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NetBSD/sys/uvm/uvm_meter.c

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/* $NetBSD: uvm_meter.c,v 1.48 2008/04/24 15:35:31 ad 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_meter.c,v 1.48 2008/04/24 15:35:31 ad Exp $");
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <uvm/uvm_extern.h>
#include <uvm/uvm_pdpolicy.h>
/*
* maxslp: ???? XXXCDC
*/
int maxslp = MAXSLP; /* patchable ... */
struct loadavg averunnable;
/*
* constants for averages over 1, 5, and 15 minutes when sampling at
* 5 second intervals.
*/
static const 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(struct loadavg *);
static void uvm_total(struct vmtotal *);
/*
* uvm_meter: calculate load average and wake up the swapper (if needed)
*/
void
uvm_meter(void)
{
static int count;
if (++count >= 5) {
count = 0;
uvm_loadav(&averunnable);
}
if (lwp0.l_slptime > (maxslp / 2))
uvm_kick_scheduler();
}
/*
* uvm_loadav: compute a tenex style load average of a quantity on
* 1, 5, and 15 minute intervals.
*/
static void
uvm_loadav(struct loadavg *avg)
{
int i, nrun;
struct lwp *l;
nrun = 0;
mutex_enter(proc_lock);
LIST_FOREACH(l, &alllwp, l_list) {
if ((l->l_flag & (LW_SINTR | LW_SYSTEM)) != 0)
continue;
switch (l->l_stat) {
case LSSLEEP:
if (l->l_slptime > 1)
continue;
/* fall through */
case LSRUN:
case LSONPROC:
case LSIDL:
nrun++;
}
}
mutex_exit(proc_lock);
for (i = 0; i < 3; i++)
avg->ldavg[i] = (cexp[i] * avg->ldavg[i] +
nrun * FSCALE * (FSCALE - cexp[i])) >> FSHIFT;
}
/*
* sysctl helper routine for the vm.vmmeter node.
*/
static int
sysctl_vm_meter(SYSCTLFN_ARGS)
{
struct sysctlnode node;
struct vmtotal vmtotals;
node = *rnode;
node.sysctl_data = &vmtotals;
uvm_total(&vmtotals);
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}
/*
* sysctl helper routine for the vm.uvmexp node.
*/
static int
sysctl_vm_uvmexp(SYSCTLFN_ARGS)
{
struct sysctlnode node;
node = *rnode;
if (oldp)
node.sysctl_size = min(*oldlenp, node.sysctl_size);
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}
static int
sysctl_vm_uvmexp2(SYSCTLFN_ARGS)
{
struct sysctlnode node;
struct uvmexp_sysctl u;
int active, inactive;
uvm_estimatepageable(&active, &inactive);
memset(&u, 0, sizeof(u));
/* Entries here are in order of uvmexp_sysctl, not uvmexp */
u.pagesize = uvmexp.pagesize;
u.pagemask = uvmexp.pagemask;
u.pageshift = uvmexp.pageshift;
u.npages = uvmexp.npages;
u.free = uvmexp.free;
u.active = active;
u.inactive = inactive;
u.paging = uvmexp.paging;
u.wired = uvmexp.wired;
u.zeropages = uvmexp.zeropages;
u.reserve_pagedaemon = uvmexp.reserve_pagedaemon;
u.reserve_kernel = uvmexp.reserve_kernel;
u.freemin = uvmexp.freemin;
u.freetarg = uvmexp.freetarg;
u.inactarg = 0; /* unused */
u.wiredmax = uvmexp.wiredmax;
u.nswapdev = uvmexp.nswapdev;
u.swpages = uvmexp.swpages;
u.swpginuse = uvmexp.swpginuse;
u.swpgonly = uvmexp.swpgonly;
u.nswget = uvmexp.nswget;
u.faults = uvmexp.faults;
u.traps = uvmexp.traps;
u.intrs = uvmexp.intrs;
u.swtch = uvmexp.swtch;
u.softs = uvmexp.softs;
u.syscalls = uvmexp.syscalls;
u.pageins = uvmexp.pageins;
u.swapins = uvmexp.swapins;
u.swapouts = uvmexp.swapouts;
u.pgswapin = uvmexp.pgswapin;
u.pgswapout = uvmexp.pgswapout;
u.forks = uvmexp.forks;
u.forks_ppwait = uvmexp.forks_ppwait;
u.forks_sharevm = uvmexp.forks_sharevm;
u.pga_zerohit = uvmexp.pga_zerohit;
u.pga_zeromiss = uvmexp.pga_zeromiss;
u.zeroaborts = uvmexp.zeroaborts;
u.fltnoram = uvmexp.fltnoram;
u.fltnoanon = uvmexp.fltnoanon;
u.fltpgwait = uvmexp.fltpgwait;
u.fltpgrele = uvmexp.fltpgrele;
u.fltrelck = uvmexp.fltrelck;
u.fltrelckok = uvmexp.fltrelckok;
u.fltanget = uvmexp.fltanget;
u.fltanretry = uvmexp.fltanretry;
u.fltamcopy = uvmexp.fltamcopy;
u.fltnamap = uvmexp.fltnamap;
u.fltnomap = uvmexp.fltnomap;
u.fltlget = uvmexp.fltlget;
u.fltget = uvmexp.fltget;
u.flt_anon = uvmexp.flt_anon;
u.flt_acow = uvmexp.flt_acow;
u.flt_obj = uvmexp.flt_obj;
u.flt_prcopy = uvmexp.flt_prcopy;
u.flt_przero = uvmexp.flt_przero;
u.pdwoke = uvmexp.pdwoke;
u.pdrevs = uvmexp.pdrevs;
u.pdswout = uvmexp.pdswout;
u.pdfreed = uvmexp.pdfreed;
u.pdscans = uvmexp.pdscans;
u.pdanscan = uvmexp.pdanscan;
u.pdobscan = uvmexp.pdobscan;
u.pdreact = uvmexp.pdreact;
u.pdbusy = uvmexp.pdbusy;
u.pdpageouts = uvmexp.pdpageouts;
u.pdpending = uvmexp.pdpending;
u.pddeact = uvmexp.pddeact;
u.anonpages = uvmexp.anonpages;
u.filepages = uvmexp.filepages;
u.execpages = uvmexp.execpages;
u.colorhit = uvmexp.colorhit;
u.colormiss = uvmexp.colormiss;
node = *rnode;
node.sysctl_data = &u;
node.sysctl_size = sizeof(u);
return (sysctl_lookup(SYSCTLFN_CALL(&node)));
}
/*
* sysctl helper routine for uvm_pctparam.
*/
static int
uvm_sysctlpctparam(SYSCTLFN_ARGS)
{
int t, error;
struct sysctlnode node;
struct uvm_pctparam *pct;
pct = rnode->sysctl_data;
t = pct->pct_pct;
node = *rnode;
node.sysctl_data = &t;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
if (t < 0 || t > 100)
return EINVAL;
error = uvm_pctparam_check(pct, t);
if (error) {
return error;
}
uvm_pctparam_set(pct, t);
return (0);
}
/*
* uvm_sysctl: sysctl hook into UVM system.
*/
SYSCTL_SETUP(sysctl_vm_setup, "sysctl vm subtree setup")
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vm", NULL,
NULL, 0, NULL, 0,
CTL_VM, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "vmmeter",
SYSCTL_DESCR("Simple system-wide virtual memory "
"statistics"),
sysctl_vm_meter, 0, NULL, sizeof(struct vmtotal),
CTL_VM, VM_METER, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "loadavg",
SYSCTL_DESCR("System load average history"),
NULL, 0, &averunnable, sizeof(averunnable),
CTL_VM, VM_LOADAVG, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "uvmexp",
SYSCTL_DESCR("Detailed system-wide virtual memory "
"statistics"),
sysctl_vm_uvmexp, 0, &uvmexp, sizeof(uvmexp),
CTL_VM, VM_UVMEXP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_INT, "nkmempages",
SYSCTL_DESCR("Default number of pages in kmem_map"),
NULL, 0, &nkmempages, 0,
CTL_VM, VM_NKMEMPAGES, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "uvmexp2",
SYSCTL_DESCR("Detailed system-wide virtual memory "
"statistics (MI)"),
sysctl_vm_uvmexp2, 0, NULL, 0,
CTL_VM, VM_UVMEXP2, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT, CTLTYPE_INT, "maxslp",
SYSCTL_DESCR("Maximum process sleep time before being "
"swapped"),
NULL, 0, &maxslp, 0,
CTL_VM, VM_MAXSLP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
CTLTYPE_INT, "uspace",
SYSCTL_DESCR("Number of bytes allocated for a kernel "
"stack"),
NULL, USPACE, NULL, 0,
CTL_VM, VM_USPACE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "idlezero",
SYSCTL_DESCR("Whether try to zero pages in idle loop"),
NULL, 0, &vm_page_zero_enable, 0,
CTL_VM, CTL_CREATE, CTL_EOL);
uvmpdpol_sysctlsetup();
}
/*
* uvm_total: calculate the current state of the system.
*/
static void
uvm_total(struct vmtotal *totalp)
{
struct lwp *l;
#if 0
struct vm_map_entry * entry;
struct vm_map *map;
int paging;
#endif
int active;
memset(totalp, 0, sizeof *totalp);
/*
* calculate process statistics
*/
mutex_enter(proc_lock);
LIST_FOREACH(l, &alllwp, l_list) {
if (l->l_proc->p_flag & PK_SYSTEM)
continue;
switch (l->l_stat) {
case 0:
continue;
case LSSLEEP:
case LSSTOP:
if (l->l_flag & LW_INMEM) {
if (lwp_eprio(l) <= PZERO)
totalp->t_dw++;
else if (l->l_slptime < maxslp)
totalp->t_sl++;
} else if (l->l_slptime < maxslp)
totalp->t_sw++;
if (l->l_slptime >= maxslp)
continue;
break;
case LSRUN:
case LSONPROC:
case LSIDL:
if (l->l_flag & LW_INMEM)
totalp->t_rq++;
else
totalp->t_sw++;
if (l->l_stat == LSIDL)
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
}
mutex_exit(proc_lock);
/*
* Calculate object memory usage statistics.
*/
uvm_estimatepageable(&active, NULL);
totalp->t_free = uvmexp.free;
totalp->t_vm = uvmexp.npages - uvmexp.free + uvmexp.swpginuse;
totalp->t_avm = active + uvmexp.swpginuse; /* XXX */
totalp->t_rm = uvmexp.npages - uvmexp.free;
totalp->t_arm = active;
totalp->t_vmshr = 0; /* XXX */
totalp->t_avmshr = 0; /* XXX */
totalp->t_rmshr = 0; /* XXX */
totalp->t_armshr = 0; /* XXX */
}
void
uvm_pctparam_set(struct uvm_pctparam *pct, int val)
{
pct->pct_pct = val;
pct->pct_scaled = val * UVM_PCTPARAM_SCALE / 100;
}
int
uvm_pctparam_get(struct uvm_pctparam *pct)
{
return pct->pct_pct;
}
int
uvm_pctparam_check(struct uvm_pctparam *pct, int val)
{
if (pct->pct_check == NULL) {
return 0;
}
return (*pct->pct_check)(pct, val);
}
void
uvm_pctparam_init(struct uvm_pctparam *pct, int val,
int (*fn)(struct uvm_pctparam *, int))
{
pct->pct_check = fn;
uvm_pctparam_set(pct, val);
}
int
uvm_pctparam_createsysctlnode(struct uvm_pctparam *pct, const char *name,
const char *desc)
{
return sysctl_createv(NULL, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, name, SYSCTL_DESCR(desc),
uvm_sysctlpctparam, 0, pct, 0, CTL_VM, CTL_CREATE, CTL_EOL);
}
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