[libvirt] [PATCH] qemu: Create or remove cgroup when doing vcpu (un)hotpluging
Martin Kletzander
mkletzan at redhat.com
Wed Oct 10 08:46:30 UTC 2012
On 10/09/2012 06:08 PM, Osier Yang wrote:
> Various APIs use cgroup to either set or get the statistics of
> host or guest. Hotplug or unhotplug 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.
> ---
> src/qemu/qemu_driver.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 53 insertions(+), 0 deletions(-)
>
ACK,
Martin
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