Messages in this thread | | | Date | Wed, 23 Nov 2011 02:50:55 +0900 | From | Minchan Kim <> | Subject | Re: [PATCH 6/7] mm: page allocator: Limit when direct reclaim is used when compaction is deferred |
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On Mon, Nov 21, 2011 at 06:36:47PM +0000, Mel Gorman wrote: > If compaction is deferred, we enter direct reclaim to try reclaim the > pages that way. For small high-orders, this has a reasonable chance > of success. However, if the caller as specified __GFP_NO_KSWAPD to > limit the disruption to the system, it makes more sense to fail the > allocation rather than stall the caller in direct reclaim. This patch > will skip direct reclaim if compaction is deferred and the caller > specifies __GFP_NO_KSWAPD. > > Async compaction only considers a subset of pages so it is possible for > compaction to be deferred prematurely and not enter direct reclaim even > in cases where it should. To compensate for this, this patch also defers > compaction only if sync compaction failed. > > Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Minchan Kim <minchan.kim@gmail.com>
It does make sense to me.
-- Kind regards, Minchan Kim
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