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: stable/10/sys/vm/vm_meter.c 311049 2017-01-02 08:31:29Z kib $"); 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> 42248084Sattilio#include <sys/rwlock.h> 4374927Sjhb#include <sys/sx.h> 4412662Sdg#include <sys/vmmeter.h> 4593823Sdillon#include <sys/smp.h> 4612662Sdg 471541Srgrimes#include <vm/vm.h> 4840794Speter#include <vm/vm_page.h> 4912726Sbde#include <vm/vm_extern.h> 5012662Sdg#include <vm/vm_param.h> 5112662Sdg#include <vm/pmap.h> 5212662Sdg#include <vm/vm_map.h> 5312662Sdg#include <vm/vm_object.h> 541541Srgrimes#include <sys/sysctl.h> 551541Srgrimes 56170170Sattiliostruct vmmeter cnt; 571541Srgrimes 5862622SjhbSYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 59228449Seadler CTLFLAG_RW, &cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 6062622SjhbSYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 61228449Seadler CTLFLAG_RW, &cnt.v_free_target, 0, "Desired free pages"); 6262622SjhbSYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 63228449Seadler CTLFLAG_RW, &cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 6462622SjhbSYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 65228449Seadler CTLFLAG_RW, &cnt.v_inactive_target, 0, "Pages desired inactive"); 6662622SjhbSYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min, 67228449Seadler CTLFLAG_RW, &cnt.v_cache_min, 0, "Min pages on cache queue"); 6862622SjhbSYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 69228449Seadler CTLFLAG_RW, &cnt.v_cache_max, 0, "Max pages on cache queue"); 7062622SjhbSYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 71228449Seadler CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 7262622SjhbSYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 73228449Seadler CTLFLAG_RW, &cnt.v_free_severe, 0, "Severe page depletion point"); 7412286Sphk 75136404Speterstatic int 76136404Spetersysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 77136404Speter{ 78181887Sjulian 79136404Speter#ifdef SCTL_MASK32 80136404Speter u_int32_t la[4]; 811541Srgrimes 82136404Speter if (req->flags & SCTL_MASK32) { 83136404Speter la[0] = averunnable.ldavg[0]; 84136404Speter la[1] = averunnable.ldavg[1]; 85136404Speter la[2] = averunnable.ldavg[2]; 86136404Speter la[3] = averunnable.fscale; 87136404Speter return SYSCTL_OUT(req, la, sizeof(la)); 88136404Speter } else 89136404Speter#endif 90136404Speter return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 91136404Speter} 92187658SjhbSYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 93187658Sjhb CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 94187658Sjhb "Machine loadaverage history"); 95136404Speter 96302243Skib/* 97302243Skib * This function aims to determine if the object is mapped, 98302243Skib * specifically, if it is referenced by a vm_map_entry. Because 99302243Skib * objects occasionally acquire transient references that do not 100302243Skib * represent a mapping, the method used here is inexact. However, it 101302243Skib * has very low overhead and is good enough for the advisory 102302243Skib * vm.vmtotal sysctl. 103302243Skib */ 104302243Skibstatic bool 105302243Skibis_object_active(vm_object_t obj) 106302243Skib{ 107302243Skib 108302243Skib return (obj->ref_count > obj->shadow_count); 109302243Skib} 110302243Skib 11112286Sphkstatic int 11262573Sphkvmtotal(SYSCTL_HANDLER_ARGS) 1131541Srgrimes{ 114164437Sru struct vmtotal total; 11512286Sphk vm_object_t object; 116302243Skib struct proc *p; 11799072Sjulian struct thread *td; 1181541Srgrimes 119164437Sru bzero(&total, sizeof(total)); 120302243Skib 1211541Srgrimes /* 1221541Srgrimes * Calculate process statistics. 1231541Srgrimes */ 12474927Sjhb sx_slock(&allproc_lock); 12583366Sjulian FOREACH_PROC_IN_SYSTEM(p) { 126311049Skib if ((p->p_flag & P_SYSTEM) != 0) 1271541Srgrimes continue; 128177368Sjeff PROC_LOCK(p); 129311049Skib if (p->p_state != PRS_NEW) { 13099072Sjulian FOREACH_THREAD_IN_PROC(p, td) { 131170307Sjeff thread_lock(td); 13299072Sjulian switch (td->td_state) { 133103216Sjulian case TDS_INHIBITED: 134177085Sjeff if (TD_IS_SWAPPED(td)) 135164437Sru total.t_sw++; 136302243Skib else if (TD_IS_SLEEPING(td)) { 137302243Skib if (td->td_priority <= PZERO) 138302243Skib total.t_dw++; 139302243Skib else 140302243Skib total.t_sl++; 141302243Skib if (td->td_wchan == 142302243Skib &cnt.v_free_count) 143302243Skib total.t_pw++; 144302243Skib } 14599072Sjulian break; 146103216Sjulian case TDS_CAN_RUN: 147164437Sru total.t_sw++; 148103216Sjulian break; 14999072Sjulian case TDS_RUNQ: 15099072Sjulian case TDS_RUNNING: 151164437Sru total.t_rq++; 152311049Skib break; 15399072Sjulian default: 15499072Sjulian break; 15599072Sjulian } 156170307Sjeff thread_unlock(td); 15771572Sjhb } 1581541Srgrimes } 159177368Sjeff PROC_UNLOCK(p); 1601541Srgrimes } 16174927Sjhb sx_sunlock(&allproc_lock); 1621541Srgrimes /* 1631541Srgrimes * Calculate object memory usage statistics. 1641541Srgrimes */ 16595112Salc mtx_lock(&vm_object_list_mtx); 16675523Salfred TAILQ_FOREACH(object, &vm_object_list, object_list) { 16742957Sdillon /* 168284100Sjhb * Perform unsynchronized reads on the object. In 169284100Sjhb * this case, the lack of synchronization should not 170284100Sjhb * impair the accuracy of the reported statistics. 17142957Sdillon */ 172244043Salc if ((object->flags & OBJ_FICTITIOUS) != 0) { 173124083Salc /* 174124083Salc * Devices, like /dev/mem, will badly skew our totals. 175124083Salc */ 17642957Sdillon continue; 177108585Salc } 178164429Sru if (object->ref_count == 0) { 179164429Sru /* 180164429Sru * Also skip unreferenced objects, including 181164429Sru * vnodes representing mounted file systems. 182164429Sru */ 183164429Sru continue; 184164429Sru } 185302243Skib if (object->ref_count == 1 && 186302243Skib (object->flags & OBJ_NOSPLIT) != 0) { 187302243Skib /* 188302243Skib * Also skip otherwise unreferenced swap 189302243Skib * objects backing tmpfs vnodes, and POSIX or 190302243Skib * SysV shared memory. 191302243Skib */ 192302243Skib continue; 193302243Skib } 194164437Sru total.t_vm += object->size; 195164437Sru total.t_rm += object->resident_page_count; 196302243Skib if (is_object_active(object)) { 197164437Sru total.t_avm += object->size; 198164437Sru total.t_arm += object->resident_page_count; 1991541Srgrimes } 20018169Sdyson if (object->shadow_count > 1) { 2011541Srgrimes /* shared object */ 202164437Sru total.t_vmshr += object->size; 203164437Sru total.t_rmshr += object->resident_page_count; 204302243Skib if (is_object_active(object)) { 205164437Sru total.t_avmshr += object->size; 206164437Sru total.t_armshr += object->resident_page_count; 2071541Srgrimes } 2081541Srgrimes } 2091541Srgrimes } 21095112Salc mtx_unlock(&vm_object_list_mtx); 211170170Sattilio total.t_free = cnt.v_free_count + cnt.v_cache_count; 212164437Sru return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 2131541Srgrimes} 21412286Sphk 21593823Sdillon/* 21693823Sdillon * vcnt() - accumulate statistics from all cpus and the global cnt 21793823Sdillon * structure. 21893823Sdillon * 21993823Sdillon * The vmmeter structure is now per-cpu as well as global. Those 22093823Sdillon * statistics which can be kept on a per-cpu basis (to avoid cache 22193823Sdillon * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 22293823Sdillon * statistics, such as v_free_reserved, are left in the global 22393823Sdillon * structure. 22493823Sdillon * 22593823Sdillon * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 22693823Sdillon */ 22793823Sdillonstatic int 22893823Sdillonvcnt(SYSCTL_HANDLER_ARGS) 22993823Sdillon{ 23093823Sdillon int count = *(int *)arg1; 231170170Sattilio int offset = (char *)arg1 - (char *)&cnt; 23293823Sdillon int i; 23393823Sdillon 234218592Sjmallett CPU_FOREACH(i) { 23593823Sdillon struct pcpu *pcpu = pcpu_find(i); 23693823Sdillon count += *(int *)((char *)&pcpu->pc_cnt + offset); 23793823Sdillon } 238144970Sjhb return (SYSCTL_OUT(req, &count, sizeof(int))); 23993823Sdillon} 24093823Sdillon 241187658SjhbSYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 24246381Sbillf 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 24346381Sbillf "System virtual memory statistics"); 244141696SphkSYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 245141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 246141630Sphk "VM meter sys stats"); 247141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 248141630Sphk "VM meter vm stats"); 24940794SpeterSYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 25093823Sdillon 251228498Seadler#define VM_STATS(parent, var, descr) \ 252228498Seadler SYSCTL_PROC(parent, OID_AUTO, var, \ 253228498Seadler CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &cnt.var, 0, vcnt, \ 254228498Seadler "IU", descr) 255228498Seadler#define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 256228498Seadler#define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 25793823Sdillon 258228449SeadlerVM_STATS_SYS(v_swtch, "Context switches"); 259228449SeadlerVM_STATS_SYS(v_trap, "Traps"); 260228449SeadlerVM_STATS_SYS(v_syscall, "System calls"); 261228449SeadlerVM_STATS_SYS(v_intr, "Device interrupts"); 262228449SeadlerVM_STATS_SYS(v_soft, "Software interrupts"); 263228498SeadlerVM_STATS_VM(v_vm_faults, "Address memory faults"); 264246032SzontVM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 265228498SeadlerVM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 266228498SeadlerVM_STATS_VM(v_cow_optim, "Optimized COW faults"); 267228498SeadlerVM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 268228498SeadlerVM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 269228498SeadlerVM_STATS_VM(v_swapin, "Swap pager pageins"); 270228498SeadlerVM_STATS_VM(v_swapout, "Swap pager pageouts"); 271228498SeadlerVM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 272228498SeadlerVM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 273228498SeadlerVM_STATS_VM(v_vnodein, "Vnode pager pageins"); 274228498SeadlerVM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 275228498SeadlerVM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 276228498SeadlerVM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 277228498SeadlerVM_STATS_VM(v_intrans, "In transit page faults"); 278228498SeadlerVM_STATS_VM(v_reactivated, "Pages reactivated from free list"); 279228498SeadlerVM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 280228498SeadlerVM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 281228498SeadlerVM_STATS_VM(v_tcached, "Total pages cached"); 282228498SeadlerVM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 283228498SeadlerVM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 284228498SeadlerVM_STATS_VM(v_tfree, "Total pages freed"); 285228498SeadlerVM_STATS_VM(v_page_size, "Page size in bytes"); 286228498SeadlerVM_STATS_VM(v_page_count, "Total number of pages in system"); 287228498SeadlerVM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 288228498SeadlerVM_STATS_VM(v_free_target, "Pages desired free"); 289228498SeadlerVM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 290228498SeadlerVM_STATS_VM(v_free_count, "Free pages"); 291228498SeadlerVM_STATS_VM(v_wire_count, "Wired pages"); 292228498SeadlerVM_STATS_VM(v_active_count, "Active pages"); 293228498SeadlerVM_STATS_VM(v_inactive_target, "Desired inactive pages"); 294228498SeadlerVM_STATS_VM(v_inactive_count, "Inactive pages"); 295228498SeadlerVM_STATS_VM(v_cache_count, "Pages on cache queue"); 296228498SeadlerVM_STATS_VM(v_cache_min, "Min pages on cache queue"); 297228498SeadlerVM_STATS_VM(v_cache_max, "Max pages on cached queue"); 298228498SeadlerVM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 299228498SeadlerVM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 300228498SeadlerVM_STATS_VM(v_forks, "Number of fork() calls"); 301228498SeadlerVM_STATS_VM(v_vforks, "Number of vfork() calls"); 302228498SeadlerVM_STATS_VM(v_rforks, "Number of rfork() calls"); 303228498SeadlerVM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 304228498SeadlerVM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 305228498SeadlerVM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 306228498SeadlerVM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 307228498SeadlerVM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 308228449Seadler 309228449SeadlerSYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 310228449Seadler &vm_page_zero_count, 0, "Number of zero-ed free pages"); 311