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/6.4/sys/vm/vm_meter.c 164555 2006-11-23 11:19:31Z ru $");
   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 #if !defined(__arm__) && !defined(__powerpc__)
   59 int debug_mpsafevm = 1;
   60 #else
   61 int debug_mpsafevm;
   62 #endif
   63 TUNABLE_INT("debug.mpsafevm", &debug_mpsafevm);
   64 SYSCTL_INT(_debug, OID_AUTO, mpsafevm, CTLFLAG_RD, &debug_mpsafevm, 0,
   65     "Enable/disable MPSAFE virtual memory support");
   66 
   67 struct vmmeter cnt;
   68 
   69 int maxslp = MAXSLP;
   70 
   71 SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
   72         CTLFLAG_RW, &cnt.v_free_min, 0, "");
   73 SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
   74         CTLFLAG_RW, &cnt.v_free_target, 0, "");
   75 SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
   76         CTLFLAG_RW, &cnt.v_free_reserved, 0, "");
   77 SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
   78         CTLFLAG_RW, &cnt.v_inactive_target, 0, "");
   79 SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
   80         CTLFLAG_RW, &cnt.v_cache_min, 0, "");
   81 SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
   82         CTLFLAG_RW, &cnt.v_cache_max, 0, "");
   83 SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
   84         CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "");
   85 SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
   86         CTLFLAG_RW, &cnt.v_free_severe, 0, "");
   87 
   88 static int
   89 sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
   90 {
   91 #ifdef SCTL_MASK32
   92         u_int32_t la[4];
   93 
   94         if (req->flags & SCTL_MASK32) {
   95                 la[0] = averunnable.ldavg[0];
   96                 la[1] = averunnable.ldavg[1];
   97                 la[2] = averunnable.ldavg[2];
   98                 la[3] = averunnable.fscale;
   99                 return SYSCTL_OUT(req, la, sizeof(la));
  100         } else
  101 #endif
  102                 return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
  103 }
  104 SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT|CTLFLAG_RD, 
  105     NULL, 0, sysctl_vm_loadavg, "S,loadavg", "Machine loadaverage history");
  106 
  107 static int
  108 vmtotal(SYSCTL_HANDLER_ARGS)
  109 {
  110 /* XXXKSE almost completely broken */
  111         struct proc *p;
  112         struct vmtotal total;
  113         vm_map_entry_t entry;
  114         vm_object_t object;
  115         vm_map_t map;
  116         int paging;
  117         struct thread *td;
  118         struct vmspace *vm;
  119 
  120         bzero(&total, sizeof(total));
  121         /*
  122          * Mark all objects as inactive.
  123          */
  124         GIANT_REQUIRED;
  125         mtx_lock(&vm_object_list_mtx);
  126         TAILQ_FOREACH(object, &vm_object_list, object_list) {
  127                 if (!VM_OBJECT_TRYLOCK(object)) {
  128                         /*
  129                          * Avoid a lock-order reversal.  Consequently,
  130                          * the reported number of active pages may be
  131                          * greater than the actual number.
  132                          */
  133                         continue;
  134                 }
  135                 vm_object_clear_flag(object, OBJ_ACTIVE);
  136                 VM_OBJECT_UNLOCK(object);
  137         }
  138         mtx_unlock(&vm_object_list_mtx);
  139         /*
  140          * Calculate process statistics.
  141          */
  142         sx_slock(&allproc_lock);
  143         FOREACH_PROC_IN_SYSTEM(p) {
  144                 if (p->p_flag & P_SYSTEM)
  145                         continue;
  146                 mtx_lock_spin(&sched_lock);
  147                 switch (p->p_state) {
  148                 case PRS_NEW:
  149                         mtx_unlock_spin(&sched_lock);
  150                         continue;
  151                         break;
  152                 default:
  153                         FOREACH_THREAD_IN_PROC(p, td) {
  154                                 /* Need new statistics  XXX */
  155                                 switch (td->td_state) {
  156                                 case TDS_INHIBITED:
  157                                         if (TD_ON_LOCK(td) ||
  158                                             (td->td_inhibitors ==
  159                                             TDI_SWAPPED)) {
  160                                                 total.t_sw++;
  161                                         } else if (TD_IS_SLEEPING(td) ||
  162                                            TD_AWAITING_INTR(td) ||
  163                                            TD_IS_SUSPENDED(td)) {
  164                                                 if (td->td_priority <= PZERO)
  165                                                         total.t_dw++;
  166                                                 else
  167                                                         total.t_sl++;
  168                                         }
  169                                         break;
  170 
  171                                 case TDS_CAN_RUN:
  172                                         total.t_sw++;
  173                                         break;
  174                                 case TDS_RUNQ:
  175                                 case TDS_RUNNING:
  176                                         total.t_rq++;
  177                                         continue;
  178                                 default:
  179                                         break;
  180                                 }
  181                         }
  182                 }
  183                 mtx_unlock_spin(&sched_lock);
  184                 /*
  185                  * Note active objects.
  186                  */
  187                 paging = 0;
  188                 vm = vmspace_acquire_ref(p);
  189                 if (vm == NULL)
  190                         continue;
  191                 map = &vm->vm_map;
  192                 vm_map_lock_read(map);
  193                 for (entry = map->header.next;
  194                     entry != &map->header; entry = entry->next) {
  195                         if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
  196                             (object = entry->object.vm_object) == NULL)
  197                                 continue;
  198                         VM_OBJECT_LOCK(object);
  199                         vm_object_set_flag(object, OBJ_ACTIVE);
  200                         paging |= object->paging_in_progress;
  201                         VM_OBJECT_UNLOCK(object);
  202                 }
  203                 vm_map_unlock_read(map);
  204                 vmspace_free(vm);
  205                 if (paging)
  206                         total.t_pw++;
  207         }
  208         sx_sunlock(&allproc_lock);
  209         /*
  210          * Calculate object memory usage statistics.
  211          */
  212         mtx_lock(&vm_object_list_mtx);
  213         TAILQ_FOREACH(object, &vm_object_list, object_list) {
  214                 /*
  215                  * Perform unsynchronized reads on the object to avoid
  216                  * a lock-order reversal.  In this case, the lack of
  217                  * synchronization should not impair the accuracy of
  218                  * the reported statistics. 
  219                  */
  220                 if (object->type == OBJT_DEVICE) {
  221                         /*
  222                          * Devices, like /dev/mem, will badly skew our totals.
  223                          */
  224                         continue;
  225                 }
  226                 if (object->ref_count == 0) {
  227                         /*
  228                          * Also skip unreferenced objects, including
  229                          * vnodes representing mounted file systems.
  230                          */
  231                         continue;
  232                 }
  233                 total.t_vm += object->size;
  234                 total.t_rm += object->resident_page_count;
  235                 if (object->flags & OBJ_ACTIVE) {
  236                         total.t_avm += object->size;
  237                         total.t_arm += object->resident_page_count;
  238                 }
  239                 if (object->shadow_count > 1) {
  240                         /* shared object */
  241                         total.t_vmshr += object->size;
  242                         total.t_rmshr += object->resident_page_count;
  243                         if (object->flags & OBJ_ACTIVE) {
  244                                 total.t_avmshr += object->size;
  245                                 total.t_armshr += object->resident_page_count;
  246                         }
  247                 }
  248         }
  249         mtx_unlock(&vm_object_list_mtx);
  250         total.t_free = cnt.v_free_count + cnt.v_cache_count;
  251         return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
  252 }
  253 
  254 /*
  255  * vcnt() -     accumulate statistics from all cpus and the global cnt
  256  *              structure.
  257  *
  258  *      The vmmeter structure is now per-cpu as well as global.  Those
  259  *      statistics which can be kept on a per-cpu basis (to avoid cache
  260  *      stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
  261  *      statistics, such as v_free_reserved, are left in the global
  262  *      structure.
  263  *
  264  * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
  265  */
  266 static int
  267 vcnt(SYSCTL_HANDLER_ARGS)
  268 {
  269         int count = *(int *)arg1;
  270         int offset = (char *)arg1 - (char *)&cnt;
  271 #ifdef SMP
  272         int i;
  273 
  274         for (i = 0; i < mp_ncpus; ++i) {
  275                 struct pcpu *pcpu = pcpu_find(i);
  276                 count += *(int *)((char *)&pcpu->pc_cnt + offset);
  277         }
  278 #else
  279         count += *(int *)((char *)PCPU_PTR(cnt) + offset);
  280 #endif
  281         return (SYSCTL_OUT(req, &count, sizeof(int)));
  282 }
  283 
  284 SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
  285     0, sizeof(struct vmtotal), vmtotal, "S,vmtotal", 
  286     "System virtual memory statistics");
  287 SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
  288 static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
  289         "VM meter sys stats");
  290 static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
  291         "VM meter vm stats");
  292 SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
  293 
  294 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
  295         &cnt.v_swtch, 0, vcnt, "IU", "Context switches");
  296 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
  297         &cnt.v_trap, 0, vcnt, "IU", "Traps");
  298 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
  299         &cnt.v_syscall, 0, vcnt, "IU", "Syscalls");
  300 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
  301         &cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts");
  302 SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
  303         &cnt.v_soft, 0, vcnt, "IU", "Software interrupts");
  304 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
  305         &cnt.v_vm_faults, 0, vcnt, "IU", "VM faults");
  306 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
  307         &cnt.v_cow_faults, 0, vcnt, "IU", "COW faults");
  308 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
  309         &cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults");
  310 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
  311         &cnt.v_zfod, 0, vcnt, "IU", "Zero fill");
  312 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
  313         &cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill");
  314 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
  315         &cnt.v_swapin, 0, vcnt, "IU", "Swapin operations");
  316 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
  317         &cnt.v_swapout, 0, vcnt, "IU", "Swapout operations");
  318 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
  319         &cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages");
  320 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
  321         &cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages");
  322 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
  323         &cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations");
  324 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
  325         &cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations");
  326 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
  327         &cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages");
  328 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
  329         &cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages");
  330 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
  331         &cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking");
  332 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
  333         &cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages");
  334 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
  335         &cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups");
  336 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
  337         &cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans");
  338 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
  339         &cnt.v_dfree, 0, vcnt, "IU", "");
  340 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
  341         &cnt.v_pfree, 0, vcnt, "IU", "");
  342 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
  343         &cnt.v_tfree, 0, vcnt, "IU", "");
  344 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD,
  345         &cnt.v_page_size, 0, vcnt, "IU", "");
  346 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD,
  347         &cnt.v_page_count, 0, vcnt, "IU", "");
  348 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD,
  349         &cnt.v_free_reserved, 0, vcnt, "IU", "");
  350 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD,
  351         &cnt.v_free_target, 0, vcnt, "IU", "");
  352 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD,
  353         &cnt.v_free_min, 0, vcnt, "IU", "");
  354 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD,
  355         &cnt.v_free_count, 0, vcnt, "IU", "");
  356 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD,
  357         &cnt.v_wire_count, 0, vcnt, "IU", "");
  358 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD,
  359         &cnt.v_active_count, 0, vcnt, "IU", "");
  360 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD,
  361         &cnt.v_inactive_target, 0, vcnt, "IU", "");
  362 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD,
  363         &cnt.v_inactive_count, 0, vcnt, "IU", "");
  364 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD,
  365         &cnt.v_cache_count, 0, vcnt, "IU", "");
  366 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD,
  367         &cnt.v_cache_min, 0, vcnt, "IU", "");
  368 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD,
  369         &cnt.v_cache_max, 0, vcnt, "IU", "");
  370 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD,
  371         &cnt.v_pageout_free_min, 0, vcnt, "IU", "");
  372 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD,
  373         &cnt.v_interrupt_free_min, 0, vcnt, "IU", "");
  374 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
  375         &cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls");
  376 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
  377         &cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls");
  378 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
  379         &cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls");
  380 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
  381         &cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel");
  382 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
  383         &cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()");
  384 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
  385         &cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()");
  386 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
  387         &cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()");
  388 SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
  389         &cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel");
  390 
  391 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
  392         zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");
  393 #if 0
  394 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
  395         page_mask, CTLFLAG_RD, &page_mask, 0, "");
  396 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
  397         page_shift, CTLFLAG_RD, &page_shift, 0, "");
  398 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
  399         first_page, CTLFLAG_RD, &first_page, 0, "");
  400 SYSCTL_INT(_vm_stats_misc, OID_AUTO,
  401         last_page, CTLFLAG_RD, &last_page, 0, "");
  402 #endif

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