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From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 23 May 2012 10:23:22 +0200
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Subject: Re: [Qemu-devel] [PATCH 1/2] sched: add virt sched domain for the
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To: Liu ping fan <kernelfans@gmail.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, Ingo Molnar <mingo@redhat.com>, Avi Kivity <avi@redhat.com>, Anthony Liguori <anthony@codemonkey.ws>

On Wed, 2012-05-23 at 16:10 +0800, Liu ping fan wrote:
> the movement of vcpu
> threads among host nodes will break the topology initialized by -numa
> option.=20

You want to remap vcpu to nodes? Are you bloody insane? cpu:node maps
are assumed static, you cannot make that a dynamic map and pray things
keep working.

Also, have you any idea how expensive it is to rebuild the topology vs
migrating the vcpu?