/*
 * (MPSAFE)
 *
 * 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
 * $FreeBSD: src/sys/vm/vm_meter.c,v 1.34.2.7 2002/10/10 19:28:22 dillon Exp $
 */

#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/resource.h>
#include <sys/vmmeter.h>
#include <sys/kcollect.h>

#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_extern.h>
#include <vm/vm_param.h>
#include <sys/lock.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <sys/sysctl.h>

/*
 * WARNING: vmstats represents the final say, but individual cpu's may
 *	    accumualte adjustments in gd->gd_vmstats_adj.  These are
 *	    synchronized to the global vmstats in hardclock.
 *
 *	    In addition, most individual cpus check vmstats using a local
 *	    copy of the global vmstats in gd->gd_vmstats.  Hardclock also
 *	    sychronizes the copy.  The pageout code and vm_page_alloc will
 *	    also synchronize their local copies as necessary.
 *
 *	    Other consumers should not expect perfect values.
 */
__exclusive_cache_line struct vmstats vmstats;

static int maxslp = MAXSLP;

SYSCTL_ULONG(_vm, VM_V_FREE_MIN, v_free_min,
	CTLFLAG_RW, &vmstats.v_free_min, 0,
	"Minimum number of pages desired free");
SYSCTL_ULONG(_vm, VM_V_PAGING_WAIT, v_paging_wait,
	CTLFLAG_RW, &vmstats.v_paging_wait, 0,
	"Userland slows down allocations");
SYSCTL_ULONG(_vm, VM_V_PAGING_START, v_paging_start,
	CTLFLAG_RW, &vmstats.v_paging_start, 0,
	"Pageout daemon begins running");
SYSCTL_ULONG(_vm, VM_V_PAGING_TARGET1, v_paging_target1,
	CTLFLAG_RW, &vmstats.v_paging_target1, 0,
	"Mid pageout daemon target");
SYSCTL_ULONG(_vm, VM_V_PAGING_TARGET2, v_paging_target2,
	CTLFLAG_RW, &vmstats.v_paging_target2, 0,
	"Final pageout daemon target");
SYSCTL_ULONG(_vm, VM_V_FREE_RESERVED, v_free_reserved,
	CTLFLAG_RW, &vmstats.v_free_reserved, 0,
	"Number of pages reserved for deadlock");
SYSCTL_ULONG(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
	CTLFLAG_RW, &vmstats.v_inactive_target, 0,
	"Maximum inactive pages during pageout");
SYSCTL_ULONG(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
	CTLFLAG_RW, &vmstats.v_pageout_free_min, 0,
	"Min number pages reserved for kernel");
SYSCTL_ULONG(_vm, OID_AUTO, v_free_severe,
	CTLFLAG_RW, &vmstats.v_free_severe, 0, "");

SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg,
	CTLFLAG_RD | CTLFLAG_NOLOCK,
	&averunnable, loadavg, "Machine loadaverage history");

static int do_vmtotal_callback(struct proc *p, void *data);

/*
 * No requirements.
 */
static int
do_vmtotal(SYSCTL_HANDLER_ARGS)
{
	struct vmtotal total;
	globaldata_t gd;
	int n;

	bzero(&total, sizeof(total));
	for (n = 0; n < ncpus; ++n) {
		gd = globaldata_find(n);

		/* total.t_rq calculated separately */
		/* total.t_dw calculated separately */
		/* total.t_pw calculated separately */
		/* total.t_sl calculated separately */
		/* total.t_sw calculated separately */
		total.t_vm += gd->gd_vmtotal.t_vm;
		total.t_avm += gd->gd_vmtotal.t_avm;
		total.t_rm += gd->gd_vmtotal.t_rm;
		total.t_arm += gd->gd_vmtotal.t_arm;
		total.t_vmshr += gd->gd_vmtotal.t_vmshr;
		total.t_avmshr += gd->gd_vmtotal.t_avmshr;
		total.t_rmshr += gd->gd_vmtotal.t_rmshr;
		total.t_armshr += gd->gd_vmtotal.t_armshr;
		/* total.t_free calculated separately */
	}

	/*
	 * Calculate process statistics.
	 */
	allproc_scan(do_vmtotal_callback, &total, 0);

	/*
	 * Adjust for sysctl return.  Add real memory into virtual memory.
	 * Set t_free.
	 *
	 * t_rm - Real memory
	 * t_vm - Virtual memory (real + swap)
	 */
	total.t_vm += total.t_rm;
	total.t_free = vmstats.v_free_count + vmstats.v_cache_count;

	return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
}

static int
do_vmtotal_callback(struct proc *p, void *data)
{
	struct vmtotal *totalp = data;
	struct lwp *lp;

	if (p->p_flags & P_SYSTEM)
		return(0);

	lwkt_gettoken_shared(&p->p_token);

	FOREACH_LWP_IN_PROC(lp, p) {
		switch (lp->lwp_stat) {
		case LSSTOP:
		case LSSLEEP:
			if ((lp->lwp_flags & LWP_SINTR) == 0)
				totalp->t_dw++;
			else if (lp->lwp_slptime < maxslp)
				totalp->t_sl++;
			if (lp->lwp_slptime >= maxslp)
				goto out;
			break;
		case LSRUN:
			totalp->t_rq++;
			if (p->p_stat == SIDL)
				goto out;
			break;
		default:
			goto out;
		}

		/*
		 * Set while in vm_fault()
		 */
		if (lp->lwp_flags & LWP_PAGING)
			totalp->t_pw++;
	}
out:
	lwkt_reltoken(&p->p_token);
	return(0);
}

/*
 * No requirements.
 */
static int
do_vmstats(SYSCTL_HANDLER_ARGS)
{
	struct vmstats vms = vmstats;
	return (sysctl_handle_opaque(oidp, &vms, sizeof(vms), req));
}

/*
 * No requirements.
 */
static int
do_vmmeter(SYSCTL_HANDLER_ARGS)
{
	int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
	int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
	struct vmmeter vmm;
	int i;

	bzero(&vmm, sizeof(vmm));
	for (i = 0; i < ncpus; ++i) {
		int off;
		struct globaldata *gd = globaldata_find(i);

		for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
			*(u_int *)((char *)&vmm + off) +=
				*(u_int *)((char *)&gd->gd_cnt + off);
		}

	}
	vmm.v_intr += vmm.v_ipi + vmm.v_timer;
	return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
}

/*
 * vcnt() -	accumulate statistics from the cnt structure for each cpu
 *
 *	The vmmeter structure is now per-cpu as well as global.  Those
 *	statistics which can be kept on a per-cpu basis (to avoid cache
 *	stalls between cpus) can be moved to the per-cpu vmmeter.  Remaining
 *	statistics, such as v_free_reserved, are left in the global
 *	structure.
 *
 * (sysctl_oid *oidp, void *arg1, int arg2, struct sysctl_req *req)
 *
 * No requirements.
 */
static int
vcnt(SYSCTL_HANDLER_ARGS)
{
	int i;
	int count = 0;
	int offset = arg2;

	for (i = 0; i < ncpus; ++i) {
		struct globaldata *gd = globaldata_find(i);
		count += *(int *)((char *)&gd->gd_cnt + offset);
	}
	return(SYSCTL_OUT(req, &count, sizeof(int)));
}

/*
 * No requirements.
 */
static int
vcnt_intr(SYSCTL_HANDLER_ARGS)
{
	int i;
	int count = 0;

	for (i = 0; i < ncpus; ++i) {
		struct globaldata *gd = globaldata_find(i);

		count += gd->gd_cnt.v_intr + gd->gd_cnt.v_ipi +
			 gd->gd_cnt.v_timer;
	}
	return(SYSCTL_OUT(req, &count, sizeof(int)));
}

#define VMMETEROFF(var)	offsetof(struct vmmeter, var)

SYSCTL_PROC(_vm, OID_AUTO, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
    0, sizeof(struct vmtotal), do_vmtotal, "S,vmtotal",
    "System virtual memory aggregate");
SYSCTL_PROC(_vm, OID_AUTO, vmstats, CTLTYPE_OPAQUE|CTLFLAG_RD,
    0, sizeof(struct vmstats), do_vmstats, "S,vmstats",
    "System virtual memory statistics");
SYSCTL_PROC(_vm, OID_AUTO, vmmeter, CTLTYPE_OPAQUE|CTLFLAG_RD,
    0, sizeof(struct vmmeter), do_vmmeter, "S,vmmeter",
    "System statistics");
SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0, "VM meter sys stats");
SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0, "VM meter vm stats");
SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");

SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_swtch, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_swtch), vcnt, "IU", "Context switches");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_coll, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_intrans_coll), vcnt, "IU", "Intransit map collisions (total)");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intrans_wait, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_intrans_wait), vcnt, "IU", "Intransit map collisions which blocked");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_ints, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_forwarded_ints), vcnt, "IU", "Forwarded interrupts due to MP lock");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_hits, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_forwarded_hits), vcnt, "IU", "Forwarded hits due to MP lock");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_forwarded_misses, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_forwarded_misses), vcnt, "IU", "Forwarded misses due to MP lock");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_trap), vcnt, "IU", "Traps");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_syscall), vcnt, "IU", "Syscalls");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_intr), vcnt_intr, "IU", "Hardware interrupts");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_ipi, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_ipi), vcnt, "IU", "Inter-processor interrupts");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_timer, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_timer), vcnt, "IU", "LAPIC timer interrupts");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_soft), vcnt, "IU", "Software interrupts");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vm_faults), vcnt, "IU", "VM faults");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_cow_faults), vcnt, "IU", "COW faults");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_cow_optim), vcnt, "IU", "Optimized COW faults");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_zfod), vcnt, "IU", "Zero fill");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_ozfod), vcnt, "IU", "Optimized zero fill");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_swapin), vcnt, "IU", "Swapin operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_swapout), vcnt, "IU", "Swapout operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_swappgsin), vcnt, "IU", "Swapin pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_swappgsout), vcnt, "IU", "Swapout pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vnodein), vcnt, "IU", "Vnodein operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vnodeout), vcnt, "IU", "Vnodeout operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vnodepgsin), vcnt, "IU", "Vnodein pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vnodepgsout), vcnt, "IU", "Vnodeout pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_intrans), vcnt, "IU", "In transit page blocking");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_reactivated), vcnt, "IU", "Reactivated pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_pdwakeups), vcnt, "IU", "Pagedaemon wakeups");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ppwakeups, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_ppwakeups), vcnt, "IU", "vm_wait wakeups");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_pdpages), vcnt, "IU", "Pagedaemon page scans");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_dfree), vcnt, "IU", "Pages freed by daemon");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_pfree), vcnt, "IU", "Pages freed by exiting processes");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_tfree), vcnt, "IU", "Total pages freed");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_forks), vcnt, "IU", "Number of fork() calls");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vforks), vcnt, "IU", "Number of vfork() calls");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_rforks), vcnt, "IU", "Number of rfork() calls");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_kthreads), vcnt, "IU", "Number of fork() calls by kernel");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_forkpages), vcnt, "IU", "VM pages affected by fork()");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_vforkpages), vcnt, "IU", "VM pages affected by vfork()");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_rforkpages), vcnt, "IU", "VM pages affected by rfork()");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
	0, VMMETEROFF(v_kthreadpages), vcnt, "IU", "VM pages affected by fork() by kernel");

SYSCTL_UINT(_vm_stats_vm, OID_AUTO,
	v_page_size, CTLFLAG_RD, &vmstats.v_page_size, 0,
	"Page size in bytes");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_page_count, CTLFLAG_RD, &vmstats.v_page_count, 0,
	"Total number of pages in system");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_free_reserved, CTLFLAG_RD, &vmstats.v_free_reserved, 0,
	"Number of pages reserved for deadlock");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_free_min, CTLFLAG_RD, &vmstats.v_free_min, 0,
	"Minimum number of pages desired free");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_paging_wait, CTLFLAG_RW, &vmstats.v_paging_wait, 0,
	"Userland slows down allocations");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_paging_start, CTLFLAG_RW, &vmstats.v_paging_start, 0,
	"Pageout daemon begins running");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_paging_target1, CTLFLAG_RW, &vmstats.v_paging_target1, 0,
	"Mid pageout daemon target");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_paging_target2, CTLFLAG_RW, &vmstats.v_paging_target2, 0,
	"Final pageout daemon target");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_free_count, CTLFLAG_RD, &vmstats.v_free_count, 0,
	"Number of pages free");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_wire_count, CTLFLAG_RD, &vmstats.v_wire_count, 0,
	"Number of pages wired down");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_active_count, CTLFLAG_RD, &vmstats.v_active_count, 0,
	"Number of pages active");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_inactive_target, CTLFLAG_RD, &vmstats.v_inactive_target, 0,
	"Maximum inactive pages during pageout");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_inactive_count, CTLFLAG_RD, &vmstats.v_inactive_count, 0,
	"Number of pages inactive");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_cache_count, CTLFLAG_RD, &vmstats.v_cache_count, 0,
	"Number of pages on buffer cache queue");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_pageout_free_min, CTLFLAG_RD, &vmstats.v_pageout_free_min, 0,
	"Min number pages reserved for kernel");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO,
	v_interrupt_free_min, CTLFLAG_RD, &vmstats.v_interrupt_free_min, 0,
	"Reserved number of pages for int code");

/*
 * Callback for per-cpu vmmeter structure.  Unlike the global structure,
 * we don't have to aggregate anything.
 *
 * No requirements.
 */
static int
do_vmmeter_pcpu(SYSCTL_HANDLER_ARGS)
{
	struct globaldata *gd = arg1;
	struct vmmeter vmm;

	vmm = gd->gd_cnt;
	vmm.v_intr += vmm.v_ipi + vmm.v_timer;
	return (sysctl_handle_opaque(oidp, &vmm, sizeof(vmm), req));
}

/*
 * Callback for long-term slow data collection on 10-second interval.
 *
 * Return faults, set data for other entries.
 */
#define PTOB(value)	((uint64_t)(value) << PAGE_SHIFT)

static uint64_t
collect_vmstats_callback(int n)
{
	static struct vmmeter last_vmm;
	struct vmmeter cur_vmm;
	const int boffset = offsetof(struct vmmeter, vmmeter_uint_begin);
	const int eoffset = offsetof(struct vmmeter, vmmeter_uint_end);
	uint64_t total;

	/*
	 * The hardclock already rolls up vmstats for us.
	 */
	kcollect_setvalue(KCOLLECT_MEMFRE, PTOB(vmstats.v_free_count));
	kcollect_setvalue(KCOLLECT_MEMCAC, PTOB(vmstats.v_cache_count));
	kcollect_setvalue(KCOLLECT_MEMINA, PTOB(vmstats.v_inactive_count));
	kcollect_setvalue(KCOLLECT_MEMACT, PTOB(vmstats.v_active_count));
	kcollect_setvalue(KCOLLECT_MEMWIR, PTOB(vmstats.v_wire_count));

	/*
	 * Collect pcpu statistics for things like faults.
	 */
	bzero(&cur_vmm, sizeof(cur_vmm));
        for (n = 0; n < ncpus; ++n) {
                struct globaldata *gd = globaldata_find(n);
                int off;

                for (off = boffset; off <= eoffset; off += sizeof(u_int)) {
                        *(u_int *)((char *)&cur_vmm + off) +=
                                *(u_int *)((char *)&gd->gd_cnt + off);
                }

        }

	total = cur_vmm.v_cow_faults - last_vmm.v_cow_faults;
	last_vmm.v_cow_faults = cur_vmm.v_cow_faults;
	kcollect_setvalue(KCOLLECT_COWFAULT, total);

	total = cur_vmm.v_zfod - last_vmm.v_zfod;
	last_vmm.v_zfod = cur_vmm.v_zfod;
	kcollect_setvalue(KCOLLECT_ZFILL, total);

	total = cur_vmm.v_syscall - last_vmm.v_syscall;
	last_vmm.v_syscall = cur_vmm.v_syscall;
	kcollect_setvalue(KCOLLECT_SYSCALLS, total);

	total = cur_vmm.v_intr - last_vmm.v_intr;
	last_vmm.v_intr = cur_vmm.v_intr;
	kcollect_setvalue(KCOLLECT_INTR, total);

	total = cur_vmm.v_ipi - last_vmm.v_ipi;
	last_vmm.v_ipi = cur_vmm.v_ipi;
	kcollect_setvalue(KCOLLECT_IPI, total);

	total = cur_vmm.v_timer - last_vmm.v_timer;
	last_vmm.v_timer = cur_vmm.v_timer;
	kcollect_setvalue(KCOLLECT_TIMER, total);

	total = cur_vmm.v_vm_faults - last_vmm.v_vm_faults;
	last_vmm.v_vm_faults = cur_vmm.v_vm_faults;

	return total;
}

/*
 * Called from the low level boot code only.
 */
static void
vmmeter_init(void *dummy __unused)
{
	int i;

	for (i = 0; i < ncpus; ++i) {
		struct sysctl_ctx_list *ctx;
		struct sysctl_oid *oid;
		struct globaldata *gd;
		char name[32];

		ksnprintf(name, sizeof(name), "cpu%d", i);

		ctx = kmalloc(sizeof(*ctx), M_TEMP, M_WAITOK);
		sysctl_ctx_init(ctx);
		oid = SYSCTL_ADD_NODE(ctx, SYSCTL_STATIC_CHILDREN(_vm),
				      OID_AUTO, name, CTLFLAG_RD, 0, "");

		gd = globaldata_find(i);
		SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
				"vmmeter", CTLTYPE_OPAQUE|CTLFLAG_RD,
				gd, sizeof(struct vmmeter), do_vmmeter_pcpu,
				"S,vmmeter", "System per-cpu statistics");
	}
	kcollect_register(KCOLLECT_VMFAULT, "fault", collect_vmstats_callback,
			  KCOLLECT_SCALE(KCOLLECT_VMFAULT_FORMAT, 0));
	kcollect_register(KCOLLECT_COWFAULT, "cow", NULL,
			  KCOLLECT_SCALE(KCOLLECT_COWFAULT_FORMAT, 0));
	kcollect_register(KCOLLECT_ZFILL, "zfill", NULL,
			  KCOLLECT_SCALE(KCOLLECT_ZFILL_FORMAT, 0));

	kcollect_register(KCOLLECT_MEMFRE, "free", NULL,
			  KCOLLECT_SCALE(KCOLLECT_MEMFRE_FORMAT,
					 PTOB(vmstats.v_page_count)));
	kcollect_register(KCOLLECT_MEMCAC, "cache", NULL,
			  KCOLLECT_SCALE(KCOLLECT_MEMCAC_FORMAT,
					 PTOB(vmstats.v_page_count)));
	kcollect_register(KCOLLECT_MEMINA, "inact", NULL,
			  KCOLLECT_SCALE(KCOLLECT_MEMINA_FORMAT,
					 PTOB(vmstats.v_page_count)));
	kcollect_register(KCOLLECT_MEMACT, "act", NULL,
			  KCOLLECT_SCALE(KCOLLECT_MEMACT_FORMAT,
					 PTOB(vmstats.v_page_count)));
	kcollect_register(KCOLLECT_MEMWIR, "wired", NULL,
			  KCOLLECT_SCALE(KCOLLECT_MEMWIR_FORMAT,
					 PTOB(vmstats.v_page_count)));

	kcollect_register(KCOLLECT_SYSCALLS, "syscalls", NULL,
			  KCOLLECT_SCALE(KCOLLECT_SYSCALLS_FORMAT, 0));

	kcollect_register(KCOLLECT_INTR, "intr", NULL,
			  KCOLLECT_SCALE(KCOLLECT_INTR_FORMAT, 0));
	kcollect_register(KCOLLECT_IPI, "ipi", NULL,
			  KCOLLECT_SCALE(KCOLLECT_IPI_FORMAT, 0));
	kcollect_register(KCOLLECT_TIMER, "timer", NULL,
			  KCOLLECT_SCALE(KCOLLECT_TIMER_FORMAT, 0));
}
SYSINIT(vmmeter, SI_SUB_PSEUDO, SI_ORDER_ANY, vmmeter_init, 0);

/*
 * Rolls up accumulated pcpu adjustments to vmstats counts into the global
 * structure, copy the global structure into our pcpu structure.  Critical
 * path checks will use our pcpu structure.
 *
 * This is somewhat expensive and only called when needed, and by the
 * hardclock.
 */
void
vmstats_rollup(void)
{
	int cpu;

	for (cpu = 0; cpu < ncpus; ++cpu) {
		vmstats_rollup_cpu(globaldata_find(cpu));
	}
	mycpu->gd_vmstats = vmstats;
}

void
vmstats_rollup_cpu(globaldata_t gd)
{
	long value;

	if (gd->gd_vmstats_adj.v_free_count) {
		value = atomic_swap_long(&gd->gd_vmstats_adj.v_free_count, 0);
		atomic_add_long(&vmstats.v_free_count, value);
	}
	if (gd->gd_vmstats_adj.v_cache_count) {
		value = atomic_swap_long(&gd->gd_vmstats_adj.v_cache_count, 0);
		atomic_add_long(&vmstats.v_cache_count, value);
	}
	if (gd->gd_vmstats_adj.v_inactive_count) {
		value=atomic_swap_long(&gd->gd_vmstats_adj.v_inactive_count, 0);
		atomic_add_long(&vmstats.v_inactive_count, value);
	}
	if (gd->gd_vmstats_adj.v_active_count) {
		value = atomic_swap_long(&gd->gd_vmstats_adj.v_active_count, 0);
		atomic_add_long(&vmstats.v_active_count, value);
	}
	if (gd->gd_vmstats_adj.v_wire_count) {
		value = atomic_swap_long(&gd->gd_vmstats_adj.v_wire_count, 0);
		atomic_add_long(&vmstats.v_wire_count, value);
	}
}