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/* $NetBSD: uvm_meter.c,v 1.7 1998/08/09 22:36:39 perry 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>
#include <sys/exec.h>
#ifdef UVM_SWAP_ENCRYPT
#include <uvm/uvm_swap_encrypt.h>
#endif
/*
* 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 *));
/*
* 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;
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 SIDL:
nrun++;
}
}
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;
struct _ps_strings _ps = { PS_STRINGS };
/* 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_PSSTRINGS:
return (sysctl_rdstruct(oldp, oldlenp, newp, &_ps,
sizeof(_ps)));
#ifdef UVM_SWAP_ENCRYPT
case VM_SWAPENCRYPT:
return (sysctl_int(oldp, oldlenp, newp, newlen,
&uvm_doswapencrypt));
#endif
default:
return (EOPNOTSUPP);
}
/* NOTREACHED */
}
/*
* uvm_total: calculate the current state of the system.
*/
void
uvm_total(totalp)
struct vmtotal *totalp;
{
struct proc *p;
#if 0
vm_map_entry_t entry;
vm_map_t map;
int paging;
#endif
bzero(totalp, sizeof *totalp);
/*
* calculate process statistics
*/
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 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
}
/*
* 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 */
}
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