Re: [PATCH 6/7] mm: compaction: Perform a faster migration scan whenmigrating asynchronously

[Johannes Weiner]

On Mon, Nov 22, 2010 at 03:43:54PM +0000, Mel Gorman wrote:
> try_to_compact_pages() is initially called to only migrate pages asychronously
> and kswapd always compacts asynchronously. Both are being optimistic so it
> is important to complete the work as quickly as possible to minimise stalls.
> 
> This patch alters the scanner when asynchronous to only consider
> MIGRATE_MOVABLE pageblocks as migration candidates. This reduces stalls
> when allocating huge pages while not impairing allocation success rates as
> a full scan will be performed if necessary after direct reclaim.
> 
> Signed-off-by: Mel Gorman <mel@xxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
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