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

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Date:	Sun, 2 Dec 2007 14:18:25 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.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

On Sun, 2 Dec 2007 22:19:25 +0100
Andi Kleen <andi@...stfloor.org> wrote:

> > 
> > Until now users had little direct recourse to get such problems
> > fixed. (we had sysrq-t, but that included no real metric of how
> > long a task was 
> 
> Actually task delay accounting can measure this now.  iirc someone
> had a latencytop based on it already.


I have written a latencytop tool, but it's not based quite on the task
delay accounting (it doesn't provide the right information to make such
a tool). I've not released the tool mostly because I'm not quite happy
about the kernel side yet... but if there's real interest I'll fix it
up soon and release it.

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