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File: [cvs.NetBSD.org] / src / sys / uvm / uvm_meter.c (download)

Revision 1.12, Fri May 26 00:36:53 2000 UTC (20 years, 5 months ago) by thorpej
Branch: MAIN
CVS Tags: netbsd-1-5-base, netbsd-1-5-RELEASE, netbsd-1-5-PATCH003, netbsd-1-5-PATCH002, netbsd-1-5-PATCH001, netbsd-1-5-BETA2, netbsd-1-5-BETA, netbsd-1-5-ALPHA2, netbsd-1-5, minoura-xpg4dl-base, minoura-xpg4dl
Changes since 1.11: +3 -1 lines

Introduce a new process state distinct from SRUN called SONPROC
which indicates that the process is actually running on a
processor.  Test against SONPROC as appropriate rather than
combinations of SRUN and curproc.  Update all context switch code
to properly set SONPROC when the process becomes the current
process on the CPU.

/*	$NetBSD: uvm_meter.c,v 1.12 2000/05/26 00:36:53 thorpej Exp $	*/

/*
 * Copyright (c) 1997 Charles D. Cranor and Washington University.
 * 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 Charles D. Cranor,
 *      Washington University, and 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
 * from: Id: uvm_meter.c,v 1.1.2.1 1997/08/14 19:10:35 chuck Exp
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <vm/vm.h>
#include <sys/sysctl.h>

/*
 * maxslp: ???? XXXCDC
 */

int maxslp = MAXSLP;	/* patchable ... */
struct loadavg averunnable; /* decl. */

/*
 * 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) */
};

/*
 * prototypes
 */

static void uvm_loadav __P((struct loadavg *));
static void uvm_total __P((struct vmtotal *));

/*
 * uvm_meter: calculate load average and wake up the swapper (if needed)
 */
void
uvm_meter()
{
	if ((time.tv_sec % 5) == 0)
		uvm_loadav(&averunnable);
	if (proc0.p_slptime > (maxslp / 2))
		wakeup((caddr_t)&proc0);
}

/*
 * uvm_loadav: compute a tenex style load average of a quantity on 
 * 1, 5, and 15 minute internvals.
 */
static void
uvm_loadav(avg)
	struct loadavg *avg;
{
	int i, nrun;
	struct proc *p;

	proclist_lock_read();
	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 > 1)
				continue;
		/* fall through */
		case SRUN:
		case SONPROC:
		case SIDL:
			nrun++;
		}
	}
	proclist_unlock_read();
	for (i = 0; i < 3; i++)
		avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
		    nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
}

/*
 * uvm_sysctl: sysctl hook into UVM system.
 */
int
uvm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
	int *name;
	u_int namelen;
	void *oldp;
	size_t *oldlenp;
	void *newp;
	size_t newlen;
	struct proc *p;
{
	struct vmtotal vmtotals;

	/* all sysctl names at this level are terminal */
	if (namelen != 1)
		return (ENOTDIR);		/* overloaded */

	switch (name[0]) {
	case VM_LOADAVG:
		return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable,
		    sizeof(averunnable)));

	case VM_METER:
		uvm_total(&vmtotals);
		return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals,
		    sizeof(vmtotals)));

	case VM_UVMEXP:
		return (sysctl_rdstruct(oldp, oldlenp, newp, &uvmexp,
		    sizeof(uvmexp)));

	case VM_NKMEMPAGES:
		return (sysctl_rdint(oldp, oldlenp, newp, nkmempages));

	default:
		return (EOPNOTSUPP);
	}
	/* NOTREACHED */
}

/*
 * uvm_total: calculate the current state of the system.
 */
static void
uvm_total(totalp)
	struct vmtotal *totalp;
{
	struct proc *p;
#if 0
	vm_map_entry_t	entry;
	vm_map_t map;
	int paging;
#endif

	memset(totalp, 0, sizeof *totalp);

	/*
	 * calculate process statistics
	 */

	proclist_lock_read();
	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 SONPROC:
		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
		 */
#if 0
		/*
		 * XXXCDC: BOGUS!  rethink this.   in the mean time
		 * don't do it.
		 */
		paging = 0;
		vm_map_lock(map);
		for (map = &p->p_vmspace->vm_map, entry = map->header.next;
		    entry != &map->header; entry = entry->next) {
			if (entry->is_a_map || entry->is_sub_map ||
			    entry->object.uvm_obj == NULL)
				continue;
			/* XXX how to do this with uvm */
		}
		vm_map_unlock(map);
		if (paging)
			totalp->t_pw++;
#endif
	}
	proclist_unlock_read();
	/*
	 * Calculate object memory usage statistics.
	 */
	totalp->t_free = uvmexp.free;
	totalp->t_vm = uvmexp.npages - uvmexp.free + uvmexp.swpginuse;
	totalp->t_avm = uvmexp.active + uvmexp.swpginuse;	/* XXX */
	totalp->t_rm = uvmexp.npages - uvmexp.free;
	totalp->t_arm = uvmexp.active;
	totalp->t_vmshr = 0;		/* XXX */
	totalp->t_avmshr = 0;		/* XXX */
	totalp->t_rmshr = 0;		/* XXX */
	totalp->t_armshr = 0;		/* XXX */
}