Messages in this thread | | | Date | Tue, 31 May 2011 16:14:38 +0900 | From | KOSAKI Motohiro <> | Subject | Re: [PATCH] mm: compaction: Abort compaction if too many pages are isolated and caller is asynchronous |
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(2011/05/30 22:13), Mel Gorman wrote: > Asynchronous compaction is used when promoting to huge pages. This is > all very nice but if there are a number of processes in compacting > memory, a large number of pages can be isolated. An "asynchronous" > process can stall for long periods of time as a result with a user > reporting that firefox can stall for 10s of seconds. This patch aborts > asynchronous compaction if too many pages are isolated as it's better to > fail a hugepage promotion than stall a process. > > If accepted, this should also be considered for 2.6.39-stable. It should > also be considered for 2.6.38-stable but ideally [11bc82d6: mm: > compaction: Use async migration for __GFP_NO_KSWAPD and enforce no > writeback] would be applied to 2.6.38 before consideration. > > Reported-and-Tested-by: Ury Stankevich <urykhy@gmail.com> > Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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