vm_meter.c revision 282660
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: head/sys/vm/vm_meter.c 282660 2015-05-08 19:43:37Z jhb $"); 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_CACHE_MIN, v_cache_min, 67 CTLFLAG_RW, &vm_cnt.v_cache_min, 0, "Min pages on cache queue"); 68SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max, 69 CTLFLAG_RW, &vm_cnt.v_cache_max, 0, "Max pages on cache queue"); 70SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min, 71 CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel"); 72SYSCTL_UINT(_vm, OID_AUTO, v_free_severe, 73 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point"); 74 75static int 76sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS) 77{ 78 79#ifdef SCTL_MASK32 80 u_int32_t la[4]; 81 82 if (req->flags & SCTL_MASK32) { 83 la[0] = averunnable.ldavg[0]; 84 la[1] = averunnable.ldavg[1]; 85 la[2] = averunnable.ldavg[2]; 86 la[3] = averunnable.fscale; 87 return SYSCTL_OUT(req, la, sizeof(la)); 88 } else 89#endif 90 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable)); 91} 92SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD | 93 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg", 94 "Machine loadaverage history"); 95 96static int 97vmtotal(SYSCTL_HANDLER_ARGS) 98{ 99 struct proc *p; 100 struct vmtotal total; 101 vm_map_entry_t entry; 102 vm_object_t object; 103 vm_map_t map; 104 int paging; 105 struct thread *td; 106 struct vmspace *vm; 107 108 bzero(&total, sizeof(total)); 109 /* 110 * Mark all objects as inactive. 111 */ 112 mtx_lock(&vm_object_list_mtx); 113 TAILQ_FOREACH(object, &vm_object_list, object_list) { 114 VM_OBJECT_WLOCK(object); 115 vm_object_clear_flag(object, OBJ_ACTIVE); 116 VM_OBJECT_WUNLOCK(object); 117 } 118 mtx_unlock(&vm_object_list_mtx); 119 /* 120 * Calculate process statistics. 121 */ 122 sx_slock(&allproc_lock); 123 FOREACH_PROC_IN_SYSTEM(p) { 124 if (p->p_flag & P_SYSTEM) 125 continue; 126 PROC_LOCK(p); 127 switch (p->p_state) { 128 case PRS_NEW: 129 PROC_UNLOCK(p); 130 continue; 131 break; 132 default: 133 FOREACH_THREAD_IN_PROC(p, td) { 134 thread_lock(td); 135 switch (td->td_state) { 136 case TDS_INHIBITED: 137 if (TD_IS_SWAPPED(td)) 138 total.t_sw++; 139 else if (TD_IS_SLEEPING(td) && 140 td->td_priority <= PZERO) 141 total.t_dw++; 142 else 143 total.t_sl++; 144 break; 145 146 case TDS_CAN_RUN: 147 total.t_sw++; 148 break; 149 case TDS_RUNQ: 150 case TDS_RUNNING: 151 total.t_rq++; 152 thread_unlock(td); 153 continue; 154 default: 155 break; 156 } 157 thread_unlock(td); 158 } 159 } 160 PROC_UNLOCK(p); 161 /* 162 * Note active objects. 163 */ 164 paging = 0; 165 vm = vmspace_acquire_ref(p); 166 if (vm == NULL) 167 continue; 168 map = &vm->vm_map; 169 vm_map_lock_read(map); 170 for (entry = map->header.next; 171 entry != &map->header; entry = entry->next) { 172 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) || 173 (object = entry->object.vm_object) == NULL) 174 continue; 175 VM_OBJECT_WLOCK(object); 176 vm_object_set_flag(object, OBJ_ACTIVE); 177 paging |= object->paging_in_progress; 178 VM_OBJECT_WUNLOCK(object); 179 } 180 vm_map_unlock_read(map); 181 vmspace_free(vm); 182 if (paging) 183 total.t_pw++; 184 } 185 sx_sunlock(&allproc_lock); 186 /* 187 * Calculate object memory usage statistics. 188 */ 189 mtx_lock(&vm_object_list_mtx); 190 TAILQ_FOREACH(object, &vm_object_list, object_list) { 191 /* 192 * Perform unsynchronized reads on the object. In 193 * this case, the lack of synchronization should not 194 * impair the accuracy of the reported statistics. 195 */ 196 if ((object->flags & OBJ_FICTITIOUS) != 0) { 197 /* 198 * Devices, like /dev/mem, will badly skew our totals. 199 */ 200 continue; 201 } 202 if (object->ref_count == 0) { 203 /* 204 * Also skip unreferenced objects, including 205 * vnodes representing mounted file systems. 206 */ 207 continue; 208 } 209 total.t_vm += object->size; 210 total.t_rm += object->resident_page_count; 211 if (object->flags & OBJ_ACTIVE) { 212 total.t_avm += object->size; 213 total.t_arm += object->resident_page_count; 214 } 215 if (object->shadow_count > 1) { 216 /* shared object */ 217 total.t_vmshr += object->size; 218 total.t_rmshr += object->resident_page_count; 219 if (object->flags & OBJ_ACTIVE) { 220 total.t_avmshr += object->size; 221 total.t_armshr += object->resident_page_count; 222 } 223 } 224 } 225 mtx_unlock(&vm_object_list_mtx); 226 total.t_free = vm_cnt.v_free_count + vm_cnt.v_cache_count; 227 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req)); 228} 229 230/* 231 * vcnt() - accumulate statistics from all cpus and the global cnt 232 * structure. 233 * 234 * The vmmeter structure is now per-cpu as well as global. Those 235 * statistics which can be kept on a per-cpu basis (to avoid cache 236 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining 237 * statistics, such as v_free_reserved, are left in the global 238 * structure. 239 * 240 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req) 241 */ 242static int 243vcnt(SYSCTL_HANDLER_ARGS) 244{ 245 int count = *(int *)arg1; 246 int offset = (char *)arg1 - (char *)&vm_cnt; 247 int i; 248 249 CPU_FOREACH(i) { 250 struct pcpu *pcpu = pcpu_find(i); 251 count += *(int *)((char *)&pcpu->pc_cnt + offset); 252 } 253 return (SYSCTL_OUT(req, &count, sizeof(int))); 254} 255 256SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, 257 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 258 "System virtual memory statistics"); 259SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats"); 260static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, 261 "VM meter sys stats"); 262static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, 263 "VM meter vm stats"); 264SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats"); 265 266#define VM_STATS(parent, var, descr) \ 267 SYSCTL_PROC(parent, OID_AUTO, var, \ 268 CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, vcnt, \ 269 "IU", descr) 270#define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr) 271#define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr) 272 273VM_STATS_SYS(v_swtch, "Context switches"); 274VM_STATS_SYS(v_trap, "Traps"); 275VM_STATS_SYS(v_syscall, "System calls"); 276VM_STATS_SYS(v_intr, "Device interrupts"); 277VM_STATS_SYS(v_soft, "Software interrupts"); 278VM_STATS_VM(v_vm_faults, "Address memory faults"); 279VM_STATS_VM(v_io_faults, "Page faults requiring I/O"); 280VM_STATS_VM(v_cow_faults, "Copy-on-write faults"); 281VM_STATS_VM(v_cow_optim, "Optimized COW faults"); 282VM_STATS_VM(v_zfod, "Pages zero-filled on demand"); 283VM_STATS_VM(v_ozfod, "Optimized zero fill pages"); 284VM_STATS_VM(v_swapin, "Swap pager pageins"); 285VM_STATS_VM(v_swapout, "Swap pager pageouts"); 286VM_STATS_VM(v_swappgsin, "Swap pages swapped in"); 287VM_STATS_VM(v_swappgsout, "Swap pages swapped out"); 288VM_STATS_VM(v_vnodein, "Vnode pager pageins"); 289VM_STATS_VM(v_vnodeout, "Vnode pager pageouts"); 290VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in"); 291VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out"); 292VM_STATS_VM(v_intrans, "In transit page faults"); 293VM_STATS_VM(v_reactivated, "Pages reactivated from free list"); 294VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups"); 295VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon"); 296VM_STATS_VM(v_tcached, "Total pages cached"); 297VM_STATS_VM(v_dfree, "Pages freed by pagedaemon"); 298VM_STATS_VM(v_pfree, "Pages freed by exiting processes"); 299VM_STATS_VM(v_tfree, "Total pages freed"); 300VM_STATS_VM(v_page_size, "Page size in bytes"); 301VM_STATS_VM(v_page_count, "Total number of pages in system"); 302VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock"); 303VM_STATS_VM(v_free_target, "Pages desired free"); 304VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold"); 305VM_STATS_VM(v_free_count, "Free pages"); 306VM_STATS_VM(v_wire_count, "Wired pages"); 307VM_STATS_VM(v_active_count, "Active pages"); 308VM_STATS_VM(v_inactive_target, "Desired inactive pages"); 309VM_STATS_VM(v_inactive_count, "Inactive pages"); 310VM_STATS_VM(v_cache_count, "Pages on cache queue"); 311VM_STATS_VM(v_cache_min, "Min pages on cache queue"); 312VM_STATS_VM(v_cache_max, "Max pages on cached queue"); 313VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel"); 314VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code"); 315VM_STATS_VM(v_forks, "Number of fork() calls"); 316VM_STATS_VM(v_vforks, "Number of vfork() calls"); 317VM_STATS_VM(v_rforks, "Number of rfork() calls"); 318VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel"); 319VM_STATS_VM(v_forkpages, "VM pages affected by fork()"); 320VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()"); 321VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()"); 322VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel"); 323 324SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD, 325 &vm_page_zero_count, 0, "Number of zero-ed free pages"); 326