| Date | Thu, 28 Apr 2011 11:31:26 +0100 | From | Mel Gorman <> | Subject | Re: [RFC 2/8] compaction: make isolate_lru_page with filter aware |
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On Wed, Apr 27, 2011 at 01:25:19AM +0900, Minchan Kim wrote: > In async mode, compaction doesn't migrate dirty or writeback pages. > So, it's meaningless to pick the page and re-add it to lru list. > > Of course, when we isolate the page in compaction, the page might > be dirty or writeback but when we try to migrate the page, the page > would be not dirty, writeback. So it could be migrated. But it's > very unlikely as isolate and migration cycle is much faster than > writeout. > > So, this patch helps cpu and prevent unnecessary LRU churning. > > Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> > Cc: Mel Gorman <mgorman@suse.de> > Cc: Rik van Riel <riel@redhat.com> > Cc: Andrea Arcangeli <aarcange@redhat.com> > Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Mel Gorman <mgorman@suse.de>
-- Mel Gorman SUSE Labs
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