linux-kernel - Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)

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Message-ID: <20070402132255.GB6739@ucw.cz>
Date:	Mon, 2 Apr 2007 13:22:55 +0000
From:	Pavel Machek <pavel@....cz>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Gautham R Shenoy <ego@...ibm.com>, akpm@...ux-foundation.org,
	paulmck@...ibm.com, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, vatsa@...ibm.com,
	Oleg Nesterov <oleg@...sign.ru>,
	"Rafael J. Wysocki" <rjw@...k.pl>, dipankar@...ibm.com,
	dino@...ibm.com, masami.hiramatsu.pt@...achi.com
Subject: Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2)

Hi!


> i'm wondering about how TASK_UNINTERRUPTIBLE tasks are handled by the 
> freezer: are they assumed frozen immediately, or do we wait until they 
> notice their PF_FREEZING and go into try_to_freeze()? I'd expect 

They have to wait. We need all tasks frozen _with no locks held_.

							Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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