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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)vm_meter.c  8.4 (Berkeley) 1/4/94
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/vm/vm_meter.c 338278 2018-08-23 21:03:45Z markj $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mutex.h>
    #include <sys/proc.h>
    #include <sys/resource.h>
    #include <sys/rwlock.h>
    #include <sys/sx.h>
    #include <sys/vmmeter.h>
    #include <sys/smp.h>
    
    #include <vm/vm.h>
    #include <vm/vm_page.h>
    #include <vm/vm_extern.h>
    #include <vm/vm_param.h>
    #include <vm/vm_phys.h>
    #include <vm/vm_pagequeue.h>
    #include <vm/pmap.h>
    #include <vm/vm_map.h>
    #include <vm/vm_object.h>
    #include <sys/sysctl.h>
    
    struct vmmeter __read_mostly vm_cnt = {
            .v_swtch = EARLY_COUNTER,
            .v_trap = EARLY_COUNTER,
            .v_syscall = EARLY_COUNTER,
            .v_intr = EARLY_COUNTER,
            .v_soft = EARLY_COUNTER,
            .v_vm_faults = EARLY_COUNTER,
            .v_io_faults = EARLY_COUNTER,
            .v_cow_faults = EARLY_COUNTER,
            .v_cow_optim = EARLY_COUNTER,
            .v_zfod = EARLY_COUNTER,
            .v_ozfod = EARLY_COUNTER,
            .v_swapin = EARLY_COUNTER,
            .v_swapout = EARLY_COUNTER,
            .v_swappgsin = EARLY_COUNTER,
            .v_swappgsout = EARLY_COUNTER,
            .v_vnodein = EARLY_COUNTER,
            .v_vnodeout = EARLY_COUNTER,
            .v_vnodepgsin = EARLY_COUNTER,
            .v_vnodepgsout = EARLY_COUNTER,
            .v_intrans = EARLY_COUNTER,
            .v_reactivated = EARLY_COUNTER,
            .v_pdwakeups = EARLY_COUNTER,
            .v_pdpages = EARLY_COUNTER,
            .v_pdshortfalls = EARLY_COUNTER,
            .v_dfree = EARLY_COUNTER,
            .v_pfree = EARLY_COUNTER,
            .v_tfree = EARLY_COUNTER,
            .v_forks = EARLY_COUNTER,
            .v_vforks = EARLY_COUNTER,
            .v_rforks = EARLY_COUNTER,
            .v_kthreads = EARLY_COUNTER,
            .v_forkpages = EARLY_COUNTER,
            .v_vforkpages = EARLY_COUNTER,
            .v_rforkpages = EARLY_COUNTER,
            .v_kthreadpages = EARLY_COUNTER,
            .v_wire_count = EARLY_COUNTER,
    };
    
   static void
   vmcounter_startup(void)
   {
           counter_u64_t *cnt = (counter_u64_t *)&vm_cnt;
   
           COUNTER_ARRAY_ALLOC(cnt, VM_METER_NCOUNTERS, M_WAITOK);
   }
   SYSINIT(counter, SI_SUB_KMEM, SI_ORDER_FIRST, vmcounter_startup, NULL);
   
   SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
           CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold");
   SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
           CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages");
   SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
           CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock");
   SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
           CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive");
   SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
           CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
   SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
           CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point");
   
   static int
   sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
   {
           
   #ifdef SCTL_MASK32
           u_int32_t la[4];
   
           if (req->flags & SCTL_MASK32) {
                   la[0] = averunnable.ldavg[0];
                   la[1] = averunnable.ldavg[1];
                   la[2] = averunnable.ldavg[2];
                   la[3] = averunnable.fscale;
                   return SYSCTL_OUT(req, la, sizeof(la));
           } else
   #endif
                   return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
   }
   SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
       CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
       "Machine loadaverage history");
   
   /*
    * This function aims to determine if the object is mapped,
    * specifically, if it is referenced by a vm_map_entry.  Because
    * objects occasionally acquire transient references that do not
    * represent a mapping, the method used here is inexact.  However, it
    * has very low overhead and is good enough for the advisory
    * vm.vmtotal sysctl.
    */
   static bool
   is_object_active(vm_object_t obj)
   {
   
           return (obj->ref_count > obj->shadow_count);
   }
   
   #if defined(COMPAT_FREEBSD11)
   struct vmtotal11 {
           int16_t t_rq;
           int16_t t_dw;
           int16_t t_pw;
           int16_t t_sl;
           int16_t t_sw;
           int32_t t_vm;
           int32_t t_avm;
           int32_t t_rm;
           int32_t t_arm;
           int32_t t_vmshr;
           int32_t t_avmshr;
           int32_t t_rmshr;
           int32_t t_armshr;
           int32_t t_free;
   };
   #endif
   
   static int
   vmtotal(SYSCTL_HANDLER_ARGS)
   {
           struct vmtotal total;
   #if defined(COMPAT_FREEBSD11)
           struct vmtotal11 total11;
   #endif
           vm_object_t object;
           struct proc *p;
           struct thread *td;
   
           if (req->oldptr == NULL) {
   #if defined(COMPAT_FREEBSD11)
                   if (curproc->p_osrel < P_OSREL_VMTOTAL64)
                           return (SYSCTL_OUT(req, NULL, sizeof(total11)));
   #endif
                   return (SYSCTL_OUT(req, NULL, sizeof(total)));
           }
           bzero(&total, sizeof(total));
   
           /*
            * Calculate process statistics.
            */
           sx_slock(&allproc_lock);
           FOREACH_PROC_IN_SYSTEM(p) {
                   if ((p->p_flag & P_SYSTEM) != 0)
                           continue;
                   PROC_LOCK(p);
                   if (p->p_state != PRS_NEW) {
                           FOREACH_THREAD_IN_PROC(p, td) {
                                   thread_lock(td);
                                   switch (td->td_state) {
                                   case TDS_INHIBITED:
                                           if (TD_IS_SWAPPED(td))
                                                   total.t_sw++;
                                           else if (TD_IS_SLEEPING(td)) {
                                                   if (td->td_priority <= PZERO)
                                                           total.t_dw++;
                                                   else
                                                           total.t_sl++;
                                           }
                                           break;
                                   case TDS_CAN_RUN:
                                           total.t_sw++;
                                           break;
                                   case TDS_RUNQ:
                                   case TDS_RUNNING:
                                           total.t_rq++;
                                           break;
                                   default:
                                           break;
                                   }
                                   thread_unlock(td);
                           }
                   }
                   PROC_UNLOCK(p);
           }
           sx_sunlock(&allproc_lock);
           /*
            * Calculate object memory usage statistics.
            */
           mtx_lock(&vm_object_list_mtx);
           TAILQ_FOREACH(object, &vm_object_list, object_list) {
                   /*
                    * Perform unsynchronized reads on the object.  In
                    * this case, the lack of synchronization should not
                    * impair the accuracy of the reported statistics.
                    */
                   if ((object->flags & OBJ_FICTITIOUS) != 0) {
                           /*
                            * Devices, like /dev/mem, will badly skew our totals.
                            */
                           continue;
                   }
                   if (object->ref_count == 0) {
                           /*
                            * Also skip unreferenced objects, including
                            * vnodes representing mounted file systems.
                            */
                           continue;
                   }
                   if (object->ref_count == 1 &&
                       (object->flags & OBJ_NOSPLIT) != 0) {
                           /*
                            * Also skip otherwise unreferenced swap
                            * objects backing tmpfs vnodes, and POSIX or
                            * SysV shared memory.
                            */
                           continue;
                   }
                   total.t_vm += object->size;
                   total.t_rm += object->resident_page_count;
                   if (is_object_active(object)) {
                           total.t_avm += object->size;
                           total.t_arm += object->resident_page_count;
                   }
                   if (object->shadow_count > 1) {
                           /* shared object */
                           total.t_vmshr += object->size;
                           total.t_rmshr += object->resident_page_count;
                           if (is_object_active(object)) {
                                   total.t_avmshr += object->size;
                                   total.t_armshr += object->resident_page_count;
                           }
                   }
           }
           mtx_unlock(&vm_object_list_mtx);
           total.t_pw = vm_wait_count();
           total.t_free = vm_free_count();
   #if defined(COMPAT_FREEBSD11)
           /* sysctl(8) allocates twice as much memory as reported by sysctl(3) */
           if (curproc->p_osrel < P_OSREL_VMTOTAL64 && (req->oldlen ==
               sizeof(total11) || req->oldlen == 2 * sizeof(total11))) {
                   bzero(&total11, sizeof(total11));
                   total11.t_rq = total.t_rq;
                   total11.t_dw = total.t_dw;
                   total11.t_pw = total.t_pw;
                   total11.t_sl = total.t_sl;
                   total11.t_sw = total.t_sw;
                   total11.t_vm = total.t_vm;      /* truncate */
                   total11.t_avm = total.t_avm;    /* truncate */
                   total11.t_rm = total.t_rm;      /* truncate */
                   total11.t_arm = total.t_arm;    /* truncate */
                   total11.t_vmshr = total.t_vmshr;        /* truncate */
                   total11.t_avmshr = total.t_avmshr;      /* truncate */
                   total11.t_rmshr = total.t_rmshr;        /* truncate */
                   total11.t_armshr = total.t_armshr;      /* truncate */
                   total11.t_free = total.t_free;          /* truncate */
                   return (SYSCTL_OUT(req, &total11, sizeof(total11)));
           }
   #endif
           return (SYSCTL_OUT(req, &total, sizeof(total)));
   }
   
   SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE | CTLFLAG_RD |
       CTLFLAG_MPSAFE, NULL, 0, vmtotal, "S,vmtotal",
       "System virtual memory statistics");
   SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
   static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
           "VM meter sys stats");
   static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
           "VM meter vm stats");
   SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
   
   static int
   sysctl_handle_vmstat(SYSCTL_HANDLER_ARGS)
   {
           uint64_t val;
   #ifdef COMPAT_FREEBSD11
           uint32_t val32;
   #endif
   
           val = counter_u64_fetch(*(counter_u64_t *)arg1);
   #ifdef COMPAT_FREEBSD11
           if (req->oldlen == sizeof(val32)) {
                   val32 = val;            /* truncate */
                   return (SYSCTL_OUT(req, &val32, sizeof(val32)));
           }
   #endif
           return (SYSCTL_OUT(req, &val, sizeof(val)));
   }
   
   #define VM_STATS(parent, var, descr) \
       SYSCTL_OID(parent, OID_AUTO, var, CTLTYPE_U64 | CTLFLAG_MPSAFE | \
       CTLFLAG_RD, &vm_cnt.var, 0, sysctl_handle_vmstat, "QU", descr)
   #define VM_STATS_VM(var, descr)         VM_STATS(_vm_stats_vm, var, descr)
   #define VM_STATS_SYS(var, descr)        VM_STATS(_vm_stats_sys, var, descr)
   
   VM_STATS_SYS(v_swtch, "Context switches");
   VM_STATS_SYS(v_trap, "Traps");
   VM_STATS_SYS(v_syscall, "System calls");
   VM_STATS_SYS(v_intr, "Device interrupts");
   VM_STATS_SYS(v_soft, "Software interrupts");
   VM_STATS_VM(v_vm_faults, "Address memory faults");
   VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
   VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
   VM_STATS_VM(v_cow_optim, "Optimized COW faults");
   VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
   VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
   VM_STATS_VM(v_swapin, "Swap pager pageins");
   VM_STATS_VM(v_swapout, "Swap pager pageouts");
   VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
   VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
   VM_STATS_VM(v_vnodein, "Vnode pager pageins");
   VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
   VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
   VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
   VM_STATS_VM(v_intrans, "In transit page faults");
   VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon");
   VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
   VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls");
   VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
   VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
   VM_STATS_VM(v_tfree, "Total pages freed");
   VM_STATS_VM(v_forks, "Number of fork() calls");
   VM_STATS_VM(v_vforks, "Number of vfork() calls");
   VM_STATS_VM(v_rforks, "Number of rfork() calls");
   VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
   VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
   VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
   VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
   VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
   
   static int
   sysctl_handle_vmstat_proc(SYSCTL_HANDLER_ARGS)
   {
           u_int (*fn)(void);
           uint32_t val;
   
           fn = arg1;
           val = fn();
           return (SYSCTL_OUT(req, &val, sizeof(val)));
   }
   
   #define VM_STATS_PROC(var, descr, fn) \
       SYSCTL_OID(_vm_stats_vm, OID_AUTO, var, CTLTYPE_U32 | CTLFLAG_MPSAFE | \
       CTLFLAG_RD, fn, 0, sysctl_handle_vmstat_proc, "IU", descr)
   
   #define VM_STATS_UINT(var, descr)       \
       SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr)
   
   VM_STATS_UINT(v_page_size, "Page size in bytes");
   VM_STATS_UINT(v_page_count, "Total number of pages in system");
   VM_STATS_UINT(v_free_reserved, "Pages reserved for deadlock");
   VM_STATS_UINT(v_free_target, "Pages desired free");
   VM_STATS_UINT(v_free_min, "Minimum low-free-pages threshold");
   VM_STATS_PROC(v_free_count, "Free pages", vm_free_count);
   VM_STATS_PROC(v_wire_count, "Wired pages", vm_wire_count);
   VM_STATS_PROC(v_active_count, "Active pages", vm_active_count);
   VM_STATS_UINT(v_inactive_target, "Desired inactive pages");
   VM_STATS_PROC(v_inactive_count, "Inactive pages", vm_inactive_count);
   VM_STATS_PROC(v_laundry_count, "Pages eligible for laundering",
       vm_laundry_count);
   VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel");
   VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code");
   VM_STATS_UINT(v_free_severe, "Severe page depletion point");
   
   #ifdef COMPAT_FREEBSD11
   /*
    * Provide compatibility sysctls for the benefit of old utilities which exit
    * with an error if they cannot be found.
    */
   SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD,
       SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
   SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD,
       SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
   #endif
   
   u_int
   vm_free_count(void)
   {
           u_int v;
           int i;
   
           v = 0;
           for (i = 0; i < vm_ndomains; i++)
                   v += vm_dom[i].vmd_free_count;
   
           return (v);
   }
   
   static u_int
   vm_pagequeue_count(int pq)
   {
           u_int v;
           int i;
   
           v = 0;
           for (i = 0; i < vm_ndomains; i++)
                   v += vm_dom[i].vmd_pagequeues[pq].pq_cnt;
   
           return (v);
   }
   
   u_int
   vm_active_count(void)
   {
   
           return (vm_pagequeue_count(PQ_ACTIVE));
   }
   
   u_int
   vm_inactive_count(void)
   {
   
           return (vm_pagequeue_count(PQ_INACTIVE));
   }
   
   u_int
   vm_laundry_count(void)
   {
   
           return (vm_pagequeue_count(PQ_LAUNDRY));
   }
   
   static int
   sysctl_vm_pdpages(SYSCTL_HANDLER_ARGS)
   {
           struct vm_pagequeue *pq;
           uint64_t ret;
           int dom, i;
   
           ret = counter_u64_fetch(vm_cnt.v_pdpages);
           for (dom = 0; dom < vm_ndomains; dom++)
                   for (i = 0; i < PQ_COUNT; i++) {
                           pq = &VM_DOMAIN(dom)->vmd_pagequeues[i];
                           ret += pq->pq_pdpages;
                   }
           return (SYSCTL_OUT(req, &ret, sizeof(ret)));
   }
   SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages,
       CTLTYPE_U64 | CTLFLAG_MPSAFE | CTLFLAG_RD, NULL, 0, sysctl_vm_pdpages, "QU",
       "Pages analyzed by pagedaemon");
   
   static void
   vm_domain_stats_init(struct vm_domain *vmd, struct sysctl_oid *parent)
   {
           struct sysctl_oid *oid;
   
           vmd->vmd_oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(parent), OID_AUTO,
               vmd->vmd_name, CTLFLAG_RD, NULL, "");
           oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(vmd->vmd_oid), OID_AUTO,
               "stats", CTLFLAG_RD, NULL, "");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "free_count", CTLFLAG_RD, &vmd->vmd_free_count, 0,
               "Free pages");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "active", CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_ACTIVE].pq_cnt, 0,
               "Active pages");
           SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "actpdpgs", CTLFLAG_RD,
               &vmd->vmd_pagequeues[PQ_ACTIVE].pq_pdpages, 0,
               "Active pages scanned by the page daemon");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "inactive", CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_INACTIVE].pq_cnt, 0,
               "Inactive pages");
           SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "inactpdpgs", CTLFLAG_RD,
               &vmd->vmd_pagequeues[PQ_INACTIVE].pq_pdpages, 0,
               "Inactive pages scanned by the page daemon");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "laundry", CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_LAUNDRY].pq_cnt, 0,
               "laundry pages");
           SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "laundpdpgs", CTLFLAG_RD,
               &vmd->vmd_pagequeues[PQ_LAUNDRY].pq_pdpages, 0,
               "Laundry pages scanned by the page daemon");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO, "unswappable",
               CTLFLAG_RD, &vmd->vmd_pagequeues[PQ_UNSWAPPABLE].pq_cnt, 0,
               "Unswappable pages");
           SYSCTL_ADD_U64(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "unswppdpgs", CTLFLAG_RD,
               &vmd->vmd_pagequeues[PQ_UNSWAPPABLE].pq_pdpages, 0,
               "Unswappable pages scanned by the page daemon");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "inactive_target", CTLFLAG_RD, &vmd->vmd_inactive_target, 0,
               "Target inactive pages");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "free_target", CTLFLAG_RD, &vmd->vmd_free_target, 0,
               "Target free pages");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "free_reserved", CTLFLAG_RD, &vmd->vmd_free_reserved, 0,
               "Reserved free pages");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "free_min", CTLFLAG_RD, &vmd->vmd_free_min, 0,
               "Minimum free pages");
           SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
               "free_severe", CTLFLAG_RD, &vmd->vmd_free_severe, 0,
               "Severe free pages");
   
   }
   
   static void
   vm_stats_init(void *arg __unused)
   {
           struct sysctl_oid *oid;
           int i;
   
           oid = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_vm), OID_AUTO,
               "domain", CTLFLAG_RD, NULL, "");
           for (i = 0; i < vm_ndomains; i++)
                   vm_domain_stats_init(VM_DOMAIN(i), oid);
   }
   
   SYSINIT(vmstats_init, SI_SUB_VM_CONF, SI_ORDER_FIRST, vm_stats_init, NULL);

Cache object: cee889af9e41ead5a0be1d853349965b