[libvirt] [PATCH v2 0/4] Add cpu hotplug support to libvirt.

[Tang Chen]

Hi Viktor,

On 09/05/2012 04:54 PM, Viktor Mihajlovski wrote:
> I posted a comment some time ago about that. If you do not mount the
> cpuset controller, i.e for RHEL 6 you delete the cpuset line from
> /etc/cgconfig, the CPU affinity isn't controlled by cgroups any more but
> uses the old mechanism, which works as expected: take a host CPU offline
> and it will be removed from the process CPU mask and will show up again
> after onlining the host CPU.
> The only issue I currently see is that the display of virsh vcpuinfo and
> vcpupin is somewhat strange. Using taskset will however show the the
> correct affinity.
>
> I suggest that you try out that approach.

I saw your comment before. You are quite right.  :)

But the situation here is there are some other features in libvirt
using cpuset. For example, emulator-pin feature. If we remove cpuset in
the system, other features could be unusable.

And more, I found different cgroups are widely used in libvirt now.
I don't think removing cgroups from system is a good enough idea, though
it can be a work around.

What do you think? :)

Thanks. :)