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90ecac61c0
freebsd-dev/sys/vm/vm_meter.c
Matthew Dillon 90ecac61c0 Reviewed by: Alan Cox <alc@cs.rice.edu>, David Greenman <dg@root.com> 
Replace various VM related page count calculations strewn over the
    VM code with inlines to aid in readability and to reduce fragility
    in the code where modules depend on the same test being performed
    to properly sleep and wakeup.

    Split out a portion of the page deactivation code into an inline
    in vm_page.c to support vm_page_dontneed().

    add vm_page_dontneed(), which handles the madvise MADV_DONTNEED
    feature in a related commit coming up for vm_map.c/vm_object.c.  This
    code prevents degenerate cases where an essentially active page may
    be rotated through a subset of the paging lists, resulting in premature
    disposal.
1999-09-17 04:56:40 +00:00

329 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_prot.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;
/* fall through */
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_INT(_vm, VM_V_FREE_MIN, v_free_min,
CTLFLAG_RW, &cnt.v_free_min, 0, "");
SYSCTL_INT(_vm, VM_V_FREE_TARGET, v_free_target,
CTLFLAG_RW, &cnt.v_free_target, 0, "");
SYSCTL_INT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
CTLFLAG_RW, &cnt.v_free_reserved, 0, "");
SYSCTL_INT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
CTLFLAG_RW, &cnt.v_inactive_target, 0, "");
SYSCTL_INT(_vm, VM_V_CACHE_MIN, v_cache_min,
CTLFLAG_RW, &cnt.v_cache_min, 0, "");
SYSCTL_INT(_vm, VM_V_CACHE_MAX, v_cache_max,
CTLFLAG_RW, &cnt.v_cache_max, 0, "");
SYSCTL_INT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "");
SYSCTL_INT(_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 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 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_INT(_vm_stats_sys, OID_AUTO,
v_swtch, CTLFLAG_RD, &cnt.v_swtch, 0, "Context switches");
SYSCTL_INT(_vm_stats_sys, OID_AUTO,
v_trap, CTLFLAG_RD, &cnt.v_trap, 0, "Traps");
SYSCTL_INT(_vm_stats_sys, OID_AUTO,
v_syscall, CTLFLAG_RD, &cnt.v_syscall, 0, "Syscalls");
SYSCTL_INT(_vm_stats_sys, OID_AUTO, v_intr, CTLFLAG_RD,
&cnt.v_intr, 0, "Hardware interrupts");
SYSCTL_INT(_vm_stats_sys, OID_AUTO, v_soft, CTLFLAG_RD,
&cnt.v_soft, 0, "Software interrupts");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_vm_faults, CTLFLAG_RD, &cnt.v_vm_faults, 0, "VM faults");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_cow_faults, CTLFLAG_RD, &cnt.v_cow_faults, 0, "COW faults");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_cow_optim, CTLFLAG_RD, &cnt.v_cow_optim, 0, "Optimized COW faults");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_zfod, CTLFLAG_RD, &cnt.v_zfod, 0, "Zero fill");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_ozfod, CTLFLAG_RD, &cnt.v_ozfod, 0, "Optimized zero fill");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_swapin, CTLFLAG_RD, &cnt.v_swapin, 0, "Swapin operations");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_swapout, CTLFLAG_RD, &cnt.v_swapout, 0, "Swapout operations");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_swappgsin, CTLFLAG_RD, &cnt.v_swappgsin, 0, "Swapin pages");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_swappgsout, CTLFLAG_RD, &cnt.v_swappgsout, 0, "Swapout pages");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_vnodein, CTLFLAG_RD, &cnt.v_vnodein, 0, "Vnodein operations");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_vnodeout, CTLFLAG_RD, &cnt.v_vnodeout, 0, "Vnodeout operations");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_vnodepgsin, CTLFLAG_RD, &cnt.v_vnodepgsin, 0, "Vnodein pages");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_vnodepgsout, CTLFLAG_RD, &cnt.v_vnodepgsout, 0, "Vnodeout pages");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_intrans, CTLFLAG_RD, &cnt.v_intrans, 0, "In transit page blocking");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_reactivated, CTLFLAG_RD, &cnt.v_reactivated, 0, "Reactivated pages");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_pdwakeups, CTLFLAG_RD, &cnt.v_pdwakeups, 0, "Pagedaemon wakeups");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_pdpages, CTLFLAG_RD, &cnt.v_pdpages, 0, "Pagedaemon page scans");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_dfree, CTLFLAG_RD, &cnt.v_dfree, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_pfree, CTLFLAG_RD, &cnt.v_pfree, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_tfree, CTLFLAG_RD, &cnt.v_tfree, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_page_size, CTLFLAG_RD, &cnt.v_page_size, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_page_count, CTLFLAG_RD, &cnt.v_page_count, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_free_reserved, CTLFLAG_RD, &cnt.v_free_reserved, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_free_target, CTLFLAG_RD, &cnt.v_free_target, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_free_min, CTLFLAG_RD, &cnt.v_free_min, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_free_count, CTLFLAG_RD, &cnt.v_free_count, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_wire_count, CTLFLAG_RD, &cnt.v_wire_count, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_active_count, CTLFLAG_RD, &cnt.v_active_count, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_inactive_target, CTLFLAG_RD, &cnt.v_inactive_target, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_inactive_count, CTLFLAG_RD, &cnt.v_inactive_count, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_cache_count, CTLFLAG_RD, &cnt.v_cache_count, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_cache_min, CTLFLAG_RD, &cnt.v_cache_min, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_cache_max, CTLFLAG_RD, &cnt.v_cache_max, 0, "");
SYSCTL_INT(_vm_stats_vm, OID_AUTO,
v_pageout_free_min, CTLFLAG_RD, &cnt.v_pageout_free_min, 0, "");
SYSCTL_INT(_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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