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

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Message-ID: <CAPM31RLKf=3WnUmnXartb21HmdCFeimvtxgL_A3sjC8=UvC-Kw@mail.gmail.com>
Date:	Mon, 6 May 2013 03:00:23 -0700
From:	Paul Turner <pjt@...gle.com>
To:	Alex Shi <alex.shi@...el.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 Mon, May 6, 2013 at 2:35 AM, Alex Shi <alex.shi@...el.com> wrote:
> 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. :)

Sorry -- not sure what you mean here.  I'm suggesting leaving
effective_load() unchanged.
>>
>> [ This is similar to why we have to use the instantaneous weight in
>> calc_cfs_shares. ]
>>
>
>
> --
> Thanks
>     Alex
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