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

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Message-ID: <19346.8003.99263.626961@pilspetsen.it.uu.se>
Date:	Sat, 6 Mar 2010 10:24:19 +0100
From:	Mikael Pettersson <mikpe@...uu.se>
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

Christian Ehrhardt writes:
 > 
 > 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.
 > 
 > Timings for the test program in the original kernel code and
 > responsiveness of the system during the test improve dramatically.
 > 
 > NOTE: This needs an Ack from someone who can compile on arm and parisc.

Compile and boot-tested on an ARM ixp4xx machine.

Tested-by: Mikael Pettersson <mikpe@...uu.se> (ARM bits only)
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