The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_meter.c

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    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/8.0/sys/vm/vm_meter.c 195840 2009-07-24 13:50:29Z jhb $");
   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 struct vmmeter cnt;
   56 
   57 int maxslp = MAXSLP;
   58 
   59 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
   60         CTLFLAG_RW, &cnt.v_free_min, 0, "");
   61 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
   62         CTLFLAG_RW, &cnt.v_free_target, 0, "");
   63 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
   64         CTLFLAG_RW, &cnt.v_free_reserved, 0, "");
   65 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
   66         CTLFLAG_RW, &cnt.v_inactive_target, 0, "");
   67 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
   68         CTLFLAG_RW, &cnt.v_cache_min, 0, "");
   69 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
   70         CTLFLAG_RW, &cnt.v_cache_max, 0, "");
   71 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
   72         CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "");
   73 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
   74         CTLFLAG_RW, &cnt.v_free_severe, 0, "");
   75 
   76 static int
   77 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
   78 {
   79         
   80 #ifdef SCTL_MASK32
   81         u_int32_t la[4];
   82 
   83         if (req->flags & SCTL_MASK32) {
   84                 la[0] = averunnable.ldavg[0];
   85                 la[1] = averunnable.ldavg[1];
   86                 la[2] = averunnable.ldavg[2];
   87                 la[3] = averunnable.fscale;
   88                 return SYSCTL_OUT(req, la, sizeof(la));
   89         } else
   90 #endif
   91                 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
   92 }
   93 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
   94     CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
   95     "Machine loadaverage history");
   96 
   97 static int
   98 vmtotal(SYSCTL_HANDLER_ARGS)
   99 {
  100         struct proc *p;
  101         struct vmtotal total;
  102         vm_map_entry_t entry;
  103         vm_object_t object;
  104         vm_map_t map;
  105         int paging;
  106         struct thread *td;
  107         struct vmspace *vm;
  108 
  109         bzero(&total, sizeof(total));
  110         /*
  111          * Mark all objects as inactive.
  112          */
  113         mtx_lock(&vm_object_list_mtx);
  114         TAILQ_FOREACH(object, &vm_object_list, object_list) {
  115                 if (!VM_OBJECT_TRYLOCK(object)) {
  116                         /*
  117                          * Avoid a lock-order reversal.  Consequently,
  118                          * the reported number of active pages may be
  119                          * greater than the actual number.
  120                          */
  121                         continue;
  122                 }
  123                 vm_object_clear_flag(object, OBJ_ACTIVE);
  124                 VM_OBJECT_UNLOCK(object);
  125         }
  126         mtx_unlock(&vm_object_list_mtx);
  127         /*
  128          * Calculate process statistics.
  129          */
  130         sx_slock(&allproc_lock);
  131         FOREACH_PROC_IN_SYSTEM(p) {
  132                 if (p->p_flag & P_SYSTEM)
  133                         continue;
  134                 PROC_LOCK(p);
  135                 PROC_SLOCK(p);
  136                 switch (p->p_state) {
  137                 case PRS_NEW:
  138                         PROC_SUNLOCK(p);
  139                         PROC_UNLOCK(p);
  140                         continue;
  141                         break;
  142                 default:
  143                         PROC_SUNLOCK(p);
  144                         FOREACH_THREAD_IN_PROC(p, td) {
  145                                 thread_lock(td);
  146                                 switch (td->td_state) {
  147                                 case TDS_INHIBITED:
  148                                         if (TD_IS_SWAPPED(td))
  149                                                 total.t_sw++;
  150                                         else if (TD_IS_SLEEPING(td) &&
  151                                             td->td_priority <= PZERO)
  152                                                 total.t_dw++;
  153                                         else
  154                                                 total.t_sl++;
  155                                         break;
  156 
  157                                 case TDS_CAN_RUN:
  158                                         total.t_sw++;
  159                                         break;
  160                                 case TDS_RUNQ:
  161                                 case TDS_RUNNING:
  162                                         total.t_rq++;
  163                                         thread_unlock(td);
  164                                         continue;
  165                                 default:
  166                                         break;
  167                                 }
  168                                 thread_unlock(td);
  169                         }
  170                 }
  171                 PROC_UNLOCK(p);
  172                 /*
  173                  * Note active objects.
  174                  */
  175                 paging = 0;
  176                 vm = vmspace_acquire_ref(p);
  177                 if (vm == NULL)
  178                         continue;
  179                 map = &vm->vm_map;
  180                 vm_map_lock_read(map);
  181                 for (entry = map->header.next;
  182                     entry != &map->header; entry = entry->next) {
  183                         if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
  184                             (object = entry->object.vm_object) == NULL)
  185                                 continue;
  186                         VM_OBJECT_LOCK(object);
  187                         vm_object_set_flag(object, OBJ_ACTIVE);
  188                         paging |= object->paging_in_progress;
  189                         VM_OBJECT_UNLOCK(object);
  190                 }
  191                 vm_map_unlock_read(map);
  192                 vmspace_free(vm);
  193                 if (paging)
  194                         total.t_pw++;
  195         }
  196         sx_sunlock(&allproc_lock);
  197         /*
  198          * Calculate object memory usage statistics.
  199          */
  200         mtx_lock(&vm_object_list_mtx);
  201         TAILQ_FOREACH(object, &vm_object_list, object_list) {
  202                 /*
  203                  * Perform unsynchronized reads on the object to avoid
  204                  * a lock-order reversal.  In this case, the lack of
  205                  * synchronization should not impair the accuracy of
  206                  * the reported statistics. 
  207                  */
  208                 if (object->type == OBJT_DEVICE || object->type == OBJT_SG) {
  209                         /*
  210                          * Devices, like /dev/mem, will badly skew our totals.
  211                          */
  212                         continue;
  213                 }
  214                 if (object->ref_count == 0) {
  215                         /*
  216                          * Also skip unreferenced objects, including
  217                          * vnodes representing mounted file systems.
  218                          */
  219                         continue;
  220                 }
  221                 total.t_vm += object->size;
  222                 total.t_rm += object->resident_page_count;
  223                 if (object->flags & OBJ_ACTIVE) {
  224                         total.t_avm += object->size;
  225                         total.t_arm += object->resident_page_count;
  226                 }
  227                 if (object->shadow_count > 1) {
  228                         /* shared object */
  229                         total.t_vmshr += object->size;
  230                         total.t_rmshr += object->resident_page_count;
  231                         if (object->flags & OBJ_ACTIVE) {
  232                                 total.t_avmshr += object->size;
  233                                 total.t_armshr += object->resident_page_count;
  234                         }
  235                 }
  236         }
  237         mtx_unlock(&vm_object_list_mtx);
  238         total.t_free = cnt.v_free_count + cnt.v_cache_count;
  239         return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
  240 }
  241 
  242 /*
  243  * vcnt() -     accumulate statistics from all cpus and the global cnt
  244  *              structure.
  245  *
  246  *      The vmmeter structure is now per-cpu as well as global.  Those
  247  *      statistics which can be kept on a per-cpu basis (to avoid cache
  248  *      stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
  249  *      statistics, such as v_free_reserved, are left in the global
  250  *      structure.
  251  *
  252  * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
  253  */
  254 static int
  255 vcnt(SYSCTL_HANDLER_ARGS)
  256 {
  257         int count = *(int *)arg1;
  258         int offset = (char *)arg1 - (char *)&cnt;
  259 #ifdef SMP
  260         int i;
  261 
  262         for (i = 0; i < mp_ncpus; ++i) {
  263                 struct pcpu *pcpu = pcpu_find(i);
  264                 count += *(int *)((char *)&pcpu->pc_cnt + offset);
  265         }
  266 #else
  267         count += *(int *)((char *)PCPU_PTR(cnt) + offset);
  268 #endif
  269         return (SYSCTL_OUT(req, &count, sizeof(int)));
  270 }
  271 
  272 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
  273     0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 
  274     "System virtual memory statistics");
  275 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
  276 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
  277         "VM meter sys stats");
  278 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
  279         "VM meter vm stats");
  280 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
  281 
  282 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  283         &cnt.v_swtch, 0, vcnt, "IU", "Context switches");
  284 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  285         &cnt.v_trap, 0, vcnt, "IU", "Traps");
  286 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  287         &cnt.v_syscall, 0, vcnt, "IU", "Syscalls");
  288 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  289         &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts");
  290 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  291         &cnt.v_soft, 0, vcnt, "IU", "Software interrupts");
  292 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  293         &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults");
  294 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  295         &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults");
  296 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  297         &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults");
  298 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  299         &cnt.v_zfod, 0, vcnt, "IU", "Zero fill");
  300 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  301         &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill");
  302 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  303         &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations");
  304 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  305         &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations");
  306 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  307         &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages");
  308 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  309         &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages");
  310 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  311         &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations");
  312 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  313         &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations");
  314 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  315         &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages");
  316 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  317         &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages");
  318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  319         &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking");
  320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  321         &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages");
  322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  323         &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups");
  324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  325         &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans");
  326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tcached, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  327         &cnt.v_tcached, 0, vcnt, "IU", "Total pages cached");
  328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  329         &cnt.v_dfree, 0, vcnt, "IU", "");
  330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  331         &cnt.v_pfree, 0, vcnt, "IU", "");
  332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  333         &cnt.v_tfree, 0, vcnt, "IU", "");
  334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  335         &cnt.v_page_size, 0, vcnt, "IU", "");
  336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  337         &cnt.v_page_count, 0, vcnt, "IU", "");
  338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  339         &cnt.v_free_reserved, 0, vcnt, "IU", "");
  340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  341         &cnt.v_free_target, 0, vcnt, "IU", "");
  342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  343         &cnt.v_free_min, 0, vcnt, "IU", "");
  344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  345         &cnt.v_free_count, 0, vcnt, "IU", "");
  346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  347         &cnt.v_wire_count, 0, vcnt, "IU", "");
  348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  349         &cnt.v_active_count, 0, vcnt, "IU", "");
  350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  351         &cnt.v_inactive_target, 0, vcnt, "IU", "");
  352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  353         &cnt.v_inactive_count, 0, vcnt, "IU", "");
  354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  355         &cnt.v_cache_count, 0, vcnt, "IU", "");
  356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  357         &cnt.v_cache_min, 0, vcnt, "IU", "");
  358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  359         &cnt.v_cache_max, 0, vcnt, "IU", "");
  360 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  361         &cnt.v_pageout_free_min, 0, vcnt, "IU", "");
  362 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  363         &cnt.v_interrupt_free_min, 0, vcnt, "IU", "");
  364 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  365         &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls");
  366 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  367         &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls");
  368 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  369         &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls");
  370 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  371         &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel");
  372 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  373         &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()");
  374 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  375         &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()");
  376 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  377         &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()");
  378 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD|CTLFLAG_MPSAFE,
  379         &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel");
  380 
  381 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
  382         zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");

Cache object: ada59bbe64a0a07e05b97c483585bff6


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