From: Chris Wright <chrisw@sous-sol.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
kvm list <kvm@vger.kernel.org>,
dipankar@in.ibm.com, Alexander Graf <agraf@suse.de>,
qemu-devel Developers <qemu-devel@nongnu.org>,
Chris Wright <chrisw@sous-sol.org>,
bharata@linux.vnet.ibm.com, Vaidyanathan S <svaidy@in.ibm.com>
Subject: Re: [RFC PATCH] Exporting Guest RAM information for NUMA binding
Date: Wed, 30 Nov 2011 08:33:27 -0800 [thread overview]
Message-ID: <20111130163327.GD13696@sequoia.sous-sol.org> (raw)
In-Reply-To: <1322670315.2921.288.camel@twins>
* Peter Zijlstra (a.p.zijlstra@chello.nl) wrote:
> On Wed, 2011-11-30 at 21:52 +0530, Dipankar Sarma wrote:
> >
> > Also, if at all topology changes due to migration or host kernel decisions,
> > we can make use of something like VPHN (virtual processor home node)
> > capability on Power systems to have guest kernel update its topology
> > knowledge. You can refer to that in
> > arch/powerpc/mm/numa.c.
>
> I think that fail^Wfeature of PPC is terminally broken. You simply
> cannot change the topology after the fact.
Agreed, there's too many things that consult topology once and never
look back.
WARNING: multiple messages have this Message-ID (diff)
From: Chris Wright <chrisw@sous-sol.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
kvm list <kvm@vger.kernel.org>,
dipankar@in.ibm.com, Alexander Graf <agraf@suse.de>,
qemu-devel Developers <qemu-devel@nongnu.org>,
Chris Wright <chrisw@sous-sol.org>,
bharata@linux.vnet.ibm.com, Vaidyanathan S <svaidy@in.ibm.com>
Subject: Re: [Qemu-devel] [RFC PATCH] Exporting Guest RAM information for NUMA binding
Date: Wed, 30 Nov 2011 08:33:27 -0800 [thread overview]
Message-ID: <20111130163327.GD13696@sequoia.sous-sol.org> (raw)
In-Reply-To: <1322670315.2921.288.camel@twins>
* Peter Zijlstra (a.p.zijlstra@chello.nl) wrote:
> On Wed, 2011-11-30 at 21:52 +0530, Dipankar Sarma wrote:
> >
> > Also, if at all topology changes due to migration or host kernel decisions,
> > we can make use of something like VPHN (virtual processor home node)
> > capability on Power systems to have guest kernel update its topology
> > knowledge. You can refer to that in
> > arch/powerpc/mm/numa.c.
>
> I think that fail^Wfeature of PPC is terminally broken. You simply
> cannot change the topology after the fact.
Agreed, there's too many things that consult topology once and never
look back.
next prev parent reply other threads:[~2011-11-30 16:33 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-29 18:45 [Qemu-devel] [RFC PATCH] Exporting Guest RAM information for NUMA binding Bharata B Rao
2011-10-29 19:57 ` Alexander Graf
2011-10-29 19:57 ` [Qemu-devel] " Alexander Graf
2011-10-30 9:32 ` Vaidyanathan Srinivasan
2011-10-30 9:32 ` [Qemu-devel] " Vaidyanathan Srinivasan
2011-11-08 17:33 ` Chris Wright
2011-11-08 17:33 ` [Qemu-devel] " Chris Wright
2011-11-21 15:18 ` Bharata B Rao
2011-11-21 15:18 ` Bharata B Rao
2011-11-21 15:25 ` Peter Zijlstra
2011-11-21 15:25 ` [Qemu-devel] " Peter Zijlstra
2011-11-21 16:00 ` Bharata B Rao
2011-11-21 17:03 ` Peter Zijlstra
2011-11-21 17:03 ` [Qemu-devel] " Peter Zijlstra
2011-11-21 22:50 ` Chris Wright
2011-11-21 22:50 ` [Qemu-devel] " Chris Wright
2011-11-22 1:57 ` Anthony Liguori
2011-11-22 1:57 ` Anthony Liguori
2011-11-22 1:51 ` Anthony Liguori
2011-11-22 1:51 ` Anthony Liguori
2011-11-23 15:03 ` Andrea Arcangeli
2011-11-23 15:03 ` Andrea Arcangeli
2011-11-23 18:34 ` Alexander Graf
2011-11-23 18:34 ` Alexander Graf
2011-11-23 20:19 ` Andrea Arcangeli
2011-11-23 20:19 ` [Qemu-devel] " Andrea Arcangeli
2011-11-30 16:22 ` Dipankar Sarma
2011-11-30 16:22 ` Dipankar Sarma
2011-11-30 16:25 ` Peter Zijlstra
2011-11-30 16:25 ` [Qemu-devel] " Peter Zijlstra
2011-11-30 16:33 ` Chris Wright [this message]
2011-11-30 16:33 ` Chris Wright
2011-11-30 17:41 ` Andrea Arcangeli
2011-11-30 17:41 ` [Qemu-devel] " Andrea Arcangeli
2011-12-01 17:25 ` Dipankar Sarma
2011-12-01 17:25 ` Dipankar Sarma
2011-12-01 17:36 ` Andrea Arcangeli
2011-12-01 17:36 ` [Qemu-devel] " Andrea Arcangeli
2011-12-01 17:49 ` Dipankar Sarma
2011-12-01 17:49 ` Dipankar Sarma
2011-12-01 17:40 ` Peter Zijlstra
2011-12-01 17:40 ` Peter Zijlstra
2011-12-22 11:01 ` Marcelo Tosatti
2011-12-22 11:01 ` Marcelo Tosatti
2011-12-22 17:13 ` Anthony Liguori
2011-12-22 17:13 ` Anthony Liguori
2011-12-22 17:55 ` Marcelo Tosatti
2011-12-22 17:55 ` Marcelo Tosatti
2011-12-22 19:04 ` Peter Zijlstra
2011-12-22 19:04 ` [Qemu-devel] " Peter Zijlstra
2011-12-22 11:24 ` Marcelo Tosatti
2011-12-22 11:24 ` [Qemu-devel] " Marcelo Tosatti
2011-11-21 18:03 ` Avi Kivity
2011-11-21 18:03 ` [Qemu-devel] " Avi Kivity
2011-11-21 19:31 ` Peter Zijlstra
2011-11-21 19:31 ` Peter Zijlstra
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