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 5ab761399Sesaxe * Common Development and Distribution License (the "License"). 6ab761399Sesaxe * 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 /* 22*0e751525SEric Saxe * Copyright 2009 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) 1984, 1986, 1987, 1988, 1989 AT&T */ 277c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate #include <sys/types.h> 317c478bd9Sstevel@tonic-gate #include <sys/param.h> 327c478bd9Sstevel@tonic-gate #include <sys/sysmacros.h> 337c478bd9Sstevel@tonic-gate #include <sys/signal.h> 347c478bd9Sstevel@tonic-gate #include <sys/user.h> 357c478bd9Sstevel@tonic-gate #include <sys/systm.h> 367c478bd9Sstevel@tonic-gate #include <sys/sysinfo.h> 377c478bd9Sstevel@tonic-gate #include <sys/var.h> 387c478bd9Sstevel@tonic-gate #include <sys/errno.h> 397c478bd9Sstevel@tonic-gate #include <sys/cmn_err.h> 407c478bd9Sstevel@tonic-gate #include <sys/debug.h> 417c478bd9Sstevel@tonic-gate #include <sys/inline.h> 427c478bd9Sstevel@tonic-gate #include <sys/disp.h> 437c478bd9Sstevel@tonic-gate #include <sys/class.h> 447c478bd9Sstevel@tonic-gate #include <sys/bitmap.h> 457c478bd9Sstevel@tonic-gate #include <sys/kmem.h> 467c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 477c478bd9Sstevel@tonic-gate #include <sys/vtrace.h> 487c478bd9Sstevel@tonic-gate #include <sys/tnf.h> 497c478bd9Sstevel@tonic-gate #include <sys/cpupart.h> 507c478bd9Sstevel@tonic-gate #include <sys/lgrp.h> 51fb2f18f8Sesaxe #include <sys/pg.h> 52fb2f18f8Sesaxe #include <sys/cmt.h> 53fb2f18f8Sesaxe #include <sys/bitset.h> 547c478bd9Sstevel@tonic-gate #include <sys/schedctl.h> 557c478bd9Sstevel@tonic-gate #include <sys/atomic.h> 567c478bd9Sstevel@tonic-gate #include <sys/dtrace.h> 577c478bd9Sstevel@tonic-gate #include <sys/sdt.h> 58057452c6Sjj #include <sys/archsystm.h> 597c478bd9Sstevel@tonic-gate 607c478bd9Sstevel@tonic-gate #include <vm/as.h> 617c478bd9Sstevel@tonic-gate 627c478bd9Sstevel@tonic-gate #define BOUND_CPU 0x1 637c478bd9Sstevel@tonic-gate #define BOUND_PARTITION 0x2 647c478bd9Sstevel@tonic-gate #define BOUND_INTR 0x4 657c478bd9Sstevel@tonic-gate 667c478bd9Sstevel@tonic-gate /* Dispatch queue allocation structure and functions */ 677c478bd9Sstevel@tonic-gate struct disp_queue_info { 687c478bd9Sstevel@tonic-gate disp_t *dp; 697c478bd9Sstevel@tonic-gate dispq_t *olddispq; 707c478bd9Sstevel@tonic-gate dispq_t *newdispq; 717c478bd9Sstevel@tonic-gate ulong_t *olddqactmap; 727c478bd9Sstevel@tonic-gate ulong_t *newdqactmap; 737c478bd9Sstevel@tonic-gate int oldnglobpris; 747c478bd9Sstevel@tonic-gate }; 757c478bd9Sstevel@tonic-gate static void disp_dq_alloc(struct disp_queue_info *dptr, int numpris, 767c478bd9Sstevel@tonic-gate disp_t *dp); 777c478bd9Sstevel@tonic-gate static void disp_dq_assign(struct disp_queue_info *dptr, int numpris); 787c478bd9Sstevel@tonic-gate static void disp_dq_free(struct disp_queue_info *dptr); 797c478bd9Sstevel@tonic-gate 807c478bd9Sstevel@tonic-gate /* platform-specific routine to call when processor is idle */ 817c478bd9Sstevel@tonic-gate static void generic_idle_cpu(); 827c478bd9Sstevel@tonic-gate void (*idle_cpu)() = generic_idle_cpu; 837c478bd9Sstevel@tonic-gate 847c478bd9Sstevel@tonic-gate /* routines invoked when a CPU enters/exits the idle loop */ 857c478bd9Sstevel@tonic-gate static void idle_enter(); 867c478bd9Sstevel@tonic-gate static void idle_exit(); 877c478bd9Sstevel@tonic-gate 887c478bd9Sstevel@tonic-gate /* platform-specific routine to call when thread is enqueued */ 897c478bd9Sstevel@tonic-gate static void generic_enq_thread(cpu_t *, int); 907c478bd9Sstevel@tonic-gate void (*disp_enq_thread)(cpu_t *, int) = generic_enq_thread; 917c478bd9Sstevel@tonic-gate 92685679f7Sakolb pri_t kpreemptpri; /* priority where kernel preemption applies */ 93685679f7Sakolb pri_t upreemptpri = 0; /* priority where normal preemption applies */ 94685679f7Sakolb pri_t intr_pri; /* interrupt thread priority base level */ 957c478bd9Sstevel@tonic-gate 96685679f7Sakolb #define KPQPRI -1 /* pri where cpu affinity is dropped for kpq */ 97685679f7Sakolb pri_t kpqpri = KPQPRI; /* can be set in /etc/system */ 98685679f7Sakolb disp_t cpu0_disp; /* boot CPU's dispatch queue */ 997c478bd9Sstevel@tonic-gate disp_lock_t swapped_lock; /* lock swapped threads and swap queue */ 100685679f7Sakolb int nswapped; /* total number of swapped threads */ 1017c478bd9Sstevel@tonic-gate void disp_swapped_enq(kthread_t *tp); 1027c478bd9Sstevel@tonic-gate static void disp_swapped_setrun(kthread_t *tp); 1037c478bd9Sstevel@tonic-gate static void cpu_resched(cpu_t *cp, pri_t tpri); 1047c478bd9Sstevel@tonic-gate 1057c478bd9Sstevel@tonic-gate /* 1067c478bd9Sstevel@tonic-gate * If this is set, only interrupt threads will cause kernel preemptions. 1077c478bd9Sstevel@tonic-gate * This is done by changing the value of kpreemptpri. kpreemptpri 1087c478bd9Sstevel@tonic-gate * will either be the max sysclass pri + 1 or the min interrupt pri. 1097c478bd9Sstevel@tonic-gate */ 1107c478bd9Sstevel@tonic-gate int only_intr_kpreempt; 1117c478bd9Sstevel@tonic-gate 1127c478bd9Sstevel@tonic-gate extern void set_idle_cpu(int cpun); 1137c478bd9Sstevel@tonic-gate extern void unset_idle_cpu(int cpun); 1147c478bd9Sstevel@tonic-gate static void setkpdq(kthread_t *tp, int borf); 1157c478bd9Sstevel@tonic-gate #define SETKP_BACK 0 1167c478bd9Sstevel@tonic-gate #define SETKP_FRONT 1 1177c478bd9Sstevel@tonic-gate /* 1187c478bd9Sstevel@tonic-gate * Parameter that determines how recently a thread must have run 1197c478bd9Sstevel@tonic-gate * on the CPU to be considered loosely-bound to that CPU to reduce 1207c478bd9Sstevel@tonic-gate * cold cache effects. The interval is in hertz. 1217c478bd9Sstevel@tonic-gate */ 122fb2f18f8Sesaxe #define RECHOOSE_INTERVAL 3 1237c478bd9Sstevel@tonic-gate int rechoose_interval = RECHOOSE_INTERVAL; 1247c478bd9Sstevel@tonic-gate 125685679f7Sakolb /* 126685679f7Sakolb * Parameter that determines how long (in nanoseconds) a thread must 127685679f7Sakolb * be sitting on a run queue before it can be stolen by another CPU 128685679f7Sakolb * to reduce migrations. The interval is in nanoseconds. 129685679f7Sakolb * 13081588590Sbholler * The nosteal_nsec should be set by platform code cmp_set_nosteal_interval() 13181588590Sbholler * to an appropriate value. nosteal_nsec is set to NOSTEAL_UNINITIALIZED 13281588590Sbholler * here indicating it is uninitiallized. 13381588590Sbholler * Setting nosteal_nsec to 0 effectively disables the nosteal 'protection'. 13481588590Sbholler * 135685679f7Sakolb */ 13681588590Sbholler #define NOSTEAL_UNINITIALIZED (-1) 13781588590Sbholler hrtime_t nosteal_nsec = NOSTEAL_UNINITIALIZED; 13881588590Sbholler extern void cmp_set_nosteal_interval(void); 139685679f7Sakolb 1407c478bd9Sstevel@tonic-gate id_t defaultcid; /* system "default" class; see dispadmin(1M) */ 1417c478bd9Sstevel@tonic-gate 1427c478bd9Sstevel@tonic-gate disp_lock_t transition_lock; /* lock on transitioning threads */ 1437c478bd9Sstevel@tonic-gate disp_lock_t stop_lock; /* lock on stopped threads */ 1447c478bd9Sstevel@tonic-gate 145685679f7Sakolb static void cpu_dispqalloc(int numpris); 146685679f7Sakolb 147685679f7Sakolb /* 148685679f7Sakolb * This gets returned by disp_getwork/disp_getbest if we couldn't steal 149685679f7Sakolb * a thread because it was sitting on its run queue for a very short 150685679f7Sakolb * period of time. 151685679f7Sakolb */ 152685679f7Sakolb #define T_DONTSTEAL (kthread_t *)(-1) /* returned by disp_getwork/getbest */ 1537c478bd9Sstevel@tonic-gate 1547c478bd9Sstevel@tonic-gate static kthread_t *disp_getwork(cpu_t *to); 1557c478bd9Sstevel@tonic-gate static kthread_t *disp_getbest(disp_t *from); 1567c478bd9Sstevel@tonic-gate static kthread_t *disp_ratify(kthread_t *tp, disp_t *kpq); 1577c478bd9Sstevel@tonic-gate 1587c478bd9Sstevel@tonic-gate void swtch_to(kthread_t *); 1597c478bd9Sstevel@tonic-gate 1607c478bd9Sstevel@tonic-gate /* 1617c478bd9Sstevel@tonic-gate * dispatcher and scheduler initialization 1627c478bd9Sstevel@tonic-gate */ 1637c478bd9Sstevel@tonic-gate 1647c478bd9Sstevel@tonic-gate /* 1657c478bd9Sstevel@tonic-gate * disp_setup - Common code to calculate and allocate dispatcher 1667c478bd9Sstevel@tonic-gate * variables and structures based on the maximum priority. 1677c478bd9Sstevel@tonic-gate */ 1687c478bd9Sstevel@tonic-gate static void 1697c478bd9Sstevel@tonic-gate disp_setup(pri_t maxglobpri, pri_t oldnglobpris) 1707c478bd9Sstevel@tonic-gate { 1717c478bd9Sstevel@tonic-gate pri_t newnglobpris; 1727c478bd9Sstevel@tonic-gate 1737c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(&cpu_lock)); 1747c478bd9Sstevel@tonic-gate 1757c478bd9Sstevel@tonic-gate newnglobpris = maxglobpri + 1 + LOCK_LEVEL; 1767c478bd9Sstevel@tonic-gate 1777c478bd9Sstevel@tonic-gate if (newnglobpris > oldnglobpris) { 1787c478bd9Sstevel@tonic-gate /* 1797c478bd9Sstevel@tonic-gate * Allocate new kp queues for each CPU partition. 1807c478bd9Sstevel@tonic-gate */ 1817c478bd9Sstevel@tonic-gate cpupart_kpqalloc(newnglobpris); 1827c478bd9Sstevel@tonic-gate 1837c478bd9Sstevel@tonic-gate /* 1847c478bd9Sstevel@tonic-gate * Allocate new dispatch queues for each CPU. 1857c478bd9Sstevel@tonic-gate */ 1867c478bd9Sstevel@tonic-gate cpu_dispqalloc(newnglobpris); 1877c478bd9Sstevel@tonic-gate 1887c478bd9Sstevel@tonic-gate /* 1897c478bd9Sstevel@tonic-gate * compute new interrupt thread base priority 1907c478bd9Sstevel@tonic-gate */ 1917c478bd9Sstevel@tonic-gate intr_pri = maxglobpri; 1927c478bd9Sstevel@tonic-gate if (only_intr_kpreempt) { 1937c478bd9Sstevel@tonic-gate kpreemptpri = intr_pri + 1; 1947c478bd9Sstevel@tonic-gate if (kpqpri == KPQPRI) 1957c478bd9Sstevel@tonic-gate kpqpri = kpreemptpri; 1967c478bd9Sstevel@tonic-gate } 1977c478bd9Sstevel@tonic-gate v.v_nglobpris = newnglobpris; 1987c478bd9Sstevel@tonic-gate } 1997c478bd9Sstevel@tonic-gate } 2007c478bd9Sstevel@tonic-gate 2017c478bd9Sstevel@tonic-gate /* 2027c478bd9Sstevel@tonic-gate * dispinit - Called to initialize all loaded classes and the 2037c478bd9Sstevel@tonic-gate * dispatcher framework. 2047c478bd9Sstevel@tonic-gate */ 2057c478bd9Sstevel@tonic-gate void 2067c478bd9Sstevel@tonic-gate dispinit(void) 2077c478bd9Sstevel@tonic-gate { 2087c478bd9Sstevel@tonic-gate id_t cid; 2097c478bd9Sstevel@tonic-gate pri_t maxglobpri; 2107c478bd9Sstevel@tonic-gate pri_t cl_maxglobpri; 2117c478bd9Sstevel@tonic-gate 2127c478bd9Sstevel@tonic-gate maxglobpri = -1; 2137c478bd9Sstevel@tonic-gate 2147c478bd9Sstevel@tonic-gate /* 2157c478bd9Sstevel@tonic-gate * Initialize transition lock, which will always be set. 2167c478bd9Sstevel@tonic-gate */ 2177c478bd9Sstevel@tonic-gate DISP_LOCK_INIT(&transition_lock); 2187c478bd9Sstevel@tonic-gate disp_lock_enter_high(&transition_lock); 2197c478bd9Sstevel@tonic-gate DISP_LOCK_INIT(&stop_lock); 2207c478bd9Sstevel@tonic-gate 2217c478bd9Sstevel@tonic-gate mutex_enter(&cpu_lock); 2227c478bd9Sstevel@tonic-gate CPU->cpu_disp->disp_maxrunpri = -1; 2237c478bd9Sstevel@tonic-gate CPU->cpu_disp->disp_max_unbound_pri = -1; 224fb2f18f8Sesaxe 2257c478bd9Sstevel@tonic-gate /* 2267c478bd9Sstevel@tonic-gate * Initialize the default CPU partition. 2277c478bd9Sstevel@tonic-gate */ 2287c478bd9Sstevel@tonic-gate cpupart_initialize_default(); 2297c478bd9Sstevel@tonic-gate /* 2307c478bd9Sstevel@tonic-gate * Call the class specific initialization functions for 2317c478bd9Sstevel@tonic-gate * all pre-installed schedulers. 2327c478bd9Sstevel@tonic-gate * 2337c478bd9Sstevel@tonic-gate * We pass the size of a class specific parameter 2347c478bd9Sstevel@tonic-gate * buffer to each of the initialization functions 2357c478bd9Sstevel@tonic-gate * to try to catch problems with backward compatibility 2367c478bd9Sstevel@tonic-gate * of class modules. 2377c478bd9Sstevel@tonic-gate * 2387c478bd9Sstevel@tonic-gate * For example a new class module running on an old system 2397c478bd9Sstevel@tonic-gate * which didn't provide sufficiently large parameter buffers 2407c478bd9Sstevel@tonic-gate * would be bad news. Class initialization modules can check for 2417c478bd9Sstevel@tonic-gate * this and take action if they detect a problem. 2427c478bd9Sstevel@tonic-gate */ 2437c478bd9Sstevel@tonic-gate 2447c478bd9Sstevel@tonic-gate for (cid = 0; cid < nclass; cid++) { 2457c478bd9Sstevel@tonic-gate sclass_t *sc; 2467c478bd9Sstevel@tonic-gate 2477c478bd9Sstevel@tonic-gate sc = &sclass[cid]; 2487c478bd9Sstevel@tonic-gate if (SCHED_INSTALLED(sc)) { 2497c478bd9Sstevel@tonic-gate cl_maxglobpri = sc->cl_init(cid, PC_CLPARMSZ, 2507c478bd9Sstevel@tonic-gate &sc->cl_funcs); 2517c478bd9Sstevel@tonic-gate if (cl_maxglobpri > maxglobpri) 2527c478bd9Sstevel@tonic-gate maxglobpri = cl_maxglobpri; 2537c478bd9Sstevel@tonic-gate } 2547c478bd9Sstevel@tonic-gate } 2557c478bd9Sstevel@tonic-gate kpreemptpri = (pri_t)v.v_maxsyspri + 1; 2567c478bd9Sstevel@tonic-gate if (kpqpri == KPQPRI) 2577c478bd9Sstevel@tonic-gate kpqpri = kpreemptpri; 2587c478bd9Sstevel@tonic-gate 2597c478bd9Sstevel@tonic-gate ASSERT(maxglobpri >= 0); 2607c478bd9Sstevel@tonic-gate disp_setup(maxglobpri, 0); 2617c478bd9Sstevel@tonic-gate 2627c478bd9Sstevel@tonic-gate mutex_exit(&cpu_lock); 2637c478bd9Sstevel@tonic-gate 26481588590Sbholler /* 26581588590Sbholler * Platform specific sticky scheduler setup. 26681588590Sbholler */ 26781588590Sbholler if (nosteal_nsec == NOSTEAL_UNINITIALIZED) 26881588590Sbholler cmp_set_nosteal_interval(); 26981588590Sbholler 2707c478bd9Sstevel@tonic-gate /* 2717c478bd9Sstevel@tonic-gate * Get the default class ID; this may be later modified via 2727c478bd9Sstevel@tonic-gate * dispadmin(1M). This will load the class (normally TS) and that will 2737c478bd9Sstevel@tonic-gate * call disp_add(), which is why we had to drop cpu_lock first. 2747c478bd9Sstevel@tonic-gate */ 2757c478bd9Sstevel@tonic-gate if (getcid(defaultclass, &defaultcid) != 0) { 2767c478bd9Sstevel@tonic-gate cmn_err(CE_PANIC, "Couldn't load default scheduling class '%s'", 2777c478bd9Sstevel@tonic-gate defaultclass); 2787c478bd9Sstevel@tonic-gate } 2797c478bd9Sstevel@tonic-gate } 2807c478bd9Sstevel@tonic-gate 2817c478bd9Sstevel@tonic-gate /* 2827c478bd9Sstevel@tonic-gate * disp_add - Called with class pointer to initialize the dispatcher 2837c478bd9Sstevel@tonic-gate * for a newly loaded class. 2847c478bd9Sstevel@tonic-gate */ 2857c478bd9Sstevel@tonic-gate void 2867c478bd9Sstevel@tonic-gate disp_add(sclass_t *clp) 2877c478bd9Sstevel@tonic-gate { 2887c478bd9Sstevel@tonic-gate pri_t maxglobpri; 2897c478bd9Sstevel@tonic-gate pri_t cl_maxglobpri; 2907c478bd9Sstevel@tonic-gate 2917c478bd9Sstevel@tonic-gate mutex_enter(&cpu_lock); 2927c478bd9Sstevel@tonic-gate /* 2937c478bd9Sstevel@tonic-gate * Initialize the scheduler class. 2947c478bd9Sstevel@tonic-gate */ 2957c478bd9Sstevel@tonic-gate maxglobpri = (pri_t)(v.v_nglobpris - LOCK_LEVEL - 1); 2967c478bd9Sstevel@tonic-gate cl_maxglobpri = clp->cl_init(clp - sclass, PC_CLPARMSZ, &clp->cl_funcs); 2977c478bd9Sstevel@tonic-gate if (cl_maxglobpri > maxglobpri) 2987c478bd9Sstevel@tonic-gate maxglobpri = cl_maxglobpri; 2997c478bd9Sstevel@tonic-gate 3007c478bd9Sstevel@tonic-gate /* 3017c478bd9Sstevel@tonic-gate * Save old queue information. Since we're initializing a 3027c478bd9Sstevel@tonic-gate * new scheduling class which has just been loaded, then 3037c478bd9Sstevel@tonic-gate * the size of the dispq may have changed. We need to handle 3047c478bd9Sstevel@tonic-gate * that here. 3057c478bd9Sstevel@tonic-gate */ 3067c478bd9Sstevel@tonic-gate disp_setup(maxglobpri, v.v_nglobpris); 3077c478bd9Sstevel@tonic-gate 3087c478bd9Sstevel@tonic-gate mutex_exit(&cpu_lock); 3097c478bd9Sstevel@tonic-gate } 3107c478bd9Sstevel@tonic-gate 3117c478bd9Sstevel@tonic-gate 3127c478bd9Sstevel@tonic-gate /* 3137c478bd9Sstevel@tonic-gate * For each CPU, allocate new dispatch queues 3147c478bd9Sstevel@tonic-gate * with the stated number of priorities. 3157c478bd9Sstevel@tonic-gate */ 3167c478bd9Sstevel@tonic-gate static void 3177c478bd9Sstevel@tonic-gate cpu_dispqalloc(int numpris) 3187c478bd9Sstevel@tonic-gate { 3197c478bd9Sstevel@tonic-gate cpu_t *cpup; 3207c478bd9Sstevel@tonic-gate struct disp_queue_info *disp_mem; 3217c478bd9Sstevel@tonic-gate int i, num; 3227c478bd9Sstevel@tonic-gate 3237c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(&cpu_lock)); 3247c478bd9Sstevel@tonic-gate 3257c478bd9Sstevel@tonic-gate disp_mem = kmem_zalloc(NCPU * 3267c478bd9Sstevel@tonic-gate sizeof (struct disp_queue_info), KM_SLEEP); 3277c478bd9Sstevel@tonic-gate 3287c478bd9Sstevel@tonic-gate /* 3297c478bd9Sstevel@tonic-gate * This routine must allocate all of the memory before stopping 3307c478bd9Sstevel@tonic-gate * the cpus because it must not sleep in kmem_alloc while the 3317c478bd9Sstevel@tonic-gate * CPUs are stopped. Locks they hold will not be freed until they 3327c478bd9Sstevel@tonic-gate * are restarted. 3337c478bd9Sstevel@tonic-gate */ 3347c478bd9Sstevel@tonic-gate i = 0; 3357c478bd9Sstevel@tonic-gate cpup = cpu_list; 3367c478bd9Sstevel@tonic-gate do { 3377c478bd9Sstevel@tonic-gate disp_dq_alloc(&disp_mem[i], numpris, cpup->cpu_disp); 3387c478bd9Sstevel@tonic-gate i++; 3397c478bd9Sstevel@tonic-gate cpup = cpup->cpu_next; 3407c478bd9Sstevel@tonic-gate } while (cpup != cpu_list); 3417c478bd9Sstevel@tonic-gate num = i; 3427c478bd9Sstevel@tonic-gate 3437c478bd9Sstevel@tonic-gate pause_cpus(NULL); 3447c478bd9Sstevel@tonic-gate for (i = 0; i < num; i++) 3457c478bd9Sstevel@tonic-gate disp_dq_assign(&disp_mem[i], numpris); 3467c478bd9Sstevel@tonic-gate start_cpus(); 3477c478bd9Sstevel@tonic-gate 3487c478bd9Sstevel@tonic-gate /* 3497c478bd9Sstevel@tonic-gate * I must free all of the memory after starting the cpus because 3507c478bd9Sstevel@tonic-gate * I can not risk sleeping in kmem_free while the cpus are stopped. 3517c478bd9Sstevel@tonic-gate */ 3527c478bd9Sstevel@tonic-gate for (i = 0; i < num; i++) 3537c478bd9Sstevel@tonic-gate disp_dq_free(&disp_mem[i]); 3547c478bd9Sstevel@tonic-gate 3557c478bd9Sstevel@tonic-gate kmem_free(disp_mem, NCPU * sizeof (struct disp_queue_info)); 3567c478bd9Sstevel@tonic-gate } 3577c478bd9Sstevel@tonic-gate 3587c478bd9Sstevel@tonic-gate static void 3597c478bd9Sstevel@tonic-gate disp_dq_alloc(struct disp_queue_info *dptr, int numpris, disp_t *dp) 3607c478bd9Sstevel@tonic-gate { 3617c478bd9Sstevel@tonic-gate dptr->newdispq = kmem_zalloc(numpris * sizeof (dispq_t), KM_SLEEP); 3627c478bd9Sstevel@tonic-gate dptr->newdqactmap = kmem_zalloc(((numpris / BT_NBIPUL) + 1) * 3637c478bd9Sstevel@tonic-gate sizeof (long), KM_SLEEP); 3647c478bd9Sstevel@tonic-gate dptr->dp = dp; 3657c478bd9Sstevel@tonic-gate } 3667c478bd9Sstevel@tonic-gate 3677c478bd9Sstevel@tonic-gate static void 3687c478bd9Sstevel@tonic-gate disp_dq_assign(struct disp_queue_info *dptr, int numpris) 3697c478bd9Sstevel@tonic-gate { 3707c478bd9Sstevel@tonic-gate disp_t *dp; 3717c478bd9Sstevel@tonic-gate 3727c478bd9Sstevel@tonic-gate dp = dptr->dp; 3737c478bd9Sstevel@tonic-gate dptr->olddispq = dp->disp_q; 3747c478bd9Sstevel@tonic-gate dptr->olddqactmap = dp->disp_qactmap; 3757c478bd9Sstevel@tonic-gate dptr->oldnglobpris = dp->disp_npri; 3767c478bd9Sstevel@tonic-gate 3777c478bd9Sstevel@tonic-gate ASSERT(dptr->oldnglobpris < numpris); 3787c478bd9Sstevel@tonic-gate 3797c478bd9Sstevel@tonic-gate if (dptr->olddispq != NULL) { 3807c478bd9Sstevel@tonic-gate /* 3817c478bd9Sstevel@tonic-gate * Use kcopy because bcopy is platform-specific 3827c478bd9Sstevel@tonic-gate * and could block while we might have paused the cpus. 3837c478bd9Sstevel@tonic-gate */ 3847c478bd9Sstevel@tonic-gate (void) kcopy(dptr->olddispq, dptr->newdispq, 3857c478bd9Sstevel@tonic-gate dptr->oldnglobpris * sizeof (dispq_t)); 3867c478bd9Sstevel@tonic-gate (void) kcopy(dptr->olddqactmap, dptr->newdqactmap, 3877c478bd9Sstevel@tonic-gate ((dptr->oldnglobpris / BT_NBIPUL) + 1) * 3887c478bd9Sstevel@tonic-gate sizeof (long)); 3897c478bd9Sstevel@tonic-gate } 3907c478bd9Sstevel@tonic-gate dp->disp_q = dptr->newdispq; 3917c478bd9Sstevel@tonic-gate dp->disp_qactmap = dptr->newdqactmap; 3927c478bd9Sstevel@tonic-gate dp->disp_q_limit = &dptr->newdispq[numpris]; 3937c478bd9Sstevel@tonic-gate dp->disp_npri = numpris; 3947c478bd9Sstevel@tonic-gate } 3957c478bd9Sstevel@tonic-gate 3967c478bd9Sstevel@tonic-gate static void 3977c478bd9Sstevel@tonic-gate disp_dq_free(struct disp_queue_info *dptr) 3987c478bd9Sstevel@tonic-gate { 3997c478bd9Sstevel@tonic-gate if (dptr->olddispq != NULL) 4007c478bd9Sstevel@tonic-gate kmem_free(dptr->olddispq, 4017c478bd9Sstevel@tonic-gate dptr->oldnglobpris * sizeof (dispq_t)); 4027c478bd9Sstevel@tonic-gate if (dptr->olddqactmap != NULL) 4037c478bd9Sstevel@tonic-gate kmem_free(dptr->olddqactmap, 4047c478bd9Sstevel@tonic-gate ((dptr->oldnglobpris / BT_NBIPUL) + 1) * sizeof (long)); 4057c478bd9Sstevel@tonic-gate } 4067c478bd9Sstevel@tonic-gate 4077c478bd9Sstevel@tonic-gate /* 4087c478bd9Sstevel@tonic-gate * For a newly created CPU, initialize the dispatch queue. 4097c478bd9Sstevel@tonic-gate * This is called before the CPU is known through cpu[] or on any lists. 4107c478bd9Sstevel@tonic-gate */ 4117c478bd9Sstevel@tonic-gate void 4127c478bd9Sstevel@tonic-gate disp_cpu_init(cpu_t *cp) 4137c478bd9Sstevel@tonic-gate { 4147c478bd9Sstevel@tonic-gate disp_t *dp; 4157c478bd9Sstevel@tonic-gate dispq_t *newdispq; 4167c478bd9Sstevel@tonic-gate ulong_t *newdqactmap; 4177c478bd9Sstevel@tonic-gate 4187c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(&cpu_lock)); /* protect dispatcher queue sizes */ 4197c478bd9Sstevel@tonic-gate 4207c478bd9Sstevel@tonic-gate if (cp == cpu0_disp.disp_cpu) 4217c478bd9Sstevel@tonic-gate dp = &cpu0_disp; 4227c478bd9Sstevel@tonic-gate else 4237c478bd9Sstevel@tonic-gate dp = kmem_alloc(sizeof (disp_t), KM_SLEEP); 4247c478bd9Sstevel@tonic-gate bzero(dp, sizeof (disp_t)); 4257c478bd9Sstevel@tonic-gate cp->cpu_disp = dp; 4267c478bd9Sstevel@tonic-gate dp->disp_cpu = cp; 4277c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = -1; 4287c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = -1; 4297c478bd9Sstevel@tonic-gate DISP_LOCK_INIT(&cp->cpu_thread_lock); 4307c478bd9Sstevel@tonic-gate /* 4317c478bd9Sstevel@tonic-gate * Allocate memory for the dispatcher queue headers 4327c478bd9Sstevel@tonic-gate * and the active queue bitmap. 4337c478bd9Sstevel@tonic-gate */ 4347c478bd9Sstevel@tonic-gate newdispq = kmem_zalloc(v.v_nglobpris * sizeof (dispq_t), KM_SLEEP); 4357c478bd9Sstevel@tonic-gate newdqactmap = kmem_zalloc(((v.v_nglobpris / BT_NBIPUL) + 1) * 4367c478bd9Sstevel@tonic-gate sizeof (long), KM_SLEEP); 4377c478bd9Sstevel@tonic-gate dp->disp_q = newdispq; 4387c478bd9Sstevel@tonic-gate dp->disp_qactmap = newdqactmap; 4397c478bd9Sstevel@tonic-gate dp->disp_q_limit = &newdispq[v.v_nglobpris]; 4407c478bd9Sstevel@tonic-gate dp->disp_npri = v.v_nglobpris; 4417c478bd9Sstevel@tonic-gate } 4427c478bd9Sstevel@tonic-gate 4437c478bd9Sstevel@tonic-gate void 4447c478bd9Sstevel@tonic-gate disp_cpu_fini(cpu_t *cp) 4457c478bd9Sstevel@tonic-gate { 4467c478bd9Sstevel@tonic-gate ASSERT(MUTEX_HELD(&cpu_lock)); 4477c478bd9Sstevel@tonic-gate 4487c478bd9Sstevel@tonic-gate disp_kp_free(cp->cpu_disp); 4497c478bd9Sstevel@tonic-gate if (cp->cpu_disp != &cpu0_disp) 4507c478bd9Sstevel@tonic-gate kmem_free(cp->cpu_disp, sizeof (disp_t)); 4517c478bd9Sstevel@tonic-gate } 4527c478bd9Sstevel@tonic-gate 4537c478bd9Sstevel@tonic-gate /* 4547c478bd9Sstevel@tonic-gate * Allocate new, larger kpreempt dispatch queue to replace the old one. 4557c478bd9Sstevel@tonic-gate */ 4567c478bd9Sstevel@tonic-gate void 4577c478bd9Sstevel@tonic-gate disp_kp_alloc(disp_t *dq, pri_t npri) 4587c478bd9Sstevel@tonic-gate { 4597c478bd9Sstevel@tonic-gate struct disp_queue_info mem_info; 4607c478bd9Sstevel@tonic-gate 4617c478bd9Sstevel@tonic-gate if (npri > dq->disp_npri) { 4627c478bd9Sstevel@tonic-gate /* 4637c478bd9Sstevel@tonic-gate * Allocate memory for the new array. 4647c478bd9Sstevel@tonic-gate */ 4657c478bd9Sstevel@tonic-gate disp_dq_alloc(&mem_info, npri, dq); 4667c478bd9Sstevel@tonic-gate 4677c478bd9Sstevel@tonic-gate /* 4687c478bd9Sstevel@tonic-gate * We need to copy the old structures to the new 4697c478bd9Sstevel@tonic-gate * and free the old. 4707c478bd9Sstevel@tonic-gate */ 4717c478bd9Sstevel@tonic-gate disp_dq_assign(&mem_info, npri); 4727c478bd9Sstevel@tonic-gate disp_dq_free(&mem_info); 4737c478bd9Sstevel@tonic-gate } 4747c478bd9Sstevel@tonic-gate } 4757c478bd9Sstevel@tonic-gate 4767c478bd9Sstevel@tonic-gate /* 4777c478bd9Sstevel@tonic-gate * Free dispatch queue. 4787c478bd9Sstevel@tonic-gate * Used for the kpreempt queues for a removed CPU partition and 4797c478bd9Sstevel@tonic-gate * for the per-CPU queues of deleted CPUs. 4807c478bd9Sstevel@tonic-gate */ 4817c478bd9Sstevel@tonic-gate void 4827c478bd9Sstevel@tonic-gate disp_kp_free(disp_t *dq) 4837c478bd9Sstevel@tonic-gate { 4847c478bd9Sstevel@tonic-gate struct disp_queue_info mem_info; 4857c478bd9Sstevel@tonic-gate 4867c478bd9Sstevel@tonic-gate mem_info.olddispq = dq->disp_q; 4877c478bd9Sstevel@tonic-gate mem_info.olddqactmap = dq->disp_qactmap; 4887c478bd9Sstevel@tonic-gate mem_info.oldnglobpris = dq->disp_npri; 4897c478bd9Sstevel@tonic-gate disp_dq_free(&mem_info); 4907c478bd9Sstevel@tonic-gate } 4917c478bd9Sstevel@tonic-gate 4927c478bd9Sstevel@tonic-gate /* 4937c478bd9Sstevel@tonic-gate * End dispatcher and scheduler initialization. 4947c478bd9Sstevel@tonic-gate */ 4957c478bd9Sstevel@tonic-gate 4967c478bd9Sstevel@tonic-gate /* 4977c478bd9Sstevel@tonic-gate * See if there's anything to do other than remain idle. 4987c478bd9Sstevel@tonic-gate * Return non-zero if there is. 4997c478bd9Sstevel@tonic-gate * 5007c478bd9Sstevel@tonic-gate * This function must be called with high spl, or with 5017c478bd9Sstevel@tonic-gate * kernel preemption disabled to prevent the partition's 5027c478bd9Sstevel@tonic-gate * active cpu list from changing while being traversed. 5037c478bd9Sstevel@tonic-gate * 5046890d023SEric Saxe * This is essentially a simpler version of disp_getwork() 5056890d023SEric Saxe * to be called by CPUs preparing to "halt". 5067c478bd9Sstevel@tonic-gate */ 5077c478bd9Sstevel@tonic-gate int 5087c478bd9Sstevel@tonic-gate disp_anywork(void) 5097c478bd9Sstevel@tonic-gate { 5106890d023SEric Saxe cpu_t *cp = CPU; 5116890d023SEric Saxe cpu_t *ocp; 5126890d023SEric Saxe volatile int *local_nrunnable = &cp->cpu_disp->disp_nrunnable; 5137c478bd9Sstevel@tonic-gate 5147c478bd9Sstevel@tonic-gate if (!(cp->cpu_flags & CPU_OFFLINE)) { 5157c478bd9Sstevel@tonic-gate if (CP_MAXRUNPRI(cp->cpu_part) >= 0) 5167c478bd9Sstevel@tonic-gate return (1); 5177c478bd9Sstevel@tonic-gate 5187c478bd9Sstevel@tonic-gate for (ocp = cp->cpu_next_part; ocp != cp; 5197c478bd9Sstevel@tonic-gate ocp = ocp->cpu_next_part) { 5207c478bd9Sstevel@tonic-gate ASSERT(CPU_ACTIVE(ocp)); 5217c478bd9Sstevel@tonic-gate 5226890d023SEric Saxe /* 5236890d023SEric Saxe * Something has appeared on the local run queue. 5246890d023SEric Saxe */ 5256890d023SEric Saxe if (*local_nrunnable > 0) 5266890d023SEric Saxe return (1); 5276890d023SEric Saxe /* 5286890d023SEric Saxe * If we encounter another idle CPU that will 5296890d023SEric Saxe * soon be trolling around through disp_anywork() 5306890d023SEric Saxe * terminate our walk here and let this other CPU 5316890d023SEric Saxe * patrol the next part of the list. 5326890d023SEric Saxe */ 5336890d023SEric Saxe if (ocp->cpu_dispatch_pri == -1 && 5346890d023SEric Saxe (ocp->cpu_disp_flags & CPU_DISP_HALTED) == 0) 5356890d023SEric Saxe return (0); 5366890d023SEric Saxe /* 5376890d023SEric Saxe * Work can be taken from another CPU if: 5386890d023SEric Saxe * - There is unbound work on the run queue 5396890d023SEric Saxe * - That work isn't a thread undergoing a 5406890d023SEric Saxe * - context switch on an otherwise empty queue. 5416890d023SEric Saxe * - The CPU isn't running the idle loop. 5426890d023SEric Saxe */ 5437c478bd9Sstevel@tonic-gate if (ocp->cpu_disp->disp_max_unbound_pri != -1 && 5447c478bd9Sstevel@tonic-gate !((ocp->cpu_disp_flags & CPU_DISP_DONTSTEAL) && 5457c478bd9Sstevel@tonic-gate ocp->cpu_disp->disp_nrunnable == 1) && 5467c478bd9Sstevel@tonic-gate ocp->cpu_dispatch_pri != -1) 5477c478bd9Sstevel@tonic-gate return (1); 5487c478bd9Sstevel@tonic-gate } 5497c478bd9Sstevel@tonic-gate } 5507c478bd9Sstevel@tonic-gate return (0); 5517c478bd9Sstevel@tonic-gate } 5527c478bd9Sstevel@tonic-gate 5537c478bd9Sstevel@tonic-gate /* 5547c478bd9Sstevel@tonic-gate * Called when CPU enters the idle loop 5557c478bd9Sstevel@tonic-gate */ 5567c478bd9Sstevel@tonic-gate static void 5577c478bd9Sstevel@tonic-gate idle_enter() 5587c478bd9Sstevel@tonic-gate { 5597c478bd9Sstevel@tonic-gate cpu_t *cp = CPU; 5607c478bd9Sstevel@tonic-gate 561eda89462Sesolom new_cpu_mstate(CMS_IDLE, gethrtime_unscaled()); 5627c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cp, sys, idlethread, 1); 5637c478bd9Sstevel@tonic-gate set_idle_cpu(cp->cpu_id); /* arch-dependent hook */ 5647c478bd9Sstevel@tonic-gate } 5657c478bd9Sstevel@tonic-gate 5667c478bd9Sstevel@tonic-gate /* 5677c478bd9Sstevel@tonic-gate * Called when CPU exits the idle loop 5687c478bd9Sstevel@tonic-gate */ 5697c478bd9Sstevel@tonic-gate static void 5707c478bd9Sstevel@tonic-gate idle_exit() 5717c478bd9Sstevel@tonic-gate { 5727c478bd9Sstevel@tonic-gate cpu_t *cp = CPU; 5737c478bd9Sstevel@tonic-gate 574eda89462Sesolom new_cpu_mstate(CMS_SYSTEM, gethrtime_unscaled()); 5757c478bd9Sstevel@tonic-gate unset_idle_cpu(cp->cpu_id); /* arch-dependent hook */ 5767c478bd9Sstevel@tonic-gate } 5777c478bd9Sstevel@tonic-gate 5787c478bd9Sstevel@tonic-gate /* 5797c478bd9Sstevel@tonic-gate * Idle loop. 5807c478bd9Sstevel@tonic-gate */ 5817c478bd9Sstevel@tonic-gate void 5827c478bd9Sstevel@tonic-gate idle() 5837c478bd9Sstevel@tonic-gate { 5847c478bd9Sstevel@tonic-gate struct cpu *cp = CPU; /* pointer to this CPU */ 5857c478bd9Sstevel@tonic-gate kthread_t *t; /* taken thread */ 5867c478bd9Sstevel@tonic-gate 5877c478bd9Sstevel@tonic-gate idle_enter(); 5887c478bd9Sstevel@tonic-gate 5897c478bd9Sstevel@tonic-gate /* 5907c478bd9Sstevel@tonic-gate * Uniprocessor version of idle loop. 5917c478bd9Sstevel@tonic-gate * Do this until notified that we're on an actual multiprocessor. 5927c478bd9Sstevel@tonic-gate */ 5937c478bd9Sstevel@tonic-gate while (ncpus == 1) { 5947c478bd9Sstevel@tonic-gate if (cp->cpu_disp->disp_nrunnable == 0) { 5957c478bd9Sstevel@tonic-gate (*idle_cpu)(); 5967c478bd9Sstevel@tonic-gate continue; 5977c478bd9Sstevel@tonic-gate } 5987c478bd9Sstevel@tonic-gate idle_exit(); 5997c478bd9Sstevel@tonic-gate swtch(); 6007c478bd9Sstevel@tonic-gate 6017c478bd9Sstevel@tonic-gate idle_enter(); /* returned from swtch */ 6027c478bd9Sstevel@tonic-gate } 6037c478bd9Sstevel@tonic-gate 6047c478bd9Sstevel@tonic-gate /* 6057c478bd9Sstevel@tonic-gate * Multiprocessor idle loop. 6067c478bd9Sstevel@tonic-gate */ 6077c478bd9Sstevel@tonic-gate for (;;) { 6087c478bd9Sstevel@tonic-gate /* 6097c478bd9Sstevel@tonic-gate * If CPU is completely quiesced by p_online(2), just wait 6107c478bd9Sstevel@tonic-gate * here with minimal bus traffic until put online. 6117c478bd9Sstevel@tonic-gate */ 6127c478bd9Sstevel@tonic-gate while (cp->cpu_flags & CPU_QUIESCED) 6137c478bd9Sstevel@tonic-gate (*idle_cpu)(); 6147c478bd9Sstevel@tonic-gate 6157c478bd9Sstevel@tonic-gate if (cp->cpu_disp->disp_nrunnable != 0) { 6167c478bd9Sstevel@tonic-gate idle_exit(); 6177c478bd9Sstevel@tonic-gate swtch(); 6187c478bd9Sstevel@tonic-gate } else { 6197c478bd9Sstevel@tonic-gate if (cp->cpu_flags & CPU_OFFLINE) 6207c478bd9Sstevel@tonic-gate continue; 6217c478bd9Sstevel@tonic-gate if ((t = disp_getwork(cp)) == NULL) { 6227c478bd9Sstevel@tonic-gate if (cp->cpu_chosen_level != -1) { 6237c478bd9Sstevel@tonic-gate disp_t *dp = cp->cpu_disp; 6247c478bd9Sstevel@tonic-gate disp_t *kpq; 6257c478bd9Sstevel@tonic-gate 6267c478bd9Sstevel@tonic-gate disp_lock_enter(&dp->disp_lock); 6277c478bd9Sstevel@tonic-gate /* 6287c478bd9Sstevel@tonic-gate * Set kpq under lock to prevent 6297c478bd9Sstevel@tonic-gate * migration between partitions. 6307c478bd9Sstevel@tonic-gate */ 6317c478bd9Sstevel@tonic-gate kpq = &cp->cpu_part->cp_kp_queue; 6327c478bd9Sstevel@tonic-gate if (kpq->disp_maxrunpri == -1) 6337c478bd9Sstevel@tonic-gate cp->cpu_chosen_level = -1; 6347c478bd9Sstevel@tonic-gate disp_lock_exit(&dp->disp_lock); 6357c478bd9Sstevel@tonic-gate } 6367c478bd9Sstevel@tonic-gate (*idle_cpu)(); 6377c478bd9Sstevel@tonic-gate continue; 6387c478bd9Sstevel@tonic-gate } 639685679f7Sakolb /* 640685679f7Sakolb * If there was a thread but we couldn't steal 641685679f7Sakolb * it, then keep trying. 642685679f7Sakolb */ 643685679f7Sakolb if (t == T_DONTSTEAL) 644685679f7Sakolb continue; 6457c478bd9Sstevel@tonic-gate idle_exit(); 6467c478bd9Sstevel@tonic-gate swtch_to(t); 6477c478bd9Sstevel@tonic-gate } 6487c478bd9Sstevel@tonic-gate idle_enter(); /* returned from swtch/swtch_to */ 6497c478bd9Sstevel@tonic-gate } 6507c478bd9Sstevel@tonic-gate } 6517c478bd9Sstevel@tonic-gate 6527c478bd9Sstevel@tonic-gate 6537c478bd9Sstevel@tonic-gate /* 6547c478bd9Sstevel@tonic-gate * Preempt the currently running thread in favor of the highest 6557c478bd9Sstevel@tonic-gate * priority thread. The class of the current thread controls 6567c478bd9Sstevel@tonic-gate * where it goes on the dispatcher queues. If panicking, turn 6577c478bd9Sstevel@tonic-gate * preemption off. 6587c478bd9Sstevel@tonic-gate */ 6597c478bd9Sstevel@tonic-gate void 6607c478bd9Sstevel@tonic-gate preempt() 6617c478bd9Sstevel@tonic-gate { 6627c478bd9Sstevel@tonic-gate kthread_t *t = curthread; 6637c478bd9Sstevel@tonic-gate klwp_t *lwp = ttolwp(curthread); 6647c478bd9Sstevel@tonic-gate 6657c478bd9Sstevel@tonic-gate if (panicstr) 6667c478bd9Sstevel@tonic-gate return; 6677c478bd9Sstevel@tonic-gate 6687c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_PREEMPT_START, "preempt_start"); 6697c478bd9Sstevel@tonic-gate 6707c478bd9Sstevel@tonic-gate thread_lock(t); 6717c478bd9Sstevel@tonic-gate 6727c478bd9Sstevel@tonic-gate if (t->t_state != TS_ONPROC || t->t_disp_queue != CPU->cpu_disp) { 6737c478bd9Sstevel@tonic-gate /* 6747c478bd9Sstevel@tonic-gate * this thread has already been chosen to be run on 6757c478bd9Sstevel@tonic-gate * another CPU. Clear kprunrun on this CPU since we're 6767c478bd9Sstevel@tonic-gate * already headed for swtch(). 6777c478bd9Sstevel@tonic-gate */ 6787c478bd9Sstevel@tonic-gate CPU->cpu_kprunrun = 0; 6797c478bd9Sstevel@tonic-gate thread_unlock_nopreempt(t); 6807c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_PREEMPT_END, "preempt_end"); 6817c478bd9Sstevel@tonic-gate } else { 6827c478bd9Sstevel@tonic-gate if (lwp != NULL) 6837c478bd9Sstevel@tonic-gate lwp->lwp_ru.nivcsw++; 6847c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, inv_swtch, 1); 6857c478bd9Sstevel@tonic-gate THREAD_TRANSITION(t); 6867c478bd9Sstevel@tonic-gate CL_PREEMPT(t); 6877c478bd9Sstevel@tonic-gate DTRACE_SCHED(preempt); 6887c478bd9Sstevel@tonic-gate thread_unlock_nopreempt(t); 6897c478bd9Sstevel@tonic-gate 6907c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_PREEMPT_END, "preempt_end"); 6917c478bd9Sstevel@tonic-gate 6927c478bd9Sstevel@tonic-gate swtch(); /* clears CPU->cpu_runrun via disp() */ 6937c478bd9Sstevel@tonic-gate } 6947c478bd9Sstevel@tonic-gate } 6957c478bd9Sstevel@tonic-gate 6967c478bd9Sstevel@tonic-gate extern kthread_t *thread_unpin(); 6977c478bd9Sstevel@tonic-gate 6987c478bd9Sstevel@tonic-gate /* 6997c478bd9Sstevel@tonic-gate * disp() - find the highest priority thread for this processor to run, and 7007c478bd9Sstevel@tonic-gate * set it in TS_ONPROC state so that resume() can be called to run it. 7017c478bd9Sstevel@tonic-gate */ 7027c478bd9Sstevel@tonic-gate static kthread_t * 7037c478bd9Sstevel@tonic-gate disp() 7047c478bd9Sstevel@tonic-gate { 7057c478bd9Sstevel@tonic-gate cpu_t *cpup; 7067c478bd9Sstevel@tonic-gate disp_t *dp; 7077c478bd9Sstevel@tonic-gate kthread_t *tp; 7087c478bd9Sstevel@tonic-gate dispq_t *dq; 7097c478bd9Sstevel@tonic-gate int maxrunword; 7107c478bd9Sstevel@tonic-gate pri_t pri; 7117c478bd9Sstevel@tonic-gate disp_t *kpq; 7127c478bd9Sstevel@tonic-gate 7137c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_DISP_START, "disp_start"); 7147c478bd9Sstevel@tonic-gate 7157c478bd9Sstevel@tonic-gate cpup = CPU; 7167c478bd9Sstevel@tonic-gate /* 7177c478bd9Sstevel@tonic-gate * Find the highest priority loaded, runnable thread. 7187c478bd9Sstevel@tonic-gate */ 7197c478bd9Sstevel@tonic-gate dp = cpup->cpu_disp; 7207c478bd9Sstevel@tonic-gate 7217c478bd9Sstevel@tonic-gate reschedule: 7227c478bd9Sstevel@tonic-gate /* 7237c478bd9Sstevel@tonic-gate * If there is more important work on the global queue with a better 7247c478bd9Sstevel@tonic-gate * priority than the maximum on this CPU, take it now. 7257c478bd9Sstevel@tonic-gate */ 7267c478bd9Sstevel@tonic-gate kpq = &cpup->cpu_part->cp_kp_queue; 7277c478bd9Sstevel@tonic-gate while ((pri = kpq->disp_maxrunpri) >= 0 && 7287c478bd9Sstevel@tonic-gate pri >= dp->disp_maxrunpri && 7297c478bd9Sstevel@tonic-gate (cpup->cpu_flags & CPU_OFFLINE) == 0 && 7307c478bd9Sstevel@tonic-gate (tp = disp_getbest(kpq)) != NULL) { 7317c478bd9Sstevel@tonic-gate if (disp_ratify(tp, kpq) != NULL) { 7327c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_DISP, TR_DISP_END, 7337c478bd9Sstevel@tonic-gate "disp_end:tid %p", tp); 7347c478bd9Sstevel@tonic-gate return (tp); 7357c478bd9Sstevel@tonic-gate } 7367c478bd9Sstevel@tonic-gate } 7377c478bd9Sstevel@tonic-gate 7387c478bd9Sstevel@tonic-gate disp_lock_enter(&dp->disp_lock); 7397c478bd9Sstevel@tonic-gate pri = dp->disp_maxrunpri; 7407c478bd9Sstevel@tonic-gate 7417c478bd9Sstevel@tonic-gate /* 7427c478bd9Sstevel@tonic-gate * If there is nothing to run, look at what's runnable on other queues. 7437c478bd9Sstevel@tonic-gate * Choose the idle thread if the CPU is quiesced. 7447c478bd9Sstevel@tonic-gate * Note that CPUs that have the CPU_OFFLINE flag set can still run 7457c478bd9Sstevel@tonic-gate * interrupt threads, which will be the only threads on the CPU's own 7467c478bd9Sstevel@tonic-gate * queue, but cannot run threads from other queues. 7477c478bd9Sstevel@tonic-gate */ 7487c478bd9Sstevel@tonic-gate if (pri == -1) { 7497c478bd9Sstevel@tonic-gate if (!(cpup->cpu_flags & CPU_OFFLINE)) { 7507c478bd9Sstevel@tonic-gate disp_lock_exit(&dp->disp_lock); 751685679f7Sakolb if ((tp = disp_getwork(cpup)) == NULL || 752685679f7Sakolb tp == T_DONTSTEAL) { 7537c478bd9Sstevel@tonic-gate tp = cpup->cpu_idle_thread; 7547c478bd9Sstevel@tonic-gate (void) splhigh(); 7557c478bd9Sstevel@tonic-gate THREAD_ONPROC(tp, cpup); 7567c478bd9Sstevel@tonic-gate cpup->cpu_dispthread = tp; 7577c478bd9Sstevel@tonic-gate cpup->cpu_dispatch_pri = -1; 7587c478bd9Sstevel@tonic-gate cpup->cpu_runrun = cpup->cpu_kprunrun = 0; 7597c478bd9Sstevel@tonic-gate cpup->cpu_chosen_level = -1; 7607c478bd9Sstevel@tonic-gate } 7617c478bd9Sstevel@tonic-gate } else { 7627c478bd9Sstevel@tonic-gate disp_lock_exit_high(&dp->disp_lock); 7637c478bd9Sstevel@tonic-gate tp = cpup->cpu_idle_thread; 7647c478bd9Sstevel@tonic-gate THREAD_ONPROC(tp, cpup); 7657c478bd9Sstevel@tonic-gate cpup->cpu_dispthread = tp; 7667c478bd9Sstevel@tonic-gate cpup->cpu_dispatch_pri = -1; 7677c478bd9Sstevel@tonic-gate cpup->cpu_runrun = cpup->cpu_kprunrun = 0; 7687c478bd9Sstevel@tonic-gate cpup->cpu_chosen_level = -1; 7697c478bd9Sstevel@tonic-gate } 7707c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_DISP, TR_DISP_END, 771d129bde2Sesaxe "disp_end:tid %p", tp); 7727c478bd9Sstevel@tonic-gate return (tp); 7737c478bd9Sstevel@tonic-gate } 7747c478bd9Sstevel@tonic-gate 7757c478bd9Sstevel@tonic-gate dq = &dp->disp_q[pri]; 7767c478bd9Sstevel@tonic-gate tp = dq->dq_first; 7777c478bd9Sstevel@tonic-gate 7787c478bd9Sstevel@tonic-gate ASSERT(tp != NULL); 7797c478bd9Sstevel@tonic-gate ASSERT(tp->t_schedflag & TS_LOAD); /* thread must be swapped in */ 7807c478bd9Sstevel@tonic-gate 7817c478bd9Sstevel@tonic-gate DTRACE_SCHED2(dequeue, kthread_t *, tp, disp_t *, dp); 7827c478bd9Sstevel@tonic-gate 7837c478bd9Sstevel@tonic-gate /* 7847c478bd9Sstevel@tonic-gate * Found it so remove it from queue. 7857c478bd9Sstevel@tonic-gate */ 7867c478bd9Sstevel@tonic-gate dp->disp_nrunnable--; 7877c478bd9Sstevel@tonic-gate dq->dq_sruncnt--; 7887c478bd9Sstevel@tonic-gate if ((dq->dq_first = tp->t_link) == NULL) { 7897c478bd9Sstevel@tonic-gate ulong_t *dqactmap = dp->disp_qactmap; 7907c478bd9Sstevel@tonic-gate 7917c478bd9Sstevel@tonic-gate ASSERT(dq->dq_sruncnt == 0); 7927c478bd9Sstevel@tonic-gate dq->dq_last = NULL; 7937c478bd9Sstevel@tonic-gate 7947c478bd9Sstevel@tonic-gate /* 7957c478bd9Sstevel@tonic-gate * The queue is empty, so the corresponding bit needs to be 7967c478bd9Sstevel@tonic-gate * turned off in dqactmap. If nrunnable != 0 just took the 7977c478bd9Sstevel@tonic-gate * last runnable thread off the 7987c478bd9Sstevel@tonic-gate * highest queue, so recompute disp_maxrunpri. 7997c478bd9Sstevel@tonic-gate */ 8007c478bd9Sstevel@tonic-gate maxrunword = pri >> BT_ULSHIFT; 8017c478bd9Sstevel@tonic-gate dqactmap[maxrunword] &= ~BT_BIW(pri); 8027c478bd9Sstevel@tonic-gate 8037c478bd9Sstevel@tonic-gate if (dp->disp_nrunnable == 0) { 8047c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = -1; 8057c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = -1; 8067c478bd9Sstevel@tonic-gate } else { 8077c478bd9Sstevel@tonic-gate int ipri; 8087c478bd9Sstevel@tonic-gate 8097c478bd9Sstevel@tonic-gate ipri = bt_gethighbit(dqactmap, maxrunword); 8107c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = ipri; 8117c478bd9Sstevel@tonic-gate if (ipri < dp->disp_max_unbound_pri) 8127c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = ipri; 8137c478bd9Sstevel@tonic-gate } 8147c478bd9Sstevel@tonic-gate } else { 8157c478bd9Sstevel@tonic-gate tp->t_link = NULL; 8167c478bd9Sstevel@tonic-gate } 8177c478bd9Sstevel@tonic-gate 8187c478bd9Sstevel@tonic-gate /* 8197c478bd9Sstevel@tonic-gate * Set TS_DONT_SWAP flag to prevent another processor from swapping 8207c478bd9Sstevel@tonic-gate * out this thread before we have a chance to run it. 8217c478bd9Sstevel@tonic-gate * While running, it is protected against swapping by t_lock. 8227c478bd9Sstevel@tonic-gate */ 8237c478bd9Sstevel@tonic-gate tp->t_schedflag |= TS_DONT_SWAP; 8247c478bd9Sstevel@tonic-gate cpup->cpu_dispthread = tp; /* protected by spl only */ 8257c478bd9Sstevel@tonic-gate cpup->cpu_dispatch_pri = pri; 8267c478bd9Sstevel@tonic-gate ASSERT(pri == DISP_PRIO(tp)); 8277c478bd9Sstevel@tonic-gate thread_onproc(tp, cpup); /* set t_state to TS_ONPROC */ 8287c478bd9Sstevel@tonic-gate disp_lock_exit_high(&dp->disp_lock); /* drop run queue lock */ 8297c478bd9Sstevel@tonic-gate 8307c478bd9Sstevel@tonic-gate ASSERT(tp != NULL); 8317c478bd9Sstevel@tonic-gate TRACE_1(TR_FAC_DISP, TR_DISP_END, 832d129bde2Sesaxe "disp_end:tid %p", tp); 8337c478bd9Sstevel@tonic-gate 8347c478bd9Sstevel@tonic-gate if (disp_ratify(tp, kpq) == NULL) 8357c478bd9Sstevel@tonic-gate goto reschedule; 8367c478bd9Sstevel@tonic-gate 8377c478bd9Sstevel@tonic-gate return (tp); 8387c478bd9Sstevel@tonic-gate } 8397c478bd9Sstevel@tonic-gate 8407c478bd9Sstevel@tonic-gate /* 8417c478bd9Sstevel@tonic-gate * swtch() 8427c478bd9Sstevel@tonic-gate * Find best runnable thread and run it. 8437c478bd9Sstevel@tonic-gate * Called with the current thread already switched to a new state, 8447c478bd9Sstevel@tonic-gate * on a sleep queue, run queue, stopped, and not zombied. 8457c478bd9Sstevel@tonic-gate * May be called at any spl level less than or equal to LOCK_LEVEL. 8467c478bd9Sstevel@tonic-gate * Always drops spl to the base level (spl0()). 8477c478bd9Sstevel@tonic-gate */ 8487c478bd9Sstevel@tonic-gate void 8497c478bd9Sstevel@tonic-gate swtch() 8507c478bd9Sstevel@tonic-gate { 8517c478bd9Sstevel@tonic-gate kthread_t *t = curthread; 8527c478bd9Sstevel@tonic-gate kthread_t *next; 8537c478bd9Sstevel@tonic-gate cpu_t *cp; 8547c478bd9Sstevel@tonic-gate 8557c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_SWTCH_START, "swtch_start"); 8567c478bd9Sstevel@tonic-gate 8577c478bd9Sstevel@tonic-gate if (t->t_flag & T_INTR_THREAD) 8587c478bd9Sstevel@tonic-gate cpu_intr_swtch_enter(t); 8597c478bd9Sstevel@tonic-gate 8607c478bd9Sstevel@tonic-gate if (t->t_intr != NULL) { 8617c478bd9Sstevel@tonic-gate /* 8627c478bd9Sstevel@tonic-gate * We are an interrupt thread. Setup and return 8637c478bd9Sstevel@tonic-gate * the interrupted thread to be resumed. 8647c478bd9Sstevel@tonic-gate */ 8657c478bd9Sstevel@tonic-gate (void) splhigh(); /* block other scheduler action */ 8667c478bd9Sstevel@tonic-gate cp = CPU; /* now protected against migration */ 8677c478bd9Sstevel@tonic-gate ASSERT(CPU_ON_INTR(cp) == 0); /* not called with PIL > 10 */ 8687c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cp, sys, pswitch, 1); 8697c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cp, sys, intrblk, 1); 8707c478bd9Sstevel@tonic-gate next = thread_unpin(); 8717c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_RESUME_START, "resume_start"); 8727c478bd9Sstevel@tonic-gate resume_from_intr(next); 8737c478bd9Sstevel@tonic-gate } else { 8747c478bd9Sstevel@tonic-gate #ifdef DEBUG 8757c478bd9Sstevel@tonic-gate if (t->t_state == TS_ONPROC && 8767c478bd9Sstevel@tonic-gate t->t_disp_queue->disp_cpu == CPU && 8777c478bd9Sstevel@tonic-gate t->t_preempt == 0) { 8787c478bd9Sstevel@tonic-gate thread_lock(t); 8797c478bd9Sstevel@tonic-gate ASSERT(t->t_state != TS_ONPROC || 8807c478bd9Sstevel@tonic-gate t->t_disp_queue->disp_cpu != CPU || 8817c478bd9Sstevel@tonic-gate t->t_preempt != 0); /* cannot migrate */ 8827c478bd9Sstevel@tonic-gate thread_unlock_nopreempt(t); 8837c478bd9Sstevel@tonic-gate } 8847c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 8857c478bd9Sstevel@tonic-gate cp = CPU; 8867c478bd9Sstevel@tonic-gate next = disp(); /* returns with spl high */ 8877c478bd9Sstevel@tonic-gate ASSERT(CPU_ON_INTR(cp) == 0); /* not called with PIL > 10 */ 8887c478bd9Sstevel@tonic-gate 8897c478bd9Sstevel@tonic-gate /* OK to steal anything left on run queue */ 8907c478bd9Sstevel@tonic-gate cp->cpu_disp_flags &= ~CPU_DISP_DONTSTEAL; 8917c478bd9Sstevel@tonic-gate 8927c478bd9Sstevel@tonic-gate if (next != t) { 893*0e751525SEric Saxe hrtime_t now; 894*0e751525SEric Saxe 895*0e751525SEric Saxe now = gethrtime_unscaled(); 896*0e751525SEric Saxe pg_ev_thread_swtch(cp, now, t, next); 8977c478bd9Sstevel@tonic-gate 898f2bd4627Sjohansen /* 899f2bd4627Sjohansen * If t was previously in the TS_ONPROC state, 900f2bd4627Sjohansen * setfrontdq and setbackdq won't have set its t_waitrq. 901f2bd4627Sjohansen * Since we now finally know that we're switching away 902f2bd4627Sjohansen * from this thread, set its t_waitrq if it is on a run 903f2bd4627Sjohansen * queue. 904f2bd4627Sjohansen */ 905f2bd4627Sjohansen if ((t->t_state == TS_RUN) && (t->t_waitrq == 0)) { 906*0e751525SEric Saxe t->t_waitrq = now; 907f2bd4627Sjohansen } 908f2bd4627Sjohansen 909f2bd4627Sjohansen /* 910f2bd4627Sjohansen * restore mstate of thread that we are switching to 911f2bd4627Sjohansen */ 912f2bd4627Sjohansen restore_mstate(next); 913f2bd4627Sjohansen 9147c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cp, sys, pswitch, 1); 9157c478bd9Sstevel@tonic-gate cp->cpu_last_swtch = t->t_disp_time = lbolt; 9167c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_RESUME_START, "resume_start"); 9177c478bd9Sstevel@tonic-gate 9187c478bd9Sstevel@tonic-gate if (dtrace_vtime_active) 9197c478bd9Sstevel@tonic-gate dtrace_vtime_switch(next); 9207c478bd9Sstevel@tonic-gate 9217c478bd9Sstevel@tonic-gate resume(next); 9227c478bd9Sstevel@tonic-gate /* 9237c478bd9Sstevel@tonic-gate * The TR_RESUME_END and TR_SWTCH_END trace points 9247c478bd9Sstevel@tonic-gate * appear at the end of resume(), because we may not 9257c478bd9Sstevel@tonic-gate * return here 9267c478bd9Sstevel@tonic-gate */ 9277c478bd9Sstevel@tonic-gate } else { 9287c478bd9Sstevel@tonic-gate if (t->t_flag & T_INTR_THREAD) 9297c478bd9Sstevel@tonic-gate cpu_intr_swtch_exit(t); 9307c478bd9Sstevel@tonic-gate 931*0e751525SEric Saxe pg_ev_thread_remain(cp, t); 932*0e751525SEric Saxe 9337c478bd9Sstevel@tonic-gate DTRACE_SCHED(remain__cpu); 9347c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_SWTCH_END, "swtch_end"); 9357c478bd9Sstevel@tonic-gate (void) spl0(); 9367c478bd9Sstevel@tonic-gate } 9377c478bd9Sstevel@tonic-gate } 9387c478bd9Sstevel@tonic-gate } 9397c478bd9Sstevel@tonic-gate 9407c478bd9Sstevel@tonic-gate /* 9417c478bd9Sstevel@tonic-gate * swtch_from_zombie() 9427c478bd9Sstevel@tonic-gate * Special case of swtch(), which allows checks for TS_ZOMB to be 9437c478bd9Sstevel@tonic-gate * eliminated from normal resume. 9447c478bd9Sstevel@tonic-gate * Find best runnable thread and run it. 9457c478bd9Sstevel@tonic-gate * Called with the current thread zombied. 9467c478bd9Sstevel@tonic-gate * Zombies cannot migrate, so CPU references are safe. 9477c478bd9Sstevel@tonic-gate */ 9487c478bd9Sstevel@tonic-gate void 9497c478bd9Sstevel@tonic-gate swtch_from_zombie() 9507c478bd9Sstevel@tonic-gate { 9517c478bd9Sstevel@tonic-gate kthread_t *next; 9527c478bd9Sstevel@tonic-gate cpu_t *cpu = CPU; 9537c478bd9Sstevel@tonic-gate 9547c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_SWTCH_START, "swtch_start"); 9557c478bd9Sstevel@tonic-gate 9567c478bd9Sstevel@tonic-gate ASSERT(curthread->t_state == TS_ZOMB); 9577c478bd9Sstevel@tonic-gate 9587c478bd9Sstevel@tonic-gate next = disp(); /* returns with spl high */ 9597c478bd9Sstevel@tonic-gate ASSERT(CPU_ON_INTR(CPU) == 0); /* not called with PIL > 10 */ 9607c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(CPU, sys, pswitch, 1); 9617c478bd9Sstevel@tonic-gate ASSERT(next != curthread); 9627c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_RESUME_START, "resume_start"); 9637c478bd9Sstevel@tonic-gate 964*0e751525SEric Saxe pg_ev_thread_swtch(cpu, gethrtime_unscaled(), curthread, next); 9657c478bd9Sstevel@tonic-gate 966f2bd4627Sjohansen restore_mstate(next); 967f2bd4627Sjohansen 9687c478bd9Sstevel@tonic-gate if (dtrace_vtime_active) 9697c478bd9Sstevel@tonic-gate dtrace_vtime_switch(next); 9707c478bd9Sstevel@tonic-gate 9717c478bd9Sstevel@tonic-gate resume_from_zombie(next); 9727c478bd9Sstevel@tonic-gate /* 9737c478bd9Sstevel@tonic-gate * The TR_RESUME_END and TR_SWTCH_END trace points 9747c478bd9Sstevel@tonic-gate * appear at the end of resume(), because we certainly will not 9757c478bd9Sstevel@tonic-gate * return here 9767c478bd9Sstevel@tonic-gate */ 9777c478bd9Sstevel@tonic-gate } 9787c478bd9Sstevel@tonic-gate 9797c478bd9Sstevel@tonic-gate #if defined(DEBUG) && (defined(DISP_DEBUG) || defined(lint)) 980057452c6Sjj 981057452c6Sjj /* 982057452c6Sjj * search_disp_queues() 983057452c6Sjj * Search the given dispatch queues for thread tp. 984057452c6Sjj * Return 1 if tp is found, otherwise return 0. 985057452c6Sjj */ 9867c478bd9Sstevel@tonic-gate static int 987057452c6Sjj search_disp_queues(disp_t *dp, kthread_t *tp) 9887c478bd9Sstevel@tonic-gate { 989057452c6Sjj dispq_t *dq; 990057452c6Sjj dispq_t *eq; 9917c478bd9Sstevel@tonic-gate 992057452c6Sjj disp_lock_enter_high(&dp->disp_lock); 993057452c6Sjj 994057452c6Sjj for (dq = dp->disp_q, eq = dp->disp_q_limit; dq < eq; ++dq) { 995057452c6Sjj kthread_t *rp; 996057452c6Sjj 997057452c6Sjj ASSERT(dq->dq_last == NULL || dq->dq_last->t_link == NULL); 998057452c6Sjj 999057452c6Sjj for (rp = dq->dq_first; rp; rp = rp->t_link) 1000057452c6Sjj if (tp == rp) { 1001057452c6Sjj disp_lock_exit_high(&dp->disp_lock); 1002057452c6Sjj return (1); 1003057452c6Sjj } 10047c478bd9Sstevel@tonic-gate } 1005057452c6Sjj disp_lock_exit_high(&dp->disp_lock); 1006057452c6Sjj 1007057452c6Sjj return (0); 1008057452c6Sjj } 1009057452c6Sjj 1010057452c6Sjj /* 1011057452c6Sjj * thread_on_queue() 1012057452c6Sjj * Search all per-CPU dispatch queues and all partition-wide kpreempt 1013057452c6Sjj * queues for thread tp. Return 1 if tp is found, otherwise return 0. 1014057452c6Sjj */ 1015057452c6Sjj static int 1016057452c6Sjj thread_on_queue(kthread_t *tp) 1017057452c6Sjj { 1018057452c6Sjj cpu_t *cp; 1019057452c6Sjj struct cpupart *part; 1020057452c6Sjj 1021057452c6Sjj ASSERT(getpil() >= DISP_LEVEL); 1022057452c6Sjj 1023057452c6Sjj /* 1024057452c6Sjj * Search the per-CPU dispatch queues for tp. 1025057452c6Sjj */ 1026057452c6Sjj cp = CPU; 1027057452c6Sjj do { 1028057452c6Sjj if (search_disp_queues(cp->cpu_disp, tp)) 1029057452c6Sjj return (1); 1030057452c6Sjj } while ((cp = cp->cpu_next_onln) != CPU); 1031057452c6Sjj 1032057452c6Sjj /* 1033057452c6Sjj * Search the partition-wide kpreempt queues for tp. 1034057452c6Sjj */ 1035057452c6Sjj part = CPU->cpu_part; 1036057452c6Sjj do { 1037057452c6Sjj if (search_disp_queues(&part->cp_kp_queue, tp)) 1038057452c6Sjj return (1); 1039057452c6Sjj } while ((part = part->cp_next) != CPU->cpu_part); 1040057452c6Sjj 10417c478bd9Sstevel@tonic-gate return (0); 1042057452c6Sjj } 1043057452c6Sjj 10447c478bd9Sstevel@tonic-gate #else 10457c478bd9Sstevel@tonic-gate 10467c478bd9Sstevel@tonic-gate #define thread_on_queue(tp) 0 /* ASSERT must be !thread_on_queue */ 10477c478bd9Sstevel@tonic-gate 10487c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 10497c478bd9Sstevel@tonic-gate 10507c478bd9Sstevel@tonic-gate /* 10517c478bd9Sstevel@tonic-gate * like swtch(), but switch to a specified thread taken from another CPU. 10527c478bd9Sstevel@tonic-gate * called with spl high.. 10537c478bd9Sstevel@tonic-gate */ 10547c478bd9Sstevel@tonic-gate void 10557c478bd9Sstevel@tonic-gate swtch_to(kthread_t *next) 10567c478bd9Sstevel@tonic-gate { 10577c478bd9Sstevel@tonic-gate cpu_t *cp = CPU; 1058*0e751525SEric Saxe hrtime_t now; 10597c478bd9Sstevel@tonic-gate 10607c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_SWTCH_START, "swtch_start"); 10617c478bd9Sstevel@tonic-gate 10627c478bd9Sstevel@tonic-gate /* 10637c478bd9Sstevel@tonic-gate * Update context switch statistics. 10647c478bd9Sstevel@tonic-gate */ 10657c478bd9Sstevel@tonic-gate CPU_STATS_ADDQ(cp, sys, pswitch, 1); 10667c478bd9Sstevel@tonic-gate 10677c478bd9Sstevel@tonic-gate TRACE_0(TR_FAC_DISP, TR_RESUME_START, "resume_start"); 10687c478bd9Sstevel@tonic-gate 1069*0e751525SEric Saxe now = gethrtime_unscaled(); 1070*0e751525SEric Saxe pg_ev_thread_swtch(cp, now, curthread, next); 10717c478bd9Sstevel@tonic-gate 10727c478bd9Sstevel@tonic-gate /* OK to steal anything left on run queue */ 10737c478bd9Sstevel@tonic-gate cp->cpu_disp_flags &= ~CPU_DISP_DONTSTEAL; 10747c478bd9Sstevel@tonic-gate 10757c478bd9Sstevel@tonic-gate /* record last execution time */ 10767c478bd9Sstevel@tonic-gate cp->cpu_last_swtch = curthread->t_disp_time = lbolt; 10777c478bd9Sstevel@tonic-gate 1078f2bd4627Sjohansen /* 1079f2bd4627Sjohansen * If t was previously in the TS_ONPROC state, setfrontdq and setbackdq 1080f2bd4627Sjohansen * won't have set its t_waitrq. Since we now finally know that we're 1081f2bd4627Sjohansen * switching away from this thread, set its t_waitrq if it is on a run 1082f2bd4627Sjohansen * queue. 1083f2bd4627Sjohansen */ 1084f2bd4627Sjohansen if ((curthread->t_state == TS_RUN) && (curthread->t_waitrq == 0)) { 1085*0e751525SEric Saxe curthread->t_waitrq = now; 1086f2bd4627Sjohansen } 1087f2bd4627Sjohansen 1088f2bd4627Sjohansen /* restore next thread to previously running microstate */ 1089f2bd4627Sjohansen restore_mstate(next); 1090f2bd4627Sjohansen 10917c478bd9Sstevel@tonic-gate if (dtrace_vtime_active) 10927c478bd9Sstevel@tonic-gate dtrace_vtime_switch(next); 10937c478bd9Sstevel@tonic-gate 10947c478bd9Sstevel@tonic-gate resume(next); 10957c478bd9Sstevel@tonic-gate /* 10967c478bd9Sstevel@tonic-gate * The TR_RESUME_END and TR_SWTCH_END trace points 10977c478bd9Sstevel@tonic-gate * appear at the end of resume(), because we may not 10987c478bd9Sstevel@tonic-gate * return here 10997c478bd9Sstevel@tonic-gate */ 11007c478bd9Sstevel@tonic-gate } 11017c478bd9Sstevel@tonic-gate 11027c478bd9Sstevel@tonic-gate #define CPU_IDLING(pri) ((pri) == -1) 11037c478bd9Sstevel@tonic-gate 11047c478bd9Sstevel@tonic-gate static void 11057c478bd9Sstevel@tonic-gate cpu_resched(cpu_t *cp, pri_t tpri) 11067c478bd9Sstevel@tonic-gate { 11077c478bd9Sstevel@tonic-gate int call_poke_cpu = 0; 11087c478bd9Sstevel@tonic-gate pri_t cpupri = cp->cpu_dispatch_pri; 11097c478bd9Sstevel@tonic-gate 11107c478bd9Sstevel@tonic-gate if (!CPU_IDLING(cpupri) && (cpupri < tpri)) { 11117c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_DISP, TR_CPU_RESCHED, 11127c478bd9Sstevel@tonic-gate "CPU_RESCHED:Tpri %d Cpupri %d", tpri, cpupri); 11137c478bd9Sstevel@tonic-gate if (tpri >= upreemptpri && cp->cpu_runrun == 0) { 11147c478bd9Sstevel@tonic-gate cp->cpu_runrun = 1; 11157c478bd9Sstevel@tonic-gate aston(cp->cpu_dispthread); 11167c478bd9Sstevel@tonic-gate if (tpri < kpreemptpri && cp != CPU) 11177c478bd9Sstevel@tonic-gate call_poke_cpu = 1; 11187c478bd9Sstevel@tonic-gate } 11197c478bd9Sstevel@tonic-gate if (tpri >= kpreemptpri && cp->cpu_kprunrun == 0) { 11207c478bd9Sstevel@tonic-gate cp->cpu_kprunrun = 1; 11217c478bd9Sstevel@tonic-gate if (cp != CPU) 11227c478bd9Sstevel@tonic-gate call_poke_cpu = 1; 11237c478bd9Sstevel@tonic-gate } 11247c478bd9Sstevel@tonic-gate } 11257c478bd9Sstevel@tonic-gate 11267c478bd9Sstevel@tonic-gate /* 11277c478bd9Sstevel@tonic-gate * Propagate cpu_runrun, and cpu_kprunrun to global visibility. 11287c478bd9Sstevel@tonic-gate */ 11297c478bd9Sstevel@tonic-gate membar_enter(); 11307c478bd9Sstevel@tonic-gate 11317c478bd9Sstevel@tonic-gate if (call_poke_cpu) 11327c478bd9Sstevel@tonic-gate poke_cpu(cp->cpu_id); 11337c478bd9Sstevel@tonic-gate } 11347c478bd9Sstevel@tonic-gate 11357c478bd9Sstevel@tonic-gate /* 11367c478bd9Sstevel@tonic-gate * setbackdq() keeps runqs balanced such that the difference in length 11377c478bd9Sstevel@tonic-gate * between the chosen runq and the next one is no more than RUNQ_MAX_DIFF. 11387c478bd9Sstevel@tonic-gate * For threads with priorities below RUNQ_MATCH_PRI levels, the runq's lengths 11397c478bd9Sstevel@tonic-gate * must match. When per-thread TS_RUNQMATCH flag is set, setbackdq() will 11407c478bd9Sstevel@tonic-gate * try to keep runqs perfectly balanced regardless of the thread priority. 11417c478bd9Sstevel@tonic-gate */ 11427c478bd9Sstevel@tonic-gate #define RUNQ_MATCH_PRI 16 /* pri below which queue lengths must match */ 11437c478bd9Sstevel@tonic-gate #define RUNQ_MAX_DIFF 2 /* maximum runq length difference */ 11447c478bd9Sstevel@tonic-gate #define RUNQ_LEN(cp, pri) ((cp)->cpu_disp->disp_q[pri].dq_sruncnt) 11457c478bd9Sstevel@tonic-gate 11466890d023SEric Saxe /* 11476890d023SEric Saxe * Macro that evaluates to true if it is likely that the thread has cache 11486890d023SEric Saxe * warmth. This is based on the amount of time that has elapsed since the 11496890d023SEric Saxe * thread last ran. If that amount of time is less than "rechoose_interval" 11506890d023SEric Saxe * ticks, then we decide that the thread has enough cache warmth to warrant 11516890d023SEric Saxe * some affinity for t->t_cpu. 11526890d023SEric Saxe */ 11536890d023SEric Saxe #define THREAD_HAS_CACHE_WARMTH(thread) \ 11546890d023SEric Saxe ((thread == curthread) || \ 11556890d023SEric Saxe ((lbolt - thread->t_disp_time) <= rechoose_interval)) 11567c478bd9Sstevel@tonic-gate /* 11577c478bd9Sstevel@tonic-gate * Put the specified thread on the back of the dispatcher 11587c478bd9Sstevel@tonic-gate * queue corresponding to its current priority. 11597c478bd9Sstevel@tonic-gate * 11607c478bd9Sstevel@tonic-gate * Called with the thread in transition, onproc or stopped state 11617c478bd9Sstevel@tonic-gate * and locked (transition implies locked) and at high spl. 11627c478bd9Sstevel@tonic-gate * Returns with the thread in TS_RUN state and still locked. 11637c478bd9Sstevel@tonic-gate */ 11647c478bd9Sstevel@tonic-gate void 11657c478bd9Sstevel@tonic-gate setbackdq(kthread_t *tp) 11667c478bd9Sstevel@tonic-gate { 11677c478bd9Sstevel@tonic-gate dispq_t *dq; 11687c478bd9Sstevel@tonic-gate disp_t *dp; 11697c478bd9Sstevel@tonic-gate cpu_t *cp; 11707c478bd9Sstevel@tonic-gate pri_t tpri; 11717c478bd9Sstevel@tonic-gate int bound; 11726890d023SEric Saxe boolean_t self; 11737c478bd9Sstevel@tonic-gate 11747c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 11757c478bd9Sstevel@tonic-gate ASSERT((tp->t_schedflag & TS_ALLSTART) == 0); 11767c478bd9Sstevel@tonic-gate ASSERT(!thread_on_queue(tp)); /* make sure tp isn't on a runq */ 11777c478bd9Sstevel@tonic-gate 11787c478bd9Sstevel@tonic-gate /* 11797c478bd9Sstevel@tonic-gate * If thread is "swapped" or on the swap queue don't 11807c478bd9Sstevel@tonic-gate * queue it, but wake sched. 11817c478bd9Sstevel@tonic-gate */ 11827c478bd9Sstevel@tonic-gate if ((tp->t_schedflag & (TS_LOAD | TS_ON_SWAPQ)) != TS_LOAD) { 11837c478bd9Sstevel@tonic-gate disp_swapped_setrun(tp); 11847c478bd9Sstevel@tonic-gate return; 11857c478bd9Sstevel@tonic-gate } 11867c478bd9Sstevel@tonic-gate 11876890d023SEric Saxe self = (tp == curthread); 11886890d023SEric Saxe 1189abd41583Sgd if (tp->t_bound_cpu || tp->t_weakbound_cpu) 1190abd41583Sgd bound = 1; 1191abd41583Sgd else 1192abd41583Sgd bound = 0; 1193abd41583Sgd 11947c478bd9Sstevel@tonic-gate tpri = DISP_PRIO(tp); 11957c478bd9Sstevel@tonic-gate if (ncpus == 1) 11967c478bd9Sstevel@tonic-gate cp = tp->t_cpu; 1197abd41583Sgd else if (!bound) { 11987c478bd9Sstevel@tonic-gate if (tpri >= kpqpri) { 11997c478bd9Sstevel@tonic-gate setkpdq(tp, SETKP_BACK); 12007c478bd9Sstevel@tonic-gate return; 12017c478bd9Sstevel@tonic-gate } 12026890d023SEric Saxe 12037c478bd9Sstevel@tonic-gate /* 12046890d023SEric Saxe * We'll generally let this thread continue to run where 12056890d023SEric Saxe * it last ran...but will consider migration if: 12066890d023SEric Saxe * - We thread probably doesn't have much cache warmth. 12076890d023SEric Saxe * - The CPU where it last ran is the target of an offline 12086890d023SEric Saxe * request. 12096890d023SEric Saxe * - The thread last ran outside it's home lgroup. 12107c478bd9Sstevel@tonic-gate */ 12116890d023SEric Saxe if ((!THREAD_HAS_CACHE_WARMTH(tp)) || 12126890d023SEric Saxe (tp->t_cpu == cpu_inmotion)) { 12136890d023SEric Saxe cp = disp_lowpri_cpu(tp->t_cpu, tp->t_lpl, tpri, NULL); 12146890d023SEric Saxe } else if (!LGRP_CONTAINS_CPU(tp->t_lpl->lpl_lgrp, tp->t_cpu)) { 12156890d023SEric Saxe cp = disp_lowpri_cpu(tp->t_cpu, tp->t_lpl, tpri, 12166890d023SEric Saxe self ? tp->t_cpu : NULL); 12176890d023SEric Saxe } else { 12186890d023SEric Saxe cp = tp->t_cpu; 12196890d023SEric Saxe } 12207c478bd9Sstevel@tonic-gate 12217c478bd9Sstevel@tonic-gate if (tp->t_cpupart == cp->cpu_part) { 12227c478bd9Sstevel@tonic-gate int qlen; 12237c478bd9Sstevel@tonic-gate 12247c478bd9Sstevel@tonic-gate /* 1225fb2f18f8Sesaxe * Perform any CMT load balancing 12267c478bd9Sstevel@tonic-gate */ 1227fb2f18f8Sesaxe cp = cmt_balance(tp, cp); 12287c478bd9Sstevel@tonic-gate 12297c478bd9Sstevel@tonic-gate /* 12307c478bd9Sstevel@tonic-gate * Balance across the run queues 12317c478bd9Sstevel@tonic-gate */ 12327c478bd9Sstevel@tonic-gate qlen = RUNQ_LEN(cp, tpri); 12337c478bd9Sstevel@tonic-gate if (tpri >= RUNQ_MATCH_PRI && 12347c478bd9Sstevel@tonic-gate !(tp->t_schedflag & TS_RUNQMATCH)) 12357c478bd9Sstevel@tonic-gate qlen -= RUNQ_MAX_DIFF; 12367c478bd9Sstevel@tonic-gate if (qlen > 0) { 1237685679f7Sakolb cpu_t *newcp; 12387c478bd9Sstevel@tonic-gate 1239685679f7Sakolb if (tp->t_lpl->lpl_lgrpid == LGRP_ROOTID) { 1240685679f7Sakolb newcp = cp->cpu_next_part; 1241685679f7Sakolb } else if ((newcp = cp->cpu_next_lpl) == cp) { 1242685679f7Sakolb newcp = cp->cpu_next_part; 1243685679f7Sakolb } 1244685679f7Sakolb 1245685679f7Sakolb if (RUNQ_LEN(newcp, tpri) < qlen) { 1246685679f7Sakolb DTRACE_PROBE3(runq__balance, 1247685679f7Sakolb kthread_t *, tp, 1248685679f7Sakolb cpu_t *, cp, cpu_t *, newcp); 1249685679f7Sakolb cp = newcp; 12507c478bd9Sstevel@tonic-gate } 12517c478bd9Sstevel@tonic-gate } 12527c478bd9Sstevel@tonic-gate } else { 12537c478bd9Sstevel@tonic-gate /* 12547c478bd9Sstevel@tonic-gate * Migrate to a cpu in the new partition. 12557c478bd9Sstevel@tonic-gate */ 12567c478bd9Sstevel@tonic-gate cp = disp_lowpri_cpu(tp->t_cpupart->cp_cpulist, 12577c478bd9Sstevel@tonic-gate tp->t_lpl, tp->t_pri, NULL); 12587c478bd9Sstevel@tonic-gate } 12597c478bd9Sstevel@tonic-gate ASSERT((cp->cpu_flags & CPU_QUIESCED) == 0); 12607c478bd9Sstevel@tonic-gate } else { 12617c478bd9Sstevel@tonic-gate /* 12627c478bd9Sstevel@tonic-gate * It is possible that t_weakbound_cpu != t_bound_cpu (for 12637c478bd9Sstevel@tonic-gate * a short time until weak binding that existed when the 12647c478bd9Sstevel@tonic-gate * strong binding was established has dropped) so we must 12657c478bd9Sstevel@tonic-gate * favour weak binding over strong. 12667c478bd9Sstevel@tonic-gate */ 12677c478bd9Sstevel@tonic-gate cp = tp->t_weakbound_cpu ? 12687c478bd9Sstevel@tonic-gate tp->t_weakbound_cpu : tp->t_bound_cpu; 12697c478bd9Sstevel@tonic-gate } 1270f2bd4627Sjohansen /* 1271f2bd4627Sjohansen * A thread that is ONPROC may be temporarily placed on the run queue 1272f2bd4627Sjohansen * but then chosen to run again by disp. If the thread we're placing on 1273f2bd4627Sjohansen * the queue is in TS_ONPROC state, don't set its t_waitrq until a 1274f2bd4627Sjohansen * replacement process is actually scheduled in swtch(). In this 1275f2bd4627Sjohansen * situation, curthread is the only thread that could be in the ONPROC 1276f2bd4627Sjohansen * state. 1277f2bd4627Sjohansen */ 12786890d023SEric Saxe if ((!self) && (tp->t_waitrq == 0)) { 1279f2bd4627Sjohansen hrtime_t curtime; 1280f2bd4627Sjohansen 1281f2bd4627Sjohansen curtime = gethrtime_unscaled(); 1282f2bd4627Sjohansen (void) cpu_update_pct(tp, curtime); 1283f2bd4627Sjohansen tp->t_waitrq = curtime; 1284f2bd4627Sjohansen } else { 1285f2bd4627Sjohansen (void) cpu_update_pct(tp, gethrtime_unscaled()); 1286f2bd4627Sjohansen } 1287f2bd4627Sjohansen 12887c478bd9Sstevel@tonic-gate dp = cp->cpu_disp; 12897c478bd9Sstevel@tonic-gate disp_lock_enter_high(&dp->disp_lock); 12907c478bd9Sstevel@tonic-gate 12917c478bd9Sstevel@tonic-gate DTRACE_SCHED3(enqueue, kthread_t *, tp, disp_t *, dp, int, 0); 12927c478bd9Sstevel@tonic-gate TRACE_3(TR_FAC_DISP, TR_BACKQ, "setbackdq:pri %d cpu %p tid %p", 1293d129bde2Sesaxe tpri, cp, tp); 12947c478bd9Sstevel@tonic-gate 12957c478bd9Sstevel@tonic-gate #ifndef NPROBE 12967c478bd9Sstevel@tonic-gate /* Kernel probe */ 12977c478bd9Sstevel@tonic-gate if (tnf_tracing_active) 12987c478bd9Sstevel@tonic-gate tnf_thread_queue(tp, cp, tpri); 12997c478bd9Sstevel@tonic-gate #endif /* NPROBE */ 13007c478bd9Sstevel@tonic-gate 13017c478bd9Sstevel@tonic-gate ASSERT(tpri >= 0 && tpri < dp->disp_npri); 13027c478bd9Sstevel@tonic-gate 13037c478bd9Sstevel@tonic-gate THREAD_RUN(tp, &dp->disp_lock); /* set t_state to TS_RUN */ 13047c478bd9Sstevel@tonic-gate tp->t_disp_queue = dp; 13057c478bd9Sstevel@tonic-gate tp->t_link = NULL; 13067c478bd9Sstevel@tonic-gate 13077c478bd9Sstevel@tonic-gate dq = &dp->disp_q[tpri]; 13087c478bd9Sstevel@tonic-gate dp->disp_nrunnable++; 1309685679f7Sakolb if (!bound) 1310685679f7Sakolb dp->disp_steal = 0; 13117c478bd9Sstevel@tonic-gate membar_enter(); 13127c478bd9Sstevel@tonic-gate 13137c478bd9Sstevel@tonic-gate if (dq->dq_sruncnt++ != 0) { 13147c478bd9Sstevel@tonic-gate ASSERT(dq->dq_first != NULL); 13157c478bd9Sstevel@tonic-gate dq->dq_last->t_link = tp; 13167c478bd9Sstevel@tonic-gate dq->dq_last = tp; 13177c478bd9Sstevel@tonic-gate } else { 13187c478bd9Sstevel@tonic-gate ASSERT(dq->dq_first == NULL); 13197c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last == NULL); 13207c478bd9Sstevel@tonic-gate dq->dq_first = dq->dq_last = tp; 13217c478bd9Sstevel@tonic-gate BT_SET(dp->disp_qactmap, tpri); 13227c478bd9Sstevel@tonic-gate if (tpri > dp->disp_maxrunpri) { 13237c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = tpri; 13247c478bd9Sstevel@tonic-gate membar_enter(); 13257c478bd9Sstevel@tonic-gate cpu_resched(cp, tpri); 13267c478bd9Sstevel@tonic-gate } 13277c478bd9Sstevel@tonic-gate } 13287c478bd9Sstevel@tonic-gate 13297c478bd9Sstevel@tonic-gate if (!bound && tpri > dp->disp_max_unbound_pri) { 13306890d023SEric Saxe if (self && dp->disp_max_unbound_pri == -1 && cp == CPU) { 13317c478bd9Sstevel@tonic-gate /* 13327c478bd9Sstevel@tonic-gate * If there are no other unbound threads on the 13337c478bd9Sstevel@tonic-gate * run queue, don't allow other CPUs to steal 13347c478bd9Sstevel@tonic-gate * this thread while we are in the middle of a 13357c478bd9Sstevel@tonic-gate * context switch. We may just switch to it 13367c478bd9Sstevel@tonic-gate * again right away. CPU_DISP_DONTSTEAL is cleared 13377c478bd9Sstevel@tonic-gate * in swtch and swtch_to. 13387c478bd9Sstevel@tonic-gate */ 13397c478bd9Sstevel@tonic-gate cp->cpu_disp_flags |= CPU_DISP_DONTSTEAL; 13407c478bd9Sstevel@tonic-gate } 13417c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = tpri; 13427c478bd9Sstevel@tonic-gate } 13437c478bd9Sstevel@tonic-gate (*disp_enq_thread)(cp, bound); 13447c478bd9Sstevel@tonic-gate } 13457c478bd9Sstevel@tonic-gate 13467c478bd9Sstevel@tonic-gate /* 13477c478bd9Sstevel@tonic-gate * Put the specified thread on the front of the dispatcher 13487c478bd9Sstevel@tonic-gate * queue corresponding to its current priority. 13497c478bd9Sstevel@tonic-gate * 13507c478bd9Sstevel@tonic-gate * Called with the thread in transition, onproc or stopped state 13517c478bd9Sstevel@tonic-gate * and locked (transition implies locked) and at high spl. 13527c478bd9Sstevel@tonic-gate * Returns with the thread in TS_RUN state and still locked. 13537c478bd9Sstevel@tonic-gate */ 13547c478bd9Sstevel@tonic-gate void 13557c478bd9Sstevel@tonic-gate setfrontdq(kthread_t *tp) 13567c478bd9Sstevel@tonic-gate { 13577c478bd9Sstevel@tonic-gate disp_t *dp; 13587c478bd9Sstevel@tonic-gate dispq_t *dq; 13597c478bd9Sstevel@tonic-gate cpu_t *cp; 13607c478bd9Sstevel@tonic-gate pri_t tpri; 13617c478bd9Sstevel@tonic-gate int bound; 13627c478bd9Sstevel@tonic-gate 13637c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 13647c478bd9Sstevel@tonic-gate ASSERT((tp->t_schedflag & TS_ALLSTART) == 0); 13657c478bd9Sstevel@tonic-gate ASSERT(!thread_on_queue(tp)); /* make sure tp isn't on a runq */ 13667c478bd9Sstevel@tonic-gate 13677c478bd9Sstevel@tonic-gate /* 13687c478bd9Sstevel@tonic-gate * If thread is "swapped" or on the swap queue don't 13697c478bd9Sstevel@tonic-gate * queue it, but wake sched. 13707c478bd9Sstevel@tonic-gate */ 13717c478bd9Sstevel@tonic-gate if ((tp->t_schedflag & (TS_LOAD | TS_ON_SWAPQ)) != TS_LOAD) { 13727c478bd9Sstevel@tonic-gate disp_swapped_setrun(tp); 13737c478bd9Sstevel@tonic-gate return; 13747c478bd9Sstevel@tonic-gate } 13757c478bd9Sstevel@tonic-gate 1376abd41583Sgd if (tp->t_bound_cpu || tp->t_weakbound_cpu) 1377abd41583Sgd bound = 1; 1378abd41583Sgd else 1379abd41583Sgd bound = 0; 1380abd41583Sgd 13817c478bd9Sstevel@tonic-gate tpri = DISP_PRIO(tp); 13827c478bd9Sstevel@tonic-gate if (ncpus == 1) 13837c478bd9Sstevel@tonic-gate cp = tp->t_cpu; 1384abd41583Sgd else if (!bound) { 13857c478bd9Sstevel@tonic-gate if (tpri >= kpqpri) { 13867c478bd9Sstevel@tonic-gate setkpdq(tp, SETKP_FRONT); 13877c478bd9Sstevel@tonic-gate return; 13887c478bd9Sstevel@tonic-gate } 13897c478bd9Sstevel@tonic-gate cp = tp->t_cpu; 13907c478bd9Sstevel@tonic-gate if (tp->t_cpupart == cp->cpu_part) { 13917c478bd9Sstevel@tonic-gate /* 13926890d023SEric Saxe * We'll generally let this thread continue to run 13936890d023SEric Saxe * where it last ran, but will consider migration if: 13946890d023SEric Saxe * - The thread last ran outside it's home lgroup. 13956890d023SEric Saxe * - The CPU where it last ran is the target of an 13966890d023SEric Saxe * offline request (a thread_nomigrate() on the in 13976890d023SEric Saxe * motion CPU relies on this when forcing a preempt). 13986890d023SEric Saxe * - The thread isn't the highest priority thread where 13996890d023SEric Saxe * it last ran, and it is considered not likely to 14006890d023SEric Saxe * have significant cache warmth. 14017c478bd9Sstevel@tonic-gate */ 14026890d023SEric Saxe if ((!LGRP_CONTAINS_CPU(tp->t_lpl->lpl_lgrp, cp)) || 14036890d023SEric Saxe (cp == cpu_inmotion)) { 14046890d023SEric Saxe cp = disp_lowpri_cpu(tp->t_cpu, tp->t_lpl, tpri, 14056890d023SEric Saxe (tp == curthread) ? cp : NULL); 14066890d023SEric Saxe } else if ((tpri < cp->cpu_disp->disp_maxrunpri) && 14076890d023SEric Saxe (!THREAD_HAS_CACHE_WARMTH(tp))) { 14086890d023SEric Saxe cp = disp_lowpri_cpu(tp->t_cpu, tp->t_lpl, tpri, 14096890d023SEric Saxe NULL); 14106890d023SEric Saxe } 14117c478bd9Sstevel@tonic-gate } else { 14127c478bd9Sstevel@tonic-gate /* 14137c478bd9Sstevel@tonic-gate * Migrate to a cpu in the new partition. 14147c478bd9Sstevel@tonic-gate */ 14157c478bd9Sstevel@tonic-gate cp = disp_lowpri_cpu(tp->t_cpupart->cp_cpulist, 14167c478bd9Sstevel@tonic-gate tp->t_lpl, tp->t_pri, NULL); 14177c478bd9Sstevel@tonic-gate } 14187c478bd9Sstevel@tonic-gate ASSERT((cp->cpu_flags & CPU_QUIESCED) == 0); 14197c478bd9Sstevel@tonic-gate } else { 14207c478bd9Sstevel@tonic-gate /* 14217c478bd9Sstevel@tonic-gate * It is possible that t_weakbound_cpu != t_bound_cpu (for 14227c478bd9Sstevel@tonic-gate * a short time until weak binding that existed when the 14237c478bd9Sstevel@tonic-gate * strong binding was established has dropped) so we must 14247c478bd9Sstevel@tonic-gate * favour weak binding over strong. 14257c478bd9Sstevel@tonic-gate */ 14267c478bd9Sstevel@tonic-gate cp = tp->t_weakbound_cpu ? 14277c478bd9Sstevel@tonic-gate tp->t_weakbound_cpu : tp->t_bound_cpu; 14287c478bd9Sstevel@tonic-gate } 1429f2bd4627Sjohansen 1430f2bd4627Sjohansen /* 1431f2bd4627Sjohansen * A thread that is ONPROC may be temporarily placed on the run queue 1432f2bd4627Sjohansen * but then chosen to run again by disp. If the thread we're placing on 1433f2bd4627Sjohansen * the queue is in TS_ONPROC state, don't set its t_waitrq until a 1434f2bd4627Sjohansen * replacement process is actually scheduled in swtch(). In this 1435f2bd4627Sjohansen * situation, curthread is the only thread that could be in the ONPROC 1436f2bd4627Sjohansen * state. 1437f2bd4627Sjohansen */ 1438f2bd4627Sjohansen if ((tp != curthread) && (tp->t_waitrq == 0)) { 1439f2bd4627Sjohansen hrtime_t curtime; 1440f2bd4627Sjohansen 1441f2bd4627Sjohansen curtime = gethrtime_unscaled(); 1442f2bd4627Sjohansen (void) cpu_update_pct(tp, curtime); 1443f2bd4627Sjohansen tp->t_waitrq = curtime; 1444f2bd4627Sjohansen } else { 1445f2bd4627Sjohansen (void) cpu_update_pct(tp, gethrtime_unscaled()); 1446f2bd4627Sjohansen } 1447f2bd4627Sjohansen 14487c478bd9Sstevel@tonic-gate dp = cp->cpu_disp; 14497c478bd9Sstevel@tonic-gate disp_lock_enter_high(&dp->disp_lock); 14507c478bd9Sstevel@tonic-gate 14517c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_DISP, TR_FRONTQ, "frontq:pri %d tid %p", tpri, tp); 14527c478bd9Sstevel@tonic-gate DTRACE_SCHED3(enqueue, kthread_t *, tp, disp_t *, dp, int, 1); 14537c478bd9Sstevel@tonic-gate 14547c478bd9Sstevel@tonic-gate #ifndef NPROBE 14557c478bd9Sstevel@tonic-gate /* Kernel probe */ 14567c478bd9Sstevel@tonic-gate if (tnf_tracing_active) 14577c478bd9Sstevel@tonic-gate tnf_thread_queue(tp, cp, tpri); 14587c478bd9Sstevel@tonic-gate #endif /* NPROBE */ 14597c478bd9Sstevel@tonic-gate 14607c478bd9Sstevel@tonic-gate ASSERT(tpri >= 0 && tpri < dp->disp_npri); 14617c478bd9Sstevel@tonic-gate 14627c478bd9Sstevel@tonic-gate THREAD_RUN(tp, &dp->disp_lock); /* set TS_RUN state and lock */ 14637c478bd9Sstevel@tonic-gate tp->t_disp_queue = dp; 14647c478bd9Sstevel@tonic-gate 14657c478bd9Sstevel@tonic-gate dq = &dp->disp_q[tpri]; 14667c478bd9Sstevel@tonic-gate dp->disp_nrunnable++; 1467685679f7Sakolb if (!bound) 1468685679f7Sakolb dp->disp_steal = 0; 14697c478bd9Sstevel@tonic-gate membar_enter(); 14707c478bd9Sstevel@tonic-gate 14717c478bd9Sstevel@tonic-gate if (dq->dq_sruncnt++ != 0) { 14727c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last != NULL); 14737c478bd9Sstevel@tonic-gate tp->t_link = dq->dq_first; 14747c478bd9Sstevel@tonic-gate dq->dq_first = tp; 14757c478bd9Sstevel@tonic-gate } else { 14767c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last == NULL); 14777c478bd9Sstevel@tonic-gate ASSERT(dq->dq_first == NULL); 14787c478bd9Sstevel@tonic-gate tp->t_link = NULL; 14797c478bd9Sstevel@tonic-gate dq->dq_first = dq->dq_last = tp; 14807c478bd9Sstevel@tonic-gate BT_SET(dp->disp_qactmap, tpri); 14817c478bd9Sstevel@tonic-gate if (tpri > dp->disp_maxrunpri) { 14827c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = tpri; 14837c478bd9Sstevel@tonic-gate membar_enter(); 14847c478bd9Sstevel@tonic-gate cpu_resched(cp, tpri); 14857c478bd9Sstevel@tonic-gate } 14867c478bd9Sstevel@tonic-gate } 14877c478bd9Sstevel@tonic-gate 14887c478bd9Sstevel@tonic-gate if (!bound && tpri > dp->disp_max_unbound_pri) { 14897c478bd9Sstevel@tonic-gate if (tp == curthread && dp->disp_max_unbound_pri == -1 && 14907c478bd9Sstevel@tonic-gate cp == CPU) { 14917c478bd9Sstevel@tonic-gate /* 14927c478bd9Sstevel@tonic-gate * If there are no other unbound threads on the 14937c478bd9Sstevel@tonic-gate * run queue, don't allow other CPUs to steal 14947c478bd9Sstevel@tonic-gate * this thread while we are in the middle of a 14957c478bd9Sstevel@tonic-gate * context switch. We may just switch to it 14967c478bd9Sstevel@tonic-gate * again right away. CPU_DISP_DONTSTEAL is cleared 14977c478bd9Sstevel@tonic-gate * in swtch and swtch_to. 14987c478bd9Sstevel@tonic-gate */ 14997c478bd9Sstevel@tonic-gate cp->cpu_disp_flags |= CPU_DISP_DONTSTEAL; 15007c478bd9Sstevel@tonic-gate } 15017c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = tpri; 15027c478bd9Sstevel@tonic-gate } 15037c478bd9Sstevel@tonic-gate (*disp_enq_thread)(cp, bound); 15047c478bd9Sstevel@tonic-gate } 15057c478bd9Sstevel@tonic-gate 15067c478bd9Sstevel@tonic-gate /* 15077c478bd9Sstevel@tonic-gate * Put a high-priority unbound thread on the kp queue 15087c478bd9Sstevel@tonic-gate */ 15097c478bd9Sstevel@tonic-gate static void 15107c478bd9Sstevel@tonic-gate setkpdq(kthread_t *tp, int borf) 15117c478bd9Sstevel@tonic-gate { 15127c478bd9Sstevel@tonic-gate dispq_t *dq; 15137c478bd9Sstevel@tonic-gate disp_t *dp; 15147c478bd9Sstevel@tonic-gate cpu_t *cp; 15157c478bd9Sstevel@tonic-gate pri_t tpri; 15167c478bd9Sstevel@tonic-gate 15177c478bd9Sstevel@tonic-gate tpri = DISP_PRIO(tp); 15187c478bd9Sstevel@tonic-gate 15197c478bd9Sstevel@tonic-gate dp = &tp->t_cpupart->cp_kp_queue; 15207c478bd9Sstevel@tonic-gate disp_lock_enter_high(&dp->disp_lock); 15217c478bd9Sstevel@tonic-gate 15227c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_DISP, TR_FRONTQ, "frontq:pri %d tid %p", tpri, tp); 15237c478bd9Sstevel@tonic-gate 15247c478bd9Sstevel@tonic-gate ASSERT(tpri >= 0 && tpri < dp->disp_npri); 15257c478bd9Sstevel@tonic-gate DTRACE_SCHED3(enqueue, kthread_t *, tp, disp_t *, dp, int, borf); 15267c478bd9Sstevel@tonic-gate THREAD_RUN(tp, &dp->disp_lock); /* set t_state to TS_RUN */ 15277c478bd9Sstevel@tonic-gate tp->t_disp_queue = dp; 15287c478bd9Sstevel@tonic-gate dp->disp_nrunnable++; 15297c478bd9Sstevel@tonic-gate dq = &dp->disp_q[tpri]; 15307c478bd9Sstevel@tonic-gate 15317c478bd9Sstevel@tonic-gate if (dq->dq_sruncnt++ != 0) { 15327c478bd9Sstevel@tonic-gate if (borf == SETKP_BACK) { 15337c478bd9Sstevel@tonic-gate ASSERT(dq->dq_first != NULL); 15347c478bd9Sstevel@tonic-gate tp->t_link = NULL; 15357c478bd9Sstevel@tonic-gate dq->dq_last->t_link = tp; 15367c478bd9Sstevel@tonic-gate dq->dq_last = tp; 15377c478bd9Sstevel@tonic-gate } else { 15387c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last != NULL); 15397c478bd9Sstevel@tonic-gate tp->t_link = dq->dq_first; 15407c478bd9Sstevel@tonic-gate dq->dq_first = tp; 15417c478bd9Sstevel@tonic-gate } 15427c478bd9Sstevel@tonic-gate } else { 15437c478bd9Sstevel@tonic-gate if (borf == SETKP_BACK) { 15447c478bd9Sstevel@tonic-gate ASSERT(dq->dq_first == NULL); 15457c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last == NULL); 15467c478bd9Sstevel@tonic-gate dq->dq_first = dq->dq_last = tp; 15477c478bd9Sstevel@tonic-gate } else { 15487c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last == NULL); 15497c478bd9Sstevel@tonic-gate ASSERT(dq->dq_first == NULL); 15507c478bd9Sstevel@tonic-gate tp->t_link = NULL; 15517c478bd9Sstevel@tonic-gate dq->dq_first = dq->dq_last = tp; 15527c478bd9Sstevel@tonic-gate } 15537c478bd9Sstevel@tonic-gate BT_SET(dp->disp_qactmap, tpri); 15547c478bd9Sstevel@tonic-gate if (tpri > dp->disp_max_unbound_pri) 15557c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = tpri; 15567c478bd9Sstevel@tonic-gate if (tpri > dp->disp_maxrunpri) { 15577c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = tpri; 15587c478bd9Sstevel@tonic-gate membar_enter(); 15597c478bd9Sstevel@tonic-gate } 15607c478bd9Sstevel@tonic-gate } 15617c478bd9Sstevel@tonic-gate 15627c478bd9Sstevel@tonic-gate cp = tp->t_cpu; 15637c478bd9Sstevel@tonic-gate if (tp->t_cpupart != cp->cpu_part) { 15647c478bd9Sstevel@tonic-gate /* migrate to a cpu in the new partition */ 15657c478bd9Sstevel@tonic-gate cp = tp->t_cpupart->cp_cpulist; 15667c478bd9Sstevel@tonic-gate } 15677c478bd9Sstevel@tonic-gate cp = disp_lowpri_cpu(cp, tp->t_lpl, tp->t_pri, NULL); 15687c478bd9Sstevel@tonic-gate disp_lock_enter_high(&cp->cpu_disp->disp_lock); 15697c478bd9Sstevel@tonic-gate ASSERT((cp->cpu_flags & CPU_QUIESCED) == 0); 15707c478bd9Sstevel@tonic-gate 15717c478bd9Sstevel@tonic-gate #ifndef NPROBE 15727c478bd9Sstevel@tonic-gate /* Kernel probe */ 15737c478bd9Sstevel@tonic-gate if (tnf_tracing_active) 15747c478bd9Sstevel@tonic-gate tnf_thread_queue(tp, cp, tpri); 15757c478bd9Sstevel@tonic-gate #endif /* NPROBE */ 15767c478bd9Sstevel@tonic-gate 15777c478bd9Sstevel@tonic-gate if (cp->cpu_chosen_level < tpri) 15787c478bd9Sstevel@tonic-gate cp->cpu_chosen_level = tpri; 15797c478bd9Sstevel@tonic-gate cpu_resched(cp, tpri); 15807c478bd9Sstevel@tonic-gate disp_lock_exit_high(&cp->cpu_disp->disp_lock); 15817c478bd9Sstevel@tonic-gate (*disp_enq_thread)(cp, 0); 15827c478bd9Sstevel@tonic-gate } 15837c478bd9Sstevel@tonic-gate 15847c478bd9Sstevel@tonic-gate /* 15857c478bd9Sstevel@tonic-gate * Remove a thread from the dispatcher queue if it is on it. 15867c478bd9Sstevel@tonic-gate * It is not an error if it is not found but we return whether 15877c478bd9Sstevel@tonic-gate * or not it was found in case the caller wants to check. 15887c478bd9Sstevel@tonic-gate */ 15897c478bd9Sstevel@tonic-gate int 15907c478bd9Sstevel@tonic-gate dispdeq(kthread_t *tp) 15917c478bd9Sstevel@tonic-gate { 15927c478bd9Sstevel@tonic-gate disp_t *dp; 15937c478bd9Sstevel@tonic-gate dispq_t *dq; 15947c478bd9Sstevel@tonic-gate kthread_t *rp; 15957c478bd9Sstevel@tonic-gate kthread_t *trp; 15967c478bd9Sstevel@tonic-gate kthread_t **ptp; 15977c478bd9Sstevel@tonic-gate int tpri; 15987c478bd9Sstevel@tonic-gate 15997c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 16007c478bd9Sstevel@tonic-gate 16017c478bd9Sstevel@tonic-gate if (tp->t_state != TS_RUN) 16027c478bd9Sstevel@tonic-gate return (0); 16037c478bd9Sstevel@tonic-gate 16047c478bd9Sstevel@tonic-gate /* 16057c478bd9Sstevel@tonic-gate * The thread is "swapped" or is on the swap queue and 16067c478bd9Sstevel@tonic-gate * hence no longer on the run queue, so return true. 16077c478bd9Sstevel@tonic-gate */ 16087c478bd9Sstevel@tonic-gate if ((tp->t_schedflag & (TS_LOAD | TS_ON_SWAPQ)) != TS_LOAD) 16097c478bd9Sstevel@tonic-gate return (1); 16107c478bd9Sstevel@tonic-gate 16117c478bd9Sstevel@tonic-gate tpri = DISP_PRIO(tp); 16127c478bd9Sstevel@tonic-gate dp = tp->t_disp_queue; 16137c478bd9Sstevel@tonic-gate ASSERT(tpri < dp->disp_npri); 16147c478bd9Sstevel@tonic-gate dq = &dp->disp_q[tpri]; 16157c478bd9Sstevel@tonic-gate ptp = &dq->dq_first; 16167c478bd9Sstevel@tonic-gate rp = *ptp; 16177c478bd9Sstevel@tonic-gate trp = NULL; 16187c478bd9Sstevel@tonic-gate 16197c478bd9Sstevel@tonic-gate ASSERT(dq->dq_last == NULL || dq->dq_last->t_link == NULL); 16207c478bd9Sstevel@tonic-gate 16217c478bd9Sstevel@tonic-gate /* 16227c478bd9Sstevel@tonic-gate * Search for thread in queue. 16237c478bd9Sstevel@tonic-gate * Double links would simplify this at the expense of disp/setrun. 16247c478bd9Sstevel@tonic-gate */ 16257c478bd9Sstevel@tonic-gate while (rp != tp && rp != NULL) { 16267c478bd9Sstevel@tonic-gate trp = rp; 16277c478bd9Sstevel@tonic-gate ptp = &trp->t_link; 16287c478bd9Sstevel@tonic-gate rp = trp->t_link; 16297c478bd9Sstevel@tonic-gate } 16307c478bd9Sstevel@tonic-gate 16317c478bd9Sstevel@tonic-gate if (rp == NULL) { 16327c478bd9Sstevel@tonic-gate panic("dispdeq: thread not on queue"); 16337c478bd9Sstevel@tonic-gate } 16347c478bd9Sstevel@tonic-gate 16357c478bd9Sstevel@tonic-gate DTRACE_SCHED2(dequeue, kthread_t *, tp, disp_t *, dp); 16367c478bd9Sstevel@tonic-gate 16377c478bd9Sstevel@tonic-gate /* 16387c478bd9Sstevel@tonic-gate * Found it so remove it from queue. 16397c478bd9Sstevel@tonic-gate */ 16407c478bd9Sstevel@tonic-gate if ((*ptp = rp->t_link) == NULL) 16417c478bd9Sstevel@tonic-gate dq->dq_last = trp; 16427c478bd9Sstevel@tonic-gate 16437c478bd9Sstevel@tonic-gate dp->disp_nrunnable--; 16447c478bd9Sstevel@tonic-gate if (--dq->dq_sruncnt == 0) { 16457c478bd9Sstevel@tonic-gate dp->disp_qactmap[tpri >> BT_ULSHIFT] &= ~BT_BIW(tpri); 16467c478bd9Sstevel@tonic-gate if (dp->disp_nrunnable == 0) { 16477c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = -1; 16487c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = -1; 16497c478bd9Sstevel@tonic-gate } else if (tpri == dp->disp_maxrunpri) { 16507c478bd9Sstevel@tonic-gate int ipri; 16517c478bd9Sstevel@tonic-gate 16527c478bd9Sstevel@tonic-gate ipri = bt_gethighbit(dp->disp_qactmap, 16537c478bd9Sstevel@tonic-gate dp->disp_maxrunpri >> BT_ULSHIFT); 16547c478bd9Sstevel@tonic-gate if (ipri < dp->disp_max_unbound_pri) 16557c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = ipri; 16567c478bd9Sstevel@tonic-gate dp->disp_maxrunpri = ipri; 16577c478bd9Sstevel@tonic-gate } 16587c478bd9Sstevel@tonic-gate } 16597c478bd9Sstevel@tonic-gate tp->t_link = NULL; 16607c478bd9Sstevel@tonic-gate THREAD_TRANSITION(tp); /* put in intermediate state */ 16617c478bd9Sstevel@tonic-gate return (1); 16627c478bd9Sstevel@tonic-gate } 16637c478bd9Sstevel@tonic-gate 16647c478bd9Sstevel@tonic-gate 16657c478bd9Sstevel@tonic-gate /* 16667c478bd9Sstevel@tonic-gate * dq_sruninc and dq_srundec are public functions for 16677c478bd9Sstevel@tonic-gate * incrementing/decrementing the sruncnts when a thread on 16687c478bd9Sstevel@tonic-gate * a dispatcher queue is made schedulable/unschedulable by 16697c478bd9Sstevel@tonic-gate * resetting the TS_LOAD flag. 16707c478bd9Sstevel@tonic-gate * 16717c478bd9Sstevel@tonic-gate * The caller MUST have the thread lock and therefore the dispatcher 16727c478bd9Sstevel@tonic-gate * queue lock so that the operation which changes 16737c478bd9Sstevel@tonic-gate * the flag, the operation that checks the status of the thread to 16747c478bd9Sstevel@tonic-gate * determine if it's on a disp queue AND the call to this function 16757c478bd9Sstevel@tonic-gate * are one atomic operation with respect to interrupts. 16767c478bd9Sstevel@tonic-gate */ 16777c478bd9Sstevel@tonic-gate 16787c478bd9Sstevel@tonic-gate /* 16797c478bd9Sstevel@tonic-gate * Called by sched AFTER TS_LOAD flag is set on a swapped, runnable thread. 16807c478bd9Sstevel@tonic-gate */ 16817c478bd9Sstevel@tonic-gate void 16827c478bd9Sstevel@tonic-gate dq_sruninc(kthread_t *t) 16837c478bd9Sstevel@tonic-gate { 16847c478bd9Sstevel@tonic-gate ASSERT(t->t_state == TS_RUN); 16857c478bd9Sstevel@tonic-gate ASSERT(t->t_schedflag & TS_LOAD); 16867c478bd9Sstevel@tonic-gate 16877c478bd9Sstevel@tonic-gate THREAD_TRANSITION(t); 16887c478bd9Sstevel@tonic-gate setfrontdq(t); 16897c478bd9Sstevel@tonic-gate } 16907c478bd9Sstevel@tonic-gate 16917c478bd9Sstevel@tonic-gate /* 16927c478bd9Sstevel@tonic-gate * See comment on calling conventions above. 16937c478bd9Sstevel@tonic-gate * Called by sched BEFORE TS_LOAD flag is cleared on a runnable thread. 16947c478bd9Sstevel@tonic-gate */ 16957c478bd9Sstevel@tonic-gate void 16967c478bd9Sstevel@tonic-gate dq_srundec(kthread_t *t) 16977c478bd9Sstevel@tonic-gate { 16987c478bd9Sstevel@tonic-gate ASSERT(t->t_schedflag & TS_LOAD); 16997c478bd9Sstevel@tonic-gate 17007c478bd9Sstevel@tonic-gate (void) dispdeq(t); 17017c478bd9Sstevel@tonic-gate disp_swapped_enq(t); 17027c478bd9Sstevel@tonic-gate } 17037c478bd9Sstevel@tonic-gate 17047c478bd9Sstevel@tonic-gate /* 17057c478bd9Sstevel@tonic-gate * Change the dispatcher lock of thread to the "swapped_lock" 17067c478bd9Sstevel@tonic-gate * and return with thread lock still held. 17077c478bd9Sstevel@tonic-gate * 17087c478bd9Sstevel@tonic-gate * Called with thread_lock held, in transition state, and at high spl. 17097c478bd9Sstevel@tonic-gate */ 17107c478bd9Sstevel@tonic-gate void 17117c478bd9Sstevel@tonic-gate disp_swapped_enq(kthread_t *tp) 17127c478bd9Sstevel@tonic-gate { 17137c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 17147c478bd9Sstevel@tonic-gate ASSERT(tp->t_schedflag & TS_LOAD); 17157c478bd9Sstevel@tonic-gate 17167c478bd9Sstevel@tonic-gate switch (tp->t_state) { 17177c478bd9Sstevel@tonic-gate case TS_RUN: 17187c478bd9Sstevel@tonic-gate disp_lock_enter_high(&swapped_lock); 17197c478bd9Sstevel@tonic-gate THREAD_SWAP(tp, &swapped_lock); /* set TS_RUN state and lock */ 17207c478bd9Sstevel@tonic-gate break; 17217c478bd9Sstevel@tonic-gate case TS_ONPROC: 17227c478bd9Sstevel@tonic-gate disp_lock_enter_high(&swapped_lock); 17237c478bd9Sstevel@tonic-gate THREAD_TRANSITION(tp); 17247c478bd9Sstevel@tonic-gate wake_sched_sec = 1; /* tell clock to wake sched */ 17257c478bd9Sstevel@tonic-gate THREAD_SWAP(tp, &swapped_lock); /* set TS_RUN state and lock */ 17267c478bd9Sstevel@tonic-gate break; 17277c478bd9Sstevel@tonic-gate default: 17287c478bd9Sstevel@tonic-gate panic("disp_swapped: tp: %p bad t_state", (void *)tp); 17297c478bd9Sstevel@tonic-gate } 17307c478bd9Sstevel@tonic-gate } 17317c478bd9Sstevel@tonic-gate 17327c478bd9Sstevel@tonic-gate /* 17337c478bd9Sstevel@tonic-gate * This routine is called by setbackdq/setfrontdq if the thread is 17347c478bd9Sstevel@tonic-gate * not loaded or loaded and on the swap queue. 17357c478bd9Sstevel@tonic-gate * 17367c478bd9Sstevel@tonic-gate * Thread state TS_SLEEP implies that a swapped thread 17377c478bd9Sstevel@tonic-gate * has been woken up and needs to be swapped in by the swapper. 17387c478bd9Sstevel@tonic-gate * 17397c478bd9Sstevel@tonic-gate * Thread state TS_RUN, it implies that the priority of a swapped 17407c478bd9Sstevel@tonic-gate * thread is being increased by scheduling class (e.g. ts_update). 17417c478bd9Sstevel@tonic-gate */ 17427c478bd9Sstevel@tonic-gate static void 17437c478bd9Sstevel@tonic-gate disp_swapped_setrun(kthread_t *tp) 17447c478bd9Sstevel@tonic-gate { 17457c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 17467c478bd9Sstevel@tonic-gate ASSERT((tp->t_schedflag & (TS_LOAD | TS_ON_SWAPQ)) != TS_LOAD); 17477c478bd9Sstevel@tonic-gate 17487c478bd9Sstevel@tonic-gate switch (tp->t_state) { 17497c478bd9Sstevel@tonic-gate case TS_SLEEP: 17507c478bd9Sstevel@tonic-gate disp_lock_enter_high(&swapped_lock); 17517c478bd9Sstevel@tonic-gate /* 17527c478bd9Sstevel@tonic-gate * Wakeup sched immediately (i.e., next tick) if the 17537c478bd9Sstevel@tonic-gate * thread priority is above maxclsyspri. 17547c478bd9Sstevel@tonic-gate */ 17557c478bd9Sstevel@tonic-gate if (DISP_PRIO(tp) > maxclsyspri) 17567c478bd9Sstevel@tonic-gate wake_sched = 1; 17577c478bd9Sstevel@tonic-gate else 17587c478bd9Sstevel@tonic-gate wake_sched_sec = 1; 17597c478bd9Sstevel@tonic-gate THREAD_RUN(tp, &swapped_lock); /* set TS_RUN state and lock */ 17607c478bd9Sstevel@tonic-gate break; 17617c478bd9Sstevel@tonic-gate case TS_RUN: /* called from ts_update */ 17627c478bd9Sstevel@tonic-gate break; 17637c478bd9Sstevel@tonic-gate default: 17648793b36bSNick Todd panic("disp_swapped_setrun: tp: %p bad t_state", (void *)tp); 17657c478bd9Sstevel@tonic-gate } 17667c478bd9Sstevel@tonic-gate } 17677c478bd9Sstevel@tonic-gate 17687c478bd9Sstevel@tonic-gate 17697c478bd9Sstevel@tonic-gate /* 17707c478bd9Sstevel@tonic-gate * Make a thread give up its processor. Find the processor on 17717c478bd9Sstevel@tonic-gate * which this thread is executing, and have that processor 17727c478bd9Sstevel@tonic-gate * preempt. 17737c478bd9Sstevel@tonic-gate */ 17747c478bd9Sstevel@tonic-gate void 17757c478bd9Sstevel@tonic-gate cpu_surrender(kthread_t *tp) 17767c478bd9Sstevel@tonic-gate { 17777c478bd9Sstevel@tonic-gate cpu_t *cpup; 17787c478bd9Sstevel@tonic-gate int max_pri; 17797c478bd9Sstevel@tonic-gate int max_run_pri; 17807c478bd9Sstevel@tonic-gate klwp_t *lwp; 17817c478bd9Sstevel@tonic-gate 17827c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 17837c478bd9Sstevel@tonic-gate 17847c478bd9Sstevel@tonic-gate if (tp->t_state != TS_ONPROC) 17857c478bd9Sstevel@tonic-gate return; 17867c478bd9Sstevel@tonic-gate cpup = tp->t_disp_queue->disp_cpu; /* CPU thread dispatched to */ 17877c478bd9Sstevel@tonic-gate max_pri = cpup->cpu_disp->disp_maxrunpri; /* best pri of that CPU */ 17887c478bd9Sstevel@tonic-gate max_run_pri = CP_MAXRUNPRI(cpup->cpu_part); 17897c478bd9Sstevel@tonic-gate if (max_pri < max_run_pri) 17907c478bd9Sstevel@tonic-gate max_pri = max_run_pri; 17917c478bd9Sstevel@tonic-gate 17927c478bd9Sstevel@tonic-gate cpup->cpu_runrun = 1; 17937c478bd9Sstevel@tonic-gate if (max_pri >= kpreemptpri && cpup->cpu_kprunrun == 0) { 17947c478bd9Sstevel@tonic-gate cpup->cpu_kprunrun = 1; 17957c478bd9Sstevel@tonic-gate } 17967c478bd9Sstevel@tonic-gate 17977c478bd9Sstevel@tonic-gate /* 17987c478bd9Sstevel@tonic-gate * Propagate cpu_runrun, and cpu_kprunrun to global visibility. 17997c478bd9Sstevel@tonic-gate */ 18007c478bd9Sstevel@tonic-gate membar_enter(); 18017c478bd9Sstevel@tonic-gate 18027c478bd9Sstevel@tonic-gate DTRACE_SCHED1(surrender, kthread_t *, tp); 18037c478bd9Sstevel@tonic-gate 18047c478bd9Sstevel@tonic-gate /* 18057c478bd9Sstevel@tonic-gate * Make the target thread take an excursion through trap() 18067c478bd9Sstevel@tonic-gate * to do preempt() (unless we're already in trap or post_syscall, 18077c478bd9Sstevel@tonic-gate * calling cpu_surrender via CL_TRAPRET). 18087c478bd9Sstevel@tonic-gate */ 18097c478bd9Sstevel@tonic-gate if (tp != curthread || (lwp = tp->t_lwp) == NULL || 18107c478bd9Sstevel@tonic-gate lwp->lwp_state != LWP_USER) { 18117c478bd9Sstevel@tonic-gate aston(tp); 18127c478bd9Sstevel@tonic-gate if (cpup != CPU) 18137c478bd9Sstevel@tonic-gate poke_cpu(cpup->cpu_id); 18147c478bd9Sstevel@tonic-gate } 18157c478bd9Sstevel@tonic-gate TRACE_2(TR_FAC_DISP, TR_CPU_SURRENDER, 18167c478bd9Sstevel@tonic-gate "cpu_surrender:tid %p cpu %p", tp, cpup); 18177c478bd9Sstevel@tonic-gate } 18187c478bd9Sstevel@tonic-gate 18197c478bd9Sstevel@tonic-gate 18207c478bd9Sstevel@tonic-gate /* 18217c478bd9Sstevel@tonic-gate * Commit to and ratify a scheduling decision 18227c478bd9Sstevel@tonic-gate */ 18237c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 18247c478bd9Sstevel@tonic-gate static kthread_t * 18257c478bd9Sstevel@tonic-gate disp_ratify(kthread_t *tp, disp_t *kpq) 18267c478bd9Sstevel@tonic-gate { 18277c478bd9Sstevel@tonic-gate pri_t tpri, maxpri; 18287c478bd9Sstevel@tonic-gate pri_t maxkpri; 18297c478bd9Sstevel@tonic-gate cpu_t *cpup; 18307c478bd9Sstevel@tonic-gate 18317c478bd9Sstevel@tonic-gate ASSERT(tp != NULL); 18327c478bd9Sstevel@tonic-gate /* 18337c478bd9Sstevel@tonic-gate * Commit to, then ratify scheduling decision 18347c478bd9Sstevel@tonic-gate */ 18357c478bd9Sstevel@tonic-gate cpup = CPU; 18367c478bd9Sstevel@tonic-gate if (cpup->cpu_runrun != 0) 18377c478bd9Sstevel@tonic-gate cpup->cpu_runrun = 0; 18387c478bd9Sstevel@tonic-gate if (cpup->cpu_kprunrun != 0) 18397c478bd9Sstevel@tonic-gate cpup->cpu_kprunrun = 0; 18407c478bd9Sstevel@tonic-gate if (cpup->cpu_chosen_level != -1) 18417c478bd9Sstevel@tonic-gate cpup->cpu_chosen_level = -1; 18427c478bd9Sstevel@tonic-gate membar_enter(); 18437c478bd9Sstevel@tonic-gate tpri = DISP_PRIO(tp); 18447c478bd9Sstevel@tonic-gate maxpri = cpup->cpu_disp->disp_maxrunpri; 18457c478bd9Sstevel@tonic-gate maxkpri = kpq->disp_maxrunpri; 18467c478bd9Sstevel@tonic-gate if (maxpri < maxkpri) 18477c478bd9Sstevel@tonic-gate maxpri = maxkpri; 18487c478bd9Sstevel@tonic-gate if (tpri < maxpri) { 18497c478bd9Sstevel@tonic-gate /* 18507c478bd9Sstevel@tonic-gate * should have done better 18517c478bd9Sstevel@tonic-gate * put this one back and indicate to try again 18527c478bd9Sstevel@tonic-gate */ 18537c478bd9Sstevel@tonic-gate cpup->cpu_dispthread = curthread; /* fixup dispthread */ 18547c478bd9Sstevel@tonic-gate cpup->cpu_dispatch_pri = DISP_PRIO(curthread); 18557c478bd9Sstevel@tonic-gate thread_lock_high(tp); 18567c478bd9Sstevel@tonic-gate THREAD_TRANSITION(tp); 18577c478bd9Sstevel@tonic-gate setfrontdq(tp); 18587c478bd9Sstevel@tonic-gate thread_unlock_nopreempt(tp); 18597c478bd9Sstevel@tonic-gate 18607c478bd9Sstevel@tonic-gate tp = NULL; 18617c478bd9Sstevel@tonic-gate } 18627c478bd9Sstevel@tonic-gate return (tp); 18637c478bd9Sstevel@tonic-gate } 18647c478bd9Sstevel@tonic-gate 18657c478bd9Sstevel@tonic-gate /* 18667c478bd9Sstevel@tonic-gate * See if there is any work on the dispatcher queue for other CPUs. 18677c478bd9Sstevel@tonic-gate * If there is, dequeue the best thread and return. 18687c478bd9Sstevel@tonic-gate */ 18697c478bd9Sstevel@tonic-gate static kthread_t * 18707c478bd9Sstevel@tonic-gate disp_getwork(cpu_t *cp) 18717c478bd9Sstevel@tonic-gate { 18727c478bd9Sstevel@tonic-gate cpu_t *ocp; /* other CPU */ 18737c478bd9Sstevel@tonic-gate cpu_t *ocp_start; 18747c478bd9Sstevel@tonic-gate cpu_t *tcp; /* target local CPU */ 18757c478bd9Sstevel@tonic-gate kthread_t *tp; 1876685679f7Sakolb kthread_t *retval = NULL; 18777c478bd9Sstevel@tonic-gate pri_t maxpri; 18787c478bd9Sstevel@tonic-gate disp_t *kpq; /* kp queue for this partition */ 18797c478bd9Sstevel@tonic-gate lpl_t *lpl, *lpl_leaf; 18806890d023SEric Saxe int leafidx, startidx; 1881685679f7Sakolb hrtime_t stealtime; 18826890d023SEric Saxe lgrp_id_t local_id; 18837c478bd9Sstevel@tonic-gate 18847c478bd9Sstevel@tonic-gate maxpri = -1; 18857c478bd9Sstevel@tonic-gate tcp = NULL; 18867c478bd9Sstevel@tonic-gate 18877c478bd9Sstevel@tonic-gate kpq = &cp->cpu_part->cp_kp_queue; 18887c478bd9Sstevel@tonic-gate while (kpq->disp_maxrunpri >= 0) { 18897c478bd9Sstevel@tonic-gate /* 18907c478bd9Sstevel@tonic-gate * Try to take a thread from the kp_queue. 18917c478bd9Sstevel@tonic-gate */ 18927c478bd9Sstevel@tonic-gate tp = (disp_getbest(kpq)); 18937c478bd9Sstevel@tonic-gate if (tp) 18947c478bd9Sstevel@tonic-gate return (disp_ratify(tp, kpq)); 18957c478bd9Sstevel@tonic-gate } 18967c478bd9Sstevel@tonic-gate 1897ab761399Sesaxe kpreempt_disable(); /* protect the cpu_active list */ 18987c478bd9Sstevel@tonic-gate 18997c478bd9Sstevel@tonic-gate /* 19007c478bd9Sstevel@tonic-gate * Try to find something to do on another CPU's run queue. 19017c478bd9Sstevel@tonic-gate * Loop through all other CPUs looking for the one with the highest 19027c478bd9Sstevel@tonic-gate * priority unbound thread. 19037c478bd9Sstevel@tonic-gate * 19047c478bd9Sstevel@tonic-gate * On NUMA machines, the partition's CPUs are consulted in order of 19057c478bd9Sstevel@tonic-gate * distance from the current CPU. This way, the first available 19067c478bd9Sstevel@tonic-gate * work found is also the closest, and will suffer the least 19077c478bd9Sstevel@tonic-gate * from being migrated. 19087c478bd9Sstevel@tonic-gate */ 19097c478bd9Sstevel@tonic-gate lpl = lpl_leaf = cp->cpu_lpl; 19106890d023SEric Saxe local_id = lpl_leaf->lpl_lgrpid; 19116890d023SEric Saxe leafidx = startidx = 0; 19127c478bd9Sstevel@tonic-gate 19137c478bd9Sstevel@tonic-gate /* 19147c478bd9Sstevel@tonic-gate * This loop traverses the lpl hierarchy. Higher level lpls represent 19157c478bd9Sstevel@tonic-gate * broader levels of locality 19167c478bd9Sstevel@tonic-gate */ 19177c478bd9Sstevel@tonic-gate do { 19187c478bd9Sstevel@tonic-gate /* This loop iterates over the lpl's leaves */ 19197c478bd9Sstevel@tonic-gate do { 19207c478bd9Sstevel@tonic-gate if (lpl_leaf != cp->cpu_lpl) 19217c478bd9Sstevel@tonic-gate ocp = lpl_leaf->lpl_cpus; 19227c478bd9Sstevel@tonic-gate else 19237c478bd9Sstevel@tonic-gate ocp = cp->cpu_next_lpl; 19247c478bd9Sstevel@tonic-gate 19257c478bd9Sstevel@tonic-gate /* This loop iterates over the CPUs in the leaf */ 19267c478bd9Sstevel@tonic-gate ocp_start = ocp; 19277c478bd9Sstevel@tonic-gate do { 19287c478bd9Sstevel@tonic-gate pri_t pri; 19297c478bd9Sstevel@tonic-gate 19307c478bd9Sstevel@tonic-gate ASSERT(CPU_ACTIVE(ocp)); 19317c478bd9Sstevel@tonic-gate 19327c478bd9Sstevel@tonic-gate /* 193339bac370Sesaxe * End our stroll around this lpl if: 19347c478bd9Sstevel@tonic-gate * 19357c478bd9Sstevel@tonic-gate * - Something became runnable on the local 193639bac370Sesaxe * queue...which also ends our stroll around 193739bac370Sesaxe * the partition. 19387c478bd9Sstevel@tonic-gate * 193939bac370Sesaxe * - We happen across another idle CPU. 194039bac370Sesaxe * Since it is patrolling the next portion 194139bac370Sesaxe * of the lpl's list (assuming it's not 19426890d023SEric Saxe * halted, or busy servicing an interrupt), 19436890d023SEric Saxe * move to the next higher level of locality. 19447c478bd9Sstevel@tonic-gate */ 194539bac370Sesaxe if (cp->cpu_disp->disp_nrunnable != 0) { 194639bac370Sesaxe kpreempt_enable(); 194739bac370Sesaxe return (NULL); 194839bac370Sesaxe } 19497c478bd9Sstevel@tonic-gate if (ocp->cpu_dispatch_pri == -1) { 19507c478bd9Sstevel@tonic-gate if (ocp->cpu_disp_flags & 19516890d023SEric Saxe CPU_DISP_HALTED || 19526890d023SEric Saxe ocp->cpu_intr_actv != 0) 19537c478bd9Sstevel@tonic-gate continue; 195439bac370Sesaxe else 19556890d023SEric Saxe goto next_level; 19567c478bd9Sstevel@tonic-gate } 19577c478bd9Sstevel@tonic-gate 19587c478bd9Sstevel@tonic-gate /* 19597c478bd9Sstevel@tonic-gate * If there's only one thread and the CPU 19607c478bd9Sstevel@tonic-gate * is in the middle of a context switch, 19617c478bd9Sstevel@tonic-gate * or it's currently running the idle thread, 19627c478bd9Sstevel@tonic-gate * don't steal it. 19637c478bd9Sstevel@tonic-gate */ 19647c478bd9Sstevel@tonic-gate if ((ocp->cpu_disp_flags & 1965d129bde2Sesaxe CPU_DISP_DONTSTEAL) && 19667c478bd9Sstevel@tonic-gate ocp->cpu_disp->disp_nrunnable == 1) 19677c478bd9Sstevel@tonic-gate continue; 19687c478bd9Sstevel@tonic-gate 19697c478bd9Sstevel@tonic-gate pri = ocp->cpu_disp->disp_max_unbound_pri; 19707c478bd9Sstevel@tonic-gate if (pri > maxpri) { 1971685679f7Sakolb /* 1972685679f7Sakolb * Don't steal threads that we attempted 1973fb2f18f8Sesaxe * to steal recently until they're ready 1974fb2f18f8Sesaxe * to be stolen again. 1975685679f7Sakolb */ 1976685679f7Sakolb stealtime = ocp->cpu_disp->disp_steal; 1977685679f7Sakolb if (stealtime == 0 || 1978685679f7Sakolb stealtime - gethrtime() <= 0) { 1979685679f7Sakolb maxpri = pri; 1980685679f7Sakolb tcp = ocp; 1981685679f7Sakolb } else { 1982685679f7Sakolb /* 1983685679f7Sakolb * Don't update tcp, just set 1984685679f7Sakolb * the retval to T_DONTSTEAL, so 1985685679f7Sakolb * that if no acceptable CPUs 1986685679f7Sakolb * are found the return value 1987685679f7Sakolb * will be T_DONTSTEAL rather 1988685679f7Sakolb * then NULL. 1989685679f7Sakolb */ 1990685679f7Sakolb retval = T_DONTSTEAL; 1991685679f7Sakolb } 19927c478bd9Sstevel@tonic-gate } 19937c478bd9Sstevel@tonic-gate } while ((ocp = ocp->cpu_next_lpl) != ocp_start); 19947c478bd9Sstevel@tonic-gate 19956890d023SEric Saxe /* 19966890d023SEric Saxe * Iterate to the next leaf lpl in the resource set 19976890d023SEric Saxe * at this level of locality. If we hit the end of 19986890d023SEric Saxe * the set, wrap back around to the beginning. 19996890d023SEric Saxe * 20006890d023SEric Saxe * Note: This iteration is NULL terminated for a reason 20016890d023SEric Saxe * see lpl_topo_bootstrap() in lgrp.c for details. 20026890d023SEric Saxe */ 20037c478bd9Sstevel@tonic-gate if ((lpl_leaf = lpl->lpl_rset[++leafidx]) == NULL) { 20047c478bd9Sstevel@tonic-gate leafidx = 0; 20057c478bd9Sstevel@tonic-gate lpl_leaf = lpl->lpl_rset[leafidx]; 20067c478bd9Sstevel@tonic-gate } 20076890d023SEric Saxe } while (leafidx != startidx); 20087c478bd9Sstevel@tonic-gate 20096890d023SEric Saxe next_level: 20106890d023SEric Saxe /* 20116890d023SEric Saxe * Expand the search to include farther away CPUs (next 20126890d023SEric Saxe * locality level). The closer CPUs that have already been 20136890d023SEric Saxe * checked will be checked again. In doing so, idle CPUs 20146890d023SEric Saxe * will tend to be more aggresive about stealing from CPUs 20156890d023SEric Saxe * that are closer (since the closer CPUs will be considered 20166890d023SEric Saxe * more often). 20176890d023SEric Saxe * Begin at this level with the CPUs local leaf lpl. 20186890d023SEric Saxe */ 20196890d023SEric Saxe if ((lpl = lpl->lpl_parent) != NULL) { 20206890d023SEric Saxe leafidx = startidx = lpl->lpl_id2rset[local_id]; 20216890d023SEric Saxe lpl_leaf = lpl->lpl_rset[leafidx]; 20226890d023SEric Saxe } 20237c478bd9Sstevel@tonic-gate } while (!tcp && lpl); 20247c478bd9Sstevel@tonic-gate 2025ab761399Sesaxe kpreempt_enable(); 20267c478bd9Sstevel@tonic-gate 20277c478bd9Sstevel@tonic-gate /* 20287c478bd9Sstevel@tonic-gate * If another queue looks good, and there is still nothing on 20297c478bd9Sstevel@tonic-gate * the local queue, try to transfer one or more threads 20307c478bd9Sstevel@tonic-gate * from it to our queue. 20317c478bd9Sstevel@tonic-gate */ 20327c478bd9Sstevel@tonic-gate if (tcp && cp->cpu_disp->disp_nrunnable == 0) { 2033685679f7Sakolb tp = disp_getbest(tcp->cpu_disp); 2034685679f7Sakolb if (tp == NULL || tp == T_DONTSTEAL) 2035685679f7Sakolb return (tp); 2036685679f7Sakolb return (disp_ratify(tp, kpq)); 20377c478bd9Sstevel@tonic-gate } 2038685679f7Sakolb return (retval); 20397c478bd9Sstevel@tonic-gate } 20407c478bd9Sstevel@tonic-gate 20417c478bd9Sstevel@tonic-gate 20427c478bd9Sstevel@tonic-gate /* 20437c478bd9Sstevel@tonic-gate * disp_fix_unbound_pri() 20447c478bd9Sstevel@tonic-gate * Determines the maximum priority of unbound threads on the queue. 20457c478bd9Sstevel@tonic-gate * The priority is kept for the queue, but is only increased, never 20467c478bd9Sstevel@tonic-gate * reduced unless some CPU is looking for something on that queue. 20477c478bd9Sstevel@tonic-gate * 20487c478bd9Sstevel@tonic-gate * The priority argument is the known upper limit. 20497c478bd9Sstevel@tonic-gate * 20507c478bd9Sstevel@tonic-gate * Perhaps this should be kept accurately, but that probably means 20517c478bd9Sstevel@tonic-gate * separate bitmaps for bound and unbound threads. Since only idled 20527c478bd9Sstevel@tonic-gate * CPUs will have to do this recalculation, it seems better this way. 20537c478bd9Sstevel@tonic-gate */ 20547c478bd9Sstevel@tonic-gate static void 20557c478bd9Sstevel@tonic-gate disp_fix_unbound_pri(disp_t *dp, pri_t pri) 20567c478bd9Sstevel@tonic-gate { 20577c478bd9Sstevel@tonic-gate kthread_t *tp; 20587c478bd9Sstevel@tonic-gate dispq_t *dq; 20597c478bd9Sstevel@tonic-gate ulong_t *dqactmap = dp->disp_qactmap; 20607c478bd9Sstevel@tonic-gate ulong_t mapword; 20617c478bd9Sstevel@tonic-gate int wx; 20627c478bd9Sstevel@tonic-gate 20637c478bd9Sstevel@tonic-gate ASSERT(DISP_LOCK_HELD(&dp->disp_lock)); 20647c478bd9Sstevel@tonic-gate 20657c478bd9Sstevel@tonic-gate ASSERT(pri >= 0); /* checked by caller */ 20667c478bd9Sstevel@tonic-gate 20677c478bd9Sstevel@tonic-gate /* 20687c478bd9Sstevel@tonic-gate * Start the search at the next lowest priority below the supplied 20697c478bd9Sstevel@tonic-gate * priority. This depends on the bitmap implementation. 20707c478bd9Sstevel@tonic-gate */ 20717c478bd9Sstevel@tonic-gate do { 20727c478bd9Sstevel@tonic-gate wx = pri >> BT_ULSHIFT; /* index of word in map */ 20737c478bd9Sstevel@tonic-gate 20747c478bd9Sstevel@tonic-gate /* 20757c478bd9Sstevel@tonic-gate * Form mask for all lower priorities in the word. 20767c478bd9Sstevel@tonic-gate */ 20777c478bd9Sstevel@tonic-gate mapword = dqactmap[wx] & (BT_BIW(pri) - 1); 20787c478bd9Sstevel@tonic-gate 20797c478bd9Sstevel@tonic-gate /* 20807c478bd9Sstevel@tonic-gate * Get next lower active priority. 20817c478bd9Sstevel@tonic-gate */ 20827c478bd9Sstevel@tonic-gate if (mapword != 0) { 20837c478bd9Sstevel@tonic-gate pri = (wx << BT_ULSHIFT) + highbit(mapword) - 1; 20847c478bd9Sstevel@tonic-gate } else if (wx > 0) { 20857c478bd9Sstevel@tonic-gate pri = bt_gethighbit(dqactmap, wx - 1); /* sign extend */ 20867c478bd9Sstevel@tonic-gate if (pri < 0) 20877c478bd9Sstevel@tonic-gate break; 20887c478bd9Sstevel@tonic-gate } else { 20897c478bd9Sstevel@tonic-gate pri = -1; 20907c478bd9Sstevel@tonic-gate break; 20917c478bd9Sstevel@tonic-gate } 20927c478bd9Sstevel@tonic-gate 20937c478bd9Sstevel@tonic-gate /* 20947c478bd9Sstevel@tonic-gate * Search the queue for unbound, runnable threads. 20957c478bd9Sstevel@tonic-gate */ 20967c478bd9Sstevel@tonic-gate dq = &dp->disp_q[pri]; 20977c478bd9Sstevel@tonic-gate tp = dq->dq_first; 20987c478bd9Sstevel@tonic-gate 20997c478bd9Sstevel@tonic-gate while (tp && (tp->t_bound_cpu || tp->t_weakbound_cpu)) { 21007c478bd9Sstevel@tonic-gate tp = tp->t_link; 21017c478bd9Sstevel@tonic-gate } 21027c478bd9Sstevel@tonic-gate 21037c478bd9Sstevel@tonic-gate /* 21047c478bd9Sstevel@tonic-gate * If a thread was found, set the priority and return. 21057c478bd9Sstevel@tonic-gate */ 21067c478bd9Sstevel@tonic-gate } while (tp == NULL); 21077c478bd9Sstevel@tonic-gate 21087c478bd9Sstevel@tonic-gate /* 21097c478bd9Sstevel@tonic-gate * pri holds the maximum unbound thread priority or -1. 21107c478bd9Sstevel@tonic-gate */ 21117c478bd9Sstevel@tonic-gate if (dp->disp_max_unbound_pri != pri) 21127c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = pri; 21137c478bd9Sstevel@tonic-gate } 21147c478bd9Sstevel@tonic-gate 21157c478bd9Sstevel@tonic-gate /* 21167c478bd9Sstevel@tonic-gate * disp_adjust_unbound_pri() - thread is becoming unbound, so we should 21177c478bd9Sstevel@tonic-gate * check if the CPU to which is was previously bound should have 21187c478bd9Sstevel@tonic-gate * its disp_max_unbound_pri increased. 21197c478bd9Sstevel@tonic-gate */ 21207c478bd9Sstevel@tonic-gate void 21217c478bd9Sstevel@tonic-gate disp_adjust_unbound_pri(kthread_t *tp) 21227c478bd9Sstevel@tonic-gate { 21237c478bd9Sstevel@tonic-gate disp_t *dp; 21247c478bd9Sstevel@tonic-gate pri_t tpri; 21257c478bd9Sstevel@tonic-gate 21267c478bd9Sstevel@tonic-gate ASSERT(THREAD_LOCK_HELD(tp)); 21277c478bd9Sstevel@tonic-gate 21287c478bd9Sstevel@tonic-gate /* 21297c478bd9Sstevel@tonic-gate * Don't do anything if the thread is not bound, or 21307c478bd9Sstevel@tonic-gate * currently not runnable or swapped out. 21317c478bd9Sstevel@tonic-gate */ 21327c478bd9Sstevel@tonic-gate if (tp->t_bound_cpu == NULL || 21337c478bd9Sstevel@tonic-gate tp->t_state != TS_RUN || 21347c478bd9Sstevel@tonic-gate tp->t_schedflag & TS_ON_SWAPQ) 21357c478bd9Sstevel@tonic-gate return; 21367c478bd9Sstevel@tonic-gate 21377c478bd9Sstevel@tonic-gate tpri = DISP_PRIO(tp); 21387c478bd9Sstevel@tonic-gate dp = tp->t_bound_cpu->cpu_disp; 21397c478bd9Sstevel@tonic-gate ASSERT(tpri >= 0 && tpri < dp->disp_npri); 21407c478bd9Sstevel@tonic-gate if (tpri > dp->disp_max_unbound_pri) 21417c478bd9Sstevel@tonic-gate dp->disp_max_unbound_pri = tpri; 21427c478bd9Sstevel@tonic-gate } 21437c478bd9Sstevel@tonic-gate 21447c478bd9Sstevel@tonic-gate /* 2145685679f7Sakolb * disp_getbest() 2146685679f7Sakolb * De-queue the highest priority unbound runnable thread. 2147685679f7Sakolb * Returns with the thread unlocked and onproc but at splhigh (like disp()). 2148685679f7Sakolb * Returns NULL if nothing found. 2149685679f7Sakolb * Returns T_DONTSTEAL if the thread was not stealable. 2150685679f7Sakolb * so that the caller will try again later. 21517c478bd9Sstevel@tonic-gate * 2152685679f7Sakolb * Passed a pointer to a dispatch queue not associated with this CPU, and 2153685679f7Sakolb * its type. 21547c478bd9Sstevel@tonic-gate */ 21557c478bd9Sstevel@tonic-gate static kthread_t * 21567c478bd9Sstevel@tonic-gate disp_getbest(disp_t *dp) 21577c478bd9Sstevel@tonic-gate { 21587c478bd9Sstevel@tonic-gate kthread_t *tp; 21597c478bd9Sstevel@tonic-gate dispq_t *dq; 21607c478bd9Sstevel@tonic-gate pri_t pri; 2161685679f7Sakolb cpu_t *cp, *tcp; 2162685679f7Sakolb boolean_t allbound; 21637c478bd9Sstevel@tonic-gate 21647c478bd9Sstevel@tonic-gate disp_lock_enter(&dp->disp_lock); 21657c478bd9Sstevel@tonic-gate 21667c478bd9Sstevel@tonic-gate /* 21677c478bd9Sstevel@tonic-gate * If there is nothing to run, or the CPU is in the middle of a 21687c478bd9Sstevel@tonic-gate * context switch of the only thread, return NULL. 21697c478bd9Sstevel@tonic-gate */ 2170685679f7Sakolb tcp = dp->disp_cpu; 2171685679f7Sakolb cp = CPU; 21727c478bd9Sstevel@tonic-gate pri = dp->disp_max_unbound_pri; 21737c478bd9Sstevel@tonic-gate if (pri == -1 || 2174685679f7Sakolb (tcp != NULL && (tcp->cpu_disp_flags & CPU_DISP_DONTSTEAL) && 2175685679f7Sakolb tcp->cpu_disp->disp_nrunnable == 1)) { 21767c478bd9Sstevel@tonic-gate disp_lock_exit_nopreempt(&dp->disp_lock); 21777c478bd9Sstevel@tonic-gate return (NULL); 21787c478bd9Sstevel@tonic-gate } 21797c478bd9Sstevel@tonic-gate 21807c478bd9Sstevel@tonic-gate dq = &dp->disp_q[pri]; 2181685679f7Sakolb 21827c478bd9Sstevel@tonic-gate 21837c478bd9Sstevel@tonic-gate /* 2184685679f7Sakolb * Assume that all threads are bound on this queue, and change it 2185685679f7Sakolb * later when we find out that it is not the case. 21867c478bd9Sstevel@tonic-gate */ 2187685679f7Sakolb allbound = B_TRUE; 2188685679f7Sakolb for (tp = dq->dq_first; tp != NULL; tp = tp->t_link) { 2189685679f7Sakolb hrtime_t now, nosteal, rqtime; 2190685679f7Sakolb 2191685679f7Sakolb /* 2192685679f7Sakolb * Skip over bound threads which could be here even 2193685679f7Sakolb * though disp_max_unbound_pri indicated this level. 2194685679f7Sakolb */ 2195685679f7Sakolb if (tp->t_bound_cpu || tp->t_weakbound_cpu) 2196685679f7Sakolb continue; 2197685679f7Sakolb 2198685679f7Sakolb /* 2199685679f7Sakolb * We've got some unbound threads on this queue, so turn 2200685679f7Sakolb * the allbound flag off now. 2201685679f7Sakolb */ 2202685679f7Sakolb allbound = B_FALSE; 2203685679f7Sakolb 2204685679f7Sakolb /* 2205685679f7Sakolb * The thread is a candidate for stealing from its run queue. We 2206685679f7Sakolb * don't want to steal threads that became runnable just a 2207685679f7Sakolb * moment ago. This improves CPU affinity for threads that get 2208685679f7Sakolb * preempted for short periods of time and go back on the run 2209685679f7Sakolb * queue. 2210685679f7Sakolb * 2211685679f7Sakolb * We want to let it stay on its run queue if it was only placed 2212685679f7Sakolb * there recently and it was running on the same CPU before that 2213685679f7Sakolb * to preserve its cache investment. For the thread to remain on 2214685679f7Sakolb * its run queue, ALL of the following conditions must be 2215685679f7Sakolb * satisfied: 2216685679f7Sakolb * 2217685679f7Sakolb * - the disp queue should not be the kernel preemption queue 2218685679f7Sakolb * - delayed idle stealing should not be disabled 2219685679f7Sakolb * - nosteal_nsec should be non-zero 2220685679f7Sakolb * - it should run with user priority 2221685679f7Sakolb * - it should be on the run queue of the CPU where it was 2222685679f7Sakolb * running before being placed on the run queue 2223685679f7Sakolb * - it should be the only thread on the run queue (to prevent 2224685679f7Sakolb * extra scheduling latency for other threads) 2225685679f7Sakolb * - it should sit on the run queue for less than per-chip 2226685679f7Sakolb * nosteal interval or global nosteal interval 2227685679f7Sakolb * - in case of CPUs with shared cache it should sit in a run 2228685679f7Sakolb * queue of a CPU from a different chip 2229685679f7Sakolb * 2230685679f7Sakolb * The checks are arranged so that the ones that are faster are 2231685679f7Sakolb * placed earlier. 2232685679f7Sakolb */ 2233685679f7Sakolb if (tcp == NULL || 2234685679f7Sakolb pri >= minclsyspri || 2235685679f7Sakolb tp->t_cpu != tcp) 2236685679f7Sakolb break; 2237685679f7Sakolb 2238685679f7Sakolb /* 2239fb2f18f8Sesaxe * Steal immediately if, due to CMT processor architecture 2240fb2f18f8Sesaxe * migraiton between cp and tcp would incur no performance 2241fb2f18f8Sesaxe * penalty. 2242685679f7Sakolb */ 2243fb2f18f8Sesaxe if (pg_cmt_can_migrate(cp, tcp)) 2244685679f7Sakolb break; 2245685679f7Sakolb 2246fb2f18f8Sesaxe nosteal = nosteal_nsec; 2247fb2f18f8Sesaxe if (nosteal == 0) 2248685679f7Sakolb break; 2249685679f7Sakolb 2250685679f7Sakolb /* 2251685679f7Sakolb * Calculate time spent sitting on run queue 2252685679f7Sakolb */ 2253685679f7Sakolb now = gethrtime_unscaled(); 2254685679f7Sakolb rqtime = now - tp->t_waitrq; 2255685679f7Sakolb scalehrtime(&rqtime); 2256685679f7Sakolb 2257685679f7Sakolb /* 2258685679f7Sakolb * Steal immediately if the time spent on this run queue is more 2259685679f7Sakolb * than allowed nosteal delay. 2260685679f7Sakolb * 2261685679f7Sakolb * Negative rqtime check is needed here to avoid infinite 2262685679f7Sakolb * stealing delays caused by unlikely but not impossible 2263685679f7Sakolb * drifts between CPU times on different CPUs. 2264685679f7Sakolb */ 2265685679f7Sakolb if (rqtime > nosteal || rqtime < 0) 2266685679f7Sakolb break; 2267685679f7Sakolb 2268685679f7Sakolb DTRACE_PROBE4(nosteal, kthread_t *, tp, 2269685679f7Sakolb cpu_t *, tcp, cpu_t *, cp, hrtime_t, rqtime); 2270685679f7Sakolb scalehrtime(&now); 2271685679f7Sakolb /* 2272685679f7Sakolb * Calculate when this thread becomes stealable 2273685679f7Sakolb */ 2274685679f7Sakolb now += (nosteal - rqtime); 2275685679f7Sakolb 2276685679f7Sakolb /* 2277685679f7Sakolb * Calculate time when some thread becomes stealable 2278685679f7Sakolb */ 2279685679f7Sakolb if (now < dp->disp_steal) 2280685679f7Sakolb dp->disp_steal = now; 22817c478bd9Sstevel@tonic-gate } 22827c478bd9Sstevel@tonic-gate 22837c478bd9Sstevel@tonic-gate /* 22847c478bd9Sstevel@tonic-gate * If there were no unbound threads on this queue, find the queue 2285685679f7Sakolb * where they are and then return later. The value of 2286685679f7Sakolb * disp_max_unbound_pri is not always accurate because it isn't 2287685679f7Sakolb * reduced until another idle CPU looks for work. 22887c478bd9Sstevel@tonic-gate */ 2289685679f7Sakolb if (allbound) 22907c478bd9Sstevel@tonic-gate disp_fix_unbound_pri(dp, pri); 2291685679f7Sakolb 2292685679f7Sakolb /* 2293685679f7Sakolb * If we reached the end of the queue and found no unbound threads 2294685679f7Sakolb * then return NULL so that other CPUs will be considered. If there 2295685679f7Sakolb * are unbound threads but they cannot yet be stolen, then 2296685679f7Sakolb * return T_DONTSTEAL and try again later. 2297685679f7Sakolb */ 2298685679f7Sakolb if (tp == NULL) { 22997c478bd9Sstevel@tonic-gate disp_lock_exit_nopreempt(&dp->disp_lock); 2300685679f7Sakolb return (allbound ? NULL : T_DONTSTEAL); 23017c478bd9Sstevel@tonic-gate } 23027c478bd9Sstevel@tonic-gate 23037c478bd9Sstevel@tonic-gate /* 23047c478bd9Sstevel@tonic-gate * Found a runnable, unbound thread, so remove it from queue. 23057c478bd9Sstevel@tonic-gate * dispdeq() requires that we have the thread locked, and we do, 23067c478bd9Sstevel@tonic-gate * by virtue of holding the dispatch queue lock. dispdeq() will 23077c478bd9Sstevel@tonic-gate * put the thread in transition state, thereby dropping the dispq 23087c478bd9Sstevel@tonic-gate * lock. 23097c478bd9Sstevel@tonic-gate */ 2310685679f7Sakolb 23117c478bd9Sstevel@tonic-gate #ifdef DEBUG 23127c478bd9Sstevel@tonic-gate { 23137c478bd9Sstevel@tonic-gate int thread_was_on_queue; 23147c478bd9Sstevel@tonic-gate 23157c478bd9Sstevel@tonic-gate thread_was_on_queue = dispdeq(tp); /* drops disp_lock */ 23167c478bd9Sstevel@tonic-gate ASSERT(thread_was_on_queue); 23177c478bd9Sstevel@tonic-gate } 2318685679f7Sakolb 23197c478bd9Sstevel@tonic-gate #else /* DEBUG */ 23207c478bd9Sstevel@tonic-gate (void) dispdeq(tp); /* drops disp_lock */ 23217c478bd9Sstevel@tonic-gate #endif /* DEBUG */ 23227c478bd9Sstevel@tonic-gate 2323685679f7Sakolb /* 2324685679f7Sakolb * Reset the disp_queue steal time - we do not know what is the smallest 2325685679f7Sakolb * value across the queue is. 2326685679f7Sakolb */ 2327685679f7Sakolb dp->disp_steal = 0; 2328685679f7Sakolb 23297c478bd9Sstevel@tonic-gate tp->t_schedflag |= TS_DONT_SWAP; 23307c478bd9Sstevel@tonic-gate 23317c478bd9Sstevel@tonic-gate /* 23327c478bd9Sstevel@tonic-gate * Setup thread to run on the current CPU. 23337c478bd9Sstevel@tonic-gate */ 23347c478bd9Sstevel@tonic-gate tp->t_disp_queue = cp->cpu_disp; 23357c478bd9Sstevel@tonic-gate 23367c478bd9Sstevel@tonic-gate cp->cpu_dispthread = tp; /* protected by spl only */ 23377c478bd9Sstevel@tonic-gate cp->cpu_dispatch_pri = pri; 23380f500aa6Sbpramod 23390f500aa6Sbpramod /* 23400f500aa6Sbpramod * There can be a memory synchronization race between disp_getbest() 23410f500aa6Sbpramod * and disp_ratify() vs cpu_resched() where cpu_resched() is trying 23420f500aa6Sbpramod * to preempt the current thread to run the enqueued thread while 23430f500aa6Sbpramod * disp_getbest() and disp_ratify() are changing the current thread 23440f500aa6Sbpramod * to the stolen thread. This may lead to a situation where 23450f500aa6Sbpramod * cpu_resched() tries to preempt the wrong thread and the 23460f500aa6Sbpramod * stolen thread continues to run on the CPU which has been tagged 23470f500aa6Sbpramod * for preemption. 23480f500aa6Sbpramod * Later the clock thread gets enqueued but doesn't get to run on the 23490f500aa6Sbpramod * CPU causing the system to hang. 23500f500aa6Sbpramod * 23510f500aa6Sbpramod * To avoid this, grabbing and dropping the disp_lock (which does 23520f500aa6Sbpramod * a memory barrier) is needed to synchronize the execution of 23530f500aa6Sbpramod * cpu_resched() with disp_getbest() and disp_ratify() and 23540f500aa6Sbpramod * synchronize the memory read and written by cpu_resched(), 23550f500aa6Sbpramod * disp_getbest(), and disp_ratify() with each other. 23560f500aa6Sbpramod * (see CR#6482861 for more details). 23570f500aa6Sbpramod */ 23580f500aa6Sbpramod disp_lock_enter_high(&cp->cpu_disp->disp_lock); 23590f500aa6Sbpramod disp_lock_exit_high(&cp->cpu_disp->disp_lock); 23600f500aa6Sbpramod 23617c478bd9Sstevel@tonic-gate ASSERT(pri == DISP_PRIO(tp)); 23627c478bd9Sstevel@tonic-gate 2363685679f7Sakolb DTRACE_PROBE3(steal, kthread_t *, tp, cpu_t *, tcp, cpu_t *, cp); 2364685679f7Sakolb 23657c478bd9Sstevel@tonic-gate thread_onproc(tp, cp); /* set t_state to TS_ONPROC */ 23667c478bd9Sstevel@tonic-gate 23677c478bd9Sstevel@tonic-gate /* 23687c478bd9Sstevel@tonic-gate * Return with spl high so that swtch() won't need to raise it. 23697c478bd9Sstevel@tonic-gate * The disp_lock was dropped by dispdeq(). 23707c478bd9Sstevel@tonic-gate */ 23717c478bd9Sstevel@tonic-gate 23727c478bd9Sstevel@tonic-gate return (tp); 23737c478bd9Sstevel@tonic-gate } 23747c478bd9Sstevel@tonic-gate 23757c478bd9Sstevel@tonic-gate /* 23767c478bd9Sstevel@tonic-gate * disp_bound_common() - common routine for higher level functions 23777c478bd9Sstevel@tonic-gate * that check for bound threads under certain conditions. 23787c478bd9Sstevel@tonic-gate * If 'threadlistsafe' is set then there is no need to acquire 23797c478bd9Sstevel@tonic-gate * pidlock to stop the thread list from changing (eg, if 23807c478bd9Sstevel@tonic-gate * disp_bound_* is called with cpus paused). 23817c478bd9Sstevel@tonic-gate */ 23827c478bd9Sstevel@tonic-gate static int 23837c478bd9Sstevel@tonic-gate disp_bound_common(cpu_t *cp, int threadlistsafe, int flag) 23847c478bd9Sstevel@tonic-gate { 23857c478bd9Sstevel@tonic-gate int found = 0; 23867c478bd9Sstevel@tonic-gate kthread_t *tp; 23877c478bd9Sstevel@tonic-gate 23887c478bd9Sstevel@tonic-gate ASSERT(flag); 23897c478bd9Sstevel@tonic-gate 23907c478bd9Sstevel@tonic-gate if (!threadlistsafe) 23917c478bd9Sstevel@tonic-gate mutex_enter(&pidlock); 23927c478bd9Sstevel@tonic-gate tp = curthread; /* faster than allthreads */ 23937c478bd9Sstevel@tonic-gate do { 23947c478bd9Sstevel@tonic-gate if (tp->t_state != TS_FREE) { 23957c478bd9Sstevel@tonic-gate /* 23967c478bd9Sstevel@tonic-gate * If an interrupt thread is busy, but the 23977c478bd9Sstevel@tonic-gate * caller doesn't care (i.e. BOUND_INTR is off), 23987c478bd9Sstevel@tonic-gate * then just ignore it and continue through. 23997c478bd9Sstevel@tonic-gate */ 24007c478bd9Sstevel@tonic-gate if ((tp->t_flag & T_INTR_THREAD) && 24017c478bd9Sstevel@tonic-gate !(flag & BOUND_INTR)) 24027c478bd9Sstevel@tonic-gate continue; 24037c478bd9Sstevel@tonic-gate 24047c478bd9Sstevel@tonic-gate /* 24057c478bd9Sstevel@tonic-gate * Skip the idle thread for the CPU 24067c478bd9Sstevel@tonic-gate * we're about to set offline. 24077c478bd9Sstevel@tonic-gate */ 24087c478bd9Sstevel@tonic-gate if (tp == cp->cpu_idle_thread) 24097c478bd9Sstevel@tonic-gate continue; 24107c478bd9Sstevel@tonic-gate 24117c478bd9Sstevel@tonic-gate /* 24127c478bd9Sstevel@tonic-gate * Skip the pause thread for the CPU 24137c478bd9Sstevel@tonic-gate * we're about to set offline. 24147c478bd9Sstevel@tonic-gate */ 24157c478bd9Sstevel@tonic-gate if (tp == cp->cpu_pause_thread) 24167c478bd9Sstevel@tonic-gate continue; 24177c478bd9Sstevel@tonic-gate 24187c478bd9Sstevel@tonic-gate if ((flag & BOUND_CPU) && 24197c478bd9Sstevel@tonic-gate (tp->t_bound_cpu == cp || 24207c478bd9Sstevel@tonic-gate tp->t_bind_cpu == cp->cpu_id || 24217c478bd9Sstevel@tonic-gate tp->t_weakbound_cpu == cp)) { 24227c478bd9Sstevel@tonic-gate found = 1; 24237c478bd9Sstevel@tonic-gate break; 24247c478bd9Sstevel@tonic-gate } 24257c478bd9Sstevel@tonic-gate 24267c478bd9Sstevel@tonic-gate if ((flag & BOUND_PARTITION) && 24277c478bd9Sstevel@tonic-gate (tp->t_cpupart == cp->cpu_part)) { 24287c478bd9Sstevel@tonic-gate found = 1; 24297c478bd9Sstevel@tonic-gate break; 24307c478bd9Sstevel@tonic-gate } 24317c478bd9Sstevel@tonic-gate } 24327c478bd9Sstevel@tonic-gate } while ((tp = tp->t_next) != curthread && found == 0); 24337c478bd9Sstevel@tonic-gate if (!threadlistsafe) 24347c478bd9Sstevel@tonic-gate mutex_exit(&pidlock); 24357c478bd9Sstevel@tonic-gate return (found); 24367c478bd9Sstevel@tonic-gate } 24377c478bd9Sstevel@tonic-gate 24387c478bd9Sstevel@tonic-gate /* 24397c478bd9Sstevel@tonic-gate * disp_bound_threads - return nonzero if threads are bound to the processor. 24407c478bd9Sstevel@tonic-gate * Called infrequently. Keep this simple. 24417c478bd9Sstevel@tonic-gate * Includes threads that are asleep or stopped but not onproc. 24427c478bd9Sstevel@tonic-gate */ 24437c478bd9Sstevel@tonic-gate int 24447c478bd9Sstevel@tonic-gate disp_bound_threads(cpu_t *cp, int threadlistsafe) 24457c478bd9Sstevel@tonic-gate { 24467c478bd9Sstevel@tonic-gate return (disp_bound_common(cp, threadlistsafe, BOUND_CPU)); 24477c478bd9Sstevel@tonic-gate } 24487c478bd9Sstevel@tonic-gate 24497c478bd9Sstevel@tonic-gate /* 24507c478bd9Sstevel@tonic-gate * disp_bound_anythreads - return nonzero if _any_ threads are bound 24517c478bd9Sstevel@tonic-gate * to the given processor, including interrupt threads. 24527c478bd9Sstevel@tonic-gate */ 24537c478bd9Sstevel@tonic-gate int 24547c478bd9Sstevel@tonic-gate disp_bound_anythreads(cpu_t *cp, int threadlistsafe) 24557c478bd9Sstevel@tonic-gate { 24567c478bd9Sstevel@tonic-gate return (disp_bound_common(cp, threadlistsafe, BOUND_CPU | BOUND_INTR)); 24577c478bd9Sstevel@tonic-gate } 24587c478bd9Sstevel@tonic-gate 24597c478bd9Sstevel@tonic-gate /* 24607c478bd9Sstevel@tonic-gate * disp_bound_partition - return nonzero if threads are bound to the same 24617c478bd9Sstevel@tonic-gate * partition as the processor. 24627c478bd9Sstevel@tonic-gate * Called infrequently. Keep this simple. 24637c478bd9Sstevel@tonic-gate * Includes threads that are asleep or stopped but not onproc. 24647c478bd9Sstevel@tonic-gate */ 24657c478bd9Sstevel@tonic-gate int 24667c478bd9Sstevel@tonic-gate disp_bound_partition(cpu_t *cp, int threadlistsafe) 24677c478bd9Sstevel@tonic-gate { 24687c478bd9Sstevel@tonic-gate return (disp_bound_common(cp, threadlistsafe, BOUND_PARTITION)); 24697c478bd9Sstevel@tonic-gate } 24707c478bd9Sstevel@tonic-gate 24717c478bd9Sstevel@tonic-gate /* 24727c478bd9Sstevel@tonic-gate * disp_cpu_inactive - make a CPU inactive by moving all of its unbound 24737c478bd9Sstevel@tonic-gate * threads to other CPUs. 24747c478bd9Sstevel@tonic-gate */ 24757c478bd9Sstevel@tonic-gate void 24767c478bd9Sstevel@tonic-gate disp_cpu_inactive(cpu_t *cp) 24777c478bd9Sstevel@tonic-gate { 24787c478bd9Sstevel@tonic-gate kthread_t *tp; 24797c478bd9Sstevel@tonic-gate disp_t *dp = cp->cpu_disp; 24807c478bd9Sstevel@tonic-gate dispq_t *dq; 24817c478bd9Sstevel@tonic-gate pri_t pri; 24827c478bd9Sstevel@tonic-gate int wasonq; 24837c478bd9Sstevel@tonic-gate 24847c478bd9Sstevel@tonic-gate disp_lock_enter(&dp->disp_lock); 24857c478bd9Sstevel@tonic-gate while ((pri = dp->disp_max_unbound_pri) != -1) { 24867c478bd9Sstevel@tonic-gate dq = &dp->disp_q[pri]; 24877c478bd9Sstevel@tonic-gate tp = dq->dq_first; 24887c478bd9Sstevel@tonic-gate 24897c478bd9Sstevel@tonic-gate /* 24907c478bd9Sstevel@tonic-gate * Skip over bound threads. 24917c478bd9Sstevel@tonic-gate */ 24927c478bd9Sstevel@tonic-gate while (tp != NULL && tp->t_bound_cpu != NULL) { 24937c478bd9Sstevel@tonic-gate tp = tp->t_link; 24947c478bd9Sstevel@tonic-gate } 24957c478bd9Sstevel@tonic-gate 24967c478bd9Sstevel@tonic-gate if (tp == NULL) { 24977c478bd9Sstevel@tonic-gate /* disp_max_unbound_pri must be inaccurate, so fix it */ 24987c478bd9Sstevel@tonic-gate disp_fix_unbound_pri(dp, pri); 24997c478bd9Sstevel@tonic-gate continue; 25007c478bd9Sstevel@tonic-gate } 25017c478bd9Sstevel@tonic-gate 25027c478bd9Sstevel@tonic-gate wasonq = dispdeq(tp); /* drops disp_lock */ 25037c478bd9Sstevel@tonic-gate ASSERT(wasonq); 25047c478bd9Sstevel@tonic-gate ASSERT(tp->t_weakbound_cpu == NULL); 25057c478bd9Sstevel@tonic-gate 25067c478bd9Sstevel@tonic-gate setbackdq(tp); 25077c478bd9Sstevel@tonic-gate /* 25087c478bd9Sstevel@tonic-gate * Called from cpu_offline: 25097c478bd9Sstevel@tonic-gate * 25107c478bd9Sstevel@tonic-gate * cp has already been removed from the list of active cpus 25117c478bd9Sstevel@tonic-gate * and tp->t_cpu has been changed so there is no risk of 25127c478bd9Sstevel@tonic-gate * tp ending up back on cp. 25137c478bd9Sstevel@tonic-gate * 25147c478bd9Sstevel@tonic-gate * Called from cpupart_move_cpu: 25157c478bd9Sstevel@tonic-gate * 25167c478bd9Sstevel@tonic-gate * The cpu has moved to a new cpupart. Any threads that 25177c478bd9Sstevel@tonic-gate * were on it's dispatch queues before the move remain 25187c478bd9Sstevel@tonic-gate * in the old partition and can't run in the new partition. 25197c478bd9Sstevel@tonic-gate */ 25207c478bd9Sstevel@tonic-gate ASSERT(tp->t_cpu != cp); 25217c478bd9Sstevel@tonic-gate thread_unlock(tp); 25227c478bd9Sstevel@tonic-gate 25237c478bd9Sstevel@tonic-gate disp_lock_enter(&dp->disp_lock); 25247c478bd9Sstevel@tonic-gate } 25257c478bd9Sstevel@tonic-gate disp_lock_exit(&dp->disp_lock); 25267c478bd9Sstevel@tonic-gate } 25277c478bd9Sstevel@tonic-gate 25287c478bd9Sstevel@tonic-gate /* 25297c478bd9Sstevel@tonic-gate * disp_lowpri_cpu - find CPU running the lowest priority thread. 25307c478bd9Sstevel@tonic-gate * The hint passed in is used as a starting point so we don't favor 25317c478bd9Sstevel@tonic-gate * CPU 0 or any other CPU. The caller should pass in the most recently 25327c478bd9Sstevel@tonic-gate * used CPU for the thread. 25337c478bd9Sstevel@tonic-gate * 25347c478bd9Sstevel@tonic-gate * The lgroup and priority are used to determine the best CPU to run on 25357c478bd9Sstevel@tonic-gate * in a NUMA machine. The lgroup specifies which CPUs are closest while 25367c478bd9Sstevel@tonic-gate * the thread priority will indicate whether the thread will actually run 25377c478bd9Sstevel@tonic-gate * there. To pick the best CPU, the CPUs inside and outside of the given 25387c478bd9Sstevel@tonic-gate * lgroup which are running the lowest priority threads are found. The 25397c478bd9Sstevel@tonic-gate * remote CPU is chosen only if the thread will not run locally on a CPU 25407c478bd9Sstevel@tonic-gate * within the lgroup, but will run on the remote CPU. If the thread 25417c478bd9Sstevel@tonic-gate * cannot immediately run on any CPU, the best local CPU will be chosen. 25427c478bd9Sstevel@tonic-gate * 25437c478bd9Sstevel@tonic-gate * The lpl specified also identifies the cpu partition from which 25447c478bd9Sstevel@tonic-gate * disp_lowpri_cpu should select a CPU. 25457c478bd9Sstevel@tonic-gate * 25467c478bd9Sstevel@tonic-gate * curcpu is used to indicate that disp_lowpri_cpu is being called on 25477c478bd9Sstevel@tonic-gate * behalf of the current thread. (curthread is looking for a new cpu) 25487c478bd9Sstevel@tonic-gate * In this case, cpu_dispatch_pri for this thread's cpu should be 25497c478bd9Sstevel@tonic-gate * ignored. 25507c478bd9Sstevel@tonic-gate * 25517c478bd9Sstevel@tonic-gate * If a cpu is the target of an offline request then try to avoid it. 25527c478bd9Sstevel@tonic-gate * 25537c478bd9Sstevel@tonic-gate * This function must be called at either high SPL, or with preemption 25547c478bd9Sstevel@tonic-gate * disabled, so that the "hint" CPU cannot be removed from the online 25557c478bd9Sstevel@tonic-gate * CPU list while we are traversing it. 25567c478bd9Sstevel@tonic-gate */ 25577c478bd9Sstevel@tonic-gate cpu_t * 25587c478bd9Sstevel@tonic-gate disp_lowpri_cpu(cpu_t *hint, lpl_t *lpl, pri_t tpri, cpu_t *curcpu) 25597c478bd9Sstevel@tonic-gate { 25607c478bd9Sstevel@tonic-gate cpu_t *bestcpu; 25617c478bd9Sstevel@tonic-gate cpu_t *besthomecpu; 25627c478bd9Sstevel@tonic-gate cpu_t *cp, *cpstart; 25637c478bd9Sstevel@tonic-gate 25647c478bd9Sstevel@tonic-gate pri_t bestpri; 25657c478bd9Sstevel@tonic-gate pri_t cpupri; 25667c478bd9Sstevel@tonic-gate 25677c478bd9Sstevel@tonic-gate klgrpset_t done; 25687c478bd9Sstevel@tonic-gate klgrpset_t cur_set; 25697c478bd9Sstevel@tonic-gate 25707c478bd9Sstevel@tonic-gate lpl_t *lpl_iter, *lpl_leaf; 25717c478bd9Sstevel@tonic-gate int i; 25727c478bd9Sstevel@tonic-gate 25737c478bd9Sstevel@tonic-gate /* 25747c478bd9Sstevel@tonic-gate * Scan for a CPU currently running the lowest priority thread. 25757c478bd9Sstevel@tonic-gate * Cannot get cpu_lock here because it is adaptive. 25767c478bd9Sstevel@tonic-gate * We do not require lock on CPU list. 25777c478bd9Sstevel@tonic-gate */ 25787c478bd9Sstevel@tonic-gate ASSERT(hint != NULL); 25797c478bd9Sstevel@tonic-gate ASSERT(lpl != NULL); 25807c478bd9Sstevel@tonic-gate ASSERT(lpl->lpl_ncpu > 0); 25817c478bd9Sstevel@tonic-gate 25827c478bd9Sstevel@tonic-gate /* 25837c478bd9Sstevel@tonic-gate * First examine local CPUs. Note that it's possible the hint CPU 25847c478bd9Sstevel@tonic-gate * passed in in remote to the specified home lgroup. If our priority 25857c478bd9Sstevel@tonic-gate * isn't sufficient enough such that we can run immediately at home, 25867c478bd9Sstevel@tonic-gate * then examine CPUs remote to our home lgroup. 25877c478bd9Sstevel@tonic-gate * We would like to give preference to CPUs closest to "home". 25887c478bd9Sstevel@tonic-gate * If we can't find a CPU where we'll run at a given level 25897c478bd9Sstevel@tonic-gate * of locality, we expand our search to include the next level. 25907c478bd9Sstevel@tonic-gate */ 25917c478bd9Sstevel@tonic-gate bestcpu = besthomecpu = NULL; 25927c478bd9Sstevel@tonic-gate klgrpset_clear(done); 25937c478bd9Sstevel@tonic-gate /* start with lpl we were passed */ 25947c478bd9Sstevel@tonic-gate 25957c478bd9Sstevel@tonic-gate lpl_iter = lpl; 25967c478bd9Sstevel@tonic-gate 25977c478bd9Sstevel@tonic-gate do { 25987c478bd9Sstevel@tonic-gate 25997c478bd9Sstevel@tonic-gate bestpri = SHRT_MAX; 26007c478bd9Sstevel@tonic-gate klgrpset_clear(cur_set); 26017c478bd9Sstevel@tonic-gate 26027c478bd9Sstevel@tonic-gate for (i = 0; i < lpl_iter->lpl_nrset; i++) { 26037c478bd9Sstevel@tonic-gate lpl_leaf = lpl_iter->lpl_rset[i]; 26047c478bd9Sstevel@tonic-gate if (klgrpset_ismember(done, lpl_leaf->lpl_lgrpid)) 26057c478bd9Sstevel@tonic-gate continue; 26067c478bd9Sstevel@tonic-gate 26077c478bd9Sstevel@tonic-gate klgrpset_add(cur_set, lpl_leaf->lpl_lgrpid); 26087c478bd9Sstevel@tonic-gate 26097c478bd9Sstevel@tonic-gate if (hint->cpu_lpl == lpl_leaf) 26107c478bd9Sstevel@tonic-gate cp = cpstart = hint; 26117c478bd9Sstevel@tonic-gate else 26127c478bd9Sstevel@tonic-gate cp = cpstart = lpl_leaf->lpl_cpus; 26137c478bd9Sstevel@tonic-gate 26147c478bd9Sstevel@tonic-gate do { 26157c478bd9Sstevel@tonic-gate if (cp == curcpu) 26167c478bd9Sstevel@tonic-gate cpupri = -1; 26177c478bd9Sstevel@tonic-gate else if (cp == cpu_inmotion) 26187c478bd9Sstevel@tonic-gate cpupri = SHRT_MAX; 26197c478bd9Sstevel@tonic-gate else 26207c478bd9Sstevel@tonic-gate cpupri = cp->cpu_dispatch_pri; 26217c478bd9Sstevel@tonic-gate if (cp->cpu_disp->disp_maxrunpri > cpupri) 26227c478bd9Sstevel@tonic-gate cpupri = cp->cpu_disp->disp_maxrunpri; 26237c478bd9Sstevel@tonic-gate if (cp->cpu_chosen_level > cpupri) 26247c478bd9Sstevel@tonic-gate cpupri = cp->cpu_chosen_level; 26257c478bd9Sstevel@tonic-gate if (cpupri < bestpri) { 26267c478bd9Sstevel@tonic-gate if (CPU_IDLING(cpupri)) { 26277c478bd9Sstevel@tonic-gate ASSERT((cp->cpu_flags & 26287c478bd9Sstevel@tonic-gate CPU_QUIESCED) == 0); 26297c478bd9Sstevel@tonic-gate return (cp); 26307c478bd9Sstevel@tonic-gate } 26317c478bd9Sstevel@tonic-gate bestcpu = cp; 26327c478bd9Sstevel@tonic-gate bestpri = cpupri; 26337c478bd9Sstevel@tonic-gate } 26347c478bd9Sstevel@tonic-gate } while ((cp = cp->cpu_next_lpl) != cpstart); 26357c478bd9Sstevel@tonic-gate } 26367c478bd9Sstevel@tonic-gate 26377c478bd9Sstevel@tonic-gate if (bestcpu && (tpri > bestpri)) { 26387c478bd9Sstevel@tonic-gate ASSERT((bestcpu->cpu_flags & CPU_QUIESCED) == 0); 26397c478bd9Sstevel@tonic-gate return (bestcpu); 26407c478bd9Sstevel@tonic-gate } 26417c478bd9Sstevel@tonic-gate if (besthomecpu == NULL) 26427c478bd9Sstevel@tonic-gate besthomecpu = bestcpu; 26437c478bd9Sstevel@tonic-gate /* 26447c478bd9Sstevel@tonic-gate * Add the lgrps we just considered to the "done" set 26457c478bd9Sstevel@tonic-gate */ 26467c478bd9Sstevel@tonic-gate klgrpset_or(done, cur_set); 26477c478bd9Sstevel@tonic-gate 26487c478bd9Sstevel@tonic-gate } while ((lpl_iter = lpl_iter->lpl_parent) != NULL); 26497c478bd9Sstevel@tonic-gate 26507c478bd9Sstevel@tonic-gate /* 26517c478bd9Sstevel@tonic-gate * The specified priority isn't high enough to run immediately 26527c478bd9Sstevel@tonic-gate * anywhere, so just return the best CPU from the home lgroup. 26537c478bd9Sstevel@tonic-gate */ 26547c478bd9Sstevel@tonic-gate ASSERT((besthomecpu->cpu_flags & CPU_QUIESCED) == 0); 26557c478bd9Sstevel@tonic-gate return (besthomecpu); 26567c478bd9Sstevel@tonic-gate } 26577c478bd9Sstevel@tonic-gate 26587c478bd9Sstevel@tonic-gate /* 26597c478bd9Sstevel@tonic-gate * This routine provides the generic idle cpu function for all processors. 26607c478bd9Sstevel@tonic-gate * If a processor has some specific code to execute when idle (say, to stop 26617c478bd9Sstevel@tonic-gate * the pipeline and save power) then that routine should be defined in the 26627c478bd9Sstevel@tonic-gate * processors specific code (module_xx.c) and the global variable idle_cpu 26637c478bd9Sstevel@tonic-gate * set to that function. 26647c478bd9Sstevel@tonic-gate */ 26657c478bd9Sstevel@tonic-gate static void 26667c478bd9Sstevel@tonic-gate generic_idle_cpu(void) 26677c478bd9Sstevel@tonic-gate { 26687c478bd9Sstevel@tonic-gate } 26697c478bd9Sstevel@tonic-gate 26707c478bd9Sstevel@tonic-gate /*ARGSUSED*/ 26717c478bd9Sstevel@tonic-gate static void 26727c478bd9Sstevel@tonic-gate generic_enq_thread(cpu_t *cpu, int bound) 26737c478bd9Sstevel@tonic-gate { 26747c478bd9Sstevel@tonic-gate } 2675