vm_meter.c revision 181887
1/*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/vm/vm_meter.c 181887 2008-08-20 01:05:56Z julian $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/kernel.h> 38#include <sys/lock.h> 39#include <sys/mutex.h> 40#include <sys/proc.h> 41#include <sys/resource.h> 42#include <sys/sx.h> 43#include <sys/vmmeter.h> 44#include <sys/smp.h> 45 46#include <vm/vm.h> 47#include <vm/vm_page.h> 48#include <vm/vm_extern.h> 49#include <vm/vm_param.h> 50#include <vm/pmap.h> 51#include <vm/vm_map.h> 52#include <vm/vm_object.h> 53#include <sys/sysctl.h> 54 55struct vmmeter cnt; 56 57int maxslp = MAXSLP; 58 59SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 60 CTLFLAG_RW, &cnt.v_free_min, 0, ""); 61SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 62 CTLFLAG_RW, &cnt.v_free_target, 0, ""); 63SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 64 CTLFLAG_RW, &cnt.v_free_reserved, 0, ""); 65SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 66 CTLFLAG_RW, &cnt.v_inactive_target, 0, ""); 67SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 68 CTLFLAG_RW, &cnt.v_cache_min, 0, ""); 69SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 70 CTLFLAG_RW, &cnt.v_cache_max, 0, ""); 71SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 72 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, ""); 73SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 74 CTLFLAG_RW, &cnt.v_free_severe, 0, ""); 75 76static int 77sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 78{ 79 80#ifdef SCTL_MASK32 81 u_int32_t la[4]; 82 83 if (req->flags & SCTL_MASK32) { 84 la[0] = averunnable.ldavg[0]; 85 la[1] = averunnable.ldavg[1]; 86 la[2] = averunnable.ldavg[2]; 87 la[3] = averunnable.fscale; 88 return SYSCTL_OUT(req, la, sizeof(la)); 89 } else 90#endif 91 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 92} 93SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT|CTLFLAG_RD, 94 NULL, 0, sysctl_vm_loadavg, "S,loadavg", "Machine loadaverage history"); 95 96static int 97vmtotal(SYSCTL_HANDLER_ARGS) 98{ 99 struct proc *p; 100 struct vmtotal total; 101 vm_map_entry_t entry; 102 vm_object_t object; 103 vm_map_t map; 104 int paging; 105 struct thread *td; 106 struct vmspace *vm; 107 108 bzero(&total, sizeof(total)); 109 /* 110 * Mark all objects as inactive. 111 */ 112 GIANT_REQUIRED; 113 mtx_lock(&vm_object_list_mtx); 114 TAILQ_FOREACH(object, &vm_object_list, object_list) { 115 if (!VM_OBJECT_TRYLOCK(object)) { 116 /* 117 * Avoid a lock-order reversal. Consequently, 118 * the reported number of active pages may be 119 * greater than the actual number. 120 */ 121 continue; 122 } 123 vm_object_clear_flag(object, OBJ_ACTIVE); 124 VM_OBJECT_UNLOCK(object); 125 } 126 mtx_unlock(&vm_object_list_mtx); 127 /* 128 * Calculate process statistics. 129 */ 130 sx_slock(&allproc_lock); 131 FOREACH_PROC_IN_SYSTEM(p) { 132 if (p->p_flag & P_SYSTEM) 133 continue; 134 PROC_LOCK(p); 135 PROC_SLOCK(p); 136 switch (p->p_state) { 137 case PRS_NEW: 138 PROC_SUNLOCK(p); 139 PROC_UNLOCK(p); 140 continue; 141 break; 142 default: 143 PROC_SUNLOCK(p); 144 FOREACH_THREAD_IN_PROC(p, td) { 145 thread_lock(td); 146 switch (td->td_state) { 147 case TDS_INHIBITED: 148 if (TD_IS_SWAPPED(td)) 149 total.t_sw++; 150 else if (TD_IS_SLEEPING(td) && 151 td->td_priority <= PZERO) 152 total.t_dw++; 153 else 154 total.t_sl++; 155 break; 156 157 case TDS_CAN_RUN: 158 total.t_sw++; 159 break; 160 case TDS_RUNQ: 161 case TDS_RUNNING: 162 total.t_rq++; 163 thread_unlock(td); 164 continue; 165 default: 166 break; 167 } 168 thread_unlock(td); 169 } 170 } 171 PROC_UNLOCK(p); 172 /* 173 * Note active objects. 174 */ 175 paging = 0; 176 vm = vmspace_acquire_ref(p); 177 if (vm == NULL) 178 continue; 179 map = &vm->vm_map; 180 vm_map_lock_read(map); 181 for (entry = map->header.next; 182 entry != &map->header; entry = entry->next) { 183 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 184 (object = entry->object.vm_object) == NULL) 185 continue; 186 VM_OBJECT_LOCK(object); 187 vm_object_set_flag(object, OBJ_ACTIVE); 188 paging |= object->paging_in_progress; 189 VM_OBJECT_UNLOCK(object); 190 } 191 vm_map_unlock_read(map); 192 vmspace_free(vm); 193 if (paging) 194 total.t_pw++; 195 } 196 sx_sunlock(&allproc_lock); 197 /* 198 * Calculate object memory usage statistics. 199 */ 200 mtx_lock(&vm_object_list_mtx); 201 TAILQ_FOREACH(object, &vm_object_list, object_list) { 202 /* 203 * Perform unsynchronized reads on the object to avoid 204 * a lock-order reversal. In this case, the lack of 205 * synchronization should not impair the accuracy of 206 * the reported statistics. 207 */ 208 if (object->type == OBJT_DEVICE) { 209 /* 210 * Devices, like /dev/mem, will badly skew our totals. 211 */ 212 continue; 213 } 214 if (object->ref_count == 0) { 215 /* 216 * Also skip unreferenced objects, including 217 * vnodes representing mounted file systems. 218 */ 219 continue; 220 } 221 total.t_vm += object->size; 222 total.t_rm += object->resident_page_count; 223 if (object->flags & OBJ_ACTIVE) { 224 total.t_avm += object->size; 225 total.t_arm += object->resident_page_count; 226 } 227 if (object->shadow_count > 1) { 228 /* shared object */ 229 total.t_vmshr += object->size; 230 total.t_rmshr += object->resident_page_count; 231 if (object->flags & OBJ_ACTIVE) { 232 total.t_avmshr += object->size; 233 total.t_armshr += object->resident_page_count; 234 } 235 } 236 } 237 mtx_unlock(&vm_object_list_mtx); 238 total.t_free = cnt.v_free_count + cnt.v_cache_count; 239 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 240} 241 242/* 243 * vcnt() - accumulate statistics from all cpus and the global cnt 244 * structure. 245 * 246 * The vmmeter structure is now per-cpu as well as global. Those 247 * statistics which can be kept on a per-cpu basis (to avoid cache 248 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 249 * statistics, such as v_free_reserved, are left in the global 250 * structure. 251 * 252 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 253 */ 254static int 255vcnt(SYSCTL_HANDLER_ARGS) 256{ 257 int count = *(int *)arg1; 258 int offset = (char *)arg1 - (char *)&cnt; 259#ifdef SMP 260 int i; 261 262 for (i = 0; i < mp_ncpus; ++i) { 263 struct pcpu *pcpu = pcpu_find(i); 264 count += *(int *)((char *)&pcpu->pc_cnt + offset); 265 } 266#else 267 count += *(int *)((char *)PCPU_PTR(cnt) + offset); 268#endif 269 return (SYSCTL_OUT(req, &count, sizeof(int))); 270} 271 272SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD, 273 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 274 "System virtual memory statistics"); 275SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 276static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 277 "VM meter sys stats"); 278static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 279 "VM meter vm stats"); 280SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 281 282SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD, 283 &cnt.v_swtch, 0, vcnt, "IU", "Context switches"); 284SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD, 285 &cnt.v_trap, 0, vcnt, "IU", "Traps"); 286SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD, 287 &cnt.v_syscall, 0, vcnt, "IU", "Syscalls"); 288SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD, 289 &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts"); 290SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD, 291 &cnt.v_soft, 0, vcnt, "IU", "Software interrupts"); 292SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD, 293 &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults"); 294SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD, 295 &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults"); 296SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD, 297 &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults"); 298SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD, 299 &cnt.v_zfod, 0, vcnt, "IU", "Zero fill"); 300SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD, 301 &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill"); 302SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD, 303 &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations"); 304SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD, 305 &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations"); 306SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD, 307 &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages"); 308SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD, 309 &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages"); 310SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD, 311 &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations"); 312SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD, 313 &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations"); 314SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD, 315 &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages"); 316SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD, 317 &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages"); 318SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD, 319 &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking"); 320SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD, 321 &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages"); 322SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD, 323 &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups"); 324SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD, 325 &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans"); 326SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tcached, CTLTYPE_UINT|CTLFLAG_RD, 327 &cnt.v_tcached, 0, vcnt, "IU", "Total pages cached"); 328SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD, 329 &cnt.v_dfree, 0, vcnt, "IU", ""); 330SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD, 331 &cnt.v_pfree, 0, vcnt, "IU", ""); 332SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD, 333 &cnt.v_tfree, 0, vcnt, "IU", ""); 334SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD, 335 &cnt.v_page_size, 0, vcnt, "IU", ""); 336SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD, 337 &cnt.v_page_count, 0, vcnt, "IU", ""); 338SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD, 339 &cnt.v_free_reserved, 0, vcnt, "IU", ""); 340SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD, 341 &cnt.v_free_target, 0, vcnt, "IU", ""); 342SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD, 343 &cnt.v_free_min, 0, vcnt, "IU", ""); 344SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD, 345 &cnt.v_free_count, 0, vcnt, "IU", ""); 346SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD, 347 &cnt.v_wire_count, 0, vcnt, "IU", ""); 348SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD, 349 &cnt.v_active_count, 0, vcnt, "IU", ""); 350SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD, 351 &cnt.v_inactive_target, 0, vcnt, "IU", ""); 352SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD, 353 &cnt.v_inactive_count, 0, vcnt, "IU", ""); 354SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD, 355 &cnt.v_cache_count, 0, vcnt, "IU", ""); 356SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD, 357 &cnt.v_cache_min, 0, vcnt, "IU", ""); 358SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD, 359 &cnt.v_cache_max, 0, vcnt, "IU", ""); 360SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD, 361 &cnt.v_pageout_free_min, 0, vcnt, "IU", ""); 362SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD, 363 &cnt.v_interrupt_free_min, 0, vcnt, "IU", ""); 364SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD, 365 &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls"); 366SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD, 367 &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls"); 368SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD, 369 &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls"); 370SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD, 371 &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel"); 372SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD, 373 &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()"); 374SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD, 375 &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()"); 376SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD, 377 &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()"); 378SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD, 379 &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel"); 380 381SYSCTL_INT(_vm_stats_misc, OID_AUTO, 382 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, ""); 383