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- Increase the active lru refresh interval to 10 minutes. This has been

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shown to negatively impact some workloads and the goal is only to
   eliminate worst case behaviors for very long periods of paging
   inactivity.  Eventually we should determine a more complex scaling
   factor for this feature.
 - Rate limit low memory callback handlers to limit thrashing.  Set the
   default to 10 seconds.

Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
jeff 2013-08-19 23:54:24 +00:00
parent ed90d4ba3f
commit 0b78e7c4d9
1 changed files with 12 additions and 4 deletions
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16
sys/vm/vm_pageout.c
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@ -159,6 +159,8 @@ static int vm_max_launder = 32;
static int vm_pageout_update_period;
static int defer_swap_pageouts;
static int disable_swap_pageouts;
static int lowmem_period = 10;
static int lowmem_ticks;
#if defined(NO_SWAPPING)
static int vm_swap_enabled = 0;
@ -179,6 +181,9 @@ SYSCTL_INT(_vm, OID_AUTO, pageout_update_period,
CTLFLAG_RW, &vm_pageout_update_period, 0,
"Maximum active LRU update period");
SYSCTL_INT(_vm, OID_AUTO, lowmem_period, CTLFLAG_RW, &lowmem_period, 0,
"Low memory callback period");
#if defined(NO_SWAPPING)
SYSCTL_INT(_vm, VM_SWAPPING_ENABLED, swap_enabled,
CTLFLAG_RD, &vm_swap_enabled, 0, "Enable entire process swapout");
@ -901,9 +906,10 @@ vm_pageout_scan(struct vm_domain *vmd, int pass)
/*
* If we need to reclaim memory ask kernel caches to return
* some.
* some. We rate limit to avoid thrashing.
*/
if (pass > 0) {
if (vmd == &vm_dom[0] && pass > 0 &&
lowmem_ticks + (lowmem_period * hz) < ticks) {
/*
* Decrease registered cache sizes.
*/
@ -913,6 +919,7 @@ vm_pageout_scan(struct vm_domain *vmd, int pass)
* drained above.
*/
uma_reclaim();
lowmem_ticks = ticks;
}
/*
@ -1680,10 +1687,11 @@ vm_pageout(void)
/*
* Set interval in seconds for active scan. We want to visit each
* page at least once a minute.
* page at least once every ten minutes. This is to prevent worst
* case paging behaviors with stale active LRU.
*/
if (vm_pageout_update_period == 0)
vm_pageout_update_period = 60;
vm_pageout_update_period = 600;
/* XXX does not really belong here */
if (vm_page_max_wired == 0)