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: stable/11/sys/vm/vm_meter.c 320605 2017-07-03 16:40:05Z markj $"); 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/rwlock.h> 43#include <sys/sx.h> 44#include <sys/vmmeter.h> 45#include <sys/smp.h> 46 47#include <vm/vm.h> 48#include <vm/vm_page.h> 49#include <vm/vm_extern.h> 50#include <vm/vm_param.h> 51#include <vm/pmap.h> 52#include <vm/vm_map.h> 53#include <vm/vm_object.h> 54#include <sys/sysctl.h> 55 56struct vmmeter vm_cnt; 57 58SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min, 59 CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold"); 60SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target, 61 CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages"); 62SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved, 63 CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock"); 64SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target, 65 CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive"); 66SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 67 CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 68SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 69 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point"); 70 71static int 72sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 73{ 74 75#ifdef SCTL_MASK32 76 u_int32_t la[4]; 77 78 if (req->flags & SCTL_MASK32) { 79 la[0] = averunnable.ldavg[0]; 80 la[1] = averunnable.ldavg[1]; 81 la[2] = averunnable.ldavg[2]; 82 la[3] = averunnable.fscale; 83 return SYSCTL_OUT(req, la, sizeof(la)); 84 } else 85#endif 86 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 87} 88SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 89 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 90 "Machine loadaverage history"); 91 92/* 93 * This function aims to determine if the object is mapped, 94 * specifically, if it is referenced by a vm_map_entry. Because 95 * objects occasionally acquire transient references that do not 96 * represent a mapping, the method used here is inexact. However, it 97 * has very low overhead and is good enough for the advisory 98 * vm.vmtotal sysctl. 99 */ 100static bool 101is_object_active(vm_object_t obj) 102{ 103 104 return (obj->ref_count > obj->shadow_count); 105} 106 107static int 108vmtotal(SYSCTL_HANDLER_ARGS) 109{ 110 struct vmtotal total; 111 vm_object_t object; 112 struct proc *p; 113 struct thread *td; 114 115 bzero(&total, sizeof(total)); 116 117 /* 118 * Calculate process statistics. 119 */ 120 sx_slock(&allproc_lock); 121 FOREACH_PROC_IN_SYSTEM(p) { 122 if ((p->p_flag & P_SYSTEM) != 0) 123 continue; 124 PROC_LOCK(p); 125 if (p->p_state != PRS_NEW) { 126 FOREACH_THREAD_IN_PROC(p, td) { 127 thread_lock(td); 128 switch (td->td_state) { 129 case TDS_INHIBITED: 130 if (TD_IS_SWAPPED(td)) 131 total.t_sw++; 132 else if (TD_IS_SLEEPING(td)) { 133 if (td->td_priority <= PZERO) 134 total.t_dw++; 135 else 136 total.t_sl++; 137 if (td->td_wchan == 138 &vm_cnt.v_free_count) 139 total.t_pw++; 140 } 141 break; 142 case TDS_CAN_RUN: 143 total.t_sw++; 144 break; 145 case TDS_RUNQ: 146 case TDS_RUNNING: 147 total.t_rq++; 148 break; 149 default: 150 break; 151 } 152 thread_unlock(td); 153 } 154 } 155 PROC_UNLOCK(p); 156 } 157 sx_sunlock(&allproc_lock); 158 /* 159 * Calculate object memory usage statistics. 160 */ 161 mtx_lock(&vm_object_list_mtx); 162 TAILQ_FOREACH(object, &vm_object_list, object_list) { 163 /* 164 * Perform unsynchronized reads on the object. In 165 * this case, the lack of synchronization should not 166 * impair the accuracy of the reported statistics. 167 */ 168 if ((object->flags & OBJ_FICTITIOUS) != 0) { 169 /* 170 * Devices, like /dev/mem, will badly skew our totals. 171 */ 172 continue; 173 } 174 if (object->ref_count == 0) { 175 /* 176 * Also skip unreferenced objects, including 177 * vnodes representing mounted file systems. 178 */ 179 continue; 180 } 181 if (object->ref_count == 1 && 182 (object->flags & OBJ_NOSPLIT) != 0) { 183 /* 184 * Also skip otherwise unreferenced swap 185 * objects backing tmpfs vnodes, and POSIX or 186 * SysV shared memory. 187 */ 188 continue; 189 } 190 total.t_vm += object->size; 191 total.t_rm += object->resident_page_count; 192 if (is_object_active(object)) { 193 total.t_avm += object->size; 194 total.t_arm += object->resident_page_count; 195 } 196 if (object->shadow_count > 1) { 197 /* shared object */ 198 total.t_vmshr += object->size; 199 total.t_rmshr += object->resident_page_count; 200 if (is_object_active(object)) { 201 total.t_avmshr += object->size; 202 total.t_armshr += object->resident_page_count; 203 } 204 } 205 } 206 mtx_unlock(&vm_object_list_mtx); 207 total.t_free = vm_cnt.v_free_count; 208 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 209} 210 211/* 212 * vm_meter_cnt() - accumulate statistics from all cpus and the global cnt 213 * structure. 214 * 215 * The vmmeter structure is now per-cpu as well as global. Those 216 * statistics which can be kept on a per-cpu basis (to avoid cache 217 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 218 * statistics, such as v_free_reserved, are left in the global 219 * structure. 220 */ 221u_int 222vm_meter_cnt(size_t offset) 223{ 224 struct pcpu *pcpu; 225 u_int count; 226 int i; 227 228 count = *(u_int *)((char *)&vm_cnt + offset); 229 CPU_FOREACH(i) { 230 pcpu = pcpu_find(i); 231 count += *(u_int *)((char *)&pcpu->pc_cnt + offset); 232 } 233 return (count); 234} 235 236static int 237cnt_sysctl(SYSCTL_HANDLER_ARGS) 238{ 239 u_int count; 240 241 count = vm_meter_cnt((char *)arg1 - (char *)&vm_cnt); 242 return (SYSCTL_OUT(req, &count, sizeof(count))); 243} 244 245SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 246 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 247 "System virtual memory statistics"); 248SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 249static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 250 "VM meter sys stats"); 251static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 252 "VM meter vm stats"); 253SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 254 255#define VM_STATS(parent, var, descr) \ 256 SYSCTL_PROC(parent, OID_AUTO, var, \ 257 CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, \ 258 cnt_sysctl, "IU", descr) 259#define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 260#define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 261 262VM_STATS_SYS(v_swtch, "Context switches"); 263VM_STATS_SYS(v_trap, "Traps"); 264VM_STATS_SYS(v_syscall, "System calls"); 265VM_STATS_SYS(v_intr, "Device interrupts"); 266VM_STATS_SYS(v_soft, "Software interrupts"); 267VM_STATS_VM(v_vm_faults, "Address memory faults"); 268VM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 269VM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 270VM_STATS_VM(v_cow_optim, "Optimized COW faults"); 271VM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 272VM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 273VM_STATS_VM(v_swapin, "Swap pager pageins"); 274VM_STATS_VM(v_swapout, "Swap pager pageouts"); 275VM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 276VM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 277VM_STATS_VM(v_vnodein, "Vnode pager pageins"); 278VM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 279VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 280VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 281VM_STATS_VM(v_intrans, "In transit page faults"); 282VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon"); 283VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 284VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 285VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls"); 286VM_STATS_VM(v_tcached, "Total pages cached"); 287VM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 288VM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 289VM_STATS_VM(v_tfree, "Total pages freed"); 290VM_STATS_VM(v_page_size, "Page size in bytes"); 291VM_STATS_VM(v_page_count, "Total number of pages in system"); 292VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 293VM_STATS_VM(v_free_target, "Pages desired free"); 294VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 295VM_STATS_VM(v_free_count, "Free pages"); 296VM_STATS_VM(v_wire_count, "Wired pages"); 297VM_STATS_VM(v_active_count, "Active pages"); 298VM_STATS_VM(v_inactive_target, "Desired inactive pages"); 299VM_STATS_VM(v_inactive_count, "Inactive pages"); 300VM_STATS_VM(v_laundry_count, "Pages eligible for laundering"); 301VM_STATS_VM(v_cache_count, "Pages on cache queue"); 302VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 303VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 304VM_STATS_VM(v_forks, "Number of fork() calls"); 305VM_STATS_VM(v_vforks, "Number of vfork() calls"); 306VM_STATS_VM(v_rforks, "Number of rfork() calls"); 307VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 308VM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 309VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 310VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 311VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 312 313SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 314 &vm_page_zero_count, 0, "Number of zero-ed free pages"); 315