linux-kernel - Re: [feature] automatically detect hung TASK

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Message-ID: <20071204000513.GB15296@elte.hu>
Date:	Tue, 4 Dec 2007 01:05:13 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, andi@...stfloor.org,
	penberg@...helsinki.fi, lkml@...ralstorm.puszkin.org,
	arjan@...radead.org, linux-kernel@...r.kernel.org,
	tglx@...utronix.de
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks


* Rafael J. Wysocki <rjw@...k.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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