FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_meter.c
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: releng/5.3/sys/vm/vm_meter.c 133807 2004-08-16 06:16:12Z alc $");
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/sx.h>
43 #include <sys/vmmeter.h>
44 #include <sys/smp.h>
45
46 #include <vm/vm.h>
47 #include <vm/vm_page.h>
48 #include <vm/vm_extern.h>
49 #include <vm/vm_param.h>
50 #include <vm/pmap.h>
51 #include <vm/vm_map.h>
52 #include <vm/vm_object.h>
53 #include <sys/sysctl.h>
54
55 /*
56 * Virtual memory MPSAFE temporary workarounds.
57 */
58 int debug_mpsafevm;
59 TUNABLE_INT("debug.mpsafevm", &debug_mpsafevm);
60 SYSCTL_INT(_debug, OID_AUTO, mpsafevm, CTLFLAG_RD, &debug_mpsafevm, 0,
61 "Enable/disable MPSAFE virtual memory support");
62
63 struct vmmeter cnt;
64
65 int maxslp = MAXSLP;
66
67 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
68 CTLFLAG_RW, &cnt.v_free_min, 0, "");
69 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
70 CTLFLAG_RW, &cnt.v_free_target, 0, "");
71 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
72 CTLFLAG_RW, &cnt.v_free_reserved, 0, "");
73 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
74 CTLFLAG_RW, &cnt.v_inactive_target, 0, "");
75 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
76 CTLFLAG_RW, &cnt.v_cache_min, 0, "");
77 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
78 CTLFLAG_RW, &cnt.v_cache_max, 0, "");
79 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
80 CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "");
81 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
82 CTLFLAG_RW, &cnt.v_free_severe, 0, "");
83
84 SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD,
85 &averunnable, loadavg, "Machine loadaverage history");
86
87 static int
88 vmtotal(SYSCTL_HANDLER_ARGS)
89 {
90 /* XXXKSE almost completely broken */
91 struct proc *p;
92 struct vmtotal total, *totalp;
93 vm_map_entry_t entry;
94 vm_object_t object;
95 vm_map_t map;
96 int paging;
97 struct thread *td;
98
99 totalp = &total;
100 bzero(totalp, sizeof *totalp);
101 /*
102 * Mark all objects as inactive.
103 */
104 GIANT_REQUIRED;
105 mtx_lock(&vm_object_list_mtx);
106 TAILQ_FOREACH(object, &vm_object_list, object_list) {
107 if (!VM_OBJECT_TRYLOCK(object)) {
108 /*
109 * Avoid a lock-order reversal. Consequently,
110 * the reported number of active pages may be
111 * greater than the actual number.
112 */
113 continue;
114 }
115 vm_object_clear_flag(object, OBJ_ACTIVE);
116 VM_OBJECT_UNLOCK(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 mtx_lock_spin(&sched_lock);
127 switch (p->p_state) {
128 case PRS_NEW:
129 mtx_unlock_spin(&sched_lock);
130 continue;
131 break;
132 default:
133 FOREACH_THREAD_IN_PROC(p, td) {
134 /* Need new statistics XXX */
135 switch (td->td_state) {
136 case TDS_INHIBITED:
137 if (TD_ON_LOCK(td) ||
138 (td->td_inhibitors ==
139 TDI_SWAPPED)) {
140 totalp->t_sw++;
141 } else if (TD_IS_SLEEPING(td) ||
142 TD_AWAITING_INTR(td) ||
143 TD_IS_SUSPENDED(td)) {
144 if (td->td_priority <= PZERO)
145 totalp->t_dw++;
146 else
147 totalp->t_sl++;
148 }
149 break;
150
151 case TDS_CAN_RUN:
152 totalp->t_sw++;
153 break;
154 case TDS_RUNQ:
155 case TDS_RUNNING:
156 totalp->t_rq++;
157 continue;
158 default:
159 break;
160 }
161 }
162 }
163 mtx_unlock_spin(&sched_lock);
164 /*
165 * Note active objects.
166 */
167 paging = 0;
168 map = &p->p_vmspace->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_LOCK(object);
176 vm_object_set_flag(object, OBJ_ACTIVE);
177 paging |= object->paging_in_progress;
178 VM_OBJECT_UNLOCK(object);
179 }
180 vm_map_unlock_read(map);
181 if (paging)
182 totalp->t_pw++;
183 }
184 sx_sunlock(&allproc_lock);
185 /*
186 * Calculate object memory usage statistics.
187 */
188 mtx_lock(&vm_object_list_mtx);
189 TAILQ_FOREACH(object, &vm_object_list, object_list) {
190 /*
191 * Perform unsynchronized reads on the object to avoid
192 * a lock-order reversal. In this case, the lack of
193 * synchronization should not impair the accuracy of
194 * the reported statistics.
195 */
196 if (object->type == OBJT_DEVICE) {
197 /*
198 * Devices, like /dev/mem, will badly skew our totals.
199 */
200 continue;
201 }
202 totalp->t_vm += object->size;
203 totalp->t_rm += object->resident_page_count;
204 if (object->flags & OBJ_ACTIVE) {
205 totalp->t_avm += object->size;
206 totalp->t_arm += object->resident_page_count;
207 }
208 if (object->shadow_count > 1) {
209 /* shared object */
210 totalp->t_vmshr += object->size;
211 totalp->t_rmshr += object->resident_page_count;
212 if (object->flags & OBJ_ACTIVE) {
213 totalp->t_avmshr += object->size;
214 totalp->t_armshr += object->resident_page_count;
215 }
216 }
217 }
218 mtx_unlock(&vm_object_list_mtx);
219 totalp->t_free = cnt.v_free_count + cnt.v_cache_count;
220 return (sysctl_handle_opaque(oidp, totalp, sizeof total, req));
221 }
222
223 /*
224 * vcnt() - accumulate statistics from all cpus and the global cnt
225 * structure.
226 *
227 * The vmmeter structure is now per-cpu as well as global. Those
228 * statistics which can be kept on a per-cpu basis (to avoid cache
229 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining
230 * statistics, such as v_free_reserved, are left in the global
231 * structure.
232 *
233 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
234 */
235 static int
236 vcnt(SYSCTL_HANDLER_ARGS)
237 {
238 int error = 0;
239 int count = *(int *)arg1;
240 #ifdef SMP
241 int i;
242 int offset = (char *)arg1 - (char *)&cnt;
243
244 for (i = 0; i < mp_ncpus; ++i) {
245 struct pcpu *pcpu = pcpu_find(i);
246 count += *(int *)((char *)&pcpu->pc_cnt + offset);
247 }
248 #else
249 int offset = (char *)arg1 - (char *)&cnt;
250 count += *(int *)((char *)PCPU_PTR(cnt) + offset);
251 #endif
252 error = SYSCTL_OUT(req, &count, sizeof(int));
253 return(error);
254 }
255
256 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
257 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
258 "System virtual memory statistics");
259 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
260 SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
261 SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats");
262 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
263
264 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
265 &cnt.v_swtch, 0, vcnt, "IU", "Context switches");
266 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
267 &cnt.v_trap, 0, vcnt, "IU", "Traps");
268 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
269 &cnt.v_syscall, 0, vcnt, "IU", "Syscalls");
270 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
271 &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts");
272 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
273 &cnt.v_soft, 0, vcnt, "IU", "Software interrupts");
274 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
275 &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults");
276 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
277 &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults");
278 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
279 &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults");
280 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
281 &cnt.v_zfod, 0, vcnt, "IU", "Zero fill");
282 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
283 &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill");
284 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
285 &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations");
286 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
287 &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations");
288 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
289 &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages");
290 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
291 &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages");
292 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
293 &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations");
294 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
295 &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations");
296 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
297 &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages");
298 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
299 &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages");
300 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
301 &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking");
302 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
303 &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages");
304 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
305 &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups");
306 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
307 &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans");
308 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
309 &cnt.v_dfree, 0, vcnt, "IU", "");
310 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
311 &cnt.v_pfree, 0, vcnt, "IU", "");
312 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
313 &cnt.v_tfree, 0, vcnt, "IU", "");
314 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD,
315 &cnt.v_page_size, 0, vcnt, "IU", "");
316 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD,
317 &cnt.v_page_count, 0, vcnt, "IU", "");
318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD,
319 &cnt.v_free_reserved, 0, vcnt, "IU", "");
320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD,
321 &cnt.v_free_target, 0, vcnt, "IU", "");
322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD,
323 &cnt.v_free_min, 0, vcnt, "IU", "");
324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD,
325 &cnt.v_free_count, 0, vcnt, "IU", "");
326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD,
327 &cnt.v_wire_count, 0, vcnt, "IU", "");
328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD,
329 &cnt.v_active_count, 0, vcnt, "IU", "");
330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD,
331 &cnt.v_inactive_target, 0, vcnt, "IU", "");
332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD,
333 &cnt.v_inactive_count, 0, vcnt, "IU", "");
334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD,
335 &cnt.v_cache_count, 0, vcnt, "IU", "");
336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD,
337 &cnt.v_cache_min, 0, vcnt, "IU", "");
338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD,
339 &cnt.v_cache_max, 0, vcnt, "IU", "");
340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD,
341 &cnt.v_pageout_free_min, 0, vcnt, "IU", "");
342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD,
343 &cnt.v_interrupt_free_min, 0, vcnt, "IU", "");
344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
345 &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls");
346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
347 &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls");
348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
349 &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls");
350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
351 &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel");
352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
353 &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()");
354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
355 &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()");
356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
357 &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()");
358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
359 &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel");
360
361 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
362 zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");
363 #if 0
364 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
365 page_mask, CTLFLAG_RD, &page_mask, 0, "");
366 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
367 page_shift, CTLFLAG_RD, &page_shift, 0, "");
368 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
369 first_page, CTLFLAG_RD, &first_page, 0, "");
370 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
371 last_page, CTLFLAG_RD, &last_page, 0, "");
372 #endif
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