linux-kernel - Re: [PATCH 01/11] mm,migration: Take a reference to the anon

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Message-ID: <28c262361003140801m44083ad7o784f878d58085948@mail.gmail.com>
Date:	Mon, 15 Mar 2010 00:01:24 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 01/11] mm,migration: Take a reference to the anon_vma 
	before migrating

On Sat, Mar 13, 2010 at 1:41 AM, Mel Gorman <mel@....ul.ie> wrote:
> rmap_walk_anon() does not use page_lock_anon_vma() for looking up and
> locking an anon_vma and it does not appear to have sufficient locking to
> ensure the anon_vma does not disappear from under it.
>
> This patch copies an approach used by KSM to take a reference on the
> anon_vma while pages are being migrated. This should prevent rmap_walk()
> running into nasty surprises later because anon_vma has been freed.
>
> Signed-off-by: Mel Gorman <mel@....ul.ie>
> Acked-by: Rik van Riel <riel@...hat.com>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

BTW, This another refcount of anon_vma is merged  with KSM by [3/11].
Looks good to me.


-- 
Kind regards,
Minchan Kim
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