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Date: Mon, 09 Jan 2012 06:13:09 -0800
From: Arjan van de Ven <arjan@linux.intel.com>
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To: Peter Zijlstra <peterz@infradead.org>
CC: Youquan Song <youquan.song@intel.com>,
	linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de,
	hpa@zytor.com, akpm@linux-foundation.org, stable@vger.kernel.org,
	suresh.b.siddha@intel.com, len.brown@intel.com, anhua.xu@intel.com,
	chaohong.guo@intel.com,
	Youquan Song <youquan.song@linux.intel.com>,
	Paul Turner <pjt@google.com>
Subject: Re: [PATCH] x86,sched: Fix sched_smt_power_savings totally broken
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On 1/9/2012 2:28 AM, Peter Zijlstra wrote:
> On Mon, 2012-01-09 at 11:06 +0100, Peter Zijlstra wrote:
>> I'm >< close to committing a patch removing all the power_saving
>> magic from the scheduler. 
> 
> Unless someone steps up that says they care about this crap and are
> willing to clean it up this goes in...
> 

there is one legitimate choice to make in the scheduler, which is a real
honest preference:
the spread out versus "sort left" preference.

that doesn't need 15 knobs, that needs one.
I can totally buy that this might be easiest done by ripping out all
existing stuff, and then doing something relatively simple
(say, in the, "which CPU to run at" logic, a minor bias)