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freebsd-skq/sys/vm/vm_meter.c
Conrad Meyer 0292c54bdb Add support for multithreading the inactive queue pageout within a domain. 
In very high throughput workloads, the inactive scan can become overwhelmed
as you have many cores producing pages and a single core freeing.  Since
Mark's introduction of batched pagequeue operations, we can now run multiple
inactive threads working on independent batches.

To avoid confusing the pid and other control algorithms, I (Jeff) do this in
a mpi-like fan out and collect model that is driven from the primary page
daemon.  It decides whether the shortfall can be overcome with a single
thread and if not dispatches multiple threads and waits for their results.

The heuristic is based on timing the pageout activity and averaging a
pages-per-second variable which is exponentially decayed. This is visible in
sysctl and may be interesting for other purposes.

I (Jeff) have verified that this does indeed double our paging throughput
when used with two threads. With four we tend to run into other contention
problems.  For now I would like to commit this infrastructure with only a
single thread enabled.

The number of worker threads per domain can be controlled with the
'vm.pageout_threads_per_domain' tunable.

Submitted by:	jeff (earlier version)
Discussed with:	markj
Tested by:	pho
Sponsored by:	probably Netflix (based on contemporary commits)
Differential Revision:	https://reviews.freebsd.org/D21629
2020-08-11 20:37:45 +00:00

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/*-
* 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("$FreeBSD$");
#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,
};
u_long __exclusive_cache_line vm_user_wire_count;
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_ANON) == 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 | CTLFLAG_MPSAFE, 0,
"VM meter stats");
static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"VM meter sys stats");
static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"VM meter vm stats");
SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW | CTLFLAG_MPSAFE, 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)
#define VM_STATS_ULONG(var, descr) \
SYSCTL_ULONG(_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");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO, v_user_wire_count, CTLFLAG_RD,
&vm_user_wire_count, 0, "User-wired virtual memory");
#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 | CTLFLAG_MPSAFE, NULL, "");
oid = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(vmd->vmd_oid), OID_AUTO,
"stats", CTLFLAG_RD | CTLFLAG_MPSAFE, 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");
SYSCTL_ADD_UINT(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"inactive_pps", CTLFLAG_RD, &vmd->vmd_inactive_pps, 0,
"inactive pages freed/second");
}
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 | CTLFLAG_MPSAFE, 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);
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