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

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Date:	Sun, 02 Dec 2007 19:57:30 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks

Ingo Molnar <mingo@...e.hu> writes:

> this patch extends the soft-lockup detector to automatically
> detect hung TASK_UNINTERRUPTIBLE tasks. Such hung tasks are
> printed the following way:

That will likely trigger anytime a hard nfs/cifs mount loses its
server for 120s. To make this work you would need a new 
TASK_UNINTERRUPTIBLE_EXTERNAL_EVENT or similar and mark
all the places which depend on those.

I've also seen kernel modules that use semaphores like wait queues
While that gives a little funny results (high load average) it worked 
so far, until this patch.

-Andi
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