linux-kernel - Re: [PATCH v3 09/12] Revert "sched: Put rq's sched_avg under CONFIG_FAIR_GROUP

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Date:	Fri, 18 Jul 2014 09:27:52 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Dietmar Eggemann <dietmar.eggemann@....com>
Cc:	Vincent Guittot <vincent.guittot@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Mike Galbraith <efault@....de>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v3 09/12] Revert "sched: Put rq's sched_avg under
 CONFIG_FAIR_GROUP_SCHED"

On Mon, Jul 14, 2014 at 06:54:11PM +0100, Dietmar Eggemann wrote:
> __update_entity_runnable_avg() has an additional parameter 'running' so
> that it can be called for
> 
> a) sched_entities in update_entity_load_avg():
> 
>   __update_entity_runnable_avg(..., se->on_rq, cfs_rq->curr == se))
> 
> 
> b) rq's in update_rq_runnable_avg():
> 
>   __update_entity_runnable_avg(..., runnable, runnable);
> 
> I can see how it gives us two different signals for a sched_entity but
> for a rq?
> 
For rq, 

__update_entity_runnable_avg(..., runnable, runnable > 0)

Then, first one would be effectively CPU ConCurrency (fair and !fair) and
second one would be CPU (has task) running (or about CPU utilization for
fair and !fair), :)

Thanks,
Yuyang
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