328 lines
11 KiB
C
328 lines
11 KiB
C
/*-
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. 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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* 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resource.h>
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#include <sys/rwlock.h>
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#include <sys/sx.h>
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#include <sys/vmmeter.h>
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#include <sys/smp.h>
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <sys/sysctl.h>
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struct vmmeter vm_cnt;
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SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
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CTLFLAG_RW, &vm_cnt.v_free_min, 0, "Minimum low-free-pages threshold");
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SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
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CTLFLAG_RW, &vm_cnt.v_free_target, 0, "Desired free pages");
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SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
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CTLFLAG_RW, &vm_cnt.v_free_reserved, 0, "Pages reserved for deadlock");
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SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
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CTLFLAG_RW, &vm_cnt.v_inactive_target, 0, "Pages desired inactive");
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SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
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CTLFLAG_RW, &vm_cnt.v_pageout_free_min, 0, "Min pages reserved for kernel");
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SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
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CTLFLAG_RW, &vm_cnt.v_free_severe, 0, "Severe page depletion point");
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static int
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sysctl_vm_loadavg(SYSCTL_HANDLER_ARGS)
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{
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#ifdef SCTL_MASK32
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u_int32_t la[4];
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if (req->flags & SCTL_MASK32) {
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la[0] = averunnable.ldavg[0];
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la[1] = averunnable.ldavg[1];
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la[2] = averunnable.ldavg[2];
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la[3] = averunnable.fscale;
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return SYSCTL_OUT(req, la, sizeof(la));
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} else
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#endif
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return SYSCTL_OUT(req, &averunnable, sizeof(averunnable));
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}
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SYSCTL_PROC(_vm, VM_LOADAVG, loadavg, CTLTYPE_STRUCT | CTLFLAG_RD |
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CTLFLAG_MPSAFE, NULL, 0, sysctl_vm_loadavg, "S,loadavg",
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"Machine loadaverage history");
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/*
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* This function aims to determine if the object is mapped,
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* specifically, if it is referenced by a vm_map_entry. Because
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* objects occasionally acquire transient references that do not
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* represent a mapping, the method used here is inexact. However, it
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* has very low overhead and is good enough for the advisory
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* vm.vmtotal sysctl.
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*/
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static bool
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is_object_active(vm_object_t obj)
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{
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return (obj->ref_count > obj->shadow_count);
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}
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static int
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vmtotal(SYSCTL_HANDLER_ARGS)
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{
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struct vmtotal total;
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vm_object_t object;
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struct proc *p;
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struct thread *td;
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bzero(&total, sizeof(total));
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/*
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* Calculate process statistics.
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*/
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sx_slock(&allproc_lock);
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FOREACH_PROC_IN_SYSTEM(p) {
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if (p->p_flag & P_SYSTEM)
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continue;
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PROC_LOCK(p);
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switch (p->p_state) {
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case PRS_NEW:
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PROC_UNLOCK(p);
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continue;
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break;
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default:
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FOREACH_THREAD_IN_PROC(p, td) {
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thread_lock(td);
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switch (td->td_state) {
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case TDS_INHIBITED:
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if (TD_IS_SWAPPED(td))
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total.t_sw++;
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else if (TD_IS_SLEEPING(td)) {
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if (td->td_priority <= PZERO)
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total.t_dw++;
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else
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total.t_sl++;
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if (td->td_wchan ==
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&vm_cnt.v_free_count)
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total.t_pw++;
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}
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break;
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case TDS_CAN_RUN:
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total.t_sw++;
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break;
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case TDS_RUNQ:
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case TDS_RUNNING:
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total.t_rq++;
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thread_unlock(td);
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continue;
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default:
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break;
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}
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thread_unlock(td);
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}
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}
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PROC_UNLOCK(p);
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}
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sx_sunlock(&allproc_lock);
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/*
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* Calculate object memory usage statistics.
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*/
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mtx_lock(&vm_object_list_mtx);
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TAILQ_FOREACH(object, &vm_object_list, object_list) {
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/*
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* Perform unsynchronized reads on the object. In
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* this case, the lack of synchronization should not
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* impair the accuracy of the reported statistics.
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*/
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if ((object->flags & OBJ_FICTITIOUS) != 0) {
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/*
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* Devices, like /dev/mem, will badly skew our totals.
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*/
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continue;
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}
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if (object->ref_count == 0) {
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/*
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* Also skip unreferenced objects, including
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* vnodes representing mounted file systems.
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*/
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continue;
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}
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if (object->ref_count == 1 &&
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(object->flags & OBJ_NOSPLIT) != 0) {
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/*
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* Also skip otherwise unreferenced swap
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* objects backing tmpfs vnodes, and POSIX or
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* SysV shared memory.
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*/
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continue;
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}
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total.t_vm += object->size;
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total.t_rm += object->resident_page_count;
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if (is_object_active(object)) {
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total.t_avm += object->size;
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total.t_arm += object->resident_page_count;
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}
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if (object->shadow_count > 1) {
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/* shared object */
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total.t_vmshr += object->size;
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total.t_rmshr += object->resident_page_count;
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if (is_object_active(object)) {
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total.t_avmshr += object->size;
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total.t_armshr += object->resident_page_count;
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}
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}
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}
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mtx_unlock(&vm_object_list_mtx);
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total.t_free = vm_cnt.v_free_count;
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return (sysctl_handle_opaque(oidp, &total, sizeof(total), req));
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}
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/*
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* vm_meter_cnt() - accumulate statistics from all cpus and the global cnt
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* structure.
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*
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* The vmmeter structure is now per-cpu as well as global. Those
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* statistics which can be kept on a per-cpu basis (to avoid cache
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* stalls between cpus) can be moved to the per-cpu vmmeter. Remaining
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* statistics, such as v_free_reserved, are left in the global
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* structure.
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*/
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u_int
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vm_meter_cnt(size_t offset)
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{
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struct pcpu *pcpu;
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u_int count;
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int i;
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count = *(u_int *)((char *)&vm_cnt + offset);
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CPU_FOREACH(i) {
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pcpu = pcpu_find(i);
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count += *(u_int *)((char *)&pcpu->pc_cnt + offset);
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}
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return (count);
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}
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static int
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cnt_sysctl(SYSCTL_HANDLER_ARGS)
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{
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u_int count;
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count = vm_meter_cnt((char *)arg1 - (char *)&vm_cnt);
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return (SYSCTL_OUT(req, &count, sizeof(count)));
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}
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SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
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0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
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"System virtual memory statistics");
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SYSCTL_NODE(_vm, OID_AUTO, stats, CTLFLAG_RW, 0, "VM meter stats");
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static SYSCTL_NODE(_vm_stats, OID_AUTO, sys, CTLFLAG_RW, 0,
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"VM meter sys stats");
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static SYSCTL_NODE(_vm_stats, OID_AUTO, vm, CTLFLAG_RW, 0,
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"VM meter vm stats");
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SYSCTL_NODE(_vm_stats, OID_AUTO, misc, CTLFLAG_RW, 0, "VM meter misc stats");
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#define VM_STATS(parent, var, descr) \
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SYSCTL_PROC(parent, OID_AUTO, var, \
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CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, &vm_cnt.var, 0, \
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cnt_sysctl, "IU", descr)
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#define VM_STATS_VM(var, descr) VM_STATS(_vm_stats_vm, var, descr)
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#define VM_STATS_SYS(var, descr) VM_STATS(_vm_stats_sys, var, descr)
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VM_STATS_SYS(v_swtch, "Context switches");
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VM_STATS_SYS(v_trap, "Traps");
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VM_STATS_SYS(v_syscall, "System calls");
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VM_STATS_SYS(v_intr, "Device interrupts");
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VM_STATS_SYS(v_soft, "Software interrupts");
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VM_STATS_VM(v_vm_faults, "Address memory faults");
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VM_STATS_VM(v_io_faults, "Page faults requiring I/O");
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VM_STATS_VM(v_cow_faults, "Copy-on-write faults");
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VM_STATS_VM(v_cow_optim, "Optimized COW faults");
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VM_STATS_VM(v_zfod, "Pages zero-filled on demand");
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VM_STATS_VM(v_ozfod, "Optimized zero fill pages");
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VM_STATS_VM(v_swapin, "Swap pager pageins");
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VM_STATS_VM(v_swapout, "Swap pager pageouts");
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VM_STATS_VM(v_swappgsin, "Swap pages swapped in");
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VM_STATS_VM(v_swappgsout, "Swap pages swapped out");
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VM_STATS_VM(v_vnodein, "Vnode pager pageins");
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VM_STATS_VM(v_vnodeout, "Vnode pager pageouts");
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VM_STATS_VM(v_vnodepgsin, "Vnode pages paged in");
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VM_STATS_VM(v_vnodepgsout, "Vnode pages paged out");
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VM_STATS_VM(v_intrans, "In transit page faults");
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VM_STATS_VM(v_reactivated, "Pages reactivated by pagedaemon");
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VM_STATS_VM(v_pdwakeups, "Pagedaemon wakeups");
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VM_STATS_VM(v_pdpages, "Pages analyzed by pagedaemon");
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VM_STATS_VM(v_pdshortfalls, "Page reclamation shortfalls");
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VM_STATS_VM(v_dfree, "Pages freed by pagedaemon");
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VM_STATS_VM(v_pfree, "Pages freed by exiting processes");
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VM_STATS_VM(v_tfree, "Total pages freed");
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VM_STATS_VM(v_page_size, "Page size in bytes");
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VM_STATS_VM(v_page_count, "Total number of pages in system");
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VM_STATS_VM(v_free_reserved, "Pages reserved for deadlock");
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VM_STATS_VM(v_free_target, "Pages desired free");
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VM_STATS_VM(v_free_min, "Minimum low-free-pages threshold");
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VM_STATS_VM(v_free_count, "Free pages");
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VM_STATS_VM(v_wire_count, "Wired pages");
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VM_STATS_VM(v_active_count, "Active pages");
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VM_STATS_VM(v_inactive_target, "Desired inactive pages");
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VM_STATS_VM(v_inactive_count, "Inactive pages");
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VM_STATS_VM(v_laundry_count, "Pages eligible for laundering");
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VM_STATS_VM(v_pageout_free_min, "Min pages reserved for kernel");
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VM_STATS_VM(v_interrupt_free_min, "Reserved pages for interrupt code");
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VM_STATS_VM(v_forks, "Number of fork() calls");
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VM_STATS_VM(v_vforks, "Number of vfork() calls");
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VM_STATS_VM(v_rforks, "Number of rfork() calls");
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VM_STATS_VM(v_kthreads, "Number of fork() calls by kernel");
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VM_STATS_VM(v_forkpages, "VM pages affected by fork()");
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VM_STATS_VM(v_vforkpages, "VM pages affected by vfork()");
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VM_STATS_VM(v_rforkpages, "VM pages affected by rfork()");
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VM_STATS_VM(v_kthreadpages, "VM pages affected by fork() by kernel");
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#ifndef BURN_BRIDGES
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/*
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* Provide compatibility sysctls for the benefit of old utilities which exit
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* with an error if they cannot be found.
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*/
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SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_cache_count, CTLFLAG_RD,
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SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
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SYSCTL_UINT(_vm_stats_vm, OID_AUTO, v_tcached, CTLFLAG_RD,
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SYSCTL_NULL_UINT_PTR, 0, "Dummy for compatibility");
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#endif
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