linux-kernel - Re: CONFIG_NO_HZ + CONFIG_CPU_IDLE freeze the system (Was Re: [PATCH] acpi : remove power from acpi_processor

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Message-ID: <504FACD9.4020108@linaro.org>
Date:	Tue, 11 Sep 2012 23:27:53 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	John Stultz <john.stultz@...aro.org>
CC:	prarit@...hat.com, xen-devel@...ts.xensource.com,
	linaro-dev@...ts.linaro.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-pm@...r.kernel.org, Frederic Weisbecker <fweisbec@...il.com>,
	richardcochran@...il.com,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...nel.org,
	lenb@...nel.org
Subject: Re: CONFIG_NO_HZ + CONFIG_CPU_IDLE freeze the system (Was Re: [PATCH]
 acpi : remove power from acpi_processor_cx structure)

On 09/11/2012 02:18 AM, John Stultz wrote:
> On 09/10/2012 12:45 PM, Daniel Lezcano wrote:
>> On 09/10/2012 07:14 PM, John Stultz wrote:
>>> In the meantime, I'll try to reproduce on my T61. If you could send me
>>> your .config, I'd appreciate it.
>> http://pastebin.com/qSxqfdDK
>>
>> The header of the config file shows for a v3.5-rc7 because it is the
>> result of the git-bisect. If you keep this config file for the latest
>> kernel that should reproduce the problem.
>>
>> Let me know if you were able to reproduce the problem.
> Great! With this I was able to quickly reproduce the problem and I think
> I have a fix.
> 
> Would you mind testing the following patch? It seems to resolve the
> issue, but I've not yet run it through my test suite to make sure it
> didn't break anything else.
> 
> If both your and my testing comes back ok, I'll submit it to Thomas.

Sounds like this solves the problem. Without enough background on timers
in general, I don't have an opinion about the patch itself but I can
confirm the issue is no longer occurring.

Thanks
  -- Daniel

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