linux-kernel - Re: [PATCH 1/2] sched: add virt sched domain for the guest

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Message-ID: <CAFgQCTt+cmUWUB6GvE=Ki5ikC1P7YA_sGrvgUKKJ6c3VuqCsAg@mail.gmail.com>
Date:	Wed, 23 May 2012 16:34:03 +0800
From:	Liu ping fan <kernelfans@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	qemu-devel@...gnu.org, Ingo Molnar <mingo@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [PATCH 1/2] sched: add virt sched domain for the guest

On Wed, May 23, 2012 at 4:23 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 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?
>
No, do not rebuild the topology too frequently. Supposing vcpus in
node-A/B/C, now node-B is unplugged,
so we need to migrate some of vcpus from node-B to node-A, or to node-C.
>
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