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

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Message-ID: <20071202235959.GA26636@one.firstfloor.org>
Date:	Mon, 3 Dec 2007 01:00:00 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks

> Delay accounting (or the /proc/<PID>/sched fields that i added recently) 
> only get updated once a task has finished its unreasonably long delay 
> and has scheduled. 

If it is stuck forever then you can just use sysrq-t

If it recovers delay accounting will catch it.

> detected_ this way. This is a debugging facility that clearly belongs 
> into the kernel. 

My worry is that it will flag various legitimate cases. So far 
you seem to try to just hand-wave them away.

-Andi
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