xref: /csrg-svn/sys/vm/vm_meter.c (revision 69380)
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