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Date: Tue, 07 May 2013 14:17:46 +0800
From: Alex Shi <alex.shi@intel.com>
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Paul Turner <pjt@google.com>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Borislav Petkov <bp@alien8.de>, Namhyung Kim <namhyung@kernel.org>,
        Mike Galbraith <efault@gmx.de>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Preeti U Murthy <preeti@linux.vnet.ibm.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>,
        Rik van Riel <riel@redhat.com>,
        Michael Wang <wangyun@linux.vnet.ibm.com>
Subject: Re: [PATCH v5 5/7] sched: compute runnable load avg in cpu_load and
 cpu_avg_load_per_task
References: <1367804711-30308-1-git-send-email-alex.shi@intel.com> <1367804711-30308-6-git-send-email-alex.shi@intel.com> <CAPM31RLJe19FH+RYipwm4kwtzmFHoS2xGTx4iZ9+qwDJZ_pf3A@mail.gmail.com> <20130506101936.GE13861@dyad.programming.kicks-ass.net> <CAPM31RJg87C0nO_tAaOGLaDCUAB+QmfV4LkNcwnk9j9voNocfg@mail.gmail.com> <20130506111041.GA15446@dyad.programming.kicks-ass.net>
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On 05/06/2013 07:10 PM, Peter Zijlstra wrote:
>> > The runnable_avgs themselves actually have a fair bit of history in
>> > them already (50% is last 32ms); but given that they don't need to be
>> > cut-off to respond to load being migrated I'm guessing we could
>> > actually potentially get by with just "instaneous" and "use averages"
>> > where appropriate?
> Sure,. worth a try. If things fall over we can always look at it again.
> 
>> > We always end up having to re-pick/tune them based on a variety of
>> > workloads; if we can eliminate them I think it would be a win.
> Agreed, esp. the plethora of weird idx things we currently have. If we need to
> re-introduce something it would likely only be the busy case and for that we
> can immediately link to the balance interval or so.
> 
> 
> 

I like to have try bases on this patchset. :)

First, we can remove the idx, to check if the removing is fine for our
benchmarks, kbuild, dbench, tbench, hackbench, aim7, specjbb etc.

If there are some regression. we can think more.

-- 
Thanks
    Alex