linux-kernel - Re: [PATCH] mm: Check if any page in a pageblock is reserved before marking it MIGRATE

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Date:	Tue, 26 Apr 2011 08:34:10 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	John Stultz <john.stultz@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Arve Hj?nnev?g <arve@...roid.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: Check if any page in a pageblock is reserved before
 marking it MIGRATE_RESERVE

On Thu, Apr 21, 2011 at 06:34:03PM -0700, John Stultz wrote:
> From: Arve Hjønnevåg <arve@...roid.com>
> 
> This fixes a problem where the first pageblock got marked MIGRATE_RESERVE even
> though it only had a few free pages. This in turn caused no contiguous memory
> to be reserved and frequent kswapd wakeups that emptied the caches to get more
> contiguous memory.
> 
> CC: Dave Hansen <dave@...ux.vnet.ibm.com>
> CC: Mel Gorman <mgorman@...e.de>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Arve Hjønnevåg <arve@...roid.com>
> Acked-by: Mel Gorman <mel@....ul.ie>
> 
> [This patch was submitted and acked a little over a year ago
> (see: http://lkml.org/lkml/2010/4/6/172 ), but never seemingly
> made it upstream. Resending for comments. -jstultz]
> 
> Signed-off-by: John Stultz <john.stultz@...aro.org>

Whoops, should have spotted it slipped through. FWIW, I'm still happy
with my Ack being stuck onto it.

Thanks.

-- 
Mel Gorman
SUSE Labs
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