[libvirt] [PATCH 4/7] qemu: Create or remove cgroup when doing vcpu hotpluging

[Martin Kletzander]

On 10/12/2012 11:50 AM, Osier Yang wrote:
> Various APIs use cgroup to either set or get the statistics of
> host or guest. Hotplug or hot unplug new vcpus without creating
> or removing the cgroup for the vcpus could cause problems for
> those APIs. E.g.
> 
> % virsh vcpucount dom
> maximum      config        10
> maximum      live          10
> current      config         1
> current      live           1
> 
> % virsh setvcpu dom 2
> 
> % virsh schedinfo dom --set vcpu_quota=1000
> Scheduler      : posix
> error: Unable to find vcpu cgroup for rhel6.2(vcpu: 1): No such file or
> directory
> 
> This patch fixes the problem by creating cgroups for each of the
> onlined vcpus, and destroying cgroups for each of the offlined
> vcpus.
> ---

No change, so my previous ACK stands.

Martin