linux-kernel - Re: [PATCH] Linux Kernel Markers

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Message-ID: <20060919154612.GU3951@redhat.com>
Date:	Tue, 19 Sep 2006 11:46:12 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	"Martin J. Bligh" <mbligh@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, Andrew Morton <akpm@...l.org>,
	Tom Zanussi <zanussi@...ibm.com>,
	Richard J Moore <richardj_moore@...ibm.com>,
	Michel Dagenais <michel.dagenais@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Cohen <wcohen@...hat.com>, ltt-dev@...fik.org,
	systemtap@...rces.redhat.com, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] Linux Kernel Markers


Hi -

On Tue, Sep 19, 2006 at 08:11:40AM -0700, Martin J. Bligh wrote:

> [...]  Why don't we just copy the whole damned function somewhere
> else, and make an instrumented copy (as a kernel module)? Then
> reroute all the function calls through it [...]

Interesting idea.  Are you imagining this instrumented copy being
built at kernel compile time (something like building a "-g -O0"
parallel)?  Or compiled anew from original sources after deployment?
Or on-the-fly binary-level rewriting a la SPIN?

> OK, it's not completely trivial to do, but simpler than kprobes [...]

None of the three above are that easy.  Do you have an implementation
idea?


- FChE

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