linux-kernel - Re: [PATCH] x86,sched: Fix sched_smt_power

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Message-ID: <4F0AF5F5.9080403@linux.intel.com>
Date:	Mon, 09 Jan 2012 06:13:09 -0800
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Youquan Song <youquan.song@...el.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, akpm@...ux-foundation.org, stable@...r.kernel.org,
	suresh.b.siddha@...el.com, len.brown@...el.com, anhua.xu@...el.com,
	chaohong.guo@...el.com,
	Youquan Song <youquan.song@...ux.intel.com>,
	Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH] x86,sched: Fix sched_smt_power_savings totally broken

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)


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