247 lines
6.2 KiB
C
247 lines
6.2 KiB
C
/* $NetBSD: uvm_meter.c,v 1.12 2000/05/26 00:36:53 thorpej Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California.
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*
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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 Charles D. Cranor,
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* Washington University, and the University of California, Berkeley
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* 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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* @(#)vm_meter.c 8.4 (Berkeley) 1/4/94
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* from: Id: uvm_meter.c,v 1.1.2.1 1997/08/14 19:10:35 chuck Exp
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*/
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <vm/vm.h>
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#include <sys/sysctl.h>
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/*
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* maxslp: ???? XXXCDC
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*/
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int maxslp = MAXSLP; /* patchable ... */
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struct loadavg averunnable; /* decl. */
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/*
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* constants for averages over 1, 5, and 15 minutes when sampling at
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* 5 second intervals.
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*/
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static 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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* prototypes
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*/
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static void uvm_loadav __P((struct loadavg *));
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static void uvm_total __P((struct vmtotal *));
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/*
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* uvm_meter: calculate load average and wake up the swapper (if needed)
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*/
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void
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uvm_meter()
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{
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if ((time.tv_sec % 5) == 0)
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uvm_loadav(&averunnable);
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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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/*
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* uvm_loadav: compute a tenex style load average of a quantity on
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* 1, 5, and 15 minute internvals.
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*/
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static void
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uvm_loadav(avg)
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struct loadavg *avg;
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{
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int i, nrun;
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struct proc *p;
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proclist_lock_read();
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for (nrun = 0, p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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switch (p->p_stat) {
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case SSLEEP:
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if (p->p_priority > PZERO || p->p_slptime > 1)
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continue;
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/* fall through */
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case SRUN:
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case SONPROC:
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case SIDL:
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nrun++;
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}
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}
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proclist_unlock_read();
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for (i = 0; i < 3; i++)
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avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
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nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
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}
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/*
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* uvm_sysctl: sysctl hook into UVM system.
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*/
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int
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uvm_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
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int *name;
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u_int namelen;
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void *oldp;
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size_t *oldlenp;
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void *newp;
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size_t newlen;
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struct proc *p;
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{
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struct vmtotal vmtotals;
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/* all sysctl names at this level are terminal */
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if (namelen != 1)
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return (ENOTDIR); /* overloaded */
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switch (name[0]) {
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case VM_LOADAVG:
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return (sysctl_rdstruct(oldp, oldlenp, newp, &averunnable,
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sizeof(averunnable)));
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case VM_METER:
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uvm_total(&vmtotals);
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return (sysctl_rdstruct(oldp, oldlenp, newp, &vmtotals,
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sizeof(vmtotals)));
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case VM_UVMEXP:
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return (sysctl_rdstruct(oldp, oldlenp, newp, &uvmexp,
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sizeof(uvmexp)));
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case VM_NKMEMPAGES:
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return (sysctl_rdint(oldp, oldlenp, newp, nkmempages));
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default:
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return (EOPNOTSUPP);
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}
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/* NOTREACHED */
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}
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/*
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* uvm_total: calculate the current state of the system.
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*/
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static void
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uvm_total(totalp)
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struct vmtotal *totalp;
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{
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struct proc *p;
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#if 0
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vm_map_entry_t entry;
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vm_map_t map;
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int paging;
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#endif
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memset(totalp, 0, sizeof *totalp);
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/*
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* calculate process statistics
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*/
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proclist_lock_read();
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for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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if (p->p_flag & P_SYSTEM)
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continue;
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switch (p->p_stat) {
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case 0:
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continue;
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case SSLEEP:
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case SSTOP:
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if (p->p_flag & P_INMEM) {
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if (p->p_priority <= PZERO)
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totalp->t_dw++;
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else if (p->p_slptime < maxslp)
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totalp->t_sl++;
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} else if (p->p_slptime < maxslp)
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totalp->t_sw++;
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if (p->p_slptime >= maxslp)
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continue;
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break;
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case SRUN:
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case SONPROC:
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case SIDL:
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if (p->p_flag & P_INMEM)
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totalp->t_rq++;
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else
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totalp->t_sw++;
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if (p->p_stat == SIDL)
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continue;
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break;
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}
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/*
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* note active objects
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*/
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#if 0
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/*
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* XXXCDC: BOGUS! rethink this. in the mean time
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* don't do it.
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*/
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paging = 0;
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vm_map_lock(map);
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for (map = &p->p_vmspace->vm_map, entry = map->header.next;
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entry != &map->header; entry = entry->next) {
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if (entry->is_a_map || entry->is_sub_map ||
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entry->object.uvm_obj == NULL)
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continue;
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/* XXX how to do this with uvm */
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}
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vm_map_unlock(map);
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if (paging)
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totalp->t_pw++;
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#endif
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}
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proclist_unlock_read();
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/*
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* Calculate object memory usage statistics.
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*/
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totalp->t_free = uvmexp.free;
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totalp->t_vm = uvmexp.npages - uvmexp.free + uvmexp.swpginuse;
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totalp->t_avm = uvmexp.active + uvmexp.swpginuse; /* XXX */
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totalp->t_rm = uvmexp.npages - uvmexp.free;
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totalp->t_arm = uvmexp.active;
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totalp->t_vmshr = 0; /* XXX */
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totalp->t_avmshr = 0; /* XXX */
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totalp->t_rmshr = 0; /* XXX */
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totalp->t_armshr = 0; /* XXX */
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}
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