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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>
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 * This function aims to determine if the object is mapped,
94 * specifically, if it is referenced by a vm_map_entry. Because
95 * objects occasionally acquire transient references that do not
96 * represent a mapping, the method used here is inexact. However, it
97 * has very low overhead and is good enough for the advisory
101 is_object_active(vm_object_t obj)
104 return (obj->ref_count > obj->shadow_count);
108 vmtotal(SYSCTL_HANDLER_ARGS)
110 struct vmtotal total;
115 bzero(&total, sizeof(total));
118 * Calculate process statistics.
120 sx_slock(&allproc_lock);
121 FOREACH_PROC_IN_SYSTEM(p) {
122 if (p->p_flag & P_SYSTEM)
125 switch (p->p_state) {
131 FOREACH_THREAD_IN_PROC(p, td) {
133 switch (td->td_state) {
135 if (TD_IS_SWAPPED(td))
137 else if (TD_IS_SLEEPING(td)) {
138 if (td->td_priority <= PZERO)
143 &vm_cnt.v_free_count)
164 sx_sunlock(&allproc_lock);
166 * Calculate object memory usage statistics.
168 mtx_lock(&vm_object_list_mtx);
169 TAILQ_FOREACH(object, &vm_object_list, object_list) {
171 * Perform unsynchronized reads on the object. In
172 * this case, the lack of synchronization should not
173 * impair the accuracy of the reported statistics.
175 if ((object->flags & OBJ_FICTITIOUS) != 0) {
177 * Devices, like /dev/mem, will badly skew our totals.
181 if (object->ref_count == 0) {
183 * Also skip unreferenced objects, including
184 * vnodes representing mounted file systems.
188 if (object->ref_count == 1 &&
189 (object->flags & OBJ_NOSPLIT) != 0) {
191 * Also skip otherwise unreferenced swap
192 * objects backing tmpfs vnodes, and POSIX or
193 * SysV shared memory.
197 total.t_vm += object->size;
198 total.t_rm += object->resident_page_count;
199 if (is_object_active(object)) {
200 total.t_avm += object->size;
201 total.t_arm += object->resident_page_count;
203 if (object->shadow_count > 1) {
205 total.t_vmshr += object->size;
206 total.t_rmshr += object->resident_page_count;
207 if (is_object_active(object)) {
208 total.t_avmshr += object->size;
209 total.t_armshr += object->resident_page_count;
213 mtx_unlock(&vm_object_list_mtx);
214 total.t_free = vm_cnt.v_free_count + vm_cnt.v_cache_count;
215 return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
219 * vcnt() - accumulate statistics from all cpus and the global cnt
222 * The vmmeter structure is now per-cpu as well as global. Those
223 * statistics which can be kept on a per-cpu basis (to avoid cache
224 * stalls between cpus) can be moved to the per-cpu vmmeter. Remaining
225 * statistics, such as v_free_reserved, are left in the global
228 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
231 vcnt(SYSCTL_HANDLER_ARGS)
233 int count = *(int *)arg1;
234 int offset = (char *)arg1 - (char *)&vm_cnt;
238 struct pcpu *pcpu = pcpu_find(i);
239 count += *(int *)((char *)&pcpu->pc_cnt + offset);
241 return (SYSCTL_OUT(req, &count, sizeof(int)));
244 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
245 0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
246 "System virtual memory statistics");
247 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
248 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
249 "VM meter sys stats");
250 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
251 "VM meter vm stats");
252 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
254 #define VM_STATS(parent, var, descr) \
255 SYSCTL_PROC(parent, OID_AUTO, var, \
256 CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, vcnt, \
258 #define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr)
259 #define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr)
261 VM_STATS_SYS(v_swtch, "Context switches");
262 VM_STATS_SYS(v_trap, "Traps");
263 VM_STATS_SYS(v_syscall, "System calls");
264 VM_STATS_SYS(v_intr, "Device interrupts");
265 VM_STATS_SYS(v_soft, "Software interrupts");
266 VM_STATS_VM(v_vm_faults, "Address memory faults");
267 VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
268 VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
269 VM_STATS_VM(v_cow_optim, "Optimized COW faults");
270 VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
271 VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
272 VM_STATS_VM(v_swapin, "Swap pager pageins");
273 VM_STATS_VM(v_swapout, "Swap pager pageouts");
274 VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
275 VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
276 VM_STATS_VM(v_vnodein, "Vnode pager pageins");
277 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
278 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
279 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
280 VM_STATS_VM(v_intrans, "In transit page faults");
281 VM_STATS_VM(v_reactivated, "Pages reactivated from free list");
282 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
283 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
284 VM_STATS_VM(v_tcached, "Total pages cached");
285 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
286 VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
287 VM_STATS_VM(v_tfree, "Total pages freed");
288 VM_STATS_VM(v_page_size, "Page size in bytes");
289 VM_STATS_VM(v_page_count, "Total number of pages in system");
290 VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock");
291 VM_STATS_VM(v_free_target, "Pages desired free");
292 VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold");
293 VM_STATS_VM(v_free_count, "Free pages");
294 VM_STATS_VM(v_wire_count, "Wired pages");
295 VM_STATS_VM(v_active_count, "Active pages");
296 VM_STATS_VM(v_inactive_target, "Desired inactive pages");
297 VM_STATS_VM(v_inactive_count, "Inactive pages");
298 VM_STATS_VM(v_cache_count, "Pages on cache queue");
299 VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel");
300 VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code");
301 VM_STATS_VM(v_forks, "Number of fork() calls");
302 VM_STATS_VM(v_vforks, "Number of vfork() calls");
303 VM_STATS_VM(v_rforks, "Number of rfork() calls");
304 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
305 VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
306 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
307 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
308 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
310 SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD,
311 &vm_page_zero_count, 0, "Number of zero-ed free pages");