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Re: [libvirt] [PATCH] qemu: Create or remove cgroup when doing vcpu (un)hotpluging

On 2012年10月10日 17:11, Peter Krempa wrote:
On 10/09/12 18:08, 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

This patch fixes the problem by creating cgroups for each of the
onlined vcpus, and destroying cgroups for each of the offlined
src/qemu/qemu_driver.c | 53
1 files changed, 53 insertions(+), 0 deletions(-)

s/unhotplug/hotunplug/g in your patch

The code looks fine, so Martin's ACK stands.

Thanks, but can you review more? :-)

More patches to improve vcpupin related stuffs are posted, since
they are related with each other tightly, better to push together
after a thorough reviewing.



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