Re: [PATCH 06/10] mm: vmscan: Have kswapd writeback pages based ondirty pages encountered, not priority

[Johannes Weiner]

On Thu, Apr 11, 2013 at 08:57:54PM +0100, Mel Gorman wrote:
> Currently kswapd queues dirty pages for writeback if scanning at an elevated
> priority but the priority kswapd scans at is not related to the number
> of unqueued dirty encountered.  Since commit "mm: vmscan: Flatten kswapd
> priority loop", the priority is related to the size of the LRU and the
> zone watermark which is no indication as to whether kswapd should write
> pages or not.
> 
> This patch tracks if an excessive number of unqueued dirty pages are being
> encountered at the end of the LRU.  If so, it indicates that dirty pages
> are being recycled before flusher threads can clean them and flags the
> zone so that kswapd will start writing pages until the zone is balanced.
> 
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
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