linux-kernel - RE: [RFC PATCH 0/4]: affinity-on-next-touch

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Message-id: <004001c9eb53$71991300$54cb3900$@rwth-aachen.de>
Date:	Fri, 12 Jun 2009 13:46:37 +0200
From:	Stefan Lankes <lankes@...s.rwth-aachen.de>
To:	'Andi Kleen' <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, Lee.Schermerhorn@...com,
	linux-numa@...r.kernel.org,
	Boris Bierbaum <boris@...s.rwth-aachen.de>,
	'Brice Goglin' <Brice.Goglin@...ia.fr>
Subject: RE: [RFC PATCH 0/4]: affinity-on-next-touch


> > 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?

He enables the support of migration-on-fault via cpusets (echo 1 >
/dev/cpuset/migrate_on_fault).
Afterwards, every process could initiate migration-on-fault via mbind(...,
MPOL_MF_MOVE|MPOL_MF_LAZY).

> > 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?
 
We are planning to work in this area. I think that I could update these
patches. 
At least, I am able to support Lee.

Stefan

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