From: Brice Goglin <Brice.Goglin@inria.fr>
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>
Subject: Re: [RFC PATCH 0/4]: affinity-on-next-touch
Date: Fri, 12 Jun 2009 14:30:06 +0200 [thread overview]
Message-ID: <4A324A4E.1060405@inria.fr> (raw)
In-Reply-To: <004001c9eb53$71991300$54cb3900$@rwth-aachen.de>
Stefan Lankes wrote:
> 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).
So mbind(MPOL_MF_LAZY) is taking care of changing page protection so as
to generate page-faults on next-touch? (instead of your madvise)
Is it migrating the whole memory area? Or only single pages?
Then, what's happening with MPOL_MF_LAZY in the kernel? Is it actually
stored in the mempolicy? If so, couldn't another fault later cause
another migration?
Or is MPOL_MF_LAZY filtered out of the policy once the protection of all
PTE has been changed?
I don't see why we need a new mempolicy here. If we are migrating single
pages, migrate-on-next-touch looks like a page-attribute to me. There
should be nothing to store in a mempolicy/VMA/whatever.
Brice
next prev parent reply other threads:[~2009-06-12 12:30 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <000c01c9d212$4c244720$e46cd560$@rwth-aachen.de>
2009-05-11 13:22 ` [RFC PATCH 0/4]: affinity-on-next-touch Andi Kleen
2009-05-11 13:32 ` Brice Goglin
2009-05-11 14:54 ` Stefan Lankes
2009-05-11 16:37 ` Andi Kleen
2009-05-11 17:22 ` Stefan Lankes
2009-06-11 18:45 ` Stefan Lankes
2009-06-12 10:32 ` Andi Kleen
2009-06-12 11:46 ` Stefan Lankes
2009-06-12 12:30 ` Brice Goglin [this message]
2009-06-12 13:21 ` Stefan Lankes
2009-06-12 13:48 ` Stefan Lankes
2009-06-16 2:39 ` Lee Schermerhorn
2009-06-16 13:58 ` Stefan Lankes
2009-06-16 14:59 ` Lee Schermerhorn
2009-06-17 1:22 ` KAMEZAWA Hiroyuki
2009-06-17 12:02 ` Lee Schermerhorn
2009-06-17 7:45 ` Stefan Lankes
2009-06-18 4:37 ` Lee Schermerhorn
2009-06-18 19:04 ` Lee Schermerhorn
2009-06-19 15:26 ` Lee Schermerhorn
2009-06-19 15:41 ` Balbir Singh
2009-06-19 15:59 ` Lee Schermerhorn
2009-06-19 21:19 ` Stefan Lankes
2009-06-22 12:34 ` Brice Goglin
2009-06-22 14:24 ` Lee Schermerhorn
2009-06-22 15:28 ` Brice Goglin
2009-06-22 16:55 ` Lee Schermerhorn
2009-06-22 17:06 ` Brice Goglin
2009-06-22 17:59 ` Stefan Lankes
2009-06-22 19:10 ` Brice Goglin
2009-06-22 20:16 ` Stefan Lankes
2009-06-22 20:34 ` Brice Goglin
2009-06-22 14:32 ` Stefan Lankes
2009-06-22 14:56 ` Lee Schermerhorn
2009-06-22 15:42 ` Stefan Lankes
2009-06-22 16:38 ` Lee Schermerhorn
2009-06-16 2:25 ` Lee Schermerhorn
2009-06-20 7:24 ` Brice Goglin
2009-06-22 13:49 ` Lee Schermerhorn
2009-06-16 2:21 ` Lee Schermerhorn
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