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Add new (very useful) tunable for pageout daemon. The flag changes

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the maximum pageout rate:

sysctl -w vm.vm_maxlaunder=n

 1 < n < inf.

If paging heavily on large systems, it is likely that a performance
improvement can be achieved by increasing the parameter.  On a large
system, the parm is 32, but numbers as large as 128 can make a big
difference.  If paging is expensive, you might try decreasing the
number to 1-8.
This commit is contained in:
John Dyson 1997-12-05 05:41:06 +00:00
parent d4060a8751
commit 70111b9016
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=31550
1 changed files with 20 additions and 18 deletions
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38
sys/vm/vm_pageout.c
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@ -65,7 +65,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_pageout.c,v 1.100 1997/10/25 02:41:56 dyson Exp $
* $Id: vm_pageout.c,v 1.101 1997/12/04 19:00:56 dyson Exp $
*/
/*
@ -143,6 +143,8 @@ int vm_pageout_full_stats_interval = 0;
int vm_pageout_stats_free_max=0, vm_pageout_algorithm_lru=0;
int defer_swap_pageouts=0;
int disable_swap_pageouts=0;
int vm_maxlaunder=100;
#if defined(NO_SWAPPING)
int vm_swapping_enabled=0;
#else
@ -178,7 +180,9 @@ SYSCTL_INT(_vm, OID_AUTO, defer_swap_pageouts,
SYSCTL_INT(_vm, OID_AUTO, disable_swap_pageouts,
CTLFLAG_RW, &disable_swap_pageouts, 0, "");
#define MAXLAUNDER (cnt.v_page_count > 1800 ? 32 : 16)
SYSCTL_INT(_vm, OID_AUTO, vm_maxlaunder,
CTLFLAG_RW, &vm_maxlaunder, 0, "");
#define VM_PAGEOUT_PAGE_COUNT 16
int vm_pageout_page_count = VM_PAGEOUT_PAGE_COUNT;
@ -589,7 +593,8 @@ static int
vm_pageout_scan()
{
vm_page_t m, next;
int page_shortage, addl_page_shortage, maxscan, maxlaunder, pcount;
int page_shortage, addl_page_shortage, maxscan, pcount;
int maxlaunder;
int pages_freed;
struct proc *p, *bigproc;
vm_offset_t size, bigsize;
@ -614,8 +619,11 @@ vm_pageout_scan()
pages_freed = 0;
addl_page_shortage = 0;
maxlaunder = (cnt.v_inactive_target > MAXLAUNDER) ?
MAXLAUNDER : cnt.v_inactive_target;
if (vm_maxlaunder == 0)
vm_maxlaunder = 1;
maxlaunder = (cnt.v_inactive_target > vm_maxlaunder) ?
vm_maxlaunder : cnt.v_inactive_target;
rescan0:
maxscan = cnt.v_inactive_count;
for( m = TAILQ_FIRST(&vm_page_queue_inactive);
@ -729,18 +737,6 @@ vm_pageout_scan()
object = m->object;
/*
* We don't bother paging objects that are "dead". Those
* objects are in a "rundown" state.
*/
if (object->flags & OBJ_DEAD) {
s = splvm();
TAILQ_REMOVE(&vm_page_queue_inactive, m, pageq);
TAILQ_INSERT_TAIL(&vm_page_queue_inactive, m, pageq);
splx(s);
continue;
}
if ((object->type != OBJT_SWAP) && (object->type != OBJT_DEFAULT)) {
swap_pageouts_ok = 1;
} else {
@ -749,7 +745,12 @@ vm_pageout_scan()
(cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min);
}
if (!swap_pageouts_ok) {
/*
* We don't bother paging objects that are "dead". Those
* objects are in a "rundown" state.
*/
if (!swap_pageouts_ok || (object->flags & OBJ_DEAD)) {
s = splvm();
TAILQ_REMOVE(&vm_page_queue_inactive, m, pageq);
TAILQ_INSERT_TAIL(&vm_page_queue_inactive, m, pageq);
@ -1187,6 +1188,7 @@ vm_pageout()
if (vm_pageout_stats_free_max == 0)
vm_pageout_stats_free_max = 25;
vm_maxlaunder = (cnt.v_page_count > 1800 ? 32 : 16);
swap_pager_swap_init();
/*