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

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Message-ID: <20071203135741.GB4245@elte.hu>
Date:	Mon, 3 Dec 2007 14:57:41 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andi Kleen <andi@...stfloor.org>,
	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


* Pekka Enberg <penberg@...helsinki.fi> wrote:

> Hi,
> 
> On Mon, Dec 03, 2007 at 12:59:00PM +0100, Ingo Molnar wrote:
> > > "audit thousands of callsites in 8 million lines of code first" is a
> > > nice euphemism for hiding from the blame forever. We had 10 years for it
> 
> On Dec 3, 2007 2:13 PM, Andi Kleen <andi@...stfloor.org> wrote:
> > Ok your approach is then to "let's warn about it and hope
> > it will go away"
> 
> It's more like "lets warn about it and fix the problems when we find 
> some." Btw, how is this different from how the lockdep patches went 
> in?

yeah, it's quite similar. (in fact this feature is expected to have a 
false positive rate lower than that of lockdep) The backtraces are 
essential as well, they help kernel developer find the bugs.

	Ingo
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