linux-kernel - Re: [PATCH v2] CPU hotplug, freezer: Fix bugs in CPU hotplug call path

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Message-ID: <4EA157C9.30500@linux.vnet.ibm.com>
Date:	Fri, 21 Oct 2011 17:00:17 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@....cz,
	len.brown@...el.com, mingo@...e.hu, akpm@...ux-foundation.org,
	suresh.b.siddha@...el.com, lucas.demarchi@...fusion.mobi,
	"linux-pm@...r.kernel.org >> Linux PM mailing list" 
	<linux-pm@...r.kernel.org>, rusty@...tcorp.com.au,
	vatsa@...ux.vnet.ibm.com, ashok.raj@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] CPU hotplug, freezer: Fix bugs in CPU hotplug call
 path

On 10/10/2011 04:18 PM, Peter Zijlstra wrote:
> On Sat, 2011-10-08 at 02:26 +0530, Srivatsa S. Bhat wrote:
>>
>> So, we should mutually exclude cpu hotplugging and freezing/thawing to
>> ensure that during the entire duration that the callbacks for the notified
>> event are running, the state introduced by that event holds good. 
> 
> Yes we should, but I'd rather see that done on a more fundamental level,
> and not frob yet another mutex in the already complex hotplug system.
> 

Sure, thank you for the feedback. I have now come up with another version
that doesn't introduce any new mutex. I'll post it out in a while.

-- 
Regards,
Srivatsa S. Bhat  <srivatsa.bhat@...ux.vnet.ibm.com>
Linux Technology Center,
IBM India Systems and Technology Lab
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