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Prevent paging pressure from draining arc too much

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- always drain arc if above arc_c_max - never drain arc if arc is below arc_c_max

MFC after:	3 days
This commit is contained in:
Kip Macy 2009-10-06 21:40:50 +00:00
parent f681a5fdd4
commit e6b112e274
1 changed files with 6 additions and 3 deletions
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9
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -1821,6 +1821,12 @@ arc_reclaim_needed(void)
#endif
#ifdef _KERNEL
if (needfree)
return (1);
if (arc_size > arc_c_max)
return (1);
if (arc_size <= arc_c_min)
return (0);
/*
* If pages are needed or we're within 2048 pages
@ -1829,9 +1835,6 @@ arc_reclaim_needed(void)
if (vm_pages_needed || (vm_paging_target() > -2048))
return (1);
if (needfree)
return (1);
#if 0
/*
* take 'desfree' extra pages, so we reclaim sooner, rather than later