linux-kernel - Re: [patch v6 03/21] sched: only count runnable avg on cfs_rq's nr

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Message-ID: <515B9011.2000209@intel.com>
Date:	Wed, 03 Apr 2013 10:12:33 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Paul Turner <pjt@...gle.com>
CC:	Vincent Guittot <vincent.guittot@...aro.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>, gregkh@...uxfoundation.org,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch v6 03/21] sched: only count runnable avg on cfs_rq's nr_running

On 04/03/2013 09:23 AM, Paul Turner wrote:
> Nack:
> Vincent is correct, rq->avg is supposed to be the average time that an
> rq is runnable; this includes (for example) SCHED_RT.
> 
> It's intended to be more useful as a hint towards something like a
> power governor which wants to know how busy the CPU is in general.

Thanks PJT&Vincent. agree with your thought.
> 
>> On the other side, periodic LB balance on combined the cfs/rt load, but
>> removed the RT utilisation in cpu_power.
> 
> This I don't quite understand; these inputs are already time scaled (by decay).
> 
> Stated alternatively, what you want is:
>   "average load" / "available power", which is:
>   (rq->cfs.runnable_load_avg + rq->cfs.blocked_load_avg) / (cpu power
> scaled for rt)

Right. understand,


-- 
Thanks Alex
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