linux-kernel - Re: MARKER mechanism, try 2

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Date:	Mon, 18 Sep 2006 18:28:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	"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>,
	"Martin J. Bligh" <mbligh@...igh.org>
Subject: Re: MARKER mechanism, try 2


* Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> It supports 5 modes :
> 
> - marker becomes nothing
> - marker calls printk
> - marker calls a tracer
> - marker puts a symbol (for kprobe)
> - marker puts a symbol and 5 NOPS for a jump probe.

just go for 'nothing' and the 5-NOP variant, and please implement 
support for it from within LTT, via a kprobe - if you want me to support 
this stuff for upstream inclusion. If we support any static tracer mode 
and LTT does not support the kprobe mode then we are back to square 1 
wrt. dependencies ...

	Ingo
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