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From: Stefan Lankes <lankes@lfbs.rwth-aachen.de>
To: "'Andi Kleen'" <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org, Lee.Schermerhorn@hp.com,
       linux-numa@vger.kernel.org, Boris Bierbaum <boris@lfbs.rwth-aachen.de>,
       "'Brice Goglin'" <Brice.Goglin@inria.fr>
References: <000c01c9d212$4c244720$e46cd560$@rwth-aachen.de>
 <87zldjn597.fsf@basil.nowhere.org>
In-reply-to: <87zldjn597.fsf@basil.nowhere.org>
Subject: RE: [RFC PATCH 0/4]: affinity-on-next-touch
Date: Thu, 11 Jun 2009 20:45:29 +0200
Organization: Chair for Operating Systems, RWTH Aachen University
Message-id: <000001c9eac4$cb8b6690$62a233b0$@rwth-aachen.de>
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> Your patches seem to have a lot of overlap with
> Lee Schermerhorn's old migrate memory on cpu migration patches.
> I don't know the status of those.

I analyze Lee Schermerhorn's migrate memory on cpu migration patches
(http://free.linux.hp.com/~lts/Patches/PageMigration/). I think that Lee
Schermerhorn add similar functionalities to the kernel. He called the
"affinity-on-next-touch" functionality "migrate_on_fault" and uses in his
patches the normal NUMA memory policies. Therefore, his solution fits better
to the Linux kernel. I tested his patches with our test applications and got
nearly the same performance results. 

I found only patches for the kernel 2.6.25-rc2-mm1. Does someone develop
these patches further?

Stefan


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