linux-kernel - Re: [PATCH v5 7/7] sched: consider runnable load average in effective

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Message-ID: <51877970.8010303@intel.com>
Date:	Mon, 06 May 2013 17:35:44 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Paul Turner <pjt@...gle.com>
CC:	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	Ingo Molnar <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>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH v5 7/7] sched: consider runnable load average in effective_load

On 05/06/2013 05:06 PM, Paul Turner wrote:
> I don't think this is a good idea:
> 
> The problem with not using the instantaneous weight here is that you
> potentially penalize the latency of interactive tasks (similarly,
> potentially important background threads -- e.g. garbage collection).
> 
> Counter-intuitively we actually want such tasks on the least loaded
> cpus to minimize their latency.  If the load they contribute ever
> becomes more substantial we trust that periodic balance will start
> taking notice of them.

Sounds reasonable. Many thanks for your input, Paul!

So, will use the seconds try. :)
> 
> [ This is similar to why we have to use the instantaneous weight in
> calc_cfs_shares. ]
> 


-- 
Thanks
    Alex
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