Re: [RFC PATCH 0/4]: affinity-on-next-touch

From: Andi Kleen <andi@firstfloor.org>
To: Stefan Lankes <lankes@lfbs.rwth-aachen.de>
Cc: "'Andi Kleen'" <andi@firstfloor.org>,
	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>
Subject: Re: [RFC PATCH 0/4]: affinity-on-next-touch
Date: Fri, 12 Jun 2009 12:32:51 +0200	[thread overview]
Message-ID: <20090612103251.GJ25568@one.firstfloor.org> (raw)
In-Reply-To: <000001c9eac4$cb8b6690$62a233b0$@rwth-aachen.de>

On Thu, Jun 11, 2009 at 08:45:29PM +0200, Stefan Lankes wrote:
> > 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. 

That's great to know.

I didn't think he had a per process setting though, did he?

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

Not to much knowledge. Maybe Lee will pick them up again now that there
are more use cases.

If he doesn't have time maybe you could update them?

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.