linux-kernel - Re: [PATCH] x86: optionally show last exception from/to register contents

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Message-Id: <20070813094520.26a3e6bc.randy.dunlap@oracle.com>
Date:	Mon, 13 Aug 2007 09:45:20 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Jan Beulich <jbeulich@...ell.com>, linux-kernel@...r.kernel.org,
	patches@...-64.org
Subject: Re: [PATCH] x86: optionally show last exception from/to register
 contents

On Mon, 13 Aug 2007 16:21:10 +0200 Andi Kleen wrote:

> > I though you did, but since I never saw it appear in any release, I posted
> > this one...
> 
> It's a little different (and somewhat hackish I admit) 
> ftp://firstfloor.org/pub/ak/x86_64/debug/last-branch
> It has far more overhead than yours of course.
> 
> The only way to merge something like that would be dynamic
> patching and I was never quite motivated for that.
> 
> > So especially with the first concern of yours - is it worth at all rev-ing this
> > patch to address the other change requests you voiced?
> 
> The patch is useful even with the race, just document somewhere
> that it is unreliable (perhaps in the printk itself) and do the
> other changes.

and add "ler" entry to Documentation/kernel-parameters.txt, please,
with what it means.

> I would also suggest to enable it by default.


---
~Randy
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