[libvirt] Global domain cpu.cfs_quota_us setup

[Daniel P. Berrange]

On Mon, Dec 21, 2015 at 02:47:14PM +0300, Alexander Burluka wrote:
> Hi!
> Thank you for answer, Daniel, I should excuse for a long delay before reply.
> It was caused by long offline discussion in our company .
> Our business logic needs this top level cgroup. Parallels Cloud Server 6
> users have use this
> cgroup for a long time and want similar functionality. Also we believe that
> VMWare virtual machines has specified limit:
> http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1033115
> "*Note*: For an SMP virtual machine, the sum of all vCPUs cannot exceed the
> specified limit.
>  For example, 4 vCPU virtual machine with a limit of 1200MHz and equal load
> among vCPUs would result in a max of 300MHz per vCPU."
> Would anyone mind if we implement this feature as an optional parameter in
> libvirt?

If the global limit is opt-in, then I don't see a strong reason to
object, as it is just giving mgmt apps further choice in how to control
CPU usage.

Regards,
Daniel
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