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

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Date:	Tue, 10 Jan 2012 11:54:26 -0500
From:	Youquan Song <youquan.song@...el.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Youquan Song <youquan.song@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, akpm@...ux-foundation.org, stable@...r.kernel.org,
	arjan@...ux.intel.com, len.brown@...el.com, anhua.xu@...el.com,
	chaohong.guo@...el.com, Youquan Song <youquan.song@...ux.intel.com>
Subject: Re: [PATCH] x86,sched: Fix sched_smt_power_savings totally broken

 
> Youquan, As far as I know both the
> sched_smt_power_savings/sched_mc_power_savings are broken for atleast an
> year.
> 
> Have you checked the state of 'sched_mc_power_savings' to see if it is
> working or gets addressed with your proposed patches?
Thanks Suresh!

We have verified that sched_mc_power_savings works well in mainline and
-tip tree, only sched_smt_power_savings broken.

Sorry. My proposed patch last night still need be refreshed. After I closely look
at SD_PREFER_SIBLING logic, there is possible a fighting which Peter has
mentioned it.

I will post a update patch soon.

-Youquan 

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