[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

Re: [libvirt] [PATCH RESEND RFC v4 1/6] Introduce the function virCgroupForVcpu



On Thu, Jul 21, 2011 at 10:08:03AM +0800, Wen Congyang wrote:
> Introduce the function virCgroupForVcpu() to create sub directory for each vcpu.

I'm far from convinced that this is a good idea. Setting policies on
individual VCPUs is giving the host admin a misleading illusion of
control over individual guest VCPUs. The problem is that QEMU has
many non-VCPU threads which consume non-trivial CPU time. CPU time
generated by a CPU in the guest, does not neccessarily map to a VCPU
thread in the host, but could instead go to a I/O thread or a display
thread, etc.

IMHO we should only be doing controls at the whole VM level here.

Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]