123459Smckusick /*
263379Sbostic * Copyright (c) 1982, 1986, 1989, 1993
363379Sbostic * The Regents of the University of California. All rights reserved.
423459Smckusick *
544461Sbostic * %sccs.include.redist.c%
637729Smckusick *
7*69380Smckusick * @(#)vm_meter.c 8.7 (Berkeley) 05/10/95
823459Smckusick */
943Sbill
1053352Sbostic #include <sys/param.h>
1153352Sbostic #include <sys/proc.h>
1253352Sbostic #include <sys/systm.h>
1353352Sbostic #include <sys/kernel.h>
1459358Smckusick #include <vm/vm.h>
1557844Smckusick #include <sys/sysctl.h>
1648386Skarels
1752664Smckusick struct loadavg averunnable; /* load average, of runnable procs */
1845746Smckusick
1943Sbill int maxslp = MAXSLP;
2043Sbill int saferss = SAFERSS;
213593Swnj
2253352Sbostic void
vmmeter()2343Sbill vmmeter()
2443Sbill {
2543Sbill
2645746Smckusick if (time.tv_sec % 5 == 0)
2752664Smckusick loadav(&averunnable);
2848386Skarels if (proc0.p_slptime > maxslp/2)
2948386Skarels wakeup((caddr_t)&proc0);
3043Sbill }
3143Sbill
3243Sbill /*
3343Sbill * Constants for averages over 1, 5, and 15 minutes
3443Sbill * when sampling at 5 second intervals.
3543Sbill */
3638166Smckusick fixpt_t cexp[3] = {
3738166Smckusick 0.9200444146293232 * FSCALE, /* exp(-1/12) */
3838166Smckusick 0.9834714538216174 * FSCALE, /* exp(-1/60) */
3938166Smckusick 0.9944598480048967 * FSCALE, /* exp(-1/180) */
4043Sbill };
4143Sbill
4243Sbill /*
4343Sbill * Compute a tenex style load average of a quantity on
4443Sbill * 1, 5 and 15 minute intervals.
4543Sbill */
4653352Sbostic void
loadav(avg)4750958Smckusick loadav(avg)
4852664Smckusick register struct loadavg *avg;
4943Sbill {
5050958Smckusick register int i, nrun;
5150958Smckusick register struct proc *p;
5243Sbill
5367719Smckusick for (nrun = 0, p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
5450958Smckusick switch (p->p_stat) {
5550958Smckusick case SSLEEP:
5664625Sbostic if (p->p_priority > PZERO || p->p_slptime != 0)
5750958Smckusick continue;
5850958Smckusick /* fall through */
5950958Smckusick case SRUN:
6050958Smckusick case SIDL:
6150958Smckusick nrun++;
6250958Smckusick }
6350958Smckusick }
6443Sbill for (i = 0; i < 3; i++)
6552664Smckusick avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
6652664Smckusick nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
6743Sbill }
6850958Smckusick
6950958Smckusick /*
7057844Smckusick * Attributes associated with virtual memory.
7152664Smckusick */
vm_sysctl(name,namelen,oldp,oldlenp,newp,newlen,p)7258398Smckusick vm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
7357844Smckusick int *name;
7457844Smckusick u_int namelen;
7557844Smckusick void *oldp;
7658468Sbostic size_t *oldlenp;
7757844Smckusick void *newp;
7858468Sbostic size_t newlen;
7958398Smckusick struct proc *p;
8052664Smckusick {
8157844Smckusick struct vmtotal vmtotals;
8252664Smckusick
8357844Smckusick /* all sysctl names at this level are terminal */
8457844Smckusick if (namelen != 1)
8557844Smckusick return (ENOTDIR); /* overloaded */
8657844Smckusick
8757844Smckusick switch (name[0]) {
8857844Smckusick case VM_LOADAVG:
8957844Smckusick averunnable.fscale = FSCALE;
9057844Smckusick return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable,
9157844Smckusick sizeof(averunnable)));
9257844Smckusick case VM_METER:
9357844Smckusick vmtotal(&vmtotals);
9457844Smckusick return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals,
9557844Smckusick sizeof(vmtotals)));
9657844Smckusick default:
9757844Smckusick return (EOPNOTSUPP);
9852664Smckusick }
9957844Smckusick /* NOTREACHED */
10052664Smckusick }
10152664Smckusick
10252664Smckusick /*
10350958Smckusick * Calculate the current state of the system.
10450958Smckusick * Done on demand from getkerninfo().
10550958Smckusick */
10653352Sbostic void
vmtotal(totalp)10750958Smckusick vmtotal(totalp)
10850958Smckusick register struct vmtotal *totalp;
10950958Smckusick {
11050958Smckusick register struct proc *p;
11150958Smckusick register vm_map_entry_t entry;
11250958Smckusick register vm_object_t object;
11350958Smckusick register vm_map_t map;
11450958Smckusick int paging;
11550958Smckusick
11650958Smckusick bzero(totalp, sizeof *totalp);
11750958Smckusick /*
11850958Smckusick * Mark all objects as inactive.
11950958Smckusick */
12050958Smckusick simple_lock(&vm_object_list_lock);
12165231Smckusick for (object = vm_object_list.tqh_first;
12265231Smckusick object != NULL;
12365231Smckusick object = object->object_list.tqe_next)
12450958Smckusick object->flags &= ~OBJ_ACTIVE;
12550958Smckusick simple_unlock(&vm_object_list_lock);
12650958Smckusick /*
12750958Smckusick * Calculate process statistics.
12850958Smckusick */
12967719Smckusick for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
13064625Sbostic if (p->p_flag & P_SYSTEM)
13150958Smckusick continue;
13250958Smckusick switch (p->p_stat) {
13350958Smckusick case 0:
13450958Smckusick continue;
13550958Smckusick
13650958Smckusick case SSLEEP:
13750958Smckusick case SSTOP:
13864625Sbostic if (p->p_flag & P_INMEM) {
13964625Sbostic if (p->p_priority <= PZERO)
14050958Smckusick totalp->t_dw++;
14150958Smckusick else if (p->p_slptime < maxslp)
14250958Smckusick totalp->t_sl++;
14350958Smckusick } else if (p->p_slptime < maxslp)
14450958Smckusick totalp->t_sw++;
14550958Smckusick if (p->p_slptime >= maxslp)
14650958Smckusick continue;
14750958Smckusick break;
14850958Smckusick
14950958Smckusick case SRUN:
15050958Smckusick case SIDL:
15164625Sbostic if (p->p_flag & P_INMEM)
15250958Smckusick totalp->t_rq++;
15350958Smckusick else
15450958Smckusick totalp->t_sw++;
15550958Smckusick if (p->p_stat == SIDL)
15650958Smckusick continue;
15750958Smckusick break;
15850958Smckusick }
15950958Smckusick /*
16050958Smckusick * Note active objects.
16167579Shibler *
16267579Shibler * XXX don't count shadow objects with no resident pages.
16367579Shibler * This eliminates the forced shadows caused by MAP_PRIVATE.
16467579Shibler * Right now we require that such an object completely shadow
16567579Shibler * the original, to catch just those cases.
16650958Smckusick */
16750958Smckusick paging = 0;
16850958Smckusick for (map = &p->p_vmspace->vm_map, entry = map->header.next;
16950958Smckusick entry != &map->header; entry = entry->next) {
17052825Shibler if (entry->is_a_map || entry->is_sub_map ||
17167579Shibler (object = entry->object.vm_object) == NULL)
17250958Smckusick continue;
17367579Shibler while (object->shadow &&
17467579Shibler object->resident_page_count == 0 &&
17567579Shibler object->shadow_offset == 0 &&
17667579Shibler object->size == object->shadow->size)
17767579Shibler object = object->shadow;
17867579Shibler object->flags |= OBJ_ACTIVE;
17967579Shibler paging |= object->paging_in_progress;
18050958Smckusick }
18150958Smckusick if (paging)
18250958Smckusick totalp->t_pw++;
18350958Smckusick }
18450958Smckusick /*
18550958Smckusick * Calculate object memory usage statistics.
18650958Smckusick */
18750958Smckusick simple_lock(&vm_object_list_lock);
18865231Smckusick for (object = vm_object_list.tqh_first;
18965231Smckusick object != NULL;
19065231Smckusick object = object->object_list.tqe_next) {
19150958Smckusick totalp->t_vm += num_pages(object->size);
19250958Smckusick totalp->t_rm += object->resident_page_count;
19350958Smckusick if (object->flags & OBJ_ACTIVE) {
19450958Smckusick totalp->t_avm += num_pages(object->size);
19550958Smckusick totalp->t_arm += object->resident_page_count;
19650958Smckusick }
19750958Smckusick if (object->ref_count > 1) {
19850958Smckusick /* shared object */
19950958Smckusick totalp->t_vmshr += num_pages(object->size);
20050958Smckusick totalp->t_rmshr += object->resident_page_count;
20150958Smckusick if (object->flags & OBJ_ACTIVE) {
20250958Smckusick totalp->t_avmshr += num_pages(object->size);
20350958Smckusick totalp->t_armshr += object->resident_page_count;
20450958Smckusick }
20550958Smckusick }
20650958Smckusick }
207*69380Smckusick simple_unlock(&vm_object_list_lock);
20850958Smckusick totalp->t_free = cnt.v_free_count;
20950958Smckusick }
210