1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include "c_synonyms.h" 30 #include "umem_base.h" 31 #include "vmem_base.h" 32 33 #include <signal.h> 34 35 /*ARGSUSED*/ 36 static void * 37 umem_update_thread(void *arg) 38 { 39 struct timeval now; 40 int in_update = 0; 41 42 (void) mutex_lock(&umem_update_lock); 43 44 ASSERT(umem_update_thr == thr_self()); 45 ASSERT(umem_st_update_thr == 0); 46 47 for (;;) { 48 umem_process_updates(); 49 50 if (in_update) { 51 in_update = 0; 52 /* 53 * we wait until now to set the next update time 54 * so that the updates are self-throttling 55 */ 56 (void) gettimeofday(&umem_update_next, NULL); 57 umem_update_next.tv_sec += umem_reap_interval; 58 } 59 60 switch (umem_reaping) { 61 case UMEM_REAP_DONE: 62 case UMEM_REAP_ADDING: 63 break; 64 65 case UMEM_REAP_ACTIVE: 66 umem_reap_next = gethrtime() + 67 (hrtime_t)umem_reap_interval * NANOSEC; 68 umem_reaping = UMEM_REAP_DONE; 69 break; 70 71 default: 72 ASSERT(umem_reaping == UMEM_REAP_DONE || 73 umem_reaping == UMEM_REAP_ADDING || 74 umem_reaping == UMEM_REAP_ACTIVE); 75 break; 76 } 77 78 (void) gettimeofday(&now, NULL); 79 if (now.tv_sec > umem_update_next.tv_sec || 80 (now.tv_sec == umem_update_next.tv_sec && 81 now.tv_usec >= umem_update_next.tv_usec)) { 82 /* 83 * Time to run an update 84 */ 85 (void) mutex_unlock(&umem_update_lock); 86 87 vmem_update(NULL); 88 /* 89 * umem_cache_update can use umem_add_update to 90 * request further work. The update is not complete 91 * until all such work is finished. 92 */ 93 umem_cache_applyall(umem_cache_update); 94 95 (void) mutex_lock(&umem_update_lock); 96 in_update = 1; 97 continue; /* start processing immediately */ 98 } 99 100 /* 101 * if there is no work to do, we wait until it is time for 102 * next update, or someone wakes us. 103 */ 104 if (umem_null_cache.cache_unext == &umem_null_cache) { 105 int cancel_state; 106 timespec_t abs_time; 107 abs_time.tv_sec = umem_update_next.tv_sec; 108 abs_time.tv_nsec = umem_update_next.tv_usec * 1000; 109 110 (void) pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 111 &cancel_state); 112 (void) cond_timedwait(&umem_update_cv, 113 &umem_update_lock, &abs_time); 114 (void) pthread_setcancelstate(cancel_state, NULL); 115 } 116 } 117 /* LINTED no return statement */ 118 } 119 120 int 121 umem_create_update_thread(void) 122 { 123 sigset_t sigmask, oldmask; 124 thread_t newthread; 125 126 ASSERT(MUTEX_HELD(&umem_update_lock)); 127 ASSERT(umem_update_thr == 0); 128 129 /* 130 * The update thread handles no signals 131 */ 132 (void) sigfillset(&sigmask); 133 (void) thr_sigsetmask(SIG_BLOCK, &sigmask, &oldmask); 134 135 /* 136 * drop the umem_update_lock; we cannot hold locks acquired in 137 * pre-fork handler while calling thr_create or thr_continue(). 138 */ 139 140 (void) mutex_unlock(&umem_update_lock); 141 142 if (thr_create(NULL, NULL, umem_update_thread, NULL, 143 THR_BOUND | THR_DAEMON | THR_DETACHED | THR_SUSPENDED, 144 &newthread) == 0) { 145 (void) thr_sigsetmask(SIG_SETMASK, &oldmask, NULL); 146 147 (void) mutex_lock(&umem_update_lock); 148 /* 149 * due to the locking in umem_reap(), only one thread can 150 * ever call umem_create_update_thread() at a time. This 151 * must be the case for this code to work. 152 */ 153 154 ASSERT(umem_update_thr == 0); 155 umem_update_thr = newthread; 156 (void) mutex_unlock(&umem_update_lock); 157 (void) thr_continue(newthread); 158 (void) mutex_lock(&umem_update_lock); 159 160 return (1); 161 } else { /* thr_create failed */ 162 (void) thr_sigsetmask(SIG_SETMASK, &oldmask, NULL); 163 (void) mutex_lock(&umem_update_lock); 164 } 165 return (0); 166 } 167