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

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Date:	Mon, 10 Oct 2011 12:48:59 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
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@...ts.linux-foundation.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 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.



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