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06d6e4fcfe
freebsd/sys/vm/vm_meter.c
Alan Cox e0ba75dd78 Avoid lock-order reversal between the vm object list mutex and the vm 
object mutex.
2004-01-02 19:38:25 +00:00

369 lines
14 KiB
C
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/*
* 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 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
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/sx.h>
#include <sys/vmmeter.h>
#include <sys/smp.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_extern.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <sys/sysctl.h>
struct vmmeter cnt;
int maxslp = MAXSLP;
SYSCTL_UINT(_vm, VM_V_FREE_MIN, v_free_min,
CTLFLAG_RW, &cnt.v_free_min, 0, "");
SYSCTL_UINT(_vm, VM_V_FREE_TARGET, v_free_target,
CTLFLAG_RW, &cnt.v_free_target, 0, "");
SYSCTL_UINT(_vm, VM_V_FREE_RESERVED, v_free_reserved,
CTLFLAG_RW, &cnt.v_free_reserved, 0, "");
SYSCTL_UINT(_vm, VM_V_INACTIVE_TARGET, v_inactive_target,
CTLFLAG_RW, &cnt.v_inactive_target, 0, "");
SYSCTL_UINT(_vm, VM_V_CACHE_MIN, v_cache_min,
CTLFLAG_RW, &cnt.v_cache_min, 0, "");
SYSCTL_UINT(_vm, VM_V_CACHE_MAX, v_cache_max,
CTLFLAG_RW, &cnt.v_cache_max, 0, "");
SYSCTL_UINT(_vm, VM_V_PAGEOUT_FREE_MIN, v_pageout_free_min,
CTLFLAG_RW, &cnt.v_pageout_free_min, 0, "");
SYSCTL_UINT(_vm, OID_AUTO, v_free_severe,
CTLFLAG_RW, &cnt.v_free_severe, 0, "");
SYSCTL_STRUCT(_vm, VM_LOADAVG, loadavg, CTLFLAG_RD,
&averunnable, loadavg, "Machine loadaverage history");
static int
vmtotal(SYSCTL_HANDLER_ARGS)
{
/* XXXKSE almost completely broken */
struct proc *p;
struct vmtotal total, *totalp;
vm_map_entry_t entry;
vm_object_t object;
vm_map_t map;
int paging;
struct thread *td;
totalp = &total;
bzero(totalp, sizeof *totalp);
/*
* Mark all objects as inactive.
*/
GIANT_REQUIRED;
mtx_lock(&vm_object_list_mtx);
TAILQ_FOREACH(object, &vm_object_list, object_list) {
if (!VM_OBJECT_TRYLOCK(object)) {
/*
* Avoid a lock-order reversal. Consequently,
* the reported number of active pages may be
* greater than the actual number.
*/
continue;
}
vm_object_clear_flag(object, OBJ_ACTIVE);
VM_OBJECT_UNLOCK(object);
}
mtx_unlock(&vm_object_list_mtx);
/*
* Calculate process statistics.
*/
sx_slock(&allproc_lock);
FOREACH_PROC_IN_SYSTEM(p) {
if (p->p_flag & P_SYSTEM)
continue;
mtx_lock_spin(&sched_lock);
switch (p->p_state) {
case PRS_NEW:
mtx_unlock_spin(&sched_lock);
continue;
break;
default:
FOREACH_THREAD_IN_PROC(p, td) {
/* Need new statistics XXX */
switch (td->td_state) {
case TDS_INHIBITED:
if (TD_ON_LOCK(td) ||
(td->td_inhibitors ==
TDI_SWAPPED)) {
totalp->t_sw++;
} else if (TD_IS_SLEEPING(td) ||
TD_AWAITING_INTR(td) ||
TD_IS_SUSPENDED(td)) {
if (td->td_priority <= PZERO)
totalp->t_dw++;
else
totalp->t_sl++;
}
break;
case TDS_CAN_RUN:
totalp->t_sw++;
break;
case TDS_RUNQ:
case TDS_RUNNING:
totalp->t_rq++;
continue;
default:
break;
}
}
}
mtx_unlock_spin(&sched_lock);
/*
* Note active objects.
*/
paging = 0;
map = &p->p_vmspace->vm_map;
vm_map_lock_read(map);
for (entry = map->header.next;
entry != &map->header; entry = entry->next) {
if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) ||
(object = entry->object.vm_object) == NULL)
continue;
VM_OBJECT_LOCK(object);
vm_object_set_flag(object, OBJ_ACTIVE);
paging |= object->paging_in_progress;
VM_OBJECT_UNLOCK(object);
}
vm_map_unlock_read(map);
if (paging)
totalp->t_pw++;
}
sx_sunlock(&allproc_lock);
/*
* Calculate object memory usage statistics.
*/
mtx_lock(&vm_object_list_mtx);
TAILQ_FOREACH(object, &vm_object_list, object_list) {
/*
* Perform unsynchronized reads on the object to avoid
* a lock-order reversal. In this case, the lack of
* synchronization should not impair the accuracy of
* the reported statistics.
*/
if (object->type == OBJT_DEVICE) {
/*
* Devices, like /dev/mem, will badly skew our totals.
*/
continue;
}
totalp->t_vm += object->size;
totalp->t_rm += object->resident_page_count;
if (object->flags & OBJ_ACTIVE) {
totalp->t_avm += object->size;
totalp->t_arm += object->resident_page_count;
}
if (object->shadow_count > 1) {
/* shared object */
totalp->t_vmshr += object->size;
totalp->t_rmshr += object->resident_page_count;
if (object->flags & OBJ_ACTIVE) {
totalp->t_avmshr += object->size;
totalp->t_armshr += object->resident_page_count;
}
}
}
mtx_unlock(&vm_object_list_mtx);
totalp->t_free = cnt.v_free_count + cnt.v_cache_count;
return (sysctl_handle_opaque(oidp, totalp, sizeof total, req));
}
/*
* vcnt() - accumulate statistics from all cpus and the global cnt
* structure.
*
* 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)
*/
static int
vcnt(SYSCTL_HANDLER_ARGS)
{
int error = 0;
int count = *(int *)arg1;
#ifdef SMP
int i;
int offset = (char *)arg1 - (char *)&cnt;
for (i = 0; i < mp_ncpus; ++i) {
struct pcpu *pcpu = pcpu_find(i);
count += *(int *)((char *)&pcpu->pc_cnt + offset);
}
#else
int offset = (char *)arg1 - (char *)&cnt;
count += *(int *)((char *)PCPU_PTR(cnt) + offset);
#endif
error = SYSCTL_OUT(req, &count, sizeof(int));
return(error);
}
SYSCTL_PROC(_vm, VM_TOTAL, vmtotal, CTLTYPE_OPAQUE|CTLFLAG_RD,
0, sizeof(struct vmtotal), vmtotal, "S,vmtotal",
"System virtual memory 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,
&cnt.v_swtch, 0, vcnt, "IU", "Context switches");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_trap, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_trap, 0, vcnt, "IU", "Traps");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_syscall, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_syscall, 0, vcnt, "IU", "Syscalls");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_intr, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_intr, 0, vcnt, "IU", "Hardware interrupts");
SYSCTL_PROC(_vm_stats_sys, OID_AUTO, v_soft, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_soft, 0, vcnt, "IU", "Software interrupts");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vm_faults, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vm_faults, 0, vcnt, "IU", "VM faults");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_faults, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_cow_faults, 0, vcnt, "IU", "COW faults");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cow_optim, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_cow_optim, 0, vcnt, "IU", "Optimized COW faults");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_zfod, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_zfod, 0, vcnt, "IU", "Zero fill");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_ozfod, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_ozfod, 0, vcnt, "IU", "Optimized zero fill");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapin, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_swapin, 0, vcnt, "IU", "Swapin operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swapout, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_swapout, 0, vcnt, "IU", "Swapout operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsin, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_swappgsin, 0, vcnt, "IU", "Swapin pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_swappgsout, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_swappgsout, 0, vcnt, "IU", "Swapout pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodein, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vnodein, 0, vcnt, "IU", "Vnodein operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodeout, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vnodeout, 0, vcnt, "IU", "Vnodeout operations");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsin, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vnodepgsin, 0, vcnt, "IU", "Vnodein pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vnodepgsout, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vnodepgsout, 0, vcnt, "IU", "Vnodeout pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_intrans, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_intrans, 0, vcnt, "IU", "In transit page blocking");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_reactivated, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_reactivated, 0, vcnt, "IU", "Reactivated pages");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdwakeups, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_pdwakeups, 0, vcnt, "IU", "Pagedaemon wakeups");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pdpages, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_pdpages, 0, vcnt, "IU", "Pagedaemon page scans");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_dfree, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_dfree, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pfree, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_pfree, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_tfree, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_tfree, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_size, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_page_size, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_page_count, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_page_count, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_reserved, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_free_reserved, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_target, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_free_target, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_min, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_free_min, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_free_count, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_free_count, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_wire_count, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_wire_count, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_active_count, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_active_count, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_target, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_inactive_target, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_inactive_count, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_inactive_count, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_count, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_cache_count, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_min, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_cache_min, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_cache_max, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_cache_max, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_pageout_free_min, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_pageout_free_min, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_interrupt_free_min, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_interrupt_free_min, 0, vcnt, "IU", "");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forks, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_forks, 0, vcnt, "IU", "Number of fork() calls");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforks, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vforks, 0, vcnt, "IU", "Number of vfork() calls");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforks, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_rforks, 0, vcnt, "IU", "Number of rfork() calls");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreads, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_kthreads, 0, vcnt, "IU", "Number of fork() calls by kernel");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_forkpages, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_forkpages, 0, vcnt, "IU", "VM pages affected by fork()");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_vforkpages, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_vforkpages, 0, vcnt, "IU", "VM pages affected by vfork()");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_rforkpages, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_rforkpages, 0, vcnt, "IU", "VM pages affected by rfork()");
SYSCTL_PROC(_vm_stats_vm, OID_AUTO, v_kthreadpages, CTLTYPE_UINT|CTLFLAG_RD,
&cnt.v_kthreadpages, 0, vcnt, "IU", "VM pages affected by fork() by kernel");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
zero_page_count, CTLFLAG_RD, &vm_page_zero_count, 0, "");
#if 0
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
page_mask, CTLFLAG_RD, &page_mask, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
page_shift, CTLFLAG_RD, &page_shift, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
first_page, CTLFLAG_RD, &first_page, 0, "");
SYSCTL_INT(_vm_stats_misc, OID_AUTO,
last_page, CTLFLAG_RD, &last_page, 0, "");
#endif
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