linux-kernel - Re: [PATCH] rmap: Fix Bugzilla Bug #5493

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Message-ID: <4B9110ED.5000703@redhat.com>
Date:	Fri, 05 Mar 2010 09:10:53 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Christian Ehrhardt <lk@...e.de>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	linux-mm@...ck.org
Subject: Re: [PATCH] rmap: Fix Bugzilla Bug #5493

On 03/05/2010 04:38 AM, Christian Ehrhardt wrote:
>
> Hi,
>
> this patch fixes bugzilla Bug
>
>          http://bugzilla.kernel.org/show_bug.cgi?id=5493
>
> This bug describes a search complexity failure in rmap if a single
> anon_vma has a huge number of vmas associated with it.
>
> The patch makes the vma prio tree code somewhat more reusable and then uses
> that to replace the linked list of vmas in an anon_vma with a prio_tree.

Your patch will not apply against a current -mm, because it
conflicts with my anon_vma linking patches (which attacks
another "rmap walks too many vmas" failure mode).

Please rediff your patch against the latest -mm tree.
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