On 05/23/2012 01:48 AM, Peter Zijlstra wrote: > On Wed, 2012-05-23 at 16:34 +0800, Liu ping fan wrote: >> > so we need to migrate some of vcpus from node-B to node-A, or to >> > node-C. > This is absolutely broken, you cannot do that. > > A guest task might want to be node affine, it looks at the topology sets > a cpu affinity mask and expects to stay on that node. > > But then you come along, and flip one of those cpus to another node. The > guest task will now run on another node and get remote memory accesses. Insane, sure. But, if the node has physically gone away, what do we do? I think we've got to either kill the guest, or let it run somewhere suboptimal. Sounds like you're advocating killing it. ;) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
