2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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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.
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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.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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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>
43 #include <sys/vmmeter.h>
47 #include <vm/vm_page.h>
48 #include <vm/vm_extern.h>
49 #include <vm/vm_param.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
53 #include <sys/sysctl.h>
57 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
58 CTLFLAG_RW, &cnt.v_free_min, 0, "Minimum low-free-pages threshold");
59 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
60 CTLFLAG_RW, &cnt.v_free_target, 0, "Desired free pages");
61 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
62 CTLFLAG_RW, &cnt.v_free_reserved, 0, "Pages reserved for deadlock");
63 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
64 CTLFLAG_RW, &cnt.v_inactive_target, 0, "Pages desired inactive");
65 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
66 CTLFLAG_RW, &cnt.v_cache_min, 0, "Min pages on cache queue");
67 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
68 CTLFLAG_RW, &cnt.v_cache_max, 0, "Max pages on cache queue");
69 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
70 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
71 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
72 CTLFLAG_RW, &cnt.v_free_severe, 0, "Severe page depletion point");
75 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
81 if (req->flags & SCTL_MASK32) {
82 la[0] = averunnable.ldavg[0];
83 la[1] = averunnable.ldavg[1];
84 la[2] = averunnable.ldavg[2];
85 la[3] = averunnable.fscale;
86 return SYSCTL_OUT(req, la, sizeof(la));
89 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
91 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
92 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
93 "Machine loadaverage history");
96 vmtotal(SYSCTL_HANDLER_ARGS)
100 vm_map_entry_t entry;
107 bzero(&total, sizeof(total));
109 * Mark all objects as inactive.
111 mtx_lock(&vm_object_list_mtx);
112 TAILQ_FOREACH(object, &vm_object_list, object_list) {
113 if (!VM_OBJECT_TRYLOCK(object)) {
115 * Avoid a lock-order reversal. Consequently,
116 * the reported number of active pages may be
117 * greater than the actual number.
121 vm_object_clear_flag(object, OBJ_ACTIVE);
122 VM_OBJECT_UNLOCK(object);
124 mtx_unlock(&vm_object_list_mtx);
126 * Calculate process statistics.
128 sx_slock(&allproc_lock);
129 FOREACH_PROC_IN_SYSTEM(p) {
130 if (p->p_flag & P_SYSTEM)
133 switch (p->p_state) {
139 FOREACH_THREAD_IN_PROC(p, td) {
141 switch (td->td_state) {
143 if (TD_IS_SWAPPED(td))
145 else if (TD_IS_SLEEPING(td) &&
146 td->td_priority <= PZERO)
168 * Note active objects.
171 vm = vmspace_acquire_ref(p);
175 vm_map_lock_read(map);
176 for (entry = map->header.next;
177 entry != &map->header; entry = entry->next) {
178 if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
179 (object = entry->object.vm_object) == NULL)
181 VM_OBJECT_LOCK(object);
182 vm_object_set_flag(object, OBJ_ACTIVE);
183 paging |= object->paging_in_progress;
184 VM_OBJECT_UNLOCK(object);
186 vm_map_unlock_read(map);
191 sx_sunlock(&allproc_lock);
193 * Calculate object memory usage statistics.
195 mtx_lock(&vm_object_list_mtx);
196 TAILQ_FOREACH(object, &vm_object_list, object_list) {
198 * Perform unsynchronized reads on the object to avoid
199 * a lock-order reversal. In this case, the lack of
200 * synchronization should not impair the accuracy of
201 * the reported statistics.
203 if (object->type == OBJT_DEVICE || object->type == OBJT_SG) {
205 * Devices, like /dev/mem, will badly skew our totals.
209 if (object->ref_count == 0) {
211 * Also skip unreferenced objects, including
212 * vnodes representing mounted file systems.
216 total.t_vm += object->size;
217 total.t_rm += object->resident_page_count;
218 if (object->flags & OBJ_ACTIVE) {
219 total.t_avm += object->size;
220 total.t_arm += object->resident_page_count;
222 if (object->shadow_count > 1) {
224 total.t_vmshr += object->size;
225 total.t_rmshr += object->resident_page_count;
226 if (object->flags & OBJ_ACTIVE) {
227 total.t_avmshr += object->size;
228 total.t_armshr += object->resident_page_count;
232 mtx_unlock(&vm_object_list_mtx);
233 total.t_free = cnt.v_free_count + cnt.v_cache_count;
234 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
238 * vcnt() - accumulate statistics from all cpus and the global cnt
241 * The vmmeter structure is now per-cpu as well as global. Those
242 * statistics which can be kept on a per-cpu basis (to avoid cache
243 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining
244 * statistics, such as v_free_reserved, are left in the global
247 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
250 vcnt(SYSCTL_HANDLER_ARGS)
252 int count = *(int *)arg1;
253 int offset = (char *)arg1 - (char *)&cnt;
257 struct pcpu *pcpu = pcpu_find(i);
258 count += *(int *)((char *)&pcpu->pc_cnt + offset);
260 return (SYSCTL_OUT(req, &count, sizeof(int)));
263 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
264 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
265 "System virtual memory statistics");
266 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
267 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
268 "VM meter sys stats");
269 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
270 "VM meter vm stats");
271 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
273 #define VM_STATS_SYS(var, descr) SYSCTL_PROC(_vm_stats_sys, OID_AUTO, var, \
274 (CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE), &cnt.v_swtch, 0, vcnt, \
277 VM_STATS_SYS(v_swtch, "Context switches");
278 VM_STATS_SYS(v_trap, "Traps");
279 VM_STATS_SYS(v_syscall, "System calls");
280 VM_STATS_SYS(v_intr, "Device interrupts");
281 VM_STATS_SYS(v_soft, "Software interrupts");
282 VM_STATS_SYS(v_vm_faults, "Address memory faults");
283 VM_STATS_SYS(v_cow_faults, "Copy-on-write faults");
284 VM_STATS_SYS(v_cow_optim, "Optimized COW faults")
285 VM_STATS_SYS(v_zfod, "Pages zero-filled on demand")
286 VM_STATS_SYS(v_ozfod, "Optimized zero fill pages")
287 VM_STATS_SYS(v_swapin, "Swap pager pageins")
288 VM_STATS_SYS(v_swapout, "Swap pager pageouts")
289 VM_STATS_SYS(v_swappgsin, "Swap pages swapped in")
290 VM_STATS_SYS(v_swappgsout, "Swap pages swapped out")
291 VM_STATS_SYS(v_vnodein, "Vnode pager pageins")
292 VM_STATS_SYS(v_vnodeout, "Vnode pager pageouts")
293 VM_STATS_SYS(v_vnodepgsin, "Vnode pages paged in")
294 VM_STATS_SYS(v_vnodepgsout, "Vnode pages paged out")
295 VM_STATS_SYS(v_intrans, "In transit page faults")
296 VM_STATS_SYS(v_reactivated, "Pages reactivated from free list")
297 VM_STATS_SYS(v_pdwakeups, "Pagedaemon wakeups")
298 VM_STATS_SYS(v_pdpages, "Pages analyzed by pagedaemon")
299 VM_STATS_SYS(v_tcached, "Total pages cached")
300 VM_STATS_SYS(v_dfree, "Pages freed by pagedaemon")
301 VM_STATS_SYS(v_pfree, "Pages freed by exiting processes")
302 VM_STATS_SYS(v_tfree, "Total pages freed")
303 VM_STATS_SYS(v_page_size, "Page size in bytes")
304 VM_STATS_SYS(v_page_count, "Total number of pages in system")
305 VM_STATS_SYS(v_free_reserved, "Pages reserved for deadlock")
306 VM_STATS_SYS(v_free_target, "Pages desired free")
307 VM_STATS_SYS(v_free_min, "Minimum low-free-pages threshold")
308 VM_STATS_SYS(v_free_count, "Free pages")
309 VM_STATS_SYS(v_wire_count, "Wired pages")
310 VM_STATS_SYS(v_active_count, "Active pages")
311 VM_STATS_SYS(v_inactive_target, "Desired inactive pages")
312 VM_STATS_SYS(v_inactive_count, "Inactive pages")
313 VM_STATS_SYS(v_cache_count, "Pages on cache queue")
314 VM_STATS_SYS(v_cache_min, "Min pages on cache queue")
315 VM_STATS_SYS(v_cache_max, "Max pages on cached queue")
316 VM_STATS_SYS(v_pageout_free_min, "Min pages reserved for kernel")
317 VM_STATS_SYS(v_interrupt_free_min, "Reserved pages for interrupt code")
318 VM_STATS_SYS(v_forks, "Number of fork() calls")
319 VM_STATS_SYS(v_vforks, "Number of vfork() calls")
320 VM_STATS_SYS(v_rforks, "Number of rfork() calls")
321 VM_STATS_SYS(v_kthreads, "Number of fork() calls by kernel")
322 VM_STATS_SYS(v_forkpages, "VM pages affected by fork()")
323 VM_STATS_SYS(v_vforkpages, "VM pages affected by vfork()")
324 VM_STATS_SYS(v_rforkpages, "VM pages affected by rfork()")
325 VM_STATS_SYS(v_kthreadpages, "VM pages affected by fork() by kernel")
327 SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD,
328 &vm_page_zero_count, 0, "Number of zero-ed free pages");