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

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Message-ID: <20071203135547.GA4245@elte.hu>
Date:	Mon, 3 Dec 2007 14:55:47 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Radoslaw Szkodzinski <lkml@...ralstorm.puszkin.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


* Andi Kleen <andi@...stfloor.org> wrote:

> I would still appreciate if you could state what default value you 
> plan to set the backtrace sysctl to in the submitted patch.

there's no "backtrace sysctl" planned for the moment. This "hung tasks" 
debugging feature can be disabled/enabled on a wide scale already:

 - in the .config

 - runtime, temporarily, via:

     echo 0 > /proc/sys/kernel/hung_task_timeout_secs

 - runtime, permanently, via adding:

     kernel.hung_task_timeout_secs = 0

   to /etc/sysctl.conf.

the backtrace, as other posters have stated it in this thread too, is 
very useful, so i'll not remove it from the printout.

	Ingo
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