Date: Sun, 2 Dec 2007 14:18:25 -0800
From: Arjan van de Ven <arjan@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>, Andi Kleen <andi@firstfloor.org>,
       linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks
Message-ID: <20071202141825.063356a2@laptopd505.fenrus.org>
In-Reply-To: <20071202211925.GA26414@one.firstfloor.org>
References: <20071201092037.GA32544@elte.hu>
	<p737ijwylet.fsf@bingen.suse.de>
	<20071202185945.GA25990@elte.hu>
	<20071202114152.3bf4332d@laptopd505.fenrus.org>
	<20071202200953.GA23994@one.firstfloor.org>
	<20071202202602.GA16480@elte.hu>
	<20071202204725.GA25891@one.firstfloor.org>
	<20071202211027.GA32282@elte.hu>
	<20071202211925.GA26414@one.firstfloor.org>
Organization: Intel
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On Sun, 2 Dec 2007 22:19:25 +0100
Andi Kleen <andi@firstfloor.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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