2 * Copyright (c) 1982, 1986, 1989, 1993
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
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14 * may be used to endorse or promote products derived from this software
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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29 * @(#)vm_meter.c 8.4 (Berkeley) 1/4/94
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_compat.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
41 #include <sys/malloc.h>
42 #include <sys/mutex.h>
44 #include <sys/resource.h>
45 #include <sys/rwlock.h>
47 #include <sys/vmmeter.h>
51 #include <vm/vm_page.h>
52 #include <vm/vm_extern.h>
53 #include <vm/vm_param.h>
55 #include <vm/vm_map.h>
56 #include <vm/vm_object.h>
57 #include <sys/sysctl.h>
59 struct vmmeter vm_cnt = {
60 .v_swtch = EARLY_COUNTER,
61 .v_trap = EARLY_COUNTER,
62 .v_syscall = EARLY_COUNTER,
63 .v_intr = EARLY_COUNTER,
64 .v_soft = EARLY_COUNTER,
65 .v_vm_faults = EARLY_COUNTER,
66 .v_io_faults = EARLY_COUNTER,
67 .v_cow_faults = EARLY_COUNTER,
68 .v_cow_optim = EARLY_COUNTER,
69 .v_zfod = EARLY_COUNTER,
70 .v_ozfod = EARLY_COUNTER,
71 .v_swapin = EARLY_COUNTER,
72 .v_swapout = EARLY_COUNTER,
73 .v_swappgsin = EARLY_COUNTER,
74 .v_swappgsout = EARLY_COUNTER,
75 .v_vnodein = EARLY_COUNTER,
76 .v_vnodeout = EARLY_COUNTER,
77 .v_vnodepgsin = EARLY_COUNTER,
78 .v_vnodepgsout = EARLY_COUNTER,
79 .v_intrans = EARLY_COUNTER,
80 .v_reactivated = EARLY_COUNTER,
81 .v_pdwakeups = EARLY_COUNTER,
82 .v_pdpages = EARLY_COUNTER,
83 .v_pdshortfalls = EARLY_COUNTER,
84 .v_dfree = EARLY_COUNTER,
85 .v_pfree = EARLY_COUNTER,
86 .v_tfree = EARLY_COUNTER,
87 .v_forks = EARLY_COUNTER,
88 .v_vforks = EARLY_COUNTER,
89 .v_rforks = EARLY_COUNTER,
90 .v_kthreads = EARLY_COUNTER,
91 .v_forkpages = EARLY_COUNTER,
92 .v_vforkpages = EARLY_COUNTER,
93 .v_rforkpages = EARLY_COUNTER,
94 .v_kthreadpages = EARLY_COUNTER,
98 vmcounter_startup(void)
100 counter_u64_t *cnt = (counter_u64_t *)&vm_cnt;
102 COUNTER_ARRAY_ALLOC(cnt, VM_METER_NCOUNTERS, M_WAITOK);
104 SYSINIT(counter, SI_SUB_CPU, SI_ORDER_FOURTH + 1, vmcounter_startup, NULL);
106 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
107 CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold");
108 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
109 CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages");
110 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
111 CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock");
112 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
113 CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive");
114 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
115 CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
116 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
117 CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point");
120 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
126 if (req->flags & SCTL_MASK32) {
127 la[0] = averunnable.ldavg[0];
128 la[1] = averunnable.ldavg[1];
129 la[2] = averunnable.ldavg[2];
130 la[3] = averunnable.fscale;
131 return SYSCTL_OUT(req, la, sizeof(la));
134 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
136 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
137 CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
138 "Machine loadaverage history");
141 * This function aims to determine if the object is mapped,
142 * specifically, if it is referenced by a vm_map_entry. Because
143 * objects occasionally acquire transient references that do not
144 * represent a mapping, the method used here is inexact. However, it
145 * has very low overhead and is good enough for the advisory
149 is_object_active(vm_object_t obj)
152 return (obj->ref_count > obj->shadow_count);
156 vmtotal(SYSCTL_HANDLER_ARGS)
158 struct vmtotal total;
163 bzero(&total, sizeof(total));
166 * Calculate process statistics.
168 sx_slock(&allproc_lock);
169 FOREACH_PROC_IN_SYSTEM(p) {
170 if ((p->p_flag & P_SYSTEM) != 0)
173 if (p->p_state != PRS_NEW) {
174 FOREACH_THREAD_IN_PROC(p, td) {
176 switch (td->td_state) {
178 if (TD_IS_SWAPPED(td))
180 else if (TD_IS_SLEEPING(td)) {
181 if (td->td_priority <= PZERO)
186 &vm_cnt.v_free_count)
205 sx_sunlock(&allproc_lock);
207 * Calculate object memory usage statistics.
209 mtx_lock(&vm_object_list_mtx);
210 TAILQ_FOREACH(object, &vm_object_list, object_list) {
212 * Perform unsynchronized reads on the object. In
213 * this case, the lack of synchronization should not
214 * impair the accuracy of the reported statistics.
216 if ((object->flags & OBJ_FICTITIOUS) != 0) {
218 * Devices, like /dev/mem, will badly skew our totals.
222 if (object->ref_count == 0) {
224 * Also skip unreferenced objects, including
225 * vnodes representing mounted file systems.
229 if (object->ref_count == 1 &&
230 (object->flags & OBJ_NOSPLIT) != 0) {
232 * Also skip otherwise unreferenced swap
233 * objects backing tmpfs vnodes, and POSIX or
234 * SysV shared memory.
238 total.t_vm += object->size;
239 total.t_rm += object->resident_page_count;
240 if (is_object_active(object)) {
241 total.t_avm += object->size;
242 total.t_arm += object->resident_page_count;
244 if (object->shadow_count > 1) {
246 total.t_vmshr += object->size;
247 total.t_rmshr += object->resident_page_count;
248 if (is_object_active(object)) {
249 total.t_avmshr += object->size;
250 total.t_armshr += object->resident_page_count;
254 mtx_unlock(&vm_object_list_mtx);
255 total.t_free = vm_cnt.v_free_count;
256 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
259 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
260 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
261 "System virtual memory statistics");
262 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
263 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
264 "VM meter sys stats");
265 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
266 "VM meter vm stats");
267 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
270 sysctl_handle_vmstat(SYSCTL_HANDLER_ARGS)
273 #ifdef COMPAT_FREEBSD11
277 val = counter_u64_fetch(*(counter_u64_t *)arg1);
278 #ifdef COMPAT_FREEBSD11
279 if (req->oldlen == sizeof(val32)) {
280 val32 = val; /* truncate */
281 return (SYSCTL_OUT(req, &val32, sizeof(val32)));
284 return (SYSCTL_OUT(req, &val, sizeof(val)));
287 #define VM_STATS(parent, var, descr) \
288 SYSCTL_OID(parent, OID_AUTO, var, CTLTYPE_U64 | CTLFLAG_MPSAFE | \
289 CTLFLAG_RD, &vm_cnt.var, 0, sysctl_handle_vmstat, "QU", descr);
290 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr)
291 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr)
293 VM_STATS_SYS(v_swtch, "Context switches");
294 VM_STATS_SYS(v_trap, "Traps");
295 VM_STATS_SYS(v_syscall, "System calls");
296 VM_STATS_SYS(v_intr, "Device interrupts");
297 VM_STATS_SYS(v_soft, "Software interrupts");
298 VM_STATS_VM(v_vm_faults, "Address memory faults");
299 VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
300 VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
301 VM_STATS_VM(v_cow_optim, "Optimized COW faults");
302 VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
303 VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
304 VM_STATS_VM(v_swapin, "Swap pager pageins");
305 VM_STATS_VM(v_swapout, "Swap pager pageouts");
306 VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
307 VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
308 VM_STATS_VM(v_vnodein, "Vnode pager pageins");
309 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
310 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
311 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
312 VM_STATS_VM(v_intrans, "In transit page faults");
313 VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon");
314 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
315 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
316 VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls");
317 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
318 VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
319 VM_STATS_VM(v_tfree, "Total pages freed");
320 VM_STATS_VM(v_forks, "Number of fork() calls");
321 VM_STATS_VM(v_vforks, "Number of vfork() calls");
322 VM_STATS_VM(v_rforks, "Number of rfork() calls");
323 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
324 VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
325 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
326 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
327 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
329 #define VM_STATS_UINT(var, descr) \
330 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr)
331 VM_STATS_UINT(v_page_size, "Page size in bytes");
332 VM_STATS_UINT(v_page_count, "Total number of pages in system");
333 VM_STATS_UINT(v_free_reserved, "Pages reserved for deadlock");
334 VM_STATS_UINT(v_free_target, "Pages desired free");
335 VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold");
336 VM_STATS_UINT(v_free_count, "Free pages");
337 VM_STATS_UINT(v_wire_count, "Wired pages");
338 VM_STATS_UINT(v_active_count, "Active pages");
339 VM_STATS_UINT(v_inactive_target, "Desired inactive pages");
340 VM_STATS_UINT(v_inactive_count, "Inactive pages");
341 VM_STATS_UINT(v_laundry_count, "Pages eligible for laundering");
342 VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel");
343 VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code");
344 VM_STATS_UINT(v_free_severe, "Severe page depletion point");
346 #ifdef COMPAT_FREEBSD11
348 * Provide compatibility sysctls for the benefit of old utilities which exit
349 * with an error if they cannot be found.
351 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD,
352 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
353 SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD,
354 SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");