From: Mikael Pettersson <mikpe@it.uu.se>
To: Christian Ehrhardt <lk@c--e.de>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
linux-mm@kvack.org
Subject: Re: [PATCH] rmap: Fix Bugzilla Bug #5493
Date: Sat, 6 Mar 2010 10:24:19 +0100 [thread overview]
Message-ID: <19346.8003.99263.626961@pilspetsen.it.uu.se> (raw)
In-Reply-To: <20100305093834.GG17078@lisa.in-ulm.de>
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@it.uu.se> (ARM bits only)
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prev parent reply other threads:[~2010-03-06 9:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-05 9:38 Christian Ehrhardt
2010-03-05 14:10 ` Rik van Riel
2010-03-06 1:02 ` Christian Ehrhardt
2010-03-06 2:00 ` Johannes Weiner
2010-03-06 14:44 ` Christian Ehrhardt
2010-03-06 1:35 ` Kyle McMartin
2010-03-06 9:24 ` Mikael Pettersson [this message]
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