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

[Liu ping fan]

On Wed, May 23, 2012 at 4:23 PM, Peter Zijlstra <address@hidden> 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.
>