linux-kernel - Re: [PATCH] softirq softlockup debugging

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Message-ID: <20080624120639.GB10550@elte.hu>
Date:	Tue, 24 Jun 2008 14:06:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	a.p.zijlstra@...llo.nl, arjan@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] softirq softlockup debugging


* Vegard Nossum <vegard.nossum@...il.com> wrote:

> Hi,
> 
> I'm debugging a problem with a softirq that gets stuck for a long 
> time, so I wrote this patch to help find out what's going wrong.
> 
> I actually think it can be useful in general as well, see for example 
> http://www.kerneloops.org/search.php?search=__do_softirq&btnG=Function+Search
> 
> ..and these cases are virtually impossible to debug since we don't 
> know anything about *what* it was that got stuck. (The NMI watchdog 
> could help, though.)
> 
> The patch is #ifdef-ugly, I know... Suggestions are welcome.

i've applied it to tip/core/softlockup to give it some testing. (It 
needed a manual merge due to changes pending in that topic already)

	Ingo
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