Re: [PATCH 4/7] mm: migration: Allow migration to operateasynchronously and avoid synchronous compaction in the faster path

[Johannes Weiner]

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@xxxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
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