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

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Date:	Wed, 03 Apr 2013 10:15:01 +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

On 04/02/2013 05:02 PM, Namhyung Kim wrote:
>> > +	cfs_util = (FULL_UTIL - rt_util) > rq->util ? rq->util
>> > +			: (FULL_UTIL - rt_util);
>> > +	nr_running = rq->nr_running ? rq->nr_running : 1;
> This can be cleaned up with proper min/max().
> 
>> > +
>> > +	return rt_util + cfs_util * nr_running;
> Should this nr_running consider tasks in cfs_rq only?

use nr_running of cfs_rq seems better, but when use sched autogroup,
only cfs->nr_running just the active group number, not the total active
task number. :(

  Also it seems
> there's no upper bound so that it can possibly exceed FULL_UTIL.


-- 
Thanks Alex
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