Re: [PATCH 4/4] mm: compaction: Abort compaction if too many pagesare isolated and caller is asynchronous V2

From: Minchan Kim
Date: Tue Jun 07 2011 - 12:37:13 EST

On Tue, Jun 07, 2011 at 05:27:11PM +0100, Mel Gorman wrote:
> Changelog since V1
> o Return COMPACT_PARTIAL when aborting due to too many isolated
> pages. As pointed out by Minchan, this is better for consistency
> 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.
> [ Return COMPACT_PARTIAL for abort]
> Reported-and-tested-by: Ury Stankevich <urykhy@xxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
Reviewed-by: Minchan Kim <>

Kind regards
Minchan Kim
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