linux-kernel - [patch 2.6.30 0/4] Fix cpufreq locking dependency (resend)

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Message-Id: <20090703152514.903448283@polymtl.ca>
Date:	Fri, 03 Jul 2009 11:25:14 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	linux-kernel@...r.kernel.org,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Dave Jones <davej@...hat.com>,
	Thomas Renninger <trenn@...e.de>, cpufreq@...r.kernel.org,
	kernel-testers@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	rjw@...k.pl, Dave Young <hidave.darkstar@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: [patch 2.6.30 0/4] Fix cpufreq locking dependency (resend)

(sorry, quilt mail problems in the previous post, here is the resend)

Hi,

Here is a patchset applying on 2.6.30 which should fix the cpufreq locking
dependency. Sadly, my two main test machines does not seem to support cpufreq,
so I have only been able to perform very light testing. (I can't afford to lock
down my laptop right now).

I went for the most straightforward fix I could think of and kept the current
locking structure. As you will see, the second patch cleans up the error
handling paths of cpufreq add dev, which were a total mess.

As a general recommendation, creating scripts which does, concurrently :

cpu hotplug up/down
cpufreq sysfs actions
change between cpufreq governors
add governors on random CPU numbers

will likely help stress-testing cpufreq locking. I really did not like what I've
seen there. It looked _very_ fragile.

Hopefully this will be better with this patches, but again, testing is welcome.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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