linux-kernel - Re: [PATCH 02/12] mm,migration: Do not try to migrate unmapped anonymous pages

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Message-ID: <4B7EC013.5090704@redhat.com>
Date:	Fri, 19 Feb 2010 11:45:07 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 02/12] mm,migration: Do not try to migrate unmapped anonymous
 pages

On 02/18/2010 01:02 PM, Mel Gorman wrote:
> rmap_walk_anon() was triggering errors in memory compaction that looks like
> use-after-free errors in anon_vma. The problem appears to be that between
> the page being isolated from the LRU and rcu_read_lock() being taken, the
> mapcount of the page dropped to 0 and the anon_vma was freed. This patch
> skips the migration of anon pages that are not mapped by anyone.
>
> Signed-off-by: Mel Gorman<mel@....ul.ie>

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

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