Date: Wed, 15 Aug 2012 16:47:15 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
cc: Arjan van de Ven <arjan@linux.intel.com>, Alex Shi <alex.shi@intel.com>,
        Suresh Siddha <suresh.b.siddha@intel.com>, vincent.guittot@linaro.org,
        svaidy@linux.vnet.ibm.com, Ingo Molnar <mingo@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Paul Turner <pjt@google.com>
Subject: Re: [discussion]sched: a rough proposal to enable power saving in
 scheduler
In-Reply-To: <1345041897.31459.95.camel@twins>
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References: <5028F12C.7080405@intel.com> <1345028738.31459.82.camel@twins>  <502BB000.60502@linux.intel.com> <1345041897.31459.95.camel@twins>
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On Wed, 15 Aug 2012, Peter Zijlstra wrote:

> On Wed, 2012-08-15 at 07:19 -0700, Arjan van de Ven wrote:
> > Ideally the scheduler builds up some history of the typical run
> > duration of the task (with a bias to more recent runs).
> > But... even then, the past is only a poor predictor for the future. 
> 
> PJTs patches do this. But yes, a crystal-ball instruction which
> completes in a single cycle would be most appreciated :-)

You could ask the S390 folks whether they could whip one up for proof
of concept. :)

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