Re: [PATCH V2] idle/intel_powerclamp: Redesign idle injection to use bandwidth control mechanism

From: Arjan van de Ven
Date: Fri Feb 13 2015 - 09:04:09 EST

Also, exposing these and root_task_group is of course vile. Not to
mention you change the user (cgroup) interface without mention.

In any case, I cannot see how this could ever work. Bandwidth is shared
across CPUs; nothing will even attempt to get CPUs to idle at the same

idle injection is only worth it if you can get package C states,
e.g. all cpus in the system are idle at the same time.

(and in powerclamp, the package C state %age is the target of the control
loop, since that's pretty much the amount of power reduced)

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