Re: [patch v5 14/15] sched: power aware load balance

From: Alex Shi
Date: Thu Mar 21 2013 - 03:43:33 EST

On 03/20/2013 12:57 PM, Preeti U Murthy wrote:
> Neither core will be able to pull the task from the other to consolidate
> the load because the rq->util of t2 and t4, on which no process is
> running, continue to show some number even though they degrade with time
> and sgs->utils accounts for them. Therefore,
> for core1 and core2, the sgs->utils will be slightly above 100 and the
> above condition will fail, thus failing them as candidates for
> group_leader,since threshold_util will be 200.

Thanks for note, Preeti!

Did you find some real issue in some platform?
In theory, a totally idle cpu has a zero rq->util at least after 3xxms,
and in fact, I find the code works fine on my machines.

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