linux-kernel - Re: [PATCH 0/3] cpu: idle state framework for offline CPUs.

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Message-ID: <20090812115806.GK24339@elf.ucw.cz>
Date:	Wed, 12 Aug 2009 13:58:06 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Joel Schopp <jschopp@...tin.ibm.com>,
	"Brown, Len" <len.brown@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Balbir Singh <balbir@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"Darrick J. Wong" <djwong@...ibm.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] cpu: idle state framework for offline CPUs.

Hi!

> May be having (to pick a number) 3 possible offline states for all
> platforms with one for halt equivalent and one for deepest possible that
> CPU can handle and one for deepest possible that platform likes for
> C-states may make sense. Will keeps things simpler in terms of usage
> expectations and possibly reduce the misuse oppurtubity?

Maybe just going to the deepest offline state automatically is the
easiest option?

cpu hotplug/unplug should be rare-enough operation that the latencies
do not really matter, right?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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