vm_meter.c revision 228449
1139825Simp/*- 21541Srgrimes * Copyright (c) 1982, 1986, 1989, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 4. Neither the name of the University nor the names of its contributors 141541Srgrimes * may be used to endorse or promote products derived from this software 151541Srgrimes * without specific prior written permission. 161541Srgrimes * 171541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271541Srgrimes * SUCH DAMAGE. 281541Srgrimes * 291541Srgrimes * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94 301541Srgrimes */ 311541Srgrimes 32116226Sobrien#include <sys/cdefs.h> 33116226Sobrien__FBSDID("$FreeBSD: head/sys/vm/vm_meter.c 228449 2011-12-13 00:38:50Z eadler $"); 34116226Sobrien 351541Srgrimes#include <sys/param.h> 361541Srgrimes#include <sys/systm.h> 371541Srgrimes#include <sys/kernel.h> 3876166Smarkm#include <sys/lock.h> 3976166Smarkm#include <sys/mutex.h> 4076166Smarkm#include <sys/proc.h> 4134924Sbde#include <sys/resource.h> 4274927Sjhb#include <sys/sx.h> 4312662Sdg#include <sys/vmmeter.h> 4493823Sdillon#include <sys/smp.h> 4512662Sdg 461541Srgrimes#include <vm/vm.h> 4740794Speter#include <vm/vm_page.h> 4812726Sbde#include <vm/vm_extern.h> 4912662Sdg#include <vm/vm_param.h> 5012662Sdg#include <vm/pmap.h> 5112662Sdg#include <vm/vm_map.h> 5212662Sdg#include <vm/vm_object.h> 531541Srgrimes#include <sys/sysctl.h> 541541Srgrimes 55170170Sattiliostruct vmmeter cnt; 561541Srgrimes 5762622SjhbSYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 58228449Seadler CTLFLAG_RW, &cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 5962622SjhbSYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 60228449Seadler CTLFLAG_RW, &cnt.v_free_target, 0, "Desired free pages"); 6162622SjhbSYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 62228449Seadler CTLFLAG_RW, &cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 6362622SjhbSYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 64228449Seadler CTLFLAG_RW, &cnt.v_inactive_target, 0, "Pages desired inactive"); 6562622SjhbSYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 66228449Seadler CTLFLAG_RW, &cnt.v_cache_min, 0, "Min pages on cache queue"); 6762622SjhbSYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 68228449Seadler CTLFLAG_RW, &cnt.v_cache_max, 0, "Max pages on cache queue"); 6962622SjhbSYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 70228449Seadler CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 7162622SjhbSYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 72228449Seadler CTLFLAG_RW, &cnt.v_free_severe, 0, "Severe page depletion point"); 7312286Sphk 74136404Speterstatic int 75136404Spetersysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 76136404Speter{ 77181887Sjulian 78136404Speter#ifdef SCTL_MASK32 79136404Speter u_int32_t la[4]; 801541Srgrimes 81136404Speter if (req->flags & SCTL_MASK32) { 82136404Speter la[0] = averunnable.ldavg[0]; 83136404Speter la[1] = averunnable.ldavg[1]; 84136404Speter la[2] = averunnable.ldavg[2]; 85136404Speter la[3] = averunnable.fscale; 86136404Speter return SYSCTL_OUT(req, la, sizeof(la)); 87136404Speter } else 88136404Speter#endif 89136404Speter return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 90136404Speter} 91187658SjhbSYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 92187658Sjhb CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 93187658Sjhb "Machine loadaverage history"); 94136404Speter 9512286Sphkstatic int 9662573Sphkvmtotal(SYSCTL_HANDLER_ARGS) 971541Srgrimes{ 9812286Sphk struct proc *p; 99164437Sru struct vmtotal total; 10012286Sphk vm_map_entry_t entry; 10112286Sphk vm_object_t object; 10212286Sphk vm_map_t map; 1031541Srgrimes int paging; 10499072Sjulian struct thread *td; 105159054Stegge struct vmspace *vm; 1061541Srgrimes 107164437Sru bzero(&total, sizeof(total)); 1081541Srgrimes /* 1091541Srgrimes * Mark all objects as inactive. 1101541Srgrimes */ 11195112Salc mtx_lock(&vm_object_list_mtx); 112108551Salc TAILQ_FOREACH(object, &vm_object_list, object_list) { 113124083Salc if (!VM_OBJECT_TRYLOCK(object)) { 114124083Salc /* 115124083Salc * Avoid a lock-order reversal. Consequently, 116124083Salc * the reported number of active pages may be 117124083Salc * greater than the actual number. 118124083Salc */ 119124083Salc continue; 120124083Salc } 12138517Sdfr vm_object_clear_flag(object, OBJ_ACTIVE); 122113448Salc VM_OBJECT_UNLOCK(object); 123108551Salc } 12495112Salc mtx_unlock(&vm_object_list_mtx); 1251541Srgrimes /* 1261541Srgrimes * Calculate process statistics. 1271541Srgrimes */ 12874927Sjhb sx_slock(&allproc_lock); 12983366Sjulian FOREACH_PROC_IN_SYSTEM(p) { 1301541Srgrimes if (p->p_flag & P_SYSTEM) 1311541Srgrimes continue; 132177368Sjeff PROC_LOCK(p); 13399072Sjulian switch (p->p_state) { 13499072Sjulian case PRS_NEW: 135177368Sjeff PROC_UNLOCK(p); 1361541Srgrimes continue; 1371541Srgrimes break; 13899072Sjulian default: 13999072Sjulian FOREACH_THREAD_IN_PROC(p, td) { 140170307Sjeff thread_lock(td); 14199072Sjulian switch (td->td_state) { 142103216Sjulian case TDS_INHIBITED: 143177085Sjeff if (TD_IS_SWAPPED(td)) 144164437Sru total.t_sw++; 145177085Sjeff else if (TD_IS_SLEEPING(td) && 146177085Sjeff td->td_priority <= PZERO) 147177085Sjeff total.t_dw++; 148177085Sjeff else 149177085Sjeff total.t_sl++; 15099072Sjulian break; 1511541Srgrimes 152103216Sjulian case TDS_CAN_RUN: 153164437Sru total.t_sw++; 154103216Sjulian break; 15599072Sjulian case TDS_RUNQ: 15699072Sjulian case TDS_RUNNING: 157164437Sru total.t_rq++; 158170307Sjeff thread_unlock(td); 15999072Sjulian continue; 16099072Sjulian default: 16199072Sjulian break; 16299072Sjulian } 163170307Sjeff thread_unlock(td); 16471572Sjhb } 1651541Srgrimes } 166177368Sjeff PROC_UNLOCK(p); 1671541Srgrimes /* 1681541Srgrimes * Note active objects. 1691541Srgrimes */ 1701541Srgrimes paging = 0; 171159054Stegge vm = vmspace_acquire_ref(p); 172159054Stegge if (vm == NULL) 173159054Stegge continue; 174159054Stegge map = &vm->vm_map; 175108585Salc vm_map_lock_read(map); 176108585Salc for (entry = map->header.next; 1775455Sdg entry != &map->header; entry = entry->next) { 17843748Sdillon if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 179108585Salc (object = entry->object.vm_object) == NULL) 1801541Srgrimes continue; 181113448Salc VM_OBJECT_LOCK(object); 182108585Salc vm_object_set_flag(object, OBJ_ACTIVE); 183108585Salc paging |= object->paging_in_progress; 184113448Salc VM_OBJECT_UNLOCK(object); 1851541Srgrimes } 186108585Salc vm_map_unlock_read(map); 187159054Stegge vmspace_free(vm); 1881541Srgrimes if (paging) 189164437Sru total.t_pw++; 1901541Srgrimes } 19174927Sjhb sx_sunlock(&allproc_lock); 1921541Srgrimes /* 1931541Srgrimes * Calculate object memory usage statistics. 1941541Srgrimes */ 19595112Salc mtx_lock(&vm_object_list_mtx); 19675523Salfred TAILQ_FOREACH(object, &vm_object_list, object_list) { 19742957Sdillon /* 198124083Salc * Perform unsynchronized reads on the object to avoid 199124083Salc * a lock-order reversal. In this case, the lack of 200124083Salc * synchronization should not impair the accuracy of 201124083Salc * the reported statistics. 20242957Sdillon */ 203195840Sjhb if (object->type == OBJT_DEVICE || object->type == OBJT_SG) { 204124083Salc /* 205124083Salc * Devices, like /dev/mem, will badly skew our totals. 206124083Salc */ 20742957Sdillon continue; 208108585Salc } 209164429Sru if (object->ref_count == 0) { 210164429Sru /* 211164429Sru * Also skip unreferenced objects, including 212164429Sru * vnodes representing mounted file systems. 213164429Sru */ 214164429Sru continue; 215164429Sru } 216164437Sru total.t_vm += object->size; 217164437Sru total.t_rm += object->resident_page_count; 2181541Srgrimes if (object->flags & OBJ_ACTIVE) { 219164437Sru total.t_avm += object->size; 220164437Sru total.t_arm += object->resident_page_count; 2211541Srgrimes } 22218169Sdyson if (object->shadow_count > 1) { 2231541Srgrimes /* shared object */ 224164437Sru total.t_vmshr += object->size; 225164437Sru total.t_rmshr += object->resident_page_count; 2261541Srgrimes if (object->flags & OBJ_ACTIVE) { 227164437Sru total.t_avmshr += object->size; 228164437Sru total.t_armshr += object->resident_page_count; 2291541Srgrimes } 2301541Srgrimes } 2311541Srgrimes } 23295112Salc mtx_unlock(&vm_object_list_mtx); 233170170Sattilio total.t_free = cnt.v_free_count + cnt.v_cache_count; 234164437Sru return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 2351541Srgrimes} 23612286Sphk 23793823Sdillon/* 23893823Sdillon * vcnt() - accumulate statistics from all cpus and the global cnt 23993823Sdillon * structure. 24093823Sdillon * 24193823Sdillon * The vmmeter structure is now per-cpu as well as global. Those 24293823Sdillon * statistics which can be kept on a per-cpu basis (to avoid cache 24393823Sdillon * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 24493823Sdillon * statistics, such as v_free_reserved, are left in the global 24593823Sdillon * structure. 24693823Sdillon * 24793823Sdillon * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 24893823Sdillon */ 24993823Sdillonstatic int 25093823Sdillonvcnt(SYSCTL_HANDLER_ARGS) 25193823Sdillon{ 25293823Sdillon int count = *(int *)arg1; 253170170Sattilio int offset = (char *)arg1 - (char *)&cnt; 25493823Sdillon int i; 25593823Sdillon 256218592Sjmallett CPU_FOREACH(i) { 25793823Sdillon struct pcpu *pcpu = pcpu_find(i); 25893823Sdillon count += *(int *)((char *)&pcpu->pc_cnt + offset); 25993823Sdillon } 260144970Sjhb return (SYSCTL_OUT(req, &count, sizeof(int))); 26193823Sdillon} 26293823Sdillon 263187658SjhbSYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 26446381Sbillf 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 26546381Sbillf "System virtual memory statistics"); 266141696SphkSYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 267141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 268141630Sphk "VM meter sys stats"); 269141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 270141630Sphk "VM meter vm stats"); 27140794SpeterSYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 27293823Sdillon 273228449Seadler#define VM_STATS_SYS(var, descr) SYSCTL_PROC(_vm_stats_sys, OID_AUTO, var, \ 274228449Seadler (CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE), &cnt.v_swtch, 0, vcnt, \ 275228449Seadler "IU", descr); 27693823Sdillon 277228449SeadlerVM_STATS_SYS(v_swtch, "Context switches"); 278228449SeadlerVM_STATS_SYS(v_trap, "Traps"); 279228449SeadlerVM_STATS_SYS(v_syscall, "System calls"); 280228449SeadlerVM_STATS_SYS(v_intr, "Device interrupts"); 281228449SeadlerVM_STATS_SYS(v_soft, "Software interrupts"); 282228449SeadlerVM_STATS_SYS(v_vm_faults, "Address memory faults"); 283228449SeadlerVM_STATS_SYS(v_cow_faults, "Copy-on-write faults"); 284228449SeadlerVM_STATS_SYS(v_cow_optim, "Optimized COW faults") 285228449SeadlerVM_STATS_SYS(v_zfod, "Pages zero-filled on demand") 286228449SeadlerVM_STATS_SYS(v_ozfod, "Optimized zero fill pages") 287228449SeadlerVM_STATS_SYS(v_swapin, "Swap pager pageins") 288228449SeadlerVM_STATS_SYS(v_swapout, "Swap pager pageouts") 289228449SeadlerVM_STATS_SYS(v_swappgsin, "Swap pages swapped in") 290228449SeadlerVM_STATS_SYS(v_swappgsout, "Swap pages swapped out") 291228449SeadlerVM_STATS_SYS(v_vnodein, "Vnode pager pageins") 292228449SeadlerVM_STATS_SYS(v_vnodeout, "Vnode pager pageouts") 293228449SeadlerVM_STATS_SYS(v_vnodepgsin, "Vnode pages paged in") 294228449SeadlerVM_STATS_SYS(v_vnodepgsout, "Vnode pages paged out") 295228449SeadlerVM_STATS_SYS(v_intrans, "In transit page faults") 296228449SeadlerVM_STATS_SYS(v_reactivated, "Pages reactivated from free list") 297228449SeadlerVM_STATS_SYS(v_pdwakeups, "Pagedaemon wakeups") 298228449SeadlerVM_STATS_SYS(v_pdpages, "Pages analyzed by pagedaemon") 299228449SeadlerVM_STATS_SYS(v_tcached, "Total pages cached") 300228449SeadlerVM_STATS_SYS(v_dfree, "Pages freed by pagedaemon") 301228449SeadlerVM_STATS_SYS(v_pfree, "Pages freed by exiting processes") 302228449SeadlerVM_STATS_SYS(v_tfree, "Total pages freed") 303228449SeadlerVM_STATS_SYS(v_page_size, "Page size in bytes") 304228449SeadlerVM_STATS_SYS(v_page_count, "Total number of pages in system") 305228449SeadlerVM_STATS_SYS(v_free_reserved, "Pages reserved for deadlock") 306228449SeadlerVM_STATS_SYS(v_free_target, "Pages desired free") 307228449SeadlerVM_STATS_SYS(v_free_min, "Minimum low-free-pages threshold") 308228449SeadlerVM_STATS_SYS(v_free_count, "Free pages") 309228449SeadlerVM_STATS_SYS(v_wire_count, "Wired pages") 310228449SeadlerVM_STATS_SYS(v_active_count, "Active pages") 311228449SeadlerVM_STATS_SYS(v_inactive_target, "Desired inactive pages") 312228449SeadlerVM_STATS_SYS(v_inactive_count, "Inactive pages") 313228449SeadlerVM_STATS_SYS(v_cache_count, "Pages on cache queue") 314228449SeadlerVM_STATS_SYS(v_cache_min, "Min pages on cache queue") 315228449SeadlerVM_STATS_SYS(v_cache_max, "Max pages on cached queue") 316228449SeadlerVM_STATS_SYS(v_pageout_free_min, "Min pages reserved for kernel") 317228449SeadlerVM_STATS_SYS(v_interrupt_free_min, "Reserved pages for interrupt code") 318228449SeadlerVM_STATS_SYS(v_forks, "Number of fork() calls") 319228449SeadlerVM_STATS_SYS(v_vforks, "Number of vfork() calls") 320228449SeadlerVM_STATS_SYS(v_rforks, "Number of rfork() calls") 321228449SeadlerVM_STATS_SYS(v_kthreads, "Number of fork() calls by kernel") 322228449SeadlerVM_STATS_SYS(v_forkpages, "VM pages affected by fork()") 323228449SeadlerVM_STATS_SYS(v_vforkpages, "VM pages affected by vfork()") 324228449SeadlerVM_STATS_SYS(v_rforkpages, "VM pages affected by rfork()") 325228449SeadlerVM_STATS_SYS(v_kthreadpages, "VM pages affected by fork() by kernel") 326228449Seadler 327228449SeadlerSYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 328228449Seadler &vm_page_zero_count, 0, "Number of zero-ed free pages"); 329