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

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Message-ID: <20071201193643.GA10911@elte.hu>
Date:	Sat, 1 Dec 2007 20:36:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Rientjes <rientjes@...gle.com>
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


* David Rientjes <rientjes@...gle.com> wrote:

> > this patch extends the soft-lockup detector to automatically detect 
> > hung TASK_UNINTERRUPTIBLE tasks. Such hung tasks are printed the 
> > following way:
> 
> Wouldn't a natural extension of this feature be to mark these hung 
> TASK_UNINTERRUPTIBLE tasks with a new thread flag such as TIF_HUNG for 
> the purposes of the OOM killer?

maybe, but we'd have to see how often this gets triggered. An OOM is 
something that could happen in any overloaded system - while a hung task 
is likely due to a kernel bug.

	Ingo
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