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/11/sys/vm/vm_meter.c 320605 2017-07-03 16:40:05Z markj $"); 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) { 122311047Skib if ((p->p_flag & P_SYSTEM) != 0) 1231541Srgrimes continue; 124177368Sjeff PROC_LOCK(p); 125311047Skib if (p->p_state != PRS_NEW) { 12699072Sjulian FOREACH_THREAD_IN_PROC(p, td) { 127170307Sjeff thread_lock(td); 12899072Sjulian switch (td->td_state) { 129103216Sjulian case TDS_INHIBITED: 130177085Sjeff if (TD_IS_SWAPPED(td)) 131164437Sru total.t_sw++; 132302063Skib else if (TD_IS_SLEEPING(td)) { 133302063Skib if (td->td_priority <= PZERO) 134302063Skib total.t_dw++; 135302063Skib else 136302063Skib total.t_sl++; 137302063Skib if (td->td_wchan == 138302063Skib &vm_cnt.v_free_count) 139302063Skib total.t_pw++; 140302063Skib } 14199072Sjulian break; 142103216Sjulian case TDS_CAN_RUN: 143164437Sru total.t_sw++; 144103216Sjulian break; 14599072Sjulian case TDS_RUNQ: 14699072Sjulian case TDS_RUNNING: 147164437Sru total.t_rq++; 148311047Skib break; 14999072Sjulian default: 15099072Sjulian break; 15199072Sjulian } 152170307Sjeff thread_unlock(td); 15371572Sjhb } 1541541Srgrimes } 155177368Sjeff PROC_UNLOCK(p); 1561541Srgrimes } 15774927Sjhb sx_sunlock(&allproc_lock); 1581541Srgrimes /* 1591541Srgrimes * Calculate object memory usage statistics. 1601541Srgrimes */ 16195112Salc mtx_lock(&vm_object_list_mtx); 16275523Salfred TAILQ_FOREACH(object, &vm_object_list, object_list) { 16342957Sdillon /* 164282660Sjhb * Perform unsynchronized reads on the object. In 165282660Sjhb * this case, the lack of synchronization should not 166282660Sjhb * impair the accuracy of the reported statistics. 16742957Sdillon */ 168244043Salc if ((object->flags & OBJ_FICTITIOUS) != 0) { 169124083Salc /* 170124083Salc * Devices, like /dev/mem, will badly skew our totals. 171124083Salc */ 17242957Sdillon continue; 173108585Salc } 174164429Sru if (object->ref_count == 0) { 175164429Sru /* 176164429Sru * Also skip unreferenced objects, including 177164429Sru * vnodes representing mounted file systems. 178164429Sru */ 179164429Sru continue; 180164429Sru } 181302063Skib if (object->ref_count == 1 && 182302063Skib (object->flags & OBJ_NOSPLIT) != 0) { 183302063Skib /* 184302063Skib * Also skip otherwise unreferenced swap 185302063Skib * objects backing tmpfs vnodes, and POSIX or 186302063Skib * SysV shared memory. 187302063Skib */ 188302063Skib continue; 189302063Skib } 190164437Sru total.t_vm += object->size; 191164437Sru total.t_rm += object->resident_page_count; 192302063Skib if (is_object_active(object)) { 193164437Sru total.t_avm += object->size; 194164437Sru total.t_arm += object->resident_page_count; 1951541Srgrimes } 19618169Sdyson if (object->shadow_count > 1) { 1971541Srgrimes /* shared object */ 198164437Sru total.t_vmshr += object->size; 199164437Sru total.t_rmshr += object->resident_page_count; 200302063Skib if (is_object_active(object)) { 201164437Sru total.t_avmshr += object->size; 202164437Sru total.t_armshr += object->resident_page_count; 2031541Srgrimes } 2041541Srgrimes } 2051541Srgrimes } 20695112Salc mtx_unlock(&vm_object_list_mtx); 207320605Smarkj total.t_free = vm_cnt.v_free_count; 208164437Sru return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 2091541Srgrimes} 21012286Sphk 21193823Sdillon/* 212318716Smarkj * vm_meter_cnt() - accumulate statistics from all cpus and the global cnt 213318716Smarkj * structure. 21493823Sdillon * 21593823Sdillon * The vmmeter structure is now per-cpu as well as global. Those 21693823Sdillon * statistics which can be kept on a per-cpu basis (to avoid cache 21793823Sdillon * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 21893823Sdillon * statistics, such as v_free_reserved, are left in the global 21993823Sdillon * structure. 22093823Sdillon */ 221318716Smarkju_int 222318716Smarkjvm_meter_cnt(size_t offset) 22393823Sdillon{ 224318716Smarkj struct pcpu *pcpu; 225318716Smarkj u_int count; 22693823Sdillon int i; 22793823Sdillon 228318716Smarkj count = *(u_int *)((char *)&vm_cnt + offset); 229218592Sjmallett CPU_FOREACH(i) { 230318716Smarkj pcpu = pcpu_find(i); 231318716Smarkj count += *(u_int *)((char *)&pcpu->pc_cnt + offset); 23293823Sdillon } 233318716Smarkj return (count); 23493823Sdillon} 23593823Sdillon 236318716Smarkjstatic int 237318716Smarkjcnt_sysctl(SYSCTL_HANDLER_ARGS) 238318716Smarkj{ 239318716Smarkj u_int count; 240318716Smarkj 241318716Smarkj count = vm_meter_cnt((char *)arg1 - (char *)&vm_cnt); 242318716Smarkj return (SYSCTL_OUT(req, &count, sizeof(count))); 243318716Smarkj} 244318716Smarkj 245187658SjhbSYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 24646381Sbillf 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 24746381Sbillf "System virtual memory statistics"); 248141696SphkSYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 249141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 250141630Sphk "VM meter sys stats"); 251141630Sphkstatic SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 252141630Sphk "VM meter vm stats"); 25340794SpeterSYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 25493823Sdillon 255228498Seadler#define VM_STATS(parent, var, descr) \ 256228498Seadler SYSCTL_PROC(parent, OID_AUTO, var, \ 257318716Smarkj CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, \ 258318716Smarkj cnt_sysctl, "IU", descr) 259228498Seadler#define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 260228498Seadler#define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 26193823Sdillon 262228449SeadlerVM_STATS_SYS(v_swtch, "Context switches"); 263228449SeadlerVM_STATS_SYS(v_trap, "Traps"); 264228449SeadlerVM_STATS_SYS(v_syscall, "System calls"); 265228449SeadlerVM_STATS_SYS(v_intr, "Device interrupts"); 266228449SeadlerVM_STATS_SYS(v_soft, "Software interrupts"); 267228498SeadlerVM_STATS_VM(v_vm_faults, "Address memory faults"); 268246032SzontVM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 269228498SeadlerVM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 270228498SeadlerVM_STATS_VM(v_cow_optim, "Optimized COW faults"); 271228498SeadlerVM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 272228498SeadlerVM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 273228498SeadlerVM_STATS_VM(v_swapin, "Swap pager pageins"); 274228498SeadlerVM_STATS_VM(v_swapout, "Swap pager pageouts"); 275228498SeadlerVM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 276228498SeadlerVM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 277228498SeadlerVM_STATS_VM(v_vnodein, "Vnode pager pageins"); 278228498SeadlerVM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 279228498SeadlerVM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 280228498SeadlerVM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 281228498SeadlerVM_STATS_VM(v_intrans, "In transit page faults"); 282318716SmarkjVM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon"); 283228498SeadlerVM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 284228498SeadlerVM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 285318716SmarkjVM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls"); 286228498SeadlerVM_STATS_VM(v_tcached, "Total pages cached"); 287228498SeadlerVM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 288228498SeadlerVM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 289228498SeadlerVM_STATS_VM(v_tfree, "Total pages freed"); 290228498SeadlerVM_STATS_VM(v_page_size, "Page size in bytes"); 291228498SeadlerVM_STATS_VM(v_page_count, "Total number of pages in system"); 292228498SeadlerVM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 293228498SeadlerVM_STATS_VM(v_free_target, "Pages desired free"); 294228498SeadlerVM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 295228498SeadlerVM_STATS_VM(v_free_count, "Free pages"); 296228498SeadlerVM_STATS_VM(v_wire_count, "Wired pages"); 297228498SeadlerVM_STATS_VM(v_active_count, "Active pages"); 298228498SeadlerVM_STATS_VM(v_inactive_target, "Desired inactive pages"); 299228498SeadlerVM_STATS_VM(v_inactive_count, "Inactive pages"); 300318716SmarkjVM_STATS_VM(v_laundry_count, "Pages eligible for laundering"); 301228498SeadlerVM_STATS_VM(v_cache_count, "Pages on cache queue"); 302228498SeadlerVM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 303228498SeadlerVM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 304228498SeadlerVM_STATS_VM(v_forks, "Number of fork() calls"); 305228498SeadlerVM_STATS_VM(v_vforks, "Number of vfork() calls"); 306228498SeadlerVM_STATS_VM(v_rforks, "Number of rfork() calls"); 307228498SeadlerVM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 308228498SeadlerVM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 309228498SeadlerVM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 310228498SeadlerVM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 311228498SeadlerVM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 312228449Seadler 313228449SeadlerSYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 314228449Seadler &vm_page_zero_count, 0, "Number of zero-ed free pages"); 315