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freebsd-skq/sys/vm/vm_meter.c
jasone 769e0f974d Major update to the way synchronization is done in the kernel. Highlights 
include:

* Mutual exclusion is used instead of spl*().  See mutex(9).  (Note: The
  alpha port is still in transition and currently uses both.)

* Per-CPU idle processes.

* Interrupts are run in their own separate kernel threads and can be
  preempted (i386 only).

Partially contributed by:	BSDi (BSD/OS)
Submissions by (at least):	cp, dfr, dillon, grog, jake, jhb, sheldonh
2000-09-07 01:33:02 +00:00

333 lines
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/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/resource.h>
#include <sys/vmmeter.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_extern.h>
#include <vm/vm_param.h>
#include <sys/lock.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <sys/sysctl.h>
struct loadavg averunnable =
{ {0, 0, 0}, FSCALE }; /* load average, of runnable procs */
struct vmmeter cnt;
static int maxslp = MAXSLP;
/*
* Constants for averages over 1, 5, and 15 minutes
* when sampling at 5 second intervals.
*/
static fixpt_t cexp[3] = {
0.9200444146293232 * FSCALE, /* exp(-1/12) */
0.9834714538216174 * FSCALE, /* exp(-1/60) */
0.9944598480048967 * FSCALE, /* exp(-1/180) */
};
/*
* Compute a tenex style load average of a quantity on
* 1, 5 and 15 minute intervals.
*/
static void
loadav(struct loadavg *avg)
{
register int i, nrun;
register struct proc *p;
for (nrun = 0, p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
switch (p->p_stat) {
case SSLEEP:
if (p->p_priority > PZERO || p->p_slptime != 0)
continue;
/* FALLTHROUGH */
case SRUN:
case SIDL:
nrun++;
}
}
for (i = 0; i < 3; i++)
avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
}
void
vmmeter()
{
if (time_second % 5 == 0)
loadav(&averunnable);
if (proc0.p_slptime > maxslp / 2)
wakeup(&proc0);
}
SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
CTLFLAG_RW, &cnt.v_free_min, 0, "");
SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
CTLFLAG_RW, &cnt.v_free_target, 0, "");
SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
CTLFLAG_RW, &cnt.v_free_reserved, 0, "");
SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
CTLFLAG_RW, &cnt.v_inactive_target, 0, "");
SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
CTLFLAG_RW, &cnt.v_cache_min, 0, "");
SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
CTLFLAG_RW, &cnt.v_cache_max, 0, "");
SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
CTLFLAG_RW, &cnt.v_free_severe, 0, "");
SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD,
&averunnable, loadavg, "Machine loadaverage history");
static int
vmtotal(SYSCTL_HANDLER_ARGS)
{
struct proc *p;
struct vmtotal total, *totalp;
vm_map_entry_t entry;
vm_object_t object;
vm_map_t map;
int paging;
totalp = &total;
bzero(totalp, sizeof *totalp);
/*
* Mark all objects as inactive.
*/
for (object = TAILQ_FIRST(&vm_object_list);
object != NULL;
object = TAILQ_NEXT(object,object_list))
vm_object_clear_flag(object, OBJ_ACTIVE);
/*
* Calculate process statistics.
*/
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
if (p->p_flag & P_SYSTEM)
continue;
switch (p->p_stat) {
case 0:
continue;
case SMTX:
case SSLEEP:
case SSTOP:
if (p->p_flag & P_INMEM) {
if (p->p_priority <= PZERO)
totalp->t_dw++;
else if (p->p_slptime < maxslp)
totalp->t_sl++;
} else if (p->p_slptime < maxslp)
totalp->t_sw++;
if (p->p_slptime >= maxslp)
continue;
break;
case SWAIT:
totalp->t_sl++;
continue;
case SRUN:
case SIDL:
if (p->p_flag & P_INMEM)
totalp->t_rq++;
else
totalp->t_sw++;
if (p->p_stat == SIDL)
continue;
break;
}
/*
* Note active objects.
*/
paging = 0;
for (map = &p->p_vmspace->vm_map, entry = map->header.next;
entry != &map->header; entry = entry->next) {
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
entry->object.vm_object == NULL)
continue;
vm_object_set_flag(entry->object.vm_object, OBJ_ACTIVE);
paging |= entry->object.vm_object->paging_in_progress;
}
if (paging)
totalp->t_pw++;
}
/*
* Calculate object memory usage statistics.
*/
for (object = TAILQ_FIRST(&vm_object_list);
object != NULL;
object = TAILQ_NEXT(object, object_list)) {
/*
* devices, like /dev/mem, will badly skew our totals
*/
if (object->type == OBJT_DEVICE)
continue;
totalp->t_vm += object->size;
totalp->t_rm += object->resident_page_count;
if (object->flags & OBJ_ACTIVE) {
totalp->t_avm += object->size;
totalp->t_arm += object->resident_page_count;
}
if (object->shadow_count > 1) {
/* shared object */
totalp->t_vmshr += object->size;
totalp->t_rmshr += object->resident_page_count;
if (object->flags & OBJ_ACTIVE) {
totalp->t_avmshr += object->size;
totalp->t_armshr += object->resident_page_count;
}
}
}
totalp->t_free = cnt.v_free_count + cnt.v_cache_count;
return (sysctl_handle_opaque(oidp, totalp, sizeof total, req));
}
SYSCTL_PROC(_vm, VM_METER, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD,
0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
"System virtual memory statistics");
SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
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");
SYSCTL_UINT(_vm_stats_sys, OID_AUTO,
v_swtch, CTLFLAG_RD, &cnt.v_swtch, 0, "Context switches");
SYSCTL_UINT(_vm_stats_sys, OID_AUTO,
v_trap, CTLFLAG_RD, &cnt.v_trap, 0, "Traps");
SYSCTL_UINT(_vm_stats_sys, OID_AUTO,
v_syscall, CTLFLAG_RD, &cnt.v_syscall, 0, "Syscalls");
SYSCTL_UINT(_vm_stats_sys, OID_AUTO, v_intr, CTLFLAG_RD,
&cnt.v_intr, 0, "Hardware interrupts");
SYSCTL_UINT(_vm_stats_sys, OID_AUTO, v_soft, CTLFLAG_RD,
&cnt.v_soft, 0, "Software interrupts");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_vm_faults, CTLFLAG_RD, &cnt.v_vm_faults, 0, "VM faults");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_cow_faults, CTLFLAG_RD, &cnt.v_cow_faults, 0, "COW faults");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_cow_optim, CTLFLAG_RD, &cnt.v_cow_optim, 0, "Optimized COW faults");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_zfod, CTLFLAG_RD, &cnt.v_zfod, 0, "Zero fill");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_ozfod, CTLFLAG_RD, &cnt.v_ozfod, 0, "Optimized zero fill");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_swapin, CTLFLAG_RD, &cnt.v_swapin, 0, "Swapin operations");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_swapout, CTLFLAG_RD, &cnt.v_swapout, 0, "Swapout operations");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_swappgsin, CTLFLAG_RD, &cnt.v_swappgsin, 0, "Swapin pages");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_swappgsout, CTLFLAG_RD, &cnt.v_swappgsout, 0, "Swapout pages");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_vnodein, CTLFLAG_RD, &cnt.v_vnodein, 0, "Vnodein operations");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_vnodeout, CTLFLAG_RD, &cnt.v_vnodeout, 0, "Vnodeout operations");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_vnodepgsin, CTLFLAG_RD, &cnt.v_vnodepgsin, 0, "Vnodein pages");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_vnodepgsout, CTLFLAG_RD, &cnt.v_vnodepgsout, 0, "Vnodeout pages");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_intrans, CTLFLAG_RD, &cnt.v_intrans, 0, "In transit page blocking");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_reactivated, CTLFLAG_RD, &cnt.v_reactivated, 0, "Reactivated pages");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_pdwakeups, CTLFLAG_RD, &cnt.v_pdwakeups, 0, "Pagedaemon wakeups");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_pdpages, CTLFLAG_RD, &cnt.v_pdpages, 0, "Pagedaemon page scans");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_dfree, CTLFLAG_RD, &cnt.v_dfree, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_pfree, CTLFLAG_RD, &cnt.v_pfree, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_tfree, CTLFLAG_RD, &cnt.v_tfree, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_page_size, CTLFLAG_RD, &cnt.v_page_size, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_page_count, CTLFLAG_RD, &cnt.v_page_count, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_free_reserved, CTLFLAG_RD, &cnt.v_free_reserved, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_free_target, CTLFLAG_RD, &cnt.v_free_target, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_free_min, CTLFLAG_RD, &cnt.v_free_min, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_free_count, CTLFLAG_RD, &cnt.v_free_count, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_wire_count, CTLFLAG_RD, &cnt.v_wire_count, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_active_count, CTLFLAG_RD, &cnt.v_active_count, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_inactive_target, CTLFLAG_RD, &cnt.v_inactive_target, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_inactive_count, CTLFLAG_RD, &cnt.v_inactive_count, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_cache_count, CTLFLAG_RD, &cnt.v_cache_count, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_cache_min, CTLFLAG_RD, &cnt.v_cache_min, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_cache_max, CTLFLAG_RD, &cnt.v_cache_max, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_pageout_free_min, CTLFLAG_RD, &cnt.v_pageout_free_min, 0, "");
SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
v_interrupt_free_min, CTLFLAG_RD, &cnt.v_interrupt_free_min, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");
#if 0
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
page_mask, CTLFLAG_RD, &page_mask, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
page_shift, CTLFLAG_RD, &page_shift, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
first_page, CTLFLAG_RD, &first_page, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
last_page, CTLFLAG_RD, &last_page, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
vm_page_bucket_count, CTLFLAG_RD, &vm_page_bucket_count, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
vm_page_hash_mask, CTLFLAG_RD, &vm_page_hash_mask, 0, "");
#endif
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