This commit does a couple of things:
Re-enables the RSS limiting, and the routine is now tail-recursive, making it much more safe (eliminates the possiblity of kernel stack overflow.) Also, the RSS limiting is a little more intelligent about finding the likely objects that are pushing the process over the limit. Added some sysctls that help with VM system tuning. New sysctl features: 1) Enable/disable lru pageout algorithm. vm.pageout_algorithm = 0, default algorithm that works well, especially using X windows and heavy memory loading. Can have adverse effects, sometimes slowing down program loading. vm.pageout_algorithm = 1, close to true LRU. Works much better than clock, etc. Does not work as well as the default algorithm in general. Certain memory "malloc" type benchmarks work a little better with this setting. Please give me feedback on the performance results associated with these. 2) Enable/disable swapping. vm.swapping_enabled = 1, default. vm.swapping_enabled = 0, useful for cases where swapping degrades performance. The config option "NO_SWAPPING" is still operative, and takes precedence over the sysctl. If "NO_SWAPPING" is specified, the sysctl still exists, but "vm.swapping_enabled" is hard-wired to "0". Each of these can be changed "on the fly."
This commit is contained in:
John Dyson
parent
d04d75dd99
commit
38efa82b23
@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
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* $Id: vm_page.c,v 1.58 1996/06/17 03:35:37 dyson Exp $
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* $Id: vm_page.c,v 1.59 1996/06/21 05:39:22 dyson Exp $
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*/
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/*
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@ -693,6 +693,7 @@ vm_page_alloc(object, pindex, page_req)
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}
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m->wire_count = 0;
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m->hold_count = 0;
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m->act_count = 0;
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m->busy = 0;
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m->valid = 0;
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m->dirty = 0;
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@ -740,6 +741,8 @@ vm_page_activate(m)
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if (m->wire_count == 0) {
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TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
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m->queue = PQ_ACTIVE;
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if (m->act_count < ACT_INIT)
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m->act_count = ACT_INIT;
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cnt.v_active_count++;
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}
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splx(s);
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@ -61,7 +61,7 @@
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_page.h,v 1.27 1996/06/05 03:31:49 dyson Exp $
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* $Id: vm_page.h,v 1.28 1996/06/08 06:48:35 dyson Exp $
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*/
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/*
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@ -147,7 +147,8 @@ struct vm_page {
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#define ACT_DECLINE 1
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#define ACT_ADVANCE 3
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#define ACT_MAX 100
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#define ACT_INIT 5
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#define ACT_MAX 32
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#define PFCLUSTER_BEHIND 3
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#define PFCLUSTER_AHEAD 3
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@ -65,7 +65,7 @@
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_pageout.c,v 1.77 1996/06/17 03:35:40 dyson Exp $
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* $Id: vm_pageout.c,v 1.78 1996/06/24 04:30:24 dyson Exp $
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*/
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/*
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@ -82,6 +82,7 @@
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <sys/vmmeter.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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@ -114,7 +115,7 @@ static struct kproc_desc page_kp = {
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};
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SYSINIT_KT(pagedaemon, SI_SUB_KTHREAD_PAGE, SI_ORDER_FIRST, kproc_start, &page_kp)
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#ifndef NO_SWAPPING
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#if !defined(NO_SWAPPING)
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/* the kernel process "vm_daemon"*/
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static void vm_daemon __P((void));
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static struct proc *vmproc;
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@ -125,7 +126,7 @@ static struct kproc_desc vm_kp = {
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&vmproc
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};
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SYSINIT_KT(vmdaemon, SI_SUB_KTHREAD_VM, SI_ORDER_FIRST, kproc_start, &vm_kp)
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#endif /* !NO_SWAPPING */
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#endif
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int vm_pages_needed; /* Event on which pageout daemon sleeps */
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@ -133,11 +134,30 @@ int vm_pages_needed; /* Event on which pageout daemon sleeps */
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int vm_pageout_pages_needed; /* flag saying that the pageout daemon needs pages */
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extern int npendingio;
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#if !defined(NO_SWAPPING)
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static int vm_pageout_req_swapout; /* XXX */
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static int vm_daemon_needed;
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#endif
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extern int nswiodone;
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extern int vm_swap_size;
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extern int vfs_update_wakeup;
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int vm_pageout_algorithm_lru=0;
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#if defined(NO_SWAPPING)
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int vm_swapping_enabled=0;
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#else
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int vm_swapping_enabled=1;
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#endif
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SYSCTL_INT(_vm, VM_PAGEOUT_ALGORITHM, pageout_algorithm,
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CTLFLAG_RW, &vm_pageout_algorithm_lru, 0, "");
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#if defined(NO_SWAPPING)
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SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swapping_enabled,
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CTLFLAG_RD, &vm_swapping_enabled, 0, "");
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#else
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SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swapping_enabled,
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CTLFLAG_RW, &vm_swapping_enabled, 0, "");
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#endif
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#define MAXLAUNDER (cnt.v_page_count > 1800 ? 32 : 16)
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@ -146,11 +166,12 @@ int vm_pageout_page_count = VM_PAGEOUT_PAGE_COUNT;
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int vm_page_max_wired; /* XXX max # of wired pages system-wide */
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typedef int freeer_fcn_t __P((vm_map_t, vm_object_t, int, int));
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static void vm_pageout_map_deactivate_pages __P((vm_map_t, vm_map_entry_t,
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int *, freeer_fcn_t *));
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#if !defined(NO_SWAPPING)
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typedef void freeer_fcn_t __P((vm_map_t, vm_object_t, vm_pindex_t, int));
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static void vm_pageout_map_deactivate_pages __P((vm_map_t, vm_pindex_t));
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static freeer_fcn_t vm_pageout_object_deactivate_pages;
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static void vm_req_vmdaemon __P((void));
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#endif
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/*
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* vm_pageout_clean:
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@ -370,6 +391,7 @@ vm_pageout_flush(mc, count, sync)
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return anyok;
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}
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#if !defined(NO_SWAPPING)
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/*
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* vm_pageout_object_deactivate_pages
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*
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@ -380,140 +402,160 @@ vm_pageout_flush(mc, count, sync)
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*
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* The object and map must be locked.
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*/
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static int
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vm_pageout_object_deactivate_pages(map, object, count, map_remove_only)
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static void
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vm_pageout_object_deactivate_pages(map, object, desired, map_remove_only)
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vm_map_t map;
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vm_object_t object;
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int count;
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vm_pindex_t desired;
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int map_remove_only;
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{
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register vm_page_t p, next;
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int rcount;
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int dcount;
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int remove_mode;
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int s;
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dcount = 0;
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if (count == 0)
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count = 1;
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if (object->type == OBJT_DEVICE)
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return 0;
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return;
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if (object->backing_object) {
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if (object->backing_object->ref_count == 1)
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dcount += vm_pageout_object_deactivate_pages(map,
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object->backing_object, count / 2 + 1, map_remove_only);
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else
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vm_pageout_object_deactivate_pages(map,
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object->backing_object, count, 1);
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}
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if (object->paging_in_progress)
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return dcount;
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while (object) {
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if (vm_map_pmap(map)->pm_stats.resident_count <= desired)
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return;
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if (object->paging_in_progress)
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return;
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remove_mode = map_remove_only;
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if (object->shadow_count > 1)
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remove_mode = 1;
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/*
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* scan the objects entire memory queue
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*/
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rcount = object->resident_page_count;
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p = TAILQ_FIRST(&object->memq);
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while (p && (rcount-- > 0)) {
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int refcount;
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next = TAILQ_NEXT(p, listq);
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cnt.v_pdpages++;
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if (p->wire_count != 0 ||
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p->hold_count != 0 ||
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p->busy != 0 ||
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(p->flags & PG_BUSY) ||
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!pmap_page_exists(vm_map_pmap(map), VM_PAGE_TO_PHYS(p))) {
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p = next;
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continue;
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}
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refcount = 0;
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if ((p->flags & PG_REFERENCED) == 0) {
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refcount = pmap_ts_referenced(VM_PAGE_TO_PHYS(p));
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if (refcount) {
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p->flags |= PG_REFERENCED;
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rcount = object->resident_page_count;
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p = TAILQ_FIRST(&object->memq);
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while (p && (rcount-- > 0)) {
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int refcount;
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if (vm_map_pmap(map)->pm_stats.resident_count <= desired)
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return;
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next = TAILQ_NEXT(p, listq);
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cnt.v_pdpages++;
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if (p->wire_count != 0 ||
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p->hold_count != 0 ||
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p->busy != 0 ||
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(p->flags & PG_BUSY) ||
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!pmap_page_exists(vm_map_pmap(map), VM_PAGE_TO_PHYS(p))) {
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p = next;
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continue;
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}
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} else {
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pmap_clear_reference(VM_PAGE_TO_PHYS(p));
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}
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if ((p->queue != PQ_ACTIVE) && (p->flags & PG_REFERENCED)) {
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vm_page_activate(p);
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}
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/*
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* if a page is active, not wired and is in the processes
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* pmap, then deactivate the page.
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*/
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if (p->queue == PQ_ACTIVE) {
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if ((p->flags & PG_REFERENCED) == 0) {
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vm_page_protect(p, VM_PROT_NONE);
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if (!map_remove_only)
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vm_page_deactivate(p);
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/*
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* see if we are done yet
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*/
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if (p->queue == PQ_INACTIVE) {
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--count;
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++dcount;
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if (count <= 0 &&
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cnt.v_inactive_count > cnt.v_inactive_target) {
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return dcount;
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}
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refcount = pmap_ts_referenced(VM_PAGE_TO_PHYS(p));
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if (refcount) {
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p->act_count += refcount - 1;
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p->flags |= PG_REFERENCED;
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}
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} else {
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p->flags &= ~PG_REFERENCED;
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s = splvm();
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TAILQ_REMOVE(&vm_page_queue_active, p, pageq);
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TAILQ_INSERT_TAIL(&vm_page_queue_active, p, pageq);
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splx(s);
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pmap_clear_reference(VM_PAGE_TO_PHYS(p));
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}
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} else if (p->queue == PQ_INACTIVE) {
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vm_page_protect(p, VM_PROT_NONE);
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if ((p->queue != PQ_ACTIVE) &&
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(p->flags & PG_REFERENCED)) {
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vm_page_activate(p);
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}
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/*
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* if a page is active, not wired and is in the processes
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* pmap, then deactivate the page.
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*/
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if (p->queue == PQ_ACTIVE) {
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if ((p->flags & PG_REFERENCED) == 0) {
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vm_page_protect(p, VM_PROT_NONE);
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if (!remove_mode)
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vm_page_deactivate(p);
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} else {
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p->flags &= ~PG_REFERENCED;
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if (p->act_count < (ACT_MAX - ACT_ADVANCE))
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p->act_count += ACT_ADVANCE;
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s = splvm();
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TAILQ_REMOVE(&vm_page_queue_active, p, pageq);
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TAILQ_INSERT_TAIL(&vm_page_queue_active, p, pageq);
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splx(s);
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}
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} else if (p->queue == PQ_INACTIVE) {
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vm_page_protect(p, VM_PROT_NONE);
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}
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p = next;
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}
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p = next;
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object = object->backing_object;
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}
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return dcount;
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return;
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}
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/*
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* deactivate some number of pages in a map, try to do it fairly, but
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* that is really hard to do.
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*/
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static void
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vm_pageout_map_deactivate_pages(map, entry, count, freeer)
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vm_pageout_map_deactivate_pages(map, desired)
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vm_map_t map;
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vm_map_entry_t entry;
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int *count;
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freeer_fcn_t *freeer;
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vm_pindex_t desired;
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{
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vm_map_t tmpm;
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vm_map_entry_t tmpe;
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vm_object_t obj;
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vm_object_t obj, bigobj;
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if (*count <= 0)
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return;
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vm_map_reference(map);
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if (!lock_try_read(&map->lock)) {
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if (!lock_try_write(&map->lock)) {
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vm_map_deallocate(map);
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return;
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}
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if (entry == 0) {
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tmpe = map->header.next;
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while (tmpe != &map->header && *count > 0) {
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vm_pageout_map_deactivate_pages(map, tmpe, count, freeer);
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tmpe = tmpe->next;
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};
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} else if (entry->is_sub_map == 0 && entry->is_a_map == 0 &&
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(obj = entry->object.vm_object) != 0) {
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*count -= (*freeer) (map, obj, *count, TRUE);
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bigobj = NULL;
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/*
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* first, search out the biggest object, and try to free pages from
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* that.
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*/
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tmpe = map->header.next;
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while (tmpe != &map->header) {
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if ((tmpe->is_sub_map == 0) && (tmpe->is_a_map == 0)) {
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obj = tmpe->object.vm_object;
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if ((obj != NULL) && (obj->shadow_count <= 1) &&
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((bigobj == NULL) ||
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(bigobj->resident_page_count < obj->resident_page_count))) {
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bigobj = obj;
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}
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}
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tmpe = tmpe->next;
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}
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lock_read_done(&map->lock);
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if (bigobj)
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vm_pageout_object_deactivate_pages(map, bigobj, desired, 0);
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/*
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* Next, hunt around for other pages to deactivate. We actually
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* do this search sort of wrong -- .text first is not the best idea.
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*/
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tmpe = map->header.next;
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while (tmpe != &map->header) {
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if (vm_map_pmap(map)->pm_stats.resident_count <= desired)
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break;
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if ((tmpe->is_sub_map == 0) && (tmpe->is_a_map == 0)) {
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obj = tmpe->object.vm_object;
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vm_pageout_object_deactivate_pages(map, obj, desired, 0);
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}
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tmpe = tmpe->next;
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};
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|
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/*
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* Remove all mappings if a process is swapped out, this will free page
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* table pages.
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*/
|
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if (desired == 0)
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pmap_remove(vm_map_pmap(map),
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VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS);
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vm_map_unlock(map);
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vm_map_deallocate(map);
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return;
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}
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#endif
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|
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/*
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* vm_pageout_scan does the dirty work for the pageout daemon.
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@ -531,8 +573,6 @@ vm_pageout_scan()
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int vnodes_skipped = 0;
|
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int s;
|
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|
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|
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|
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/*
|
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* Start scanning the inactive queue for pages we can free. We keep
|
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* scanning until we have enough free pages or we have scanned through
|
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@ -713,24 +753,13 @@ vm_pageout_scan()
|
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}
|
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|
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|
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rescan1:
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pcount = cnt.v_active_count;
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m = TAILQ_FIRST(&vm_page_queue_active);
|
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while ((m != NULL) && (pcount-- > 0) && (page_shortage > 0)) {
|
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int refcount;
|
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|
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if (m->queue != PQ_ACTIVE) {
|
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#if defined(DIAGNOSTIC)
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printf("vm_pageout_scan: page not on active queue: %d, pindex: 0x%x, flags: 0x%x, ",
|
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m->queue, m->pindex, m->flags);
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if (m->object == kmem_object)
|
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printf("kmem object\n");
|
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else if (m->object == kernel_object)
|
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printf("kernel object\n");
|
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else
|
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printf("object type: %d\n", m->object->type);
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#endif
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goto rescan1;
|
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break;
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}
|
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|
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next = TAILQ_NEXT(m, pageq);
|
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@ -761,24 +790,37 @@ vm_pageout_scan()
|
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refcount += 1;
|
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}
|
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refcount += pmap_ts_referenced(VM_PAGE_TO_PHYS(m));
|
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if (refcount) {
|
||||
m->act_count += ACT_ADVANCE + refcount;
|
||||
if (m->act_count > ACT_MAX)
|
||||
m->act_count = ACT_MAX;
|
||||
}
|
||||
}
|
||||
|
||||
m->flags &= ~PG_REFERENCED;
|
||||
|
||||
if (refcount && m->object->ref_count != 0) {
|
||||
if (refcount && (m->object->ref_count != 0)) {
|
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s = splvm();
|
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TAILQ_REMOVE(&vm_page_queue_active, m, pageq);
|
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TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
|
||||
splx(s);
|
||||
} else {
|
||||
--page_shortage;
|
||||
vm_page_protect(m, VM_PROT_NONE);
|
||||
if (m->dirty == 0)
|
||||
vm_page_test_dirty(m);
|
||||
if ((m->object->ref_count == 0) && (m->dirty == 0)) {
|
||||
vm_page_cache(m);
|
||||
m->act_count -= min(m->act_count, ACT_DECLINE);
|
||||
if (vm_pageout_algorithm_lru ||
|
||||
(m->object->ref_count == 0) || (m->act_count == 0)) {
|
||||
--page_shortage;
|
||||
vm_page_protect(m, VM_PROT_NONE);
|
||||
if ((m->dirty == 0) &&
|
||||
(m->object->ref_count == 0)) {
|
||||
vm_page_cache(m);
|
||||
} else {
|
||||
vm_page_deactivate(m);
|
||||
}
|
||||
} else {
|
||||
vm_page_deactivate(m);
|
||||
s = splvm();
|
||||
TAILQ_REMOVE(&vm_page_queue_active, m, pageq);
|
||||
TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
|
||||
splx(s);
|
||||
}
|
||||
}
|
||||
m = next;
|
||||
@ -812,8 +854,9 @@ vm_pageout_scan()
|
||||
wakeup(&vfs_update_wakeup);
|
||||
}
|
||||
}
|
||||
#ifndef NO_SWAPPING
|
||||
if (cnt.v_free_count + cnt.v_cache_count < cnt.v_free_target) {
|
||||
#if !defined(NO_SWAPPING)
|
||||
if (vm_swapping_enabled &&
|
||||
(cnt.v_free_count + cnt.v_cache_count < cnt.v_free_target)) {
|
||||
vm_req_vmdaemon();
|
||||
vm_pageout_req_swapout = 1;
|
||||
}
|
||||
@ -951,7 +994,7 @@ vm_pageout()
|
||||
vm_pages_needed = 0;
|
||||
tsleep(&vm_pages_needed, PVM, "psleep", 0);
|
||||
} else if (!vm_pages_needed) {
|
||||
tsleep(&vm_pages_needed, PVM, "psleep", hz/3);
|
||||
tsleep(&vm_pages_needed, PVM, "psleep", hz/10);
|
||||
}
|
||||
inactive_target =
|
||||
(cnt.v_page_count - cnt.v_wire_count) / 4;
|
||||
@ -969,7 +1012,7 @@ vm_pageout()
|
||||
}
|
||||
}
|
||||
|
||||
#ifndef NO_SWAPPING
|
||||
#if !defined(NO_SWAPPING)
|
||||
static void
|
||||
vm_req_vmdaemon()
|
||||
{
|
||||
@ -1000,9 +1043,7 @@ vm_daemon()
|
||||
* process is swapped out -- deactivate pages
|
||||
*/
|
||||
|
||||
#if !defined(RSS_LIMIT)
|
||||
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
|
||||
int overage;
|
||||
quad_t limit;
|
||||
vm_offset_t size;
|
||||
|
||||
@ -1036,12 +1077,10 @@ vm_daemon()
|
||||
|
||||
size = p->p_vmspace->vm_pmap.pm_stats.resident_count * PAGE_SIZE;
|
||||
if (limit >= 0 && size >= limit) {
|
||||
overage = (size - limit) >> PAGE_SHIFT;
|
||||
vm_pageout_map_deactivate_pages(&p->p_vmspace->vm_map,
|
||||
(vm_map_entry_t) 0, &overage, vm_pageout_object_deactivate_pages);
|
||||
(vm_pindex_t)(limit >> PAGE_SHIFT) );
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* we remove cached objects that have no RSS...
|
||||
@ -1061,4 +1100,4 @@ vm_daemon()
|
||||
}
|
||||
}
|
||||
}
|
||||
#endif /* !NO_SWAPPING */
|
||||
#endif
|
||||
|
||||
@ -61,7 +61,7 @@
|
||||
* any improvements or extensions that they make and grant Carnegie the
|
||||
* rights to redistribute these changes.
|
||||
*
|
||||
* $Id: vm_param.h,v 1.4 1995/01/09 16:05:57 davidg Exp $
|
||||
* $Id: vm_param.h,v 1.5 1995/12/10 02:34:29 bde Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -116,7 +116,9 @@ extern int page_shift;
|
||||
#define VM_V_CACHE_MIN 7 /* cnt.v_cache_max */
|
||||
#define VM_V_CACHE_MAX 8 /* cnt.v_cache_min */
|
||||
#define VM_V_PAGEOUT_FREE_MIN 9 /* cnt.v_pageout_free_min */
|
||||
#define VM_MAXID 10 /* number of valid vm ids */
|
||||
#define VM_PAGEOUT_ALGORITHM 10 /* pageout algorithm */
|
||||
#define VM_SWAPPING_ENABLED 11 /* swapping enabled */
|
||||
#define VM_MAXID 12 /* number of valid vm ids */
|
||||
|
||||
#define CTL_VM_NAMES { \
|
||||
{ 0, 0 }, \
|
||||
@ -129,6 +131,8 @@ extern int page_shift;
|
||||
{ "v_cache_min", CTLTYPE_INT }, \
|
||||
{ "v_cache_max", CTLTYPE_INT }, \
|
||||
{ "v_pageout_free_min", CTLTYPE_INT}, \
|
||||
{ "pageout_algorithm", CTLTYPE_INT}, \
|
||||
{ "swapping_enabled", CTLTYPE_INT},\
|
||||
}
|
||||
|
||||
/*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user