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[libvirt] libvirt & cgroup support - why are vm cgroups created under libvirt cgroup?



Hello,
I'd like to use cgroups for resources counting and management, but I'd like 
to use blkio-cgroup controller as well. I created simple patch for libvirt adding
support for it (and I'd like to submit the patch once it's tested properly).
But it seems that blkio-cgroup controller doesn't support cgroups inside cgroups
(the way libvirt uses them - /cgroup/libvirt/vmxxx).
Is there some possibility libvirt would be adjusted to support separate toplevel
cgroup for each vm so blkio-cgroup could be used?
Or is there some important reason for the way it works now?
thanks a lot in advance for any reply
with best regards
nik

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