Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

From: Tejun Heo
Date: Tue Aug 25 2015 - 17:13:51 EST

Hello, Kame.

On Tue, Aug 25, 2015 at 11:36:25AM +0900, Kamezawa Hiroyuki wrote:
> I think I should explain my customer's use case of qemu + cpuset/cpu (via libvirt)
> (1) Isolating hypervisor thread.
> As already discussed, hypervisor threads are isolated by cpuset. But their purpose
> is to avoid _latency_ spike caused by hypervisor behavior. So, "nice" cannot be solution
> as already discussed.
> (2) Fixed rate vcpu service.
> With using cpu controller's quota/period feature, my customer creates vcpu models like
> Low(1GHz), Mid(2GHz), High(3GHz) for IaaS system.
> To do this, each vcpus should be quota-limited independently, with per-thread cpu control.
> Especially, the method (1) is used in several enterprise customers for stabilizing their system.
> Sub-process control should be provided by some way.

Can you please take a look at the proposal on my reply to Paul's
email? AFAICS, both of above cases should be fine with that.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at