From mboxrd@z Thu Jan  1 00:00:00 1970
From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 1/2] sched: add virt sched domain for the guest
Date: Wed, 23 May 2012 10:23:22 +0200
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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>
To: Liu ping fan <kernelfans@gmail.com>
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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. 

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?