Message-ID: <4AE7397A.4010907@redhat.com>
Date: Tue, 27 Oct 2009 14:18:34 -0400
From: Rik van Riel <riel@redhat.com>
Organization: Red Hat, Inc
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To: Mel Gorman <mel@csn.ul.ie>
CC: Andrew Morton <akpm@linux-foundation.org>, stable@kernel.org,
       linux-kernel@vger.kernel.org,
       " <rjw@sisk.pl>, Kernel Testers List <kernel-testers@vger.kernel.org>"@redhat.com
Subject: Re: [PATCH 3/3] vmscan: Force kswapd to take notice faster when high-order
 watermarks are being hit
References: <1256650833-15516-1-git-send-email-mel@csn.ul.ie> <1256650833-15516-4-git-send-email-mel@csn.ul.ie>
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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@csn.ul.ie>

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

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