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("$FreeBSD$");
  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/rwlock.h>
  43 #include <sys/sx.h>
  44 #include <sys/vmmeter.h>
  45 #include <sys/smp.h>
  46
  47 #include <vm/vm.h>
  48 #include <vm/vm_page.h>
  49 #include <vm/vm_extern.h>
  50 #include <vm/vm_param.h>
  51 #include <vm/pmap.h>
  52 #include <vm/vm_map.h>
  53 #include <vm/vm_object.h>
  54 #include <sys/sysctl.h>
  55
  56 struct vmmeter cnt;
  57
  58 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
  59         CTLFLAG_RW, &cnt.v_free_min, 0, "Minimum low-free-pages threshold");
  60 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
  61         CTLFLAG_RW, &cnt.v_free_target, 0, "Desired free pages");
  62 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
  63         CTLFLAG_RW, &cnt.v_free_reserved, 0, "Pages reserved for deadlock");
  64 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
  65         CTLFLAG_RW, &cnt.v_inactive_target, 0, "Pages desired inactive");
  66 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
  67         CTLFLAG_RW, &cnt.v_cache_min, 0, "Min pages on cache queue");
  68 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
  69         CTLFLAG_RW, &cnt.v_cache_max, 0, "Max pages on cache queue");
  70 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
  71         CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
  72 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
  73         CTLFLAG_RW, &cnt.v_free_severe, 0, "Severe page depletion point");
  74
  75 static int
  76 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
  77 {
  78
  79 #ifdef SCTL_MASK32
  80         u_int32_t la[4];
  81
  82         if (req->flags & SCTL_MASK32) {
  83                 la[0] = averunnable.ldavg[0];
  84                 la[1] = averunnable.ldavg[1];
  85                 la[2] = averunnable.ldavg[2];
  86                 la[3] = averunnable.fscale;
  87                 return SYSCTL_OUT(req, la, sizeof(la));
  88         } else
  89 #endif
  90                 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
  91 }
  92 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
  93     CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
  94     "Machine loadaverage history");
  95
  96 static int
  97 vmtotal(SYSCTL_HANDLER_ARGS)
  98 {
  99         struct proc *p;
 100         struct vmtotal total;
 101         vm_map_entry_t entry;
 102         vm_object_t object;
 103         vm_map_t map;
 104         int paging;
 105         struct thread *td;
 106         struct vmspace *vm;
 107
 108         bzero(&total, sizeof(total));
 109         /*
 110          * Mark all objects as inactive.
 111          */
 112         mtx_lock(&vm_object_list_mtx);
 113         TAILQ_FOREACH(object, &vm_object_list, object_list) {
 114                 if (!VM_OBJECT_TRYWLOCK(object)) {
 115                         /*
 116                          * Avoid a lock-order reversal.  Consequently,
 117                          * the reported number of active pages may be
 118                          * greater than the actual number.
 119                          */
 120                         continue;
 121                 }
 122                 vm_object_clear_flag(object, OBJ_ACTIVE);
 123                 VM_OBJECT_WUNLOCK(object);
 124         }
 125         mtx_unlock(&vm_object_list_mtx);
 126         /*
 127          * Calculate process statistics.
 128          */
 129         sx_slock(&allproc_lock);
 130         FOREACH_PROC_IN_SYSTEM(p) {
 131                 if (p->p_flag & P_SYSTEM)
 132                         continue;
 133                 PROC_LOCK(p);
 134                 switch (p->p_state) {
 135                 case PRS_NEW:
 136                         PROC_UNLOCK(p);
 137                         continue;
 138                         break;
 139                 default:
 140                         FOREACH_THREAD_IN_PROC(p, td) {
 141                                 thread_lock(td);
 142                                 switch (td->td_state) {
 143                                 case TDS_INHIBITED:
 144                                         if (TD_IS_SWAPPED(td))
 145                                                 total.t_sw++;
 146                                         else if (TD_IS_SLEEPING(td) &&
 147                                             td->td_priority <= PZERO)
 148                                                 total.t_dw++;
 149                                         else
 150                                                 total.t_sl++;
 151                                         break;
 152
 153                                 case TDS_CAN_RUN:
 154                                         total.t_sw++;
 155                                         break;
 156                                 case TDS_RUNQ:
 157                                 case TDS_RUNNING:
 158                                         total.t_rq++;
 159                                         thread_unlock(td);
 160                                         continue;
 161                                 default:
 162                                         break;
 163                                 }
 164                                 thread_unlock(td);
 165                         }
 166                 }
 167                 PROC_UNLOCK(p);
 168                 /*
 169                  * Note active objects.
 170                  */
 171                 paging = 0;
 172                 vm = vmspace_acquire_ref(p);
 173                 if (vm == NULL)
 174                         continue;
 175                 map = &vm->vm_map;
 176                 vm_map_lock_read(map);
 177                 for (entry = map->header.next;
 178                     entry != &map->header; entry = entry->next) {
 179                         if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
 180                             (object = entry->object.vm_object) == NULL)
 181                                 continue;
 182                         VM_OBJECT_WLOCK(object);
 183                         vm_object_set_flag(object, OBJ_ACTIVE);
 184                         paging |= object->paging_in_progress;
 185                         VM_OBJECT_WUNLOCK(object);
 186                 }
 187                 vm_map_unlock_read(map);
 188                 vmspace_free(vm);
 189                 if (paging)
 190                         total.t_pw++;
 191         }
 192         sx_sunlock(&allproc_lock);
 193         /*
 194          * Calculate object memory usage statistics.
 195          */
 196         mtx_lock(&vm_object_list_mtx);
 197         TAILQ_FOREACH(object, &vm_object_list, object_list) {
 198                 /*
 199                  * Perform unsynchronized reads on the object to avoid
 200                  * a lock-order reversal.  In this case, the lack of
 201                  * synchronization should not impair the accuracy of
 202                  * the reported statistics.
 203                  */
 204                 if ((object->flags & OBJ_FICTITIOUS) != 0) {
 205                         /*
 206                          * Devices, like /dev/mem, will badly skew our totals.
 207                          */
 208                         continue;
 209                 }
 210                 if (object->ref_count == 0) {
 211                         /*
 212                          * Also skip unreferenced objects, including
 213                          * vnodes representing mounted file systems.
 214                          */
 215                         continue;
 216                 }
 217                 total.t_vm += object->size;
 218                 total.t_rm += object->resident_page_count;
 219                 if (object->flags & OBJ_ACTIVE) {
 220                         total.t_avm += object->size;
 221                         total.t_arm += object->resident_page_count;
 222                 }
 223                 if (object->shadow_count > 1) {
 224                         /* shared object */
 225                         total.t_vmshr += object->size;
 226                         total.t_rmshr += object->resident_page_count;
 227                         if (object->flags & OBJ_ACTIVE) {
 228                                 total.t_avmshr += object->size;
 229                                 total.t_armshr += object->resident_page_count;
 230                         }
 231                 }
 232         }
 233         mtx_unlock(&vm_object_list_mtx);
 234         total.t_free = cnt.v_free_count + cnt.v_cache_count;
 235         return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
 236 }
 237
 238 /*
 239  * vcnt() -     accumulate statistics from all cpus and the global cnt
 240  *              structure.
 241  *
 242  *      The vmmeter structure is now per-cpu as well as global.  Those
 243  *      statistics which can be kept on a per-cpu basis (to avoid cache
 244  *      stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
 245  *      statistics, such as v_free_reserved, are left in the global
 246  *      structure.
 247  *
 248  * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
 249  */
 250 static int
 251 vcnt(SYSCTL_HANDLER_ARGS)
 252 {
 253         int count = *(int *)arg1;
 254         int offset = (char *)arg1 - (char *)&cnt;
 255         int i;
 256
 257         CPU_FOREACH(i) {
 258                 struct pcpu *pcpu = pcpu_find(i);
 259                 count += *(int *)((char *)&pcpu->pc_cnt + offset);
 260         }
 261         return (SYSCTL_OUT(req, &count, sizeof(int)));
 262 }
 263
 264 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
 265     0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
 266     "System virtual memory statistics");
 267 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
 268 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
 269         "VM meter sys stats");
 270 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
 271         "VM meter vm stats");
 272 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
 273
 274 #define VM_STATS(parent, var, descr) \
 275         SYSCTL_PROC(parent, OID_AUTO, var, \
 276             CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &cnt.var, 0, vcnt, \
 277             "IU", descr)
 278 #define VM_STATS_VM(var, descr)         VM_STATS(_vm_stats_vm, var, descr)
 279 #define VM_STATS_SYS(var, descr)        VM_STATS(_vm_stats_sys, var, descr)
 280
 281 VM_STATS_SYS(v_swtch, "Context switches");
 282 VM_STATS_SYS(v_trap, "Traps");
 283 VM_STATS_SYS(v_syscall, "System calls");
 284 VM_STATS_SYS(v_intr, "Device interrupts");
 285 VM_STATS_SYS(v_soft, "Software interrupts");
 286 VM_STATS_VM(v_vm_faults, "Address memory faults");
 287 VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
 288 VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
 289 VM_STATS_VM(v_cow_optim, "Optimized COW faults");
 290 VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
 291 VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
 292 VM_STATS_VM(v_swapin, "Swap pager pageins");
 293 VM_STATS_VM(v_swapout, "Swap pager pageouts");
 294 VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
 295 VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
 296 VM_STATS_VM(v_vnodein, "Vnode pager pageins");
 297 VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
 298 VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
 299 VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
 300 VM_STATS_VM(v_intrans, "In transit page faults");
 301 VM_STATS_VM(v_reactivated, "Pages reactivated from free list");
 302 VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
 303 VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
 304 VM_STATS_VM(v_tcached, "Total pages cached");
 305 VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
 306 VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
 307 VM_STATS_VM(v_tfree, "Total pages freed");
 308 VM_STATS_VM(v_page_size, "Page size in bytes");
 309 VM_STATS_VM(v_page_count, "Total number of pages in system");
 310 VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock");
 311 VM_STATS_VM(v_free_target, "Pages desired free");
 312 VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold");
 313 VM_STATS_VM(v_free_count, "Free pages");
 314 VM_STATS_VM(v_wire_count, "Wired pages");
 315 VM_STATS_VM(v_active_count, "Active pages");
 316 VM_STATS_VM(v_inactive_target, "Desired inactive pages");
 317 VM_STATS_VM(v_inactive_count, "Inactive pages");
 318 VM_STATS_VM(v_cache_count, "Pages on cache queue");
 319 VM_STATS_VM(v_cache_min, "Min pages on cache queue");
 320 VM_STATS_VM(v_cache_max, "Max pages on cached queue");
 321 VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel");
 322 VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code");
 323 VM_STATS_VM(v_forks, "Number of fork() calls");
 324 VM_STATS_VM(v_vforks, "Number of vfork() calls");
 325 VM_STATS_VM(v_rforks, "Number of rfork() calls");
 326 VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
 327 VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
 328 VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
 329 VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
 330 VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
 331
 332 SYSCTL_INT(_vm_stats_misc, OID_AUTO, zero_page_count, CTLFLAG_RD,
 333         &vm_page_zero_count, 0, "Number of zero-ed free pages");