Date: Tue, 4 Dec 2007 01:05:13 +0100
From: Ingo Molnar <mingo@elte.hu>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Andrew Morton <akpm@linux-foundation.org>, andi@firstfloor.org,
       penberg@cs.helsinki.fi, lkml@astralstorm.puszkin.org,
       arjan@infradead.org, linux-kernel@vger.kernel.org, tglx@linutronix.de
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks
Message-ID: <20071204000513.GB15296@elte.hu>
References: <20071202165913.3eaebee6@laptopd505.fenrus.org> <200712031928.53659.rjw@sisk.pl> <20071203192426.GA8017@elte.hu> <200712032347.37723.rjw@sisk.pl>
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* Rafael J. Wysocki <rjw@sisk.pl> wrote:

> > > Er, it won't play well if that happen when tasks are frozen for 
> > > suspend.
> > 
> > right now any suspend attempt times out after 20 seconds:
> > 
> >   $ grep TIMEOUT kernel/power/process.c
> >   #define TIMEOUT (20 * HZ)
> >           end_time = jiffies + TIMEOUT;
> 
> This is the timeout for freezing tasks, but if the freezing succeeds, 
> they can stay in TASK_UNINTERRUPTIBLE for quite some more time, 
> especially during a hibernation (the tasks stay frozen until we power 
> off the system after saving the image).

ah, ok. So this was a live bug - thanks for the clarification.

	Ingo
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