linux-kernel - Re: [PATCH, RFC] panic-note: Annotation from user space for panics

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Date:	Fri, 13 Nov 2009 13:50:36 +0200
From:	"Shargorodsky Atal (EXT-Teleca/Helsinki)" 
	<ext-atal.shargorodsky@...ia.com>
To:	ext David VomLehn <dvomlehn@...co.com>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"dwm2@...radead.org" <dwm2@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mpm@...enic.com" <mpm@...enic.com>
Subject: Re: [PATCH, RFC] panic-note: Annotation from user space for panics

On Thu, 2009-11-12 at 23:09 +0100, ext David VomLehn wrote:
> On Thu, Nov 12, 2009 at 02:50:41PM -0500, Paul Gortmaker wrote:
> > David VomLehn wrote:
> >> Allows annotation of panics to include platform information. It's no big
> >> deal to collect information, but way helpful when you are collecting
> >> failure reports from a eventual base of millions of systems deployed in
> >> other people's homes.
> ...
> > Why hook into panic() directly like this, vs. using the panic
> > notifier list? If you use that, and then put the data handling
> > magic that you need into your own kernel module that knows how
> > to interface with the reporting apps that you have, you can
> > do the whole thing without having to alter existing code, I think.
> 
> I agree--a panic notifier list is probably a better approach.
> 

That's what we currently use:

http://marc.info/?l=linux-kernel&m=125655380512117&w=2

Very simple and does the job.
Requires to rearrange the panic code a bit, though.
Namely, to move notifiers invocation before the call to kmsg_dump().
Dumpers were introduced by Simon Kagstrom here:

http://marc.info/?l=linux-kernel&m=125569530109871&w=2


Regards,
Atal

> David VL
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