uvm_meter.c

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Author : deraadt
Date : 2026-02-17 03:28:41
Hash : 149bd828
Message : Reuse an unused field in uvmexp, and introduce swpskip. In the near future, this will count how many times pages are not sent to swap because the pagedaemon detects the swap system won't be able to deliver results (and toss the cluster of pages back) ok beck
sys/uvm/uvm_meter.c
/*	$OpenBSD: uvm_meter.c,v 1.56 2026/02/17 03:28:41 deraadt Exp $	*/
/*	$NetBSD: uvm_meter.c,v 1.21 2001/07/14 06:36:03 matt 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. 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/systm.h>
#include <sys/kernel.h>
#include <sys/percpu.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <uvm/uvm.h>
#include <uvm/uvm_ddb.h>

#ifdef UVM_SWAP_ENCRYPT
#include <uvm/uvm_swap.h>
#include <uvm/uvm_swap_encrypt.h>
#endif

/*
 * The time for a process to be blocked before being very swappable.
 * This is a number of seconds which the system takes as being a non-trivial
 * amount of real time.  You probably shouldn't change this;
 * it is used in subtle ways (fractions and multiples of it are, that is, like
 * half of a ``long time'', almost a long time, etc.)
 * It is related to human patience and other factors which don't really
 * change over time.
 */
#define	MAXSLP	20

int maxslp = MAXSLP;	/* patchable ... */

extern struct loadavg averunnable;

void uvm_total(struct vmtotal *);
void uvmexp_read(struct uvmexp *);

char malloc_conf[16];

#ifndef SMALL_KERNEL
/*
 * uvm_sysctl: sysctl hook into UVM system.
 */
int
uvm_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
    size_t newlen, struct proc *p)
{
	struct process *pr = p->p_p;
	struct vmtotal vmtotals;
	struct uvmexp uexp;
	int rv, t;

	switch (name[0]) {
	case VM_SWAPENCRYPT:
#ifdef UVM_SWAP_ENCRYPT
		return (swap_encrypt_ctl(name + 1, namelen - 1, oldp, oldlenp,
					 newp, newlen, p));
#else
		return (EOPNOTSUPP);
#endif
	default:
		/* all sysctl names at this level are terminal */
		if (namelen != 1)
			return (ENOTDIR);		/* overloaded */
		break;
	}

	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:
		uvmexp_read(&uexp);
		return (sysctl_rdstruct(oldp, oldlenp, newp, &uexp,
		    sizeof(uexp)));

	case VM_NKMEMPAGES:
		return (sysctl_rdint(oldp, oldlenp, newp, nkmempages));

	case VM_PSSTRINGS:
		return (sysctl_rdstruct(oldp, oldlenp, newp, &pr->ps_strings,
		    sizeof(pr->ps_strings)));

	case VM_ANONMIN:
		t = uvmexp.anonminpct;
		rv = sysctl_int(oldp, oldlenp, newp, newlen, &t);
		if (rv) {
			return rv;
		}
		if (t + uvmexp.vtextminpct + uvmexp.vnodeminpct > 95 || t < 0) {
			return EINVAL;
		}
		uvmexp.anonminpct = t;
		uvmexp.anonmin = t * 256 / 100;
		return rv;

	case VM_VTEXTMIN:
		t = uvmexp.vtextminpct;
		rv = sysctl_int(oldp, oldlenp, newp, newlen, &t);
		if (rv) {
			return rv;
		}
		if (uvmexp.anonminpct + t + uvmexp.vnodeminpct > 95 || t < 0) {
			return EINVAL;
		}
		uvmexp.vtextminpct = t;
		uvmexp.vtextmin = t * 256 / 100;
		return rv;

	case VM_VNODEMIN:
		t = uvmexp.vnodeminpct;
		rv = sysctl_int(oldp, oldlenp, newp, newlen, &t);
		if (rv) {
			return rv;
		}
		if (uvmexp.anonminpct + uvmexp.vtextminpct + t > 95 || t < 0) {
			return EINVAL;
		}
		uvmexp.vnodeminpct = t;
		uvmexp.vnodemin = t * 256 / 100;
		return rv;

	case VM_MAXSLP:
		return (sysctl_rdint(oldp, oldlenp, newp, maxslp));

	case VM_USPACE:
		return (sysctl_rdint(oldp, oldlenp, newp, USPACE));

	case VM_MALLOC_CONF:
		return (sysctl_string(oldp, oldlenp, newp, newlen,
		    malloc_conf, sizeof(malloc_conf)));
	default:
		return (EOPNOTSUPP);
	}
	/* NOTREACHED */
}

/*
 * uvm_total: calculate the current state of the system.
 */
void
uvm_total(struct vmtotal *totalp)
{
	struct proc *p;
#if 0
	struct vm_map_entry *	entry;
	struct vm_map *map;
	int paging;
#endif

	memset(totalp, 0, sizeof *totalp);

	/* calculate process statistics */
	LIST_FOREACH(p, &allproc, p_list) {
		switch (p->p_stat) {
		case 0:
			continue;

		case SSLEEP:
		case SSTOP:
			totalp->t_sl++;
			break;
		case SRUN:
		case SONPROC:
			if (p == p->p_cpu->ci_schedstate.spc_idleproc)
				continue;
		/* FALLTHROUGH */
		case SIDL:
			totalp->t_rq++;
			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 = atomic_load_sint(&uvmexp.free);
	totalp->t_vm = uvmexp.npages - atomic_load_sint(&uvmexp.free) +
	    atomic_load_sint(&uvmexp.swpginuse);
	totalp->t_avm = atomic_load_sint(&uvmexp.active) +
	    atomic_load_sint(&uvmexp.swpginuse);	/* XXX */
	totalp->t_rm = uvmexp.npages - atomic_load_sint(&uvmexp.free);
	totalp->t_arm = atomic_load_sint(&uvmexp.active);
	totalp->t_vmshr = 0;		/* XXX */
	totalp->t_avmshr = 0;		/* XXX */
	totalp->t_rmshr = 0;		/* XXX */
	totalp->t_armshr = 0;		/* XXX */
}

void
uvmexp_read(struct uvmexp *uexp)
{
	uint64_t counters[exp_ncounters], scratch[exp_ncounters];

	memcpy(uexp, &uvmexp, sizeof(*uexp));

	counters_read(uvmexp_counters, counters, exp_ncounters, scratch);

	/* stat counters */
	uexp->faults = (int)counters[faults];
	uexp->pageins = (int)counters[pageins];

	/* fault subcounters */
	uexp->fltnoram = (int)counters[flt_noram];
	uexp->fltnoanon = (int)counters[flt_noanon];
	uexp->fltnoamap = (int)counters[flt_noamap];
	uexp->fltpgwait = (int)counters[flt_pgwait];
	uexp->fltpgrele = (int)counters[flt_pgrele];
	uexp->fltrelck = (int)counters[flt_relck];
	uexp->fltnorelck = (int)counters[flt_norelck];
	uexp->fltanget = (int)counters[flt_anget];
	uexp->fltanretry = (int)counters[flt_anretry];
	uexp->fltamcopy = (int)counters[flt_amcopy];
	uexp->fltnamap = (int)counters[flt_namap];
	uexp->fltnomap = (int)counters[flt_nomap];
	uexp->fltlget = (int)counters[flt_lget];
	uexp->fltget = (int)counters[flt_get];
	uexp->flt_anon = (int)counters[flt_anon];
	uexp->flt_acow = (int)counters[flt_acow];
	uexp->flt_obj = (int)counters[flt_obj];
	uexp->flt_prcopy = (int)counters[flt_prcopy];
	uexp->flt_przero = (int)counters[flt_przero];
	uexp->fltup = (int)counters[flt_up];
	uexp->fltnoup = (int)counters[flt_noup];
}
#endif /* SMALL_KERNEL */

#ifdef DDB

/*
 * uvmexp_print: ddb hook to print interesting uvm counters
 */
void
uvmexp_print(int (*pr)(const char *, ...))
{
	struct uvmexp uexp;

	uvmexp_read(&uexp);

	(*pr)("Current UVM status:\n");
	(*pr)("  pagesize=%d (0x%x), pagemask=0x%x, pageshift=%d\n",
	    uexp.pagesize, uexp.pagesize, uexp.pagemask,
	    uexp.pageshift);
	(*pr)("  %d VM pages: %d active, %d inactive, %d wired, %d free (%d zero)\n",
	    uexp.npages, uexp.active, uexp.inactive, uexp.wired,
	    uexp.free, uexp.zeropages);
	(*pr)("  freemin=%d, free-target=%d, inactive-target=%d, "
	    "wired-max=%d\n", uexp.freemin, uexp.freetarg, uexp.inactarg,
	    uexp.wiredmax);
	(*pr)("  faults=%d, traps=%d, intrs=%d, ctxswitch=%d fpuswitch=%d\n",
	    uexp.faults, uexp.traps, uexp.intrs, uexp.swtch,
	    uexp.fpswtch);
	(*pr)("  softint=%d, syscalls=%d, kmapent=%d\n",
	    uexp.softs, uexp.syscalls, uexp.kmapent);

	(*pr)("  fault counts:\n");
	(*pr)("    noram=%d, noanon=%d, noamap=%d, pgwait=%d, pgrele=%d\n",
	    uexp.fltnoram, uexp.fltnoanon, uexp.fltnoamap,
	    uexp.fltpgwait, uexp.fltpgrele);
	(*pr)("    relocks=%d(%d), upgrades=%d(%d) anget(retries)=%d(%d), "
	    "amapcopy=%d\n", uexp.fltrelck, uexp.fltnorelck, uexp.fltup,
	    uexp.fltnoup, uexp.fltanget, uexp.fltanretry, uexp.fltamcopy);
	(*pr)("    neighbor anon/obj pg=%d/%d, gets(lock/unlock)=%d/%d\n",
	    uexp.fltnamap, uexp.fltnomap, uexp.fltlget, uexp.fltget);
	(*pr)("    cases: anon=%d, anoncow=%d, obj=%d, prcopy=%d, przero=%d\n",
	    uexp.flt_anon, uexp.flt_acow, uexp.flt_obj, uexp.flt_prcopy,
	    uexp.flt_przero);

	(*pr)("  daemon and swap counts:\n");
	(*pr)("    woke=%d, revs=%d, scans=%d, obscans=%d, anscans=%d\n",
	    uexp.pdwoke, uexp.pdrevs, uexp.pdscans, uexp.pdobscan,
	    uexp.pdanscan);
	(*pr)("    busy=%d, freed=%d, reactivate=%d, deactivate=%d\n",
	    uexp.pdbusy, uexp.pdfreed, uexp.pdreact, uexp.pddeact);
	(*pr)("    pageouts=%d, pending=%d, nswget=%d\n", uexp.pdpageouts,
	    uexp.pdpending, uexp.nswget);
	(*pr)("    nswapdev=%d, swpskip=%d\n",
	    uexp.nswapdev, uexp.swpskip);
	(*pr)("    swpages=%d, swpginuse=%d, swpgonly=%d paging=%d\n",
	    uexp.swpages, uexp.swpginuse, uexp.swpgonly, uexp.paging);

	(*pr)("  kernel pointers:\n");
	(*pr)("    objs(kern)=%p\n", uvm.kernel_object);
}
#endif
IABSD.fr/src/sys/uvm/uvm_meter.c

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IABSD.fr/src /sys/uvm/uvm_meter.c
