Re: [PATCH 3/6] mm: kswapd: Use the order that kswapd wasreclaiming at for sleeping_prematurely()

[Eric B Munson]

On Fri, 10 Dec 2010, Mel Gorman wrote:

> Before kswapd goes to sleep, it uses sleeping_prematurely() to check if
> there was a race pushing a zone below its watermark. If the race happened,
> it stays awake. However, balance_pgdat() can decide to reclaim at order-0
> if it decides that high-order reclaim is not working as expected. This
> information is not passed back to sleeping_prematurely().  The impact is
> that kswapd remains awake reclaiming pages long after it should have gone
> to sleep. This patch passes the adjusted order to sleeping_prematurely and
> uses the same logic as balance_pgdat to decide if it's ok to go to sleep.
> 
> Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
> Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

Reviewed-by: Eric B Munson <emunson@xxxxxxxxx>

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