9c32bc786a
suggested by torek, because CSRG had problems with reordering of assignments to allproc leading to strange panics from kernels compiled with gcc2...
148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*
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* Copyright (c) 1982, 1986, 1989 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)vm_meter.c 7.11 (Berkeley) 4/20/91
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* $Id: vm_meter.c,v 1.5 1993/09/15 22:31:07 cgd Exp $
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*/
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#include "param.h"
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#include "proc.h"
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#include "systm.h"
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#include "kernel.h"
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#include "vm_param.h"
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#include "vmmeter.h"
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fixpt_t averunnable[3]; /* load average, of runnable procs */
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int maxslp = MAXSLP;
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#ifndef MACHINE_NONCONTIG
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int saferss = SAFERSS;
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#endif /* MACHINE_NONCONTIG */
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void
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vmmeter()
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{
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register unsigned *cp, *rp, *sp;
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if (time.tv_sec % 5 == 0)
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vmtotal();
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if (proc0.p_slptime > maxslp/2)
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wakeup((caddr_t)&proc0);
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}
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vmtotal()
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{
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register struct proc *p;
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int nrun = 0;
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total.t_vm = 0;
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total.t_avm = 0;
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total.t_rm = 0;
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total.t_arm = 0;
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total.t_rq = 0;
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total.t_dw = 0;
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total.t_pw = 0;
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total.t_sl = 0;
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total.t_sw = 0;
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for (p = (struct proc *)allproc; p != NULL; p = p->p_nxt) {
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if (p->p_flag & SSYS)
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continue;
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if (p->p_stat) {
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switch (p->p_stat) {
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case SSLEEP:
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if (p->p_pri <= PZERO && p->p_slptime == 0)
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nrun++;
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/* fall through */
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case SSTOP:
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#ifdef notdef
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if (p->p_flag & SPAGE)
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total.t_pw++;
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else
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#endif
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if (p->p_flag & SLOAD) {
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if (p->p_pri <= PZERO)
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total.t_dw++;
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else if (p->p_slptime < maxslp)
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total.t_sl++;
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} else if (p->p_slptime < maxslp)
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total.t_sw++;
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if (p->p_slptime < maxslp)
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goto active;
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break;
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case SRUN:
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case SIDL:
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nrun++;
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if (p->p_flag & SLOAD)
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total.t_rq++;
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else
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total.t_sw++;
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active:
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break;
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}
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}
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}
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loadav(averunnable, nrun);
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}
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/*
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* Constants for averages over 1, 5, and 15 minutes
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* when sampling at 5 second intervals.
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*/
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fixpt_t cexp[3] = {
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0.9200444146293232 * FSCALE, /* exp(-1/12) */
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0.9834714538216174 * FSCALE, /* exp(-1/60) */
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0.9944598480048967 * FSCALE, /* exp(-1/180) */
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};
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/*
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* Compute a tenex style load average of a quantity on
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* 1, 5 and 15 minute intervals.
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*/
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loadav(avg, n)
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register fixpt_t *avg;
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int n;
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{
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register int i;
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for (i = 0; i < 3; i++)
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avg[i] = (cexp[i] * avg[i] + n * FSCALE * (FSCALE - cexp[i]))
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>> FSHIFT;
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#if defined(COMPAT_43) && (defined(vax) || defined(tahoe))
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for (i = 0; i < 3; i++)
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avenrun[i] = (double) averunnable[i] / FSCALE;
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#endif /* COMPAT_43 */
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}
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