9Sstevel@tonic-gate while (va < addr + len) { 54377c478bd9Sstevel@tonic-gate /* 54387c478bd9Sstevel@tonic-gate * Lookup (root) page for vnode and offset corresponding to 54397c478bd9Sstevel@tonic-gate * this virtual address 54407c478bd9Sstevel@tonic-gate * Try anonmap first since there may be copy-on-write 54417c478bd9Sstevel@tonic-gate * pages, but initialize vnode pointer and offset using 54427c478bd9Sstevel@tonic-gate * vnode arguments just in case there isn't an amp. 54437c478bd9Sstevel@tonic-gate */ 54447c478bd9Sstevel@tonic-gate curvp = vp; 54457c478bd9Sstevel@tonic-gate off = vnoff + va - seg->s_base; 54467c478bd9Sstevel@tonic-gate if (amp) { 54477c478bd9Sstevel@tonic-gate ANON_LOCK_ENTER(&->a_rwlock, RW_READER); 54487c478bd9Sstevel@tonic-gate an_idx = anon_index + seg_page(seg, va); 54497c478bd9Sstevel@tonic-gate anon_array_enter(amp, an_idx, &cookie); 54507c478bd9Sstevel@tonic-gate ap = anon_get_ptr(amp->ahp, an_idx); 54517c478bd9Sstevel@tonic-gate if (ap) 54527c478bd9Sstevel@tonic-gate swap_xlate(ap, &curvp, &off); 54537c478bd9Sstevel@tonic-gate anon_array_exit(&cookie); 54547c478bd9Sstevel@tonic-gate ANON_LOCK_EXIT(&->a_rwlock); 54557c478bd9Sstevel@tonic-gate } 54567c478bd9Sstevel@tonic-gate 54577c478bd9Sstevel@tonic-gate pp = NULL; 54587c478bd9Sstevel@tonic-gate if (curvp) 54597c478bd9Sstevel@tonic-gate pp = page_lookup(curvp, off, SE_SHARED); 54607c478bd9Sstevel@tonic-gate 54617c478bd9Sstevel@tonic-gate /* 54627c478bd9Sstevel@tonic-gate * If there isn't a page at this virtual address, 54637c478bd9Sstevel@tonic-gate * skip to next page 54647c478bd9Sstevel@tonic-gate */ 54657c478bd9Sstevel@tonic-gate if (pp == NULL) { 54667c478bd9Sstevel@tonic-gate va += PAGESIZE; 54677c478bd9Sstevel@tonic-gate continue; 54687c478bd9Sstevel@tonic-gate } 54697c478bd9Sstevel@tonic-gate 54707c478bd9Sstevel@tonic-gate /* 54717c478bd9Sstevel@tonic-gate * Figure out which lgroup this page is in for kstats 54727c478bd9Sstevel@tonic-gate */ 54737c478bd9Sstevel@tonic-gate pfn = page_pptonum(pp); 54747c478bd9Sstevel@tonic-gate from = lgrp_pfn_to_lgrp(pfn); 54757c478bd9Sstevel@tonic-gate 54767c478bd9Sstevel@tonic-gate /* 54777c478bd9Sstevel@tonic-gate * Get page size, and round up and skip to next page boundary 54787c478bd9Sstevel@tonic-gate * if unaligned address 54797c478bd9Sstevel@tonic-gate */ 54807c478bd9Sstevel@tonic-gate pszc = pp->p_szc; 54817c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(pszc); 54827c478bd9Sstevel@tonic-gate pages = btop(pgsz); 54837c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(va, pgsz) || 54847c478bd9Sstevel@tonic-gate !IS_P2ALIGNED(pfn, pages) || 54857c478bd9Sstevel@tonic-gate pgsz > segpgsz) { 54867c478bd9Sstevel@tonic-gate pgsz = MIN(pgsz, segpgsz); 54877c478bd9Sstevel@tonic-gate page_unlock(pp); 54887c478bd9Sstevel@tonic-gate i = btop(P2END((uintptr_t)va, pgsz) - 54897c478bd9Sstevel@tonic-gate (uintptr_t)va); 54907c478bd9Sstevel@tonic-gate va = (caddr_t)P2END((uintptr_t)va, pgsz); 54917c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_FAIL_PGS, i); 54927c478bd9Sstevel@tonic-gate continue; 54937c478bd9Sstevel@tonic-gate } 54947c478bd9Sstevel@tonic-gate 54957c478bd9Sstevel@tonic-gate /* 54967c478bd9Sstevel@tonic-gate * Upgrade to exclusive lock on page 54977c478bd9Sstevel@tonic-gate */ 54987c478bd9Sstevel@tonic-gate if (!page_tryupgrade(pp)) { 54997c478bd9Sstevel@tonic-gate page_unlock(pp); 55007c478bd9Sstevel@tonic-gate va += pgsz; 55017c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_FAIL_PGS, 55027c478bd9Sstevel@tonic-gate btop(pgsz)); 55037c478bd9Sstevel@tonic-gate continue; 55047c478bd9Sstevel@tonic-gate } 55057c478bd9Sstevel@tonic-gate 55067c478bd9Sstevel@tonic-gate /* 55077c478bd9Sstevel@tonic-gate * Remember pages locked exclusively and how many 55087c478bd9Sstevel@tonic-gate */ 55097c478bd9Sstevel@tonic-gate ppa[0] = pp; 55107c478bd9Sstevel@tonic-gate nlocked = 1; 55117c478bd9Sstevel@tonic-gate 55127c478bd9Sstevel@tonic-gate /* 55137c478bd9Sstevel@tonic-gate * Lock constituent pages if this is large page 55147c478bd9Sstevel@tonic-gate */ 55157c478bd9Sstevel@tonic-gate if (pages > 1) { 55167c478bd9Sstevel@tonic-gate /* 55177c478bd9Sstevel@tonic-gate * Lock all constituents except root page, since it 55187c478bd9Sstevel@tonic-gate * should be locked already. 55197c478bd9Sstevel@tonic-gate */ 55207c478bd9Sstevel@tonic-gate for (i = 1; i < pages; i++) { 5521affbd3ccSkchow pp++; 55227c478bd9Sstevel@tonic-gate if (!page_trylock(pp, SE_EXCL)) { 55237c478bd9Sstevel@tonic-gate break; 55247c478bd9Sstevel@tonic-gate } 55257c478bd9Sstevel@tonic-gate if (PP_ISFREE(pp) || 55267c478bd9Sstevel@tonic-gate pp->p_szc != pszc) { 55277c478bd9Sstevel@tonic-gate /* 55287c478bd9Sstevel@tonic-gate * hat_page_demote() raced in with us. 55297c478bd9Sstevel@tonic-gate */ 55307c478bd9Sstevel@tonic-gate ASSERT(!IS_SWAPFSVP(curvp)); 55317c478bd9Sstevel@tonic-gate page_unlock(pp); 55327c478bd9Sstevel@tonic-gate break; 55337c478bd9Sstevel@tonic-gate } 55347c478bd9Sstevel@tonic-gate ppa[nlocked] = pp; 55357c478bd9Sstevel@tonic-gate nlocked++; 55367c478bd9Sstevel@tonic-gate } 55377c478bd9Sstevel@tonic-gate } 55387c478bd9Sstevel@tonic-gate 55397c478bd9Sstevel@tonic-gate /* 55407c478bd9Sstevel@tonic-gate * If all constituent pages couldn't be locked, 55417c478bd9Sstevel@tonic-gate * unlock pages locked so far and skip to next page. 55427c478bd9Sstevel@tonic-gate */ 55437c478bd9Sstevel@tonic-gate if (nlocked != pages) { 55447c478bd9Sstevel@tonic-gate for (i = 0; i < nlocked; i++) 55457c478bd9Sstevel@tonic-gate page_unlock(ppa[i]); 55467c478bd9Sstevel@tonic-gate va += pgsz; 55477c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_FAIL_PGS, 55487c478bd9Sstevel@tonic-gate btop(pgsz)); 55497c478bd9Sstevel@tonic-gate continue; 55507c478bd9Sstevel@tonic-gate } 55517c478bd9Sstevel@tonic-gate 55527c478bd9Sstevel@tonic-gate /* 55537c478bd9Sstevel@tonic-gate * hat_page_demote() can no longer happen 55547c478bd9Sstevel@tonic-gate * since last cons page had the right p_szc after 55557c478bd9Sstevel@tonic-gate * all cons pages were locked. all cons pages 55567c478bd9Sstevel@tonic-gate * should now have the same p_szc. 55577c478bd9Sstevel@tonic-gate */ 55587c478bd9Sstevel@tonic-gate 55597c478bd9Sstevel@tonic-gate /* 55607c478bd9Sstevel@tonic-gate * All constituent pages locked successfully, so mark 55617c478bd9Sstevel@tonic-gate * large page for migration and unload the mappings of 55627c478bd9Sstevel@tonic-gate * constituent pages, so a fault will occur on any part of the 55637c478bd9Sstevel@tonic-gate * large page 55647c478bd9Sstevel@tonic-gate */ 55657c478bd9Sstevel@tonic-gate PP_SETMIGRATE(ppa[0]); 55667c478bd9Sstevel@tonic-gate for (i = 0; i < nlocked; i++) { 55677c478bd9Sstevel@tonic-gate pp = ppa[i]; 55687c478bd9Sstevel@tonic-gate (void) hat_pageunload(pp, HAT_FORCE_PGUNLOAD); 55697c478bd9Sstevel@tonic-gate ASSERT(hat_page_getshare(pp) == 0); 55707c478bd9Sstevel@tonic-gate page_unlock(pp); 55717c478bd9Sstevel@tonic-gate } 55727c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PMM_PGS, nlocked); 55737c478bd9Sstevel@tonic-gate 55747c478bd9Sstevel@tonic-gate va += pgsz; 55757c478bd9Sstevel@tonic-gate } 55767c478bd9Sstevel@tonic-gate kmem_free(ppa, ppa_nentries * sizeof (page_t *)); 55777c478bd9Sstevel@tonic-gate } 55787c478bd9Sstevel@tonic-gate 55797c478bd9Sstevel@tonic-gate /* 55807c478bd9Sstevel@tonic-gate * Migrate any pages that have been marked for migration in the given range 55817c478bd9Sstevel@tonic-gate */ 55827c478bd9Sstevel@tonic-gate void 55837c478bd9Sstevel@tonic-gate page_migrate( 55847c478bd9Sstevel@tonic-gate struct seg *seg, 55857c478bd9Sstevel@tonic-gate caddr_t addr, 55867c478bd9Sstevel@tonic-gate page_t **ppa, 55877c478bd9Sstevel@tonic-gate pgcnt_t npages) 55887c478bd9Sstevel@tonic-gate { 55897c478bd9Sstevel@tonic-gate lgrp_t *from; 55907c478bd9Sstevel@tonic-gate lgrp_t *to; 55917c478bd9Sstevel@tonic-gate page_t *newpp; 55927c478bd9Sstevel@tonic-gate page_t *pp; 55937c478bd9Sstevel@tonic-gate pfn_t pfn; 55947c478bd9Sstevel@tonic-gate size_t pgsz; 55957c478bd9Sstevel@tonic-gate spgcnt_t page_cnt; 55967c478bd9Sstevel@tonic-gate spgcnt_t i; 55977c478bd9Sstevel@tonic-gate uint_t pszc; 55987c478bd9Sstevel@tonic-gate 55997c478bd9Sstevel@tonic-gate ASSERT(seg->s_as && AS_LOCK_HELD(seg->s_as, &seg->s_as->a_lock)); 56007c478bd9Sstevel@tonic-gate 56017c478bd9Sstevel@tonic-gate while (npages > 0) { 56027c478bd9Sstevel@tonic-gate pp = *ppa; 56037c478bd9Sstevel@tonic-gate pszc = pp->p_szc; 56047c478bd9Sstevel@tonic-gate pgsz = page_get_pagesize(pszc); 56057c478bd9Sstevel@tonic-gate page_cnt = btop(pgsz); 56067c478bd9Sstevel@tonic-gate 56077c478bd9Sstevel@tonic-gate /* 56087c478bd9Sstevel@tonic-gate * Check to see whether this page is marked for migration 56097c478bd9Sstevel@tonic-gate * 56107c478bd9Sstevel@tonic-gate * Assume that root page of large page is marked for 56117c478bd9Sstevel@tonic-gate * migration and none of the other constituent pages 56127c478bd9Sstevel@tonic-gate * are marked. This really simplifies clearing the 56137c478bd9Sstevel@tonic-gate * migrate bit by not having to clear it from each 56147c478bd9Sstevel@tonic-gate * constituent page. 56157c478bd9Sstevel@tonic-gate * 56167c478bd9Sstevel@tonic-gate * note we don't want to relocate an entire large page if 56177c478bd9Sstevel@tonic-gate * someone is only using one subpage. 56187c478bd9Sstevel@tonic-gate */ 56197c478bd9Sstevel@tonic-gate if (npages < page_cnt) 56207c478bd9Sstevel@tonic-gate break; 56217c478bd9Sstevel@tonic-gate 56227c478bd9Sstevel@tonic-gate /* 56237c478bd9Sstevel@tonic-gate * Is it marked for migration? 56247c478bd9Sstevel@tonic-gate */ 56257c478bd9Sstevel@tonic-gate if (!PP_ISMIGRATE(pp)) 56267c478bd9Sstevel@tonic-gate goto next; 56277c478bd9Sstevel@tonic-gate 56287c478bd9Sstevel@tonic-gate /* 56297c478bd9Sstevel@tonic-gate * Determine lgroups that page is being migrated between 56307c478bd9Sstevel@tonic-gate */ 56317c478bd9Sstevel@tonic-gate pfn = page_pptonum(pp); 56327c478bd9Sstevel@tonic-gate if (!IS_P2ALIGNED(pfn, page_cnt)) { 56337c478bd9Sstevel@tonic-gate break; 56347c478bd9Sstevel@tonic-gate } 56357c478bd9Sstevel@tonic-gate from = lgrp_pfn_to_lgrp(pfn); 56367c478bd9Sstevel@tonic-gate to = lgrp_mem_choose(seg, addr, pgsz); 56377c478bd9Sstevel@tonic-gate 56387c478bd9Sstevel@tonic-gate /* 56397c478bd9Sstevel@tonic-gate * Check to see whether we are trying to migrate page to lgroup 56407c478bd9Sstevel@tonic-gate * where it is allocated already 56417c478bd9Sstevel@tonic-gate */ 56427c478bd9Sstevel@tonic-gate if (to == from) { 56437c478bd9Sstevel@tonic-gate PP_CLRMIGRATE(pp); 56447c478bd9Sstevel@tonic-gate goto next; 56457c478bd9Sstevel@tonic-gate } 56467c478bd9Sstevel@tonic-gate 56477c478bd9Sstevel@tonic-gate /* 56487c478bd9Sstevel@tonic-gate * Need to get exclusive lock's to migrate 56497c478bd9Sstevel@tonic-gate */ 56507c478bd9Sstevel@tonic-gate for (i = 0; i < page_cnt; i++) { 56517c478bd9Sstevel@tonic-gate ASSERT(PAGE_LOCKED(ppa[i])); 56527c478bd9Sstevel@tonic-gate if (page_pptonum(ppa[i]) != pfn + i || 56537c478bd9Sstevel@tonic-gate ppa[i]->p_szc != pszc) { 56547c478bd9Sstevel@tonic-gate break; 56557c478bd9Sstevel@tonic-gate } 56567c478bd9Sstevel@tonic-gate if (!page_tryupgrade(ppa[i])) { 56577c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, 56587c478bd9Sstevel@tonic-gate LGRP_PM_FAIL_LOCK_PGS, 56597c478bd9Sstevel@tonic-gate page_cnt); 56607c478bd9Sstevel@tonic-gate break; 56617c478bd9Sstevel@tonic-gate } 56627c478bd9Sstevel@tonic-gate } 56637c478bd9Sstevel@tonic-gate if (i != page_cnt) { 56647c478bd9Sstevel@tonic-gate while (--i != -1) { 56657c478bd9Sstevel@tonic-gate page_downgrade(ppa[i]); 56667c478bd9Sstevel@tonic-gate } 56677c478bd9Sstevel@tonic-gate goto next; 56687c478bd9Sstevel@tonic-gate } 56697c478bd9Sstevel@tonic-gate 56707c478bd9Sstevel@tonic-gate (void) page_create_wait(page_cnt, PG_WAIT); 56717c478bd9Sstevel@tonic-gate newpp = page_get_replacement_page(pp, to, PGR_SAMESZC); 56727c478bd9Sstevel@tonic-gate if (newpp == NULL) { 56737c478bd9Sstevel@tonic-gate page_create_putback(page_cnt); 56747c478bd9Sstevel@tonic-gate for (i = 0; i < page_cnt; i++) { 56757c478bd9Sstevel@tonic-gate page_downgrade(ppa[i]); 56767c478bd9Sstevel@tonic-gate } 56777c478bd9Sstevel@tonic-gate lgrp_stat_add(to->lgrp_id, LGRP_PM_FAIL_ALLOC_PGS, 56787c478bd9Sstevel@tonic-gate page_cnt); 56797c478bd9Sstevel@tonic-gate goto next; 56807c478bd9Sstevel@tonic-gate } 56817c478bd9Sstevel@tonic-gate ASSERT(newpp->p_szc == pszc); 56827c478bd9Sstevel@tonic-gate /* 56837c478bd9Sstevel@tonic-gate * Clear migrate bit and relocate page 56847c478bd9Sstevel@tonic-gate */ 56857c478bd9Sstevel@tonic-gate PP_CLRMIGRATE(pp); 56867c478bd9Sstevel@tonic-gate if (page_relocate(&pp, &newpp, 0, 1, &page_cnt, to)) { 56877c478bd9Sstevel@tonic-gate panic("page_migrate: page_relocate failed"); 56887c478bd9Sstevel@tonic-gate } 56897c478bd9Sstevel@tonic-gate ASSERT(page_cnt * PAGESIZE == pgsz); 56907c478bd9Sstevel@tonic-gate 56917c478bd9Sstevel@tonic-gate /* 56927c478bd9Sstevel@tonic-gate * Keep stats for number of pages migrated from and to 56937c478bd9Sstevel@tonic-gate * each lgroup 56947c478bd9Sstevel@tonic-gate */ 56957c478bd9Sstevel@tonic-gate lgrp_stat_add(from->lgrp_id, LGRP_PM_SRC_PGS, page_cnt); 56967c478bd9Sstevel@tonic-gate lgrp_stat_add(to->lgrp_id, LGRP_PM_DEST_PGS, page_cnt); 56977c478bd9Sstevel@tonic-gate /* 56987c478bd9Sstevel@tonic-gate * update the page_t array we were passed in and 56997c478bd9Sstevel@tonic-gate * unlink constituent pages of a large page. 57007c478bd9Sstevel@tonic-gate */ 57017c478bd9Sstevel@tonic-gate for (i = 0; i < page_cnt; ++i, ++pp) { 57027c478bd9Sstevel@tonic-gate ASSERT(PAGE_EXCL(newpp)); 57037c478bd9Sstevel@tonic-gate ASSERT(newpp->p_szc == pszc); 57047c478bd9Sstevel@tonic-gate ppa[i] = newpp; 57057c478bd9Sstevel@tonic-gate pp = newpp; 57067c478bd9Sstevel@tonic-gate page_sub(&newpp, pp); 57077c478bd9Sstevel@tonic-gate page_downgrade(pp); 57087c478bd9Sstevel@tonic-gate } 57097c478bd9Sstevel@tonic-gate ASSERT(newpp == NULL); 57107c478bd9Sstevel@tonic-gate next: 57117c478bd9Sstevel@tonic-gate addr += pgsz; 57127c478bd9Sstevel@tonic-gate ppa += page_cnt; 57137c478bd9Sstevel@tonic-gate npages -= page_cnt; 57147c478bd9Sstevel@tonic-gate } 57157c478bd9Sstevel@tonic-gate } 57167c478bd9Sstevel@tonic-gate 57177c478bd9Sstevel@tonic-gate ulong_t mem_waiters = 0; 57187c478bd9Sstevel@tonic-gate ulong_t max_count = 20; 57197c478bd9Sstevel@tonic-gate #define MAX_DELAY 0x1ff 57207c478bd9Sstevel@tonic-gate 57217c478bd9Sstevel@tonic-gate /* 57227c478bd9Sstevel@tonic-gate * Check if enough memory is available to proceed. 57237c478bd9Sstevel@tonic-gate * Depending on system configuration and how much memory is 57247c478bd9Sstevel@tonic-gate * reserved for swap we need to check against two variables. 57257c478bd9Sstevel@tonic-gate * e.g. on systems with little physical swap availrmem can be 57267c478bd9Sstevel@tonic-gate * more reliable indicator of how much memory is available. 57277c478bd9Sstevel@tonic-gate * On systems with large phys swap freemem can be better indicator. 57287c478bd9Sstevel@tonic-gate * If freemem drops below threshold level don't return an error 57297c478bd9Sstevel@tonic-gate * immediately but wake up pageout to free memory and block. 57307c478bd9Sstevel@tonic-gate * This is done number of times. If pageout is not able to free 57317c478bd9Sstevel@tonic-gate * memory within certain time return an error. 57327c478bd9Sstevel@tonic-gate * The same applies for availrmem but kmem_reap is used to 57337c478bd9Sstevel@tonic-gate * free memory. 57347c478bd9Sstevel@tonic-gate */ 57357c478bd9Sstevel@tonic-gate int 57367c478bd9Sstevel@tonic-gate page_mem_avail(pgcnt_t npages) 57377c478bd9Sstevel@tonic-gate { 57387c478bd9Sstevel@tonic-gate ulong_t count; 57397c478bd9Sstevel@tonic-gate 57407c478bd9Sstevel@tonic-gate #if defined(__i386) 57417c478bd9Sstevel@tonic-gate if (freemem > desfree + npages && 57427c478bd9Sstevel@tonic-gate availrmem > swapfs_reserve + npages && 57437c478bd9Sstevel@tonic-gate btop(vmem_size(heap_arena, VMEM_FREE)) > tune.t_minarmem + 57447c478bd9Sstevel@tonic-gate npages) 57457c478bd9Sstevel@tonic-gate return (1); 57467c478bd9Sstevel@tonic-gate #else 57477c478bd9Sstevel@tonic-gate if (freemem > desfree + npages && 57487c478bd9Sstevel@tonic-gate availrmem > swapfs_reserve + npages) 57497c478bd9Sstevel@tonic-gate return (1); 57507c478bd9Sstevel@tonic-gate #endif 57517c478bd9Sstevel@tonic-gate 57527c478bd9Sstevel@tonic-gate count = max_count; 57537c478bd9Sstevel@tonic-gate atomic_add_long(&mem_waiters, 1); 57547c478bd9Sstevel@tonic-gate 57557c478bd9Sstevel@tonic-gate while (freemem < desfree + npages && --count) { 57567c478bd9Sstevel@tonic-gate cv_signal(&proc_pageout->p_cv); 57577c478bd9Sstevel@tonic-gate if (delay_sig(hz + (mem_waiters & MAX_DELAY))) { 57587c478bd9Sstevel@tonic-gate atomic_add_long(&mem_waiters, -1); 57597c478bd9Sstevel@tonic-gate return (0); 57607c478bd9Sstevel@tonic-gate } 57617c478bd9Sstevel@tonic-gate } 57627c478bd9Sstevel@tonic-gate if (count == 0) { 57637c478bd9Sstevel@tonic-gate atomic_add_long(&mem_waiters, -1); 57647c478bd9Sstevel@tonic-gate return (0); 57657c478bd9Sstevel@tonic-gate } 57667c478bd9Sstevel@tonic-gate 57677c478bd9Sstevel@tonic-gate count = max_count; 57687c478bd9Sstevel@tonic-gate while (availrmem < swapfs_reserve + npages && --count) { 57697c478bd9Sstevel@tonic-gate kmem_reap(); 57707c478bd9Sstevel@tonic-gate if (delay_sig(hz + (mem_waiters & MAX_DELAY))) { 57717c478bd9Sstevel@tonic-gate atomic_add_long(&mem_waiters, -1); 57727c478bd9Sstevel@tonic-gate return (0); 57737c478bd9Sstevel@tonic-gate } 57747c478bd9Sstevel@tonic-gate } 57757c478bd9Sstevel@tonic-gate atomic_add_long(&mem_waiters, -1); 57767c478bd9Sstevel@tonic-gate if (count == 0) 57777c478bd9Sstevel@tonic-gate return (0); 57787c478bd9Sstevel@tonic-gate 57797c478bd9Sstevel@tonic-gate #if defined(__i386) 57807c478bd9Sstevel@tonic-gate if (btop(vmem_size(heap_arena, VMEM_FREE)) < 57817c478bd9Sstevel@tonic-gate tune.t_minarmem + npages) 57827c478bd9Sstevel@tonic-gate return (0); 57837c478bd9Sstevel@tonic-gate #endif 57847c478bd9Sstevel@tonic-gate return (1); 57857c478bd9Sstevel@tonic-gate } 57867c478bd9Sstevel@tonic-gate 57873cff2f43Sstans #define MAX_CNT 60 /* max num of iterations */ 57883cff2f43Sstans /* 57893cff2f43Sstans * Reclaim/reserve availrmem for npages. 57903cff2f43Sstans * If there is not enough memory start reaping seg, kmem caches. 57913cff2f43Sstans * Start pageout scanner (via page_needfree()). 57923cff2f43Sstans * Exit after ~ MAX_CNT s regardless of how much memory has been released. 57933cff2f43Sstans * Note: There is no guarantee that any availrmem will be freed as 57943cff2f43Sstans * this memory typically is locked (kernel heap) or reserved for swap. 57953cff2f43Sstans * Also due to memory fragmentation kmem allocator may not be able 57963cff2f43Sstans * to free any memory (single user allocated buffer will prevent 57973cff2f43Sstans * freeing slab or a page). 57983cff2f43Sstans */ 57993cff2f43Sstans int 58003cff2f43Sstans page_reclaim_mem(pgcnt_t npages, pgcnt_t epages, int adjust) 58013cff2f43Sstans { 58023cff2f43Sstans int i = 0; 58033cff2f43Sstans int ret = 0; 58043cff2f43Sstans pgcnt_t deficit; 58053cff2f43Sstans pgcnt_t old_availrmem; 58063cff2f43Sstans 58073cff2f43Sstans mutex_enter(&freemem_lock); 58083cff2f43Sstans old_availrmem = availrmem - 1; 58093cff2f43Sstans while ((availrmem < tune.t_minarmem + npages + epages) && 58103cff2f43Sstans (old_availrmem < availrmem) && (i++ < MAX_CNT)) { 58113cff2f43Sstans old_availrmem = availrmem; 58123cff2f43Sstans deficit = tune.t_minarmem + npages + epages - availrmem; 58133cff2f43Sstans mutex_exit(&freemem_lock); 58143cff2f43Sstans page_needfree(deficit); 58153cff2f43Sstans seg_preap(); 58163cff2f43Sstans kmem_reap(); 58173cff2f43Sstans delay(hz); 58183cff2f43Sstans page_needfree(-(spgcnt_t)deficit); 58193cff2f43Sstans mutex_enter(&freemem_lock); 58203cff2f43Sstans } 58213cff2f43Sstans 58223cff2f43Sstans if (adjust && (availrmem >= tune.t_minarmem + npages + epages)) { 58233cff2f43Sstans availrmem -= npages; 58243cff2f43Sstans ret = 1; 58253cff2f43Sstans } 58263cff2f43Sstans 58273cff2f43Sstans mutex_exit(&freemem_lock); 58283cff2f43Sstans 58293cff2f43Sstans return (ret); 58303cff2f43Sstans } 58317c478bd9Sstevel@tonic-gate 58327c478bd9Sstevel@tonic-gate /* 58337c478bd9Sstevel@tonic-gate * Search the memory segments to locate the desired page. Within a 58347c478bd9Sstevel@tonic-gate * segment, pages increase linearly with one page structure per 58357c478bd9Sstevel@tonic-gate * physical page frame (size PAGESIZE). The search begins 58367c478bd9Sstevel@tonic-gate * with the segment that was accessed last, to take advantage of locality. 58377c478bd9Sstevel@tonic-gate * If the hint misses, we start from the beginning of the sorted memseg list 58387c478bd9Sstevel@tonic-gate */ 58397c478bd9Sstevel@tonic-gate 58407c478bd9Sstevel@tonic-gate 58417c478bd9Sstevel@tonic-gate /* 58427c478bd9Sstevel@tonic-gate * Some data structures for pfn to pp lookup. 58437c478bd9Sstevel@tonic-gate */ 58447c478bd9Sstevel@tonic-gate ulong_t mhash_per_slot; 58457c478bd9Sstevel@tonic-gate struct memseg *memseg_hash[N_MEM_SLOTS]; 58467c478bd9Sstevel@tonic-gate 58477c478bd9Sstevel@tonic-gate page_t * 58487c478bd9Sstevel@tonic-gate page_numtopp_nolock(pfn_t pfnum) 58497c478bd9Sstevel@tonic-gate { 58507c478bd9Sstevel@tonic-gate struct memseg *seg; 58517c478bd9Sstevel@tonic-gate page_t *pp; 5852affbd3ccSkchow vm_cpu_data_t *vc = CPU->cpu_vm_data; 58537c478bd9Sstevel@tonic-gate 5854affbd3ccSkchow ASSERT(vc != NULL); 58557c478bd9Sstevel@tonic-gate 58567c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nsearch); 58577c478bd9Sstevel@tonic-gate 58587c478bd9Sstevel@tonic-gate /* Try last winner first */ 5859affbd3ccSkchow if (((seg = vc->vc_pnum_memseg) != NULL) && 58607c478bd9Sstevel@tonic-gate (pfnum >= seg->pages_base) && (pfnum < seg->pages_end)) { 58617c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nlastwon); 58627c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 58637c478bd9Sstevel@tonic-gate if (pp->p_pagenum == pfnum) 58647c478bd9Sstevel@tonic-gate return ((page_t *)pp); 58657c478bd9Sstevel@tonic-gate } 58667c478bd9Sstevel@tonic-gate 58677c478bd9Sstevel@tonic-gate /* Else Try hash */ 58687c478bd9Sstevel@tonic-gate if (((seg = memseg_hash[MEMSEG_PFN_HASH(pfnum)]) != NULL) && 58697c478bd9Sstevel@tonic-gate (pfnum >= seg->pages_base) && (pfnum < seg->pages_end)) { 58707c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nhashwon); 5871affbd3ccSkchow vc->vc_pnum_memseg = seg; 58727c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 58737c478bd9Sstevel@tonic-gate if (pp->p_pagenum == pfnum) 58747c478bd9Sstevel@tonic-gate return ((page_t *)pp); 58757c478bd9Sstevel@tonic-gate } 58767c478bd9Sstevel@tonic-gate 58777c478bd9Sstevel@tonic-gate /* Else Brute force */ 58787c478bd9Sstevel@tonic-gate for (seg = memsegs; seg != NULL; seg = seg->next) { 58797c478bd9Sstevel@tonic-gate if (pfnum >= seg->pages_base && pfnum < seg->pages_end) { 5880affbd3ccSkchow vc->vc_pnum_memseg = seg; 58817c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 58827c478bd9Sstevel@tonic-gate return ((page_t *)pp); 58837c478bd9Sstevel@tonic-gate } 58847c478bd9Sstevel@tonic-gate } 5885affbd3ccSkchow vc->vc_pnum_memseg = NULL; 58867c478bd9Sstevel@tonic-gate MEMSEG_STAT_INCR(nnotfound); 58877c478bd9Sstevel@tonic-gate return ((page_t *)NULL); 58887c478bd9Sstevel@tonic-gate 58897c478bd9Sstevel@tonic-gate } 58907c478bd9Sstevel@tonic-gate 58917c478bd9Sstevel@tonic-gate struct memseg * 58927c478bd9Sstevel@tonic-gate page_numtomemseg_nolock(pfn_t pfnum) 58937c478bd9Sstevel@tonic-gate { 58947c478bd9Sstevel@tonic-gate struct memseg *seg; 58957c478bd9Sstevel@tonic-gate page_t *pp; 58967c478bd9Sstevel@tonic-gate 58977c478bd9Sstevel@tonic-gate /* Try hash */ 58987c478bd9Sstevel@tonic-gate if (((seg = memseg_hash[MEMSEG_PFN_HASH(pfnum)]) != NULL) && 58997c478bd9Sstevel@tonic-gate (pfnum >= seg->pages_base) && (pfnum < seg->pages_end)) { 59007c478bd9Sstevel@tonic-gate pp = seg->pages + (pfnum - seg->pages_base); 59017c478bd9Sstevel@tonic-gate if (pp->p_pagenum == pfnum) 59027c478bd9Sstevel@tonic-gate return (seg); 59037c478bd9Sstevel@tonic-gate } 59047c478bd9Sstevel@tonic-gate 59057c478bd9Sstevel@tonic-gate /* Else Brute force */ 59067c478bd9Sstevel@tonic-gate for (seg = memsegs; seg != NULL; seg = seg->next) { 59077c478bd9Sstevel@tonic-gate if (pfnum >= seg->pages_base && pfnum < seg->pages_end) { 59087c478bd9Sstevel@tonic-gate return (seg); 59097c478bd9Sstevel@tonic-gate } 59107c478bd9Sstevel@tonic-gate } 59117c478bd9Sstevel@tonic-gate return ((struct memseg *)NULL); 59127c478bd9Sstevel@tonic-gate } 59137c478bd9Sstevel@tonic-gate 59147c478bd9Sstevel@tonic-gate /* 59157c478bd9Sstevel@tonic-gate * Given a page and a count return the page struct that is 59167c478bd9Sstevel@tonic-gate * n structs away from the current one in the global page 59177c478bd9Sstevel@tonic-gate * list. 59187c478bd9Sstevel@tonic-gate * 59197c478bd9Sstevel@tonic-gate * This function wraps to the first page upon 59207c478bd9Sstevel@tonic-gate * reaching the end of the memseg list. 59217c478bd9Sstevel@tonic-gate */ 59227c478bd9Sstevel@tonic-gate page_t * 59237c478bd9Sstevel@tonic-gate page_nextn(page_t *pp, ulong_t n) 59247c478bd9Sstevel@tonic-gate { 59257c478bd9Sstevel@tonic-gate struct memseg *seg; 59267c478bd9Sstevel@tonic-gate page_t *ppn; 5927affbd3ccSkchow vm_cpu_data_t *vc = (vm_cpu_data_t *)CPU->cpu_vm_data; 59287c478bd9Sstevel@tonic-gate 5929affbd3ccSkchow ASSERT(vc != NULL); 5930affbd3ccSkchow 5931affbd3ccSkchow if (((seg = vc->vc_pnext_memseg) == NULL) || 59327c478bd9Sstevel@tonic-gate (seg->pages_base == seg->pages_end) || 59337c478bd9Sstevel@tonic-gate !(pp >= seg->pages && pp < seg->epages)) { 59347c478bd9Sstevel@tonic-gate 59357c478bd9Sstevel@tonic-gate for (seg = memsegs; seg; seg = seg->next) { 59367c478bd9Sstevel@tonic-gate if (pp >= seg->pages && pp < seg->epages) 59377c478bd9Sstevel@tonic-gate break; 59387c478bd9Sstevel@tonic-gate } 59397c478bd9Sstevel@tonic-gate 59407c478bd9Sstevel@tonic-gate if (seg == NULL) { 59417c478bd9Sstevel@tonic-gate /* Memory delete got in, return something valid. */ 59427c478bd9Sstevel@tonic-gate /* TODO: fix me. */ 59437c478bd9Sstevel@tonic-gate seg = memsegs; 59447c478bd9Sstevel@tonic-gate pp = seg->pages; 59457c478bd9Sstevel@tonic-gate } 59467c478bd9Sstevel@tonic-gate } 59477c478bd9Sstevel@tonic-gate 59487c478bd9Sstevel@tonic-gate /* check for wraparound - possible if n is large */ 59497c478bd9Sstevel@tonic-gate while ((ppn = (pp + n)) >= seg->epages || ppn < pp) { 59507c478bd9Sstevel@tonic-gate n -= seg->epages - pp; 59517c478bd9Sstevel@tonic-gate seg = seg->next; 59527c478bd9Sstevel@tonic-gate if (seg == NULL) 59537c478bd9Sstevel@tonic-gate seg = memsegs; 59547c478bd9Sstevel@tonic-gate pp = seg->pages; 59557c478bd9Sstevel@tonic-gate } 5956affbd3ccSkchow vc->vc_pnext_memseg = seg; 59577c478bd9Sstevel@tonic-gate return (ppn); 59587c478bd9Sstevel@tonic-gate } 59597c478bd9Sstevel@tonic-gate 59607c478bd9Sstevel@tonic-gate /* 59617c478bd9Sstevel@tonic-gate * Initialize for a loop using page_next_scan_large(). 59627c478bd9Sstevel@tonic-gate */ 59637c478bd9Sstevel@tonic-gate page_t * 59647c478bd9Sstevel@tonic-gate page_next_scan_init(void **cookie) 59657c478bd9Sstevel@tonic-gate { 59667c478bd9Sstevel@tonic-gate ASSERT(cookie != NULL); 59677c478bd9Sstevel@tonic-gate *cookie = (void *)memsegs; 59687c478bd9Sstevel@tonic-gate return ((page_t *)memsegs->pages); 59697c478bd9Sstevel@tonic-gate } 59707c478bd9Sstevel@tonic-gate 59717c478bd9Sstevel@tonic-gate /* 59727c478bd9Sstevel@tonic-gate * Return the next page in a scan of page_t's, assuming we want 59737c478bd9Sstevel@tonic-gate * to skip over sub-pages within larger page sizes. 59747c478bd9Sstevel@tonic-gate * 59757c478bd9Sstevel@tonic-gate * The cookie is used to keep track of the current memseg. 59767c478bd9Sstevel@tonic-gate */ 59777c478bd9Sstevel@tonic-gate page_t * 59787c478bd9Sstevel@tonic-gate page_next_scan_large( 59797c478bd9Sstevel@tonic-gate page_t *pp, 59807c478bd9Sstevel@tonic-gate ulong_t *n, 59817c478bd9Sstevel@tonic-gate void **cookie) 59827c478bd9Sstevel@tonic-gate { 59837c478bd9Sstevel@tonic-gate struct memseg *seg = (struct memseg *)*cookie; 59847c478bd9Sstevel@tonic-gate page_t *new_pp; 59857c478bd9Sstevel@tonic-gate ulong_t cnt; 59867c478bd9Sstevel@tonic-gate pfn_t pfn; 59877c478bd9Sstevel@tonic-gate 59887c478bd9Sstevel@tonic-gate 59897c478bd9Sstevel@tonic-gate /* 59907c478bd9Sstevel@tonic-gate * get the count of page_t's to skip based on the page size 59917c478bd9Sstevel@tonic-gate */ 59927c478bd9Sstevel@tonic-gate ASSERT(pp != NULL); 59937c478bd9Sstevel@tonic-gate if (pp->p_szc == 0) { 59947c478bd9Sstevel@tonic-gate cnt = 1; 59957c478bd9Sstevel@tonic-gate } else { 59967c478bd9Sstevel@tonic-gate pfn = page_pptonum(pp); 59977c478bd9Sstevel@tonic-gate cnt = page_get_pagecnt(pp->p_szc); 59987c478bd9Sstevel@tonic-gate cnt -= pfn & (cnt - 1); 59997c478bd9Sstevel@tonic-gate } 60007c478bd9Sstevel@tonic-gate *n += cnt; 60017c478bd9Sstevel@tonic-gate new_pp = pp + cnt; 60027c478bd9Sstevel@tonic-gate 60037c478bd9Sstevel@tonic-gate /* 60047c478bd9Sstevel@tonic-gate * Catch if we went past the end of the current memory segment. If so, 60057c478bd9Sstevel@tonic-gate * just move to the next segment with pages. 60067c478bd9Sstevel@tonic-gate */ 60077c478bd9Sstevel@tonic-gate if (new_pp >= seg->epages) { 60087c478bd9Sstevel@tonic-gate do { 60097c478bd9Sstevel@tonic-gate seg = seg->next; 60107c478bd9Sstevel@tonic-gate if (seg == NULL) 60117c478bd9Sstevel@tonic-gate seg = memsegs; 60127c478bd9Sstevel@tonic-gate } while (seg->pages == seg->epages); 60137c478bd9Sstevel@tonic-gate new_pp = seg->pages; 60147c478bd9Sstevel@tonic-gate *cookie = (void *)seg; 60157c478bd9Sstevel@tonic-gate } 60167c478bd9Sstevel@tonic-gate 60177c478bd9Sstevel@tonic-gate return (new_pp); 60187c478bd9Sstevel@tonic-gate } 60197c478bd9Sstevel@tonic-gate 60207c478bd9Sstevel@tonic-gate 60217c478bd9Sstevel@tonic-gate /* 60227c478bd9Sstevel@tonic-gate * Returns next page in list. Note: this function wraps 60237c478bd9Sstevel@tonic-gate * to the first page in the list upon reaching the end 60247c478bd9Sstevel@tonic-gate * of the list. Callers should be aware of this fact. 60257c478bd9Sstevel@tonic-gate */ 60267c478bd9Sstevel@tonic-gate 60277c478bd9Sstevel@tonic-gate /* We should change this be a #define */ 60287c478bd9Sstevel@tonic-gate 60297c478bd9Sstevel@tonic-gate page_t * 60307c478bd9Sstevel@tonic-gate page_next(page_t *pp) 60317c478bd9Sstevel@tonic-gate { 60327c478bd9Sstevel@tonic-gate return (page_nextn(pp, 1)); 60337c478bd9Sstevel@tonic-gate } 60347c478bd9Sstevel@tonic-gate 60357c478bd9Sstevel@tonic-gate page_t * 60367c478bd9Sstevel@tonic-gate page_first() 60377c478bd9Sstevel@tonic-gate { 60387c478bd9Sstevel@tonic-gate return ((page_t *)memsegs->pages); 60397c478bd9Sstevel@tonic-gate } 60407c478bd9Sstevel@tonic-gate 60417c478bd9Sstevel@tonic-gate 60427c478bd9Sstevel@tonic-gate /* 60437c478bd9Sstevel@tonic-gate * This routine is called at boot with the initial memory configuration 60447c478bd9Sstevel@tonic-gate * and when memory is added or removed. 60457c478bd9Sstevel@tonic-gate */ 60467c478bd9Sstevel@tonic-gate void 60477c478bd9Sstevel@tonic-gate build_pfn_hash() 60487c478bd9Sstevel@tonic-gate { 60497c478bd9Sstevel@tonic-gate pfn_t cur; 60507c478bd9Sstevel@tonic-gate pgcnt_t index; 60517c478bd9Sstevel@tonic-gate struct memseg *pseg; 60527c478bd9Sstevel@tonic-gate int i; 60537c478bd9Sstevel@tonic-gate 60547c478bd9Sstevel@tonic-gate /* 60557c478bd9Sstevel@tonic-gate * Clear memseg_hash array. 60567c478bd9Sstevel@tonic-gate * Since memory add/delete is designed to operate concurrently 60577c478bd9Sstevel@tonic-gate * with normal operation, the hash rebuild must be able to run 60587c478bd9Sstevel@tonic-gate * concurrently with page_numtopp_nolock(). To support this 60597c478bd9Sstevel@tonic-gate * functionality, assignments to memseg_hash array members must 60607c478bd9Sstevel@tonic-gate * be done atomically. 60617c478bd9Sstevel@tonic-gate * 60627c478bd9Sstevel@tonic-gate * NOTE: bzero() does not currently guarantee this for kernel 60637c478bd9Sstevel@tonic-gate * threads, and cannot be used here. 60647c478bd9Sstevel@tonic-gate */ 60657c478bd9Sstevel@tonic-gate for (i = 0; i < N_MEM_SLOTS; i++) 60667c478bd9Sstevel@tonic-gate memseg_hash[i] = NULL; 60677c478bd9Sstevel@tonic-gate 60687c478bd9Sstevel@tonic-gate hat_kpm_mseghash_clear(N_MEM_SLOTS); 60697c478bd9Sstevel@tonic-gate 60707c478bd9Sstevel@tonic-gate /* 60717c478bd9Sstevel@tonic-gate * Physmax is the last valid pfn. 60727c478bd9Sstevel@tonic-gate */ 60737c478bd9Sstevel@tonic-gate mhash_per_slot = (physmax + 1) >> MEM_HASH_SHIFT; 60747c478bd9Sstevel@tonic-gate for (pseg = memsegs; pseg != NULL; pseg = pseg->next) { 60757c478bd9Sstevel@tonic-gate index = MEMSEG_PFN_HASH(pseg->pages_base); 60767c478bd9Sstevel@tonic-gate cur = pseg->pages_base; 60777c478bd9Sstevel@tonic-gate do { 60787c478bd9Sstevel@tonic-gate if (index >= N_MEM_SLOTS) 60797c478bd9Sstevel@tonic-gate index = MEMSEG_PFN_HASH(cur); 60807c478bd9Sstevel@tonic-gate 60817c478bd9Sstevel@tonic-gate if (memseg_hash[index] == NULL || 60827c478bd9Sstevel@tonic-gate memseg_hash[index]->pages_base > pseg->pages_base) { 60837c478bd9Sstevel@tonic-gate memseg_hash[index] = pseg; 60847c478bd9Sstevel@tonic-gate hat_kpm_mseghash_update(index, pseg); 60857c478bd9Sstevel@tonic-gate } 60867c478bd9Sstevel@tonic-gate cur += mhash_per_slot; 60877c478bd9Sstevel@tonic-gate index++; 60887c478bd9Sstevel@tonic-gate } while (cur < pseg->pages_end); 60897c478bd9Sstevel@tonic-gate } 60907c478bd9Sstevel@tonic-gate } 60917c478bd9Sstevel@tonic-gate 60927c478bd9Sstevel@tonic-gate /* 60937c478bd9Sstevel@tonic-gate * Return the pagenum for the pp 60947c478bd9Sstevel@tonic-gate */ 60957c478bd9Sstevel@tonic-gate pfn_t 60967c478bd9Sstevel@tonic-gate page_pptonum(page_t *pp) 60977c478bd9Sstevel@tonic-gate { 60987c478bd9Sstevel@tonic-gate return (pp->p_pagenum); 60997c478bd9Sstevel@tonic-gate } 61007c478bd9Sstevel@tonic-gate 61017c478bd9Sstevel@tonic-gate /* 61027c478bd9Sstevel@tonic-gate * interface to the referenced and modified etc bits 61037c478bd9Sstevel@tonic-gate * in the PSM part of the page struct 61047c478bd9Sstevel@tonic-gate * when no locking is desired. 61057c478bd9Sstevel@tonic-gate */ 61067c478bd9Sstevel@tonic-gate void 61077c478bd9Sstevel@tonic-gate page_set_props(page_t *pp, uint_t flags) 61087c478bd9Sstevel@tonic-gate { 61097c478bd9Sstevel@tonic-gate ASSERT((flags & ~(P_MOD | P_REF | P_RO)) == 0); 61107c478bd9Sstevel@tonic-gate pp->p_nrm |= (uchar_t)flags; 61117c478bd9Sstevel@tonic-gate } 61127c478bd9Sstevel@tonic-gate 61137c478bd9Sstevel@tonic-gate void 61147c478bd9Sstevel@tonic-gate page_clr_all_props(page_t *pp) 61157c478bd9Sstevel@tonic-gate { 61167c478bd9Sstevel@tonic-gate pp->p_nrm = 0; 61177c478bd9Sstevel@tonic-gate } 61187c478bd9Sstevel@tonic-gate 61197c478bd9Sstevel@tonic-gate /* 6120db874c57Selowe * Clear p_lckcnt and p_cowcnt, adjusting freemem if required. 61217c478bd9Sstevel@tonic-gate */ 61227c478bd9Sstevel@tonic-gate int 6123db874c57Selowe page_clear_lck_cow(page_t *pp, int adjust) 61247c478bd9Sstevel@tonic-gate { 6125db874c57Selowe int f_amount; 61267c478bd9Sstevel@tonic-gate 6127db874c57Selowe ASSERT(PAGE_EXCL(pp)); 61287c478bd9Sstevel@tonic-gate 61297c478bd9Sstevel@tonic-gate /* 6130db874c57Selowe * The page_struct_lock need not be acquired here since 6131db874c57Selowe * we require the caller hold the page exclusively locked. 61327c478bd9Sstevel@tonic-gate */ 6133db874c57Selowe f_amount = 0; 6134db874c57Selowe if (pp->p_lckcnt) { 6135db874c57Selowe f_amount = 1; 6136db874c57Selowe pp->p_lckcnt = 0; 6137db874c57Selowe } 6138db874c57Selowe if (pp->p_cowcnt) { 6139db874c57Selowe f_amount += pp->p_cowcnt; 6140db874c57Selowe pp->p_cowcnt = 0; 6141db874c57Selowe } 61427c478bd9Sstevel@tonic-gate 6143db874c57Selowe if (adjust && f_amount) { 6144db874c57Selowe mutex_enter(&freemem_lock); 6145db874c57Selowe availrmem += f_amount; 6146db874c57Selowe mutex_exit(&freemem_lock); 61477c478bd9Sstevel@tonic-gate } 61487c478bd9Sstevel@tonic-gate 6149db874c57Selowe return (f_amount); 61507c478bd9Sstevel@tonic-gate } 61517c478bd9Sstevel@tonic-gate 61527c478bd9Sstevel@tonic-gate /* 6153db874c57Selowe * The following functions is called from free_vp_pages() 6154db874c57Selowe * for an inexact estimate of a newly free'd page... 61557c478bd9Sstevel@tonic-gate */ 6156db874c57Selowe ulong_t 6157db874c57Selowe page_share_cnt(page_t *pp) 6158db874c57Selowe { 6159db874c57Selowe return (hat_page_getshare(pp)); 6160db874c57Selowe } 6161db874c57Selowe 61627c478bd9Sstevel@tonic-gate int 61637c478bd9Sstevel@tonic-gate page_isshared(page_t *pp) 61647c478bd9Sstevel@tonic-gate { 61657c478bd9Sstevel@tonic-gate return (hat_page_getshare(pp) > 1); 61667c478bd9Sstevel@tonic-gate } 61677c478bd9Sstevel@tonic-gate 61687c478bd9Sstevel@tonic-gate int 61697c478bd9Sstevel@tonic-gate page_isfree(page_t *pp) 61707c478bd9Sstevel@tonic-gate { 61717c478bd9Sstevel@tonic-gate return (PP_ISFREE(pp)); 61727c478bd9Sstevel@tonic-gate } 61737c478bd9Sstevel@tonic-gate 61747c478bd9Sstevel@tonic-gate int 61757c478bd9Sstevel@tonic-gate page_isref(page_t *pp) 61767c478bd9Sstevel@tonic-gate { 61777c478bd9Sstevel@tonic-gate return (hat_page_getattr(pp, P_REF)); 61787c478bd9Sstevel@tonic-gate } 61797c478bd9Sstevel@tonic-gate 61807c478bd9Sstevel@tonic-gate int 61817c478bd9Sstevel@tonic-gate page_ismod(page_t *pp) 61827c478bd9Sstevel@tonic-gate { 61837c478bd9Sstevel@tonic-gate return (hat_page_getattr(pp, P_MOD)); 61847c478bd9Sstevel@tonic-gate } 6185