linux-kernel - Re: remove cpu hotplug bustification in cpufreq.

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Message-ID: <Pine.LNX.4.64.0607241752290.29649@g5.osdl.org>
Date:	Mon, 24 Jul 2006 17:59:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...l.org>
To:	Chuck Ebbert <76306.1226@...puserve.com>
cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Ashok Raj <ashok.raj@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Andrew Morton <akpm@...l.org>
Subject: Re: remove cpu hotplug bustification in cpufreq.

On Mon, 24 Jul 2006, Chuck Ebbert wrote:
> 
> I thought just the 'ondemand' governor was a problem?

The ondemand governor seems to be singled out not because it has unique 
problems, but because it seems to be used by Fedora Core for some strange 
reason.

I would judge that any bugs in cpufreq_ondemand.c are likely equally 
evident in cpufreq_conservative.c, for example. I think the two have the 
same background, and seem to have the same broken locking.

> That thing has been broken since day 1 AFAICT.  There are lots of
> reports of problems with it on the list.

See above. I seriously doubt this is ondemand-specific. The whole cpufreq 
locking seems to be very screwed up.

The current -git tree will complain about some of the more obvious 
problems. If you see a "Lukewarm IQ" message, it's a sign of somebody 
re-taking a cpu lock that is already held.

			Linus
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