NetBSD/sys/vm/vm_meter.c

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/*
* Copyright (c) 1982, 1986, 1989 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.
*
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* from: @(#)vm_meter.c 7.11 (Berkeley) 4/20/91
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* $Id: vm_meter.c,v 1.9 1994/01/28 04:50:47 cgd Exp $
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*/
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#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
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#include <sys/vmmeter.h>
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#include <vm/vm_param.h>
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struct loadavg averunnable;
#if defined(COMPAT_43) && (defined(vax) || defined(tahoe))
double avenrun[3];
#endif /* COMPAT_43 */
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int maxslp = MAXSLP;
#ifndef MACHINE_NONCONTIG
int saferss = SAFERSS;
#endif /* MACHINE_NONCONTIG */
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static void vmtotal __P((void));
static void loadav __P((fixpt_t *, int));
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void
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vmmeter()
{
register unsigned *cp, *rp, *sp;
if (time.tv_sec % 5 == 0)
vmtotal();
if (proc0.p_slptime > maxslp/2)
wakeup((caddr_t)&proc0);
}
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static void
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vmtotal()
{
register struct proc *p;
int nrun = 0;
total.t_vm = 0;
total.t_avm = 0;
total.t_rm = 0;
total.t_arm = 0;
total.t_rq = 0;
total.t_dw = 0;
total.t_pw = 0;
total.t_sl = 0;
total.t_sw = 0;
for (p = (struct proc *)allproc; p != NULL; p = p->p_nxt) {
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if (p->p_flag & SSYS)
continue;
if (p->p_stat) {
switch (p->p_stat) {
case SSLEEP:
if (p->p_pri <= PZERO && p->p_slptime == 0)
nrun++;
/* fall through */
case SSTOP:
#ifdef notdef
if (p->p_flag & SPAGE)
total.t_pw++;
else
#endif
if (p->p_flag & SLOAD) {
if (p->p_pri <= PZERO)
total.t_dw++;
else if (p->p_slptime < maxslp)
total.t_sl++;
} else if (p->p_slptime < maxslp)
total.t_sw++;
if (p->p_slptime < maxslp)
goto active;
break;
case SRUN:
case SIDL:
nrun++;
if (p->p_flag & SLOAD)
total.t_rq++;
else
total.t_sw++;
active:
break;
}
}
}
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/* XXXX */
loadav(averunnable.ldavg, nrun);
averunnable.fscale = FSCALE;
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}
/*
* Constants for averages over 1, 5, and 15 minutes
* when sampling at 5 second intervals.
*/
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.
*/
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static void
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loadav(avg, n)
register fixpt_t *avg;
int n;
{
register int i;
for (i = 0; i < 3; i++)
avg[i] = (cexp[i] * avg[i] + n * FSCALE * (FSCALE - cexp[i]))
>> FSHIFT;
#if defined(COMPAT_43) && (defined(vax) || defined(tahoe))
for (i = 0; i < 3; i++)
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avenrun[i] = (double) averunnable.ldavg[i] / FSCALE;
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#endif /* COMPAT_43 */
}
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/*
* Get load average (i.e. avenrunnable, via kinfo).
*/
/* ARGSUSED */
kinfo_loadavg(op, where, acopysize, arg, aneeded)
int op;
char *where;
int *acopysize, arg, *aneeded;
{
int error;
if (where == NULL || acopysize == NULL) {
*aneeded = sizeof(struct loadavg);
return 0;
}
if (*acopysize != sizeof(struct loadavg)) {
*aneeded = sizeof(struct loadavg);
*acopysize = 0;
return 0;
}
*aneeded = 0;
return copyout(&averunnable, where, *acopysize);
}