Re: [PATCH 08/11] mm: compaction: Introduce sync-light migrationfor use by compaction

[Rik van Riel]

On 12/14/2011 10:41 AM, Mel Gorman wrote:
> This patch adds a lightweight sync migrate operation MIGRATE_SYNC_LIGHT
> mode that avoids writing back pages to backing storage. Async
> compaction maps to MIGRATE_ASYNC while sync compaction maps to
> MIGRATE_SYNC_LIGHT. For other migrate_pages users such as memory
> hotplug, MIGRATE_SYNC is used.
>
> This avoids sync compaction stalling for an excessive length of time,
> particularly when copying files to a USB stick where there might be
> a large number of dirty pages backed by a filesystem that does not
> support ->writepages.
>
> [aarcange@xxxxxxxxxx: This patch is heavily based on Andrea's work]
> Signed-off-by: Mel Gorman<mgorman@xxxxxxx>

Reviewed-by: Rik van Riel<riel@xxxxxxxxxx>

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