linux-kernel - Re: [RFC patch 1/4] sched: change cfs

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Date:	Mon, 17 Jun 2013 17:59:37 +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>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	Jason Low <jason.low2@...com>
Subject: Re: [RFC patch 1/4] sched: change cfs_rq load avg to unsigned long

On 06/17/2013 05:49 PM, Paul Turner wrote:
>>> >> Hi Alex,
>>> >>
>>> >> I just want to point out that we can't have more than 48388 tasks with
>>> >> highest priority on a runqueue with an unsigned long on a 32 bits
>>> >> system.  I don't know if we can reach such kind of limit on a 32bits
>>> >> machine ? For sure, not on an embedded system.
> This should be ok.
> 
> Note that:
>   runnable_load_avg = \Sum se->load_avg_contrib <= \Sum
> se->load.weight = cfs_rq->load.weight
> 
> And load_weight uses unsigned longs also.
> 
> blocked_load_avg must be also safe since anything appearing in blocked
> load could have appeared in runnable load and we've said that was ok
> above.
> 
> Reviewed-By: Paul Turner <pjt@...gle.com>
> 

thanks for review!

-- 
Thanks
    Alex
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