Date: Sat, 1 Dec 2007 20:36:43 +0100
From: Ingo Molnar <mingo@elte.hu>
To: David Rientjes <rientjes@google.com>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks
Message-ID: <20071201193643.GA10911@elte.hu>
References: <20071201092037.GA32544@elte.hu> <alpine.DEB.0.9999.0712011036340.10996@chino.kir.corp.google.com>
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* David Rientjes <rientjes@google.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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