linux-kernel - Re: [PATCH v7 0/8] Tunable sched_mc_power

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Message-Id: <1231318755.3899.57.camel@marge.simson.net>
Date:	Wed, 07 Jan 2009 09:59:15 +0100
From:	Mike Galbraith <efault@....de>
To:	balbir@...ux.vnet.ibm.com
Cc:	svaidy@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v7 0/8] Tunable sched_mc_power_savings=n

I have a couple questions if you don't mind.

In wake_idle() there's an odd looking check for kthreads.  Why does it
matter if a kbuild task wakes kernel or userland helper thread?

I also don't see why sched_mc overrides domain tunings.  You can turn
NEWIDLE off and sched_mc remains as set, so it's a one-way override.  If
NEWIDLE is a requirement for sched_mc > 0, it seems only logical to set
sched_mc to 0 if the user explicitly disables NEWIDLE.

	-Mike

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