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: releng/11.0/sys/vm/vm_meter.c 302063 2016-06-21 17:49:33Z 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 56263620Sbdrewerystruct vmmeter vm_cnt; 571541Srgrimes 5862622SjhbSYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 59263620Sbdrewery CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 6062622SjhbSYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 61263620Sbdrewery CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages"); 6262622SjhbSYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 63263620Sbdrewery CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 6462622SjhbSYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 65263620Sbdrewery CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive"); 6662622SjhbSYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 67263620Sbdrewery CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 6862622SjhbSYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 69263620Sbdrewery CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point"); 7012286Sphk 71136404Speterstatic int 72136404Spetersysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 73136404Speter{ 74181887Sjulian 75136404Speter#ifdef SCTL_MASK32 76136404Speter u_int32_t la[4]; 771541Srgrimes 78136404Speter if (req->flags & SCTL_MASK32) { 79136404Speter la[0] = averunnable.ldavg[0]; 80136404Speter la[1] = averunnable.ldavg[1]; 81136404Speter la[2] = averunnable.ldavg[2]; 82136404Speter la[3] = averunnable.fscale; 83136404Speter return SYSCTL_OUT(req, la, sizeof(la)); 84136404Speter } else 85136404Speter#endif 86136404Speter return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 87136404Speter} 88187658SjhbSYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 89187658Sjhb CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 90187658Sjhb "Machine loadaverage history"); 91136404Speter 92302063Skib/* 93302063Skib * This function aims to determine if the object is mapped, 94302063Skib * specifically, if it is referenced by a vm_map_entry. Because 95302063Skib * objects occasionally acquire transient references that do not 96302063Skib * represent a mapping, the method used here is inexact. However, it 97302063Skib * has very low overhead and is good enough for the advisory 98302063Skib * vm.vmtotal sysctl. 99302063Skib */ 100302063Skibstatic bool 101302063Skibis_object_active(vm_object_t obj) 102302063Skib{ 103302063Skib 104302063Skib return (obj->ref_count > obj->shadow_count); 105302063Skib} 106302063Skib 10712286Sphkstatic int 10862573Sphkvmtotal(SYSCTL_HANDLER_ARGS) 1091541Srgrimes{ 110164437Sru struct vmtotal total; 11112286Sphk vm_object_t object; 112302063Skib struct proc *p; 11399072Sjulian struct thread *td; 1141541Srgrimes 115164437Sru bzero(&total, sizeof(total)); 116302063Skib 1171541Srgrimes /* 1181541Srgrimes * Calculate process statistics. 1191541Srgrimes */ 12074927Sjhb sx_slock(&allproc_lock); 12183366Sjulian FOREACH_PROC_IN_SYSTEM(p) { 1221541Srgrimes if (p->p_flag & P_SYSTEM) 1231541Srgrimes continue; 124177368Sjeff PROC_LOCK(p); 12599072Sjulian switch (p->p_state) { 12699072Sjulian case PRS_NEW: 127177368Sjeff PROC_UNLOCK(p); 1281541Srgrimes continue; 1291541Srgrimes break; 13099072Sjulian default: 13199072Sjulian FOREACH_THREAD_IN_PROC(p, td) { 132170307Sjeff thread_lock(td); 13399072Sjulian switch (td->td_state) { 134103216Sjulian case TDS_INHIBITED: 135177085Sjeff if (TD_IS_SWAPPED(td)) 136164437Sru total.t_sw++; 137302063Skib else if (TD_IS_SLEEPING(td)) { 138302063Skib if (td->td_priority <= PZERO) 139302063Skib total.t_dw++; 140302063Skib else 141302063Skib total.t_sl++; 142302063Skib if (td->td_wchan == 143302063Skib &vm_cnt.v_free_count) 144302063Skib total.t_pw++; 145302063Skib } 14699072Sjulian break; 1471541Srgrimes 148103216Sjulian case TDS_CAN_RUN: 149164437Sru total.t_sw++; 150103216Sjulian break; 15199072Sjulian case TDS_RUNQ: 15299072Sjulian case TDS_RUNNING: 153164437Sru total.t_rq++; 154170307Sjeff thread_unlock(td); 15599072Sjulian continue; 15699072Sjulian default: 15799072Sjulian break; 15899072Sjulian } 159170307Sjeff thread_unlock(td); 16071572Sjhb } 1611541Srgrimes } 162177368Sjeff PROC_UNLOCK(p); 1631541Srgrimes } 16474927Sjhb sx_sunlock(&allproc_lock); 1651541Srgrimes /* 1661541Srgrimes * Calculate object memory usage statistics. 1671541Srgrimes */ 16895112Salc mtx_lock(&vm_object_list_mtx); 16975523Salfred TAILQ_FOREACH(object, &vm_object_list, object_list) { 17042957Sdillon /* 171282660Sjhb * Perform unsynchronized reads on the object. In 172282660Sjhb * this case, the lack of synchronization should not 173282660Sjhb * impair the accuracy of the reported statistics. 17442957Sdillon */ 175244043Salc if ((object->flags & OBJ_FICTITIOUS) != 0) { 176124083Salc /* 177124083Salc * Devices, like /dev/mem, will badly skew our totals. 178124083Salc */ 17942957Sdillon continue; 180108585Salc } 181164429Sru if (object->ref_count == 0) { 182164429Sru /* 183164429Sru * Also skip unreferenced objects, including 184164429Sru * vnodes representing mounted file systems. 185164429Sru */ 186164429Sru continue; 187164429Sru } 188302063Skib if (object->ref_count == 1 && 189302063Skib (object->flags & OBJ_NOSPLIT) != 0) { 190302063Skib /* 191302063Skib * Also skip otherwise unreferenced swap 192302063Skib * objects backing tmpfs vnodes, and POSIX or 193302063Skib * SysV shared memory. 194302063Skib */ 195302063Skib continue; 196302063Skib } 197164437Sru total.t_vm += object->size; 198164437Sru total.t_rm += object->resident_page_count; 199302063Skib if (is_object_active(object)) { 200164437Sru total.t_avm += object->size; 201164437Sru total.t_arm += object->resident_page_count; 2021541Srgrimes } 20318169Sdyson if (object->shadow_count > 1) { 2041541Srgrimes /* shared object */ 205164437Sru total.t_vmshr += object->size; 206164437Sru total.t_rmshr += object->resident_page_count; 207302063Skib if (is_object_active(object)) { 208164437Sru total.t_avmshr += object->size; 209164437Sru total.t_armshr += object->resident_page_count; 2101541Srgrimes } 2111541Srgrimes } 2121541Srgrimes } 21395112Salc mtx_unlock(&vm_object_list_mtx); 214263620Sbdrewery total.t_free = vm_cnt.v_free_count + vm_cnt.v_cache_count; 215164437Sru return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 2161541Srgrimes} 21712286Sphk 21893823Sdillon/* 21993823Sdillon * vcnt() - accumulate statistics from all cpus and the global cnt 22093823Sdillon * structure. 22193823Sdillon * 22293823Sdillon * The vmmeter structure is now per-cpu as well as global. Those 22393823Sdillon * statistics which can be kept on a per-cpu basis (to avoid cache 22493823Sdillon * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 22593823Sdillon * statistics, such as v_free_reserved, are left in the global 22693823Sdillon * structure. 22793823Sdillon * 22893823Sdillon * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 22993823Sdillon */ 23093823Sdillonstatic int 23193823Sdillonvcnt(SYSCTL_HANDLER_ARGS) 23293823Sdillon{ 23393823Sdillon int count = *(int *)arg1; 234263620Sbdrewery int offset = (char *)arg1 - (char *)&vm_cnt; 23593823Sdillon int i; 23693823Sdillon 237218592Sjmallett CPU_FOREACH(i) { 23893823Sdillon struct pcpu *pcpu = pcpu_find(i); 23993823Sdillon count += *(int *)((char *)&pcpu->pc_cnt + offset); 24093823Sdillon } 241144970Sjhb return (SYSCTL_OUT(req, &count, sizeof(int))); 24293823Sdillon} 24393823Sdillon 244187658SjhbSYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 24546381Sbillf 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 24646381Sbillf "System virtual memory statistics"); 247141696SphkSYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 248141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 249141630Sphk "VM meter sys stats"); 250141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 251141630Sphk "VM meter vm stats"); 25240794SpeterSYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 25393823Sdillon 254228498Seadler#define VM_STATS(parent, var, descr) \ 255228498Seadler SYSCTL_PROC(parent, OID_AUTO, var, \ 256263620Sbdrewery CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, vcnt, \ 257228498Seadler "IU", descr) 258228498Seadler#define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 259228498Seadler#define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 26093823Sdillon 261228449SeadlerVM_STATS_SYS(v_swtch, "Context switches"); 262228449SeadlerVM_STATS_SYS(v_trap, "Traps"); 263228449SeadlerVM_STATS_SYS(v_syscall, "System calls"); 264228449SeadlerVM_STATS_SYS(v_intr, "Device interrupts"); 265228449SeadlerVM_STATS_SYS(v_soft, "Software interrupts"); 266228498SeadlerVM_STATS_VM(v_vm_faults, "Address memory faults"); 267246032SzontVM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 268228498SeadlerVM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 269228498SeadlerVM_STATS_VM(v_cow_optim, "Optimized COW faults"); 270228498SeadlerVM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 271228498SeadlerVM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 272228498SeadlerVM_STATS_VM(v_swapin, "Swap pager pageins"); 273228498SeadlerVM_STATS_VM(v_swapout, "Swap pager pageouts"); 274228498SeadlerVM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 275228498SeadlerVM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 276228498SeadlerVM_STATS_VM(v_vnodein, "Vnode pager pageins"); 277228498SeadlerVM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 278228498SeadlerVM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 279228498SeadlerVM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 280228498SeadlerVM_STATS_VM(v_intrans, "In transit page faults"); 281228498SeadlerVM_STATS_VM(v_reactivated, "Pages reactivated from free list"); 282228498SeadlerVM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 283228498SeadlerVM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 284228498SeadlerVM_STATS_VM(v_tcached, "Total pages cached"); 285228498SeadlerVM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 286228498SeadlerVM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 287228498SeadlerVM_STATS_VM(v_tfree, "Total pages freed"); 288228498SeadlerVM_STATS_VM(v_page_size, "Page size in bytes"); 289228498SeadlerVM_STATS_VM(v_page_count, "Total number of pages in system"); 290228498SeadlerVM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 291228498SeadlerVM_STATS_VM(v_free_target, "Pages desired free"); 292228498SeadlerVM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 293228498SeadlerVM_STATS_VM(v_free_count, "Free pages"); 294228498SeadlerVM_STATS_VM(v_wire_count, "Wired pages"); 295228498SeadlerVM_STATS_VM(v_active_count, "Active pages"); 296228498SeadlerVM_STATS_VM(v_inactive_target, "Desired inactive pages"); 297228498SeadlerVM_STATS_VM(v_inactive_count, "Inactive pages"); 298228498SeadlerVM_STATS_VM(v_cache_count, "Pages on cache queue"); 299228498SeadlerVM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 300228498SeadlerVM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 301228498SeadlerVM_STATS_VM(v_forks, "Number of fork() calls"); 302228498SeadlerVM_STATS_VM(v_vforks, "Number of vfork() calls"); 303228498SeadlerVM_STATS_VM(v_rforks, "Number of rfork() calls"); 304228498SeadlerVM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 305228498SeadlerVM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 306228498SeadlerVM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 307228498SeadlerVM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 308228498SeadlerVM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 309228449Seadler 310228449SeadlerSYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 311228449Seadler &vm_page_zero_count, 0, "Number of zero-ed free pages"); 312