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Re: [PATCH] Linux Kernel Markers

From: "Frank Ch. Eigler" <fche at redhat dot com>
To: "Martin J. Bligh" <mbligh at google dot com>
Cc: Ingo Molnar <mingo at elte dot hu>, Mathieu Desnoyers <mathieu dot desnoyers at polymtl dot ca>, "Frank Ch. Eigler" <fche at redhat dot com>, Paul Mundt <lethal at linux-sh dot org>, linux-kernel <linux-kernel at vger dot kernel dot org>, Jes Sorensen <jes at sgi dot com>, Andrew Morton <akpm at osdl dot org>, Tom Zanussi <zanussi at us dot ibm dot com>, Richard J Moore <richardj_moore at uk dot ibm dot com>, Michel Dagenais <michel dot dagenais at polymtl dot ca>, Christoph Hellwig <hch at infradead dot org>, Greg Kroah-Hartman <gregkh at suse dot de>, Thomas Gleixner <tglx at linutronix dot de>, William Cohen <wcohen at redhat dot com>, ltt-dev at shafik dot org, systemtap at sources dot redhat dot com, Alan Cox <alan at lxorguk dot ukuu dot org dot uk>
Date: Tue, 19 Sep 2006 11:46:12 -0400
Subject: Re: [PATCH] Linux Kernel Markers
References: <20060918234502.GA197@Krystal> <20060919081124.GA30394@elte.hu> <451008AC.6030006@google.com>

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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Follow-Ups:
- Re: [PATCH] Linux Kernel Markers
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References:
- [PATCH] Linux Kernel Markers
  - From: Mathieu Desnoyers
- Re: [PATCH] Linux Kernel Markers
  - From: Ingo Molnar
- Re: [PATCH] Linux Kernel Markers
  - From: Martin J. Bligh

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