linux-kernel - Re: [patch v6 10/21] sched: get rq potential maximum utilization

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Date:	Tue, 02 Apr 2013 21:38:09 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, arjan@...ux.intel.com, bp@...en8.de,
	pjt@...gle.com, efault@....de, vincent.guittot@...aro.org,
	gregkh@...uxfoundation.org, preeti@...ux.vnet.ibm.com,
	viresh.kumar@...aro.org, linux-kernel@...r.kernel.org
Subject: Re: [patch v6 10/21] sched: get rq potential maximum utilization


>> +	nr_running = rq->nr_running ? rq->nr_running : 1;
> 
> This can be cleaned up with proper min/max().

yes, thanks
> 
>> +
>> +	return rt_util + cfs_util * nr_running;
> 
> Should this nr_running consider tasks in cfs_rq only?  Also it seems
> there's no upper bound so that it can possibly exceed FULL_UTIL.

Yes.
we need to consider task number:nr_running, otherwise cpu utilization
will never beyond FULL_UTIL, then we can not know if the cpu is overload.
So we need the possible maximum utilization bigger than FULL_UTIL.
> 


-- 
Thanks
    Alex
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