Messages in this thread | | | Date | Wed, 1 Dec 2010 11:28:28 +0100 | From | Johannes Weiner <> | Subject | Re: [PATCH 4/7] mm: migration: Allow migration to operate asynchronously and avoid synchronous compaction in the faster path |
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On Mon, Nov 22, 2010 at 03:43:52PM +0000, Mel Gorman wrote: > Migration synchronously waits for writeback if the initial passes fails. > Callers of memory compaction do not necessarily want this behaviour if the > caller is latency sensitive or expects that synchronous migration is not > going to have a significantly better success rate. > > This patch adds a sync parameter to migrate_pages() allowing the caller to > indicate if wait_on_page_writeback() is allowed within migration or not. For > reclaim/compaction, try_to_compact_pages() is first called asynchronously, > direct reclaim runs and then try_to_compact_pages() is called synchronously > as there is a greater expectation that it'll succeed. > > Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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