Re: [PATCH 2/3] mm: vmscan: Do not stall on writeback during memorycompaction

[Rik van Riel]

On 04/11/2012 12:38 PM, Mel Gorman wrote:
> This patch stops reclaim/compaction entering sync reclaim as this was only
> intended for lumpy reclaim and an oversight. Page migration has its own
> logic for stalling on writeback pages if necessary and memory compaction
> is already using it.
>
> Waiting on page writeback is bad for a number of reasons but the primary
> one is that waiting on writeback to a slow device like USB can take a
> considerable length of time. Page reclaim instead uses wait_iff_congested()
> to throttle if too many dirty pages are being scanned.
>
> Signed-off-by: Mel Gorman<mgorman@xxxxxxx>

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

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