2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
39 #include <sys/mutex.h>
41 #include <sys/resource.h>
42 #include <sys/rwlock.h>
44 #include <sys/vmmeter.h>
48 #include <vm/vm_page.h>
49 #include <vm/vm_extern.h>
50 #include <vm/vm_param.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_object.h>
54 #include <sys/sysctl.h>
56 struct vmmeter vm_cnt;
58 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
59 CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold");
60 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
61 CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages");
62 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
63 CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock");
64 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
65 CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive");
66 SYSCTL_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");
68 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
69 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point");
72 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
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));
86 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
88 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
89 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
90 "Machine loadaverage history");
93 vmtotal(SYSCTL_HANDLER_ARGS)
104 bzero(&total, sizeof(total));
106 * Mark all objects as inactive.
108 mtx_lock(&vm_object_list_mtx);
109 TAILQ_FOREACH(object, &vm_object_list, object_list) {
110 VM_OBJECT_WLOCK(object);
111 vm_object_clear_flag(object, OBJ_ACTIVE);
112 VM_OBJECT_WUNLOCK(object);
114 mtx_unlock(&vm_object_list_mtx);
116 * Calculate process statistics.
118 sx_slock(&allproc_lock);
119 FOREACH_PROC_IN_SYSTEM(p) {
120 if (p->p_flag & P_SYSTEM)
123 switch (p->p_state) {
129 FOREACH_THREAD_IN_PROC(p, td) {
131 switch (td->td_state) {
133 if (TD_IS_SWAPPED(td))
135 else if (TD_IS_SLEEPING(td) &&
136 td->td_priority <= PZERO)
158 * Note active objects.
161 vm = vmspace_acquire_ref(p);
165 vm_map_lock_read(map);
166 for (entry = map->header.next;
167 entry != &map->header; entry = entry->next) {
168 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
169 (object = entry->object.vm_object) == NULL)
171 VM_OBJECT_WLOCK(object);
172 vm_object_set_flag(object, OBJ_ACTIVE);
173 paging |= object->paging_in_progress;
174 VM_OBJECT_WUNLOCK(object);
176 vm_map_unlock_read(map);
181 sx_sunlock(&allproc_lock);
183 * Calculate object memory usage statistics.
185 mtx_lock(&vm_object_list_mtx);
186 TAILQ_FOREACH(object, &vm_object_list, object_list) {
188 * Perform unsynchronized reads on the object. In
189 * this case, the lack of synchronization should not
190 * impair the accuracy of the reported statistics.
192 if ((object->flags & OBJ_FICTITIOUS) != 0) {
194 * Devices, like /dev/mem, will badly skew our totals.
198 if (object->ref_count == 0) {
200 * Also skip unreferenced objects, including
201 * vnodes representing mounted file systems.
205 total.t_vm += object->size;
206 total.t_rm += object->resident_page_count;
207 if (object->flags & OBJ_ACTIVE) {
208 total.t_avm += object->size;
209 total.t_arm += object->resident_page_count;
211 if (object->shadow_count > 1) {
213 total.t_vmshr += object->size;
214 total.t_rmshr += object->resident_page_count;
215 if (object->flags & OBJ_ACTIVE) {
216 total.t_avmshr += object->size;
217 total.t_armshr += object->resident_page_count;
221 mtx_unlock(&vm_object_list_mtx);
222 total.t_free = vm_cnt.v_free_count + vm_cnt.v_cache_count;
223 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
227 * vcnt() - accumulate statistics from all cpus and the global cnt
230 * The vmmeter structure is now per-cpu as well as global. Those
231 * statistics which can be kept on a per-cpu basis (to avoid cache
232 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining
233 * statistics, such as v_free_reserved, are left in the global
236 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
239 vcnt(SYSCTL_HANDLER_ARGS)
241 int count = *(int *)arg1;
242 int offset = (char *)arg1 - (char *)&vm_cnt;
246 struct pcpu *pcpu = pcpu_find(i);
247 count += *(int *)((char *)&pcpu->pc_cnt + offset);
249 return (SYSCTL_OUT(req, &count, sizeof(int)));
252 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
253 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
254 "System virtual memory statistics");
255 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
256 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
257 "VM meter sys stats");
258 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
259 "VM meter vm stats");
260 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
262 #define VM_STATS(parent, var, descr) \
263 SYSCTL_PROC(parent, OID_AUTO, var, \
264 CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, vcnt, \
266 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr)
267 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr)
269 VM_STATS_SYS(v_swtch, "Context switches");
270 VM_STATS_SYS(v_trap, "Traps");
271 VM_STATS_SYS(v_syscall, "System calls");
272 VM_STATS_SYS(v_intr, "Device interrupts");
273 VM_STATS_SYS(v_soft, "Software interrupts");
274 VM_STATS_VM(v_vm_faults, "Address memory faults");
275 VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
276 VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
277 VM_STATS_VM(v_cow_optim, "Optimized COW faults");
278 VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
279 VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
280 VM_STATS_VM(v_swapin, "Swap pager pageins");
281 VM_STATS_VM(v_swapout, "Swap pager pageouts");
282 VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
283 VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
284 VM_STATS_VM(v_vnodein, "Vnode pager pageins");
285 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
286 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
287 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
288 VM_STATS_VM(v_intrans, "In transit page faults");
289 VM_STATS_VM(v_reactivated, "Pages reactivated from free list");
290 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
291 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
292 VM_STATS_VM(v_tcached, "Total pages cached");
293 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
294 VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
295 VM_STATS_VM(v_tfree, "Total pages freed");
296 VM_STATS_VM(v_page_size, "Page size in bytes");
297 VM_STATS_VM(v_page_count, "Total number of pages in system");
298 VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock");
299 VM_STATS_VM(v_free_target, "Pages desired free");
300 VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold");
301 VM_STATS_VM(v_free_count, "Free pages");
302 VM_STATS_VM(v_wire_count, "Wired pages");
303 VM_STATS_VM(v_active_count, "Active pages");
304 VM_STATS_VM(v_inactive_target, "Desired inactive pages");
305 VM_STATS_VM(v_inactive_count, "Inactive pages");
306 VM_STATS_VM(v_cache_count, "Pages on cache queue");
307 VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel");
308 VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code");
309 VM_STATS_VM(v_forks, "Number of fork() calls");
310 VM_STATS_VM(v_vforks, "Number of vfork() calls");
311 VM_STATS_VM(v_rforks, "Number of rfork() calls");
312 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
313 VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
314 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
315 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
316 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
318 SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD,
319 &vm_page_zero_count, 0, "Number of zero-ed free pages");