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Code Issues Releases Activity

zfs arc_reclaim_needed: more reasonable threshold for available pages

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vm_paging_target() is not a trigger of any kind for pageademon, but
rather a "soft" target for it when it's already triggered.
Thus, trying to keep 2048 pages above that level at the expense of ARC
was simply driving ARC size into the ground even with normal memory
loads.
Instead, use a threshold at which a pagedaemon scan is triggered, so
that ARC reclaiming helps with pagedaemon's task, but the latter still
recycles active and inactive pages.

PR:		kern/146410, kern/138790
MFC after:	3 weeks
This commit is contained in:
Andriy Gapon 2010-09-17 07:14:07 +00:00
parent 74f3a46a7d
commit 7c1353491f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=212780
1 changed files with 3 additions and 3 deletions
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6
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
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@ -2161,10 +2161,10 @@ arc_reclaim_needed(void)
return (0);
/*
* If pages are needed or we're within 2048 pages
* of needing to page need to reclaim
* Cooperate with pagedaemon when it's time for it to scan
* and reclaim some pages.
*/
if (vm_pages_needed || (vm_paging_target() > -2048))
if (vm_paging_need())
return (1);
#if 0