linux-kernel - Re: [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order watermarks are being hit

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Message-ID: <4AE7397A.4010907@redhat.com>
Date:	Tue, 27 Oct 2009 14:18:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	linux-kernel@...r.kernel.org,
	" <rjw@...k.pl>, Kernel Testers List <kernel-testers@...r.kernel.org>"@redhat.com
Subject: Re: [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order
 watermarks are being hit

On 10/27/2009 09:40 AM, Mel Gorman wrote:
> When a high-order allocation fails, kswapd is kicked so that it reclaims
> at a higher-order to avoid direct reclaimers stall and to help GFP_ATOMIC
> allocations. Something has changed in recent kernels that affect the timing
> where high-order GFP_ATOMIC allocations are now failing with more frequency,
> particularly under pressure. This patch forces kswapd to notice sooner that
> high-order allocations are occuring.
>
> Signed-off-by: Mel Gorman<mel@....ul.ie>

Reviewed-by: Rik van Riel <riel@...hat.com>

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