linux-kernel - Re: [git pull] kgdb-light -v10

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Message-ID: <20080212201653.GA8005@one.firstfloor.org>
Date:	Tue, 12 Feb 2008 21:16:53 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Roland McGrath <roland@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [git pull] kgdb-light -v10

On Tue, Feb 12, 2008 at 02:34:51PM -0500, Frank Ch. Eigler wrote:
> Hi -
> 
> On Tue, Feb 12, 2008 at 10:20:10AM -0800, Andrew Morton wrote:
> > [...]  Bear in mind that one of the things you do with kgdb is to
> > modify kernel memory [...]
> 
> Just for completeness, keep in mind that one can already 
> do these sorts of things on a batch basis using systemtap:

You don't even need systemtap: it has been always possible with
gdb -write vmlinux /proc/kcore

The only value add of the kgdb stub is really that you can single
step too and do post mortem (although the later works fine using
kdump/crash these days too)

-Andi
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