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Date: Tue, 31 May 2011 16:14:38 +0900 From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: mel@....ul.ie CC: akpm@...ux-foundation.org, urykhy@...il.com, aarcange@...hat.com, linux-kernel@...r.kernel.org, linux-mm@...ck.org, stable@...nel.org Subject: Re: [PATCH] mm: compaction: Abort compaction if too many pages are isolated and caller is asynchronous (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@...il.com> > Signed-off-by: Mel Gorman <mgorman@...e.de> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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