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

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Message-ID: <20060920133229.GA17032@Krystal>
Date:	Wed, 20 Sep 2006 09:32:29 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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>, Ingo Molnar <mingo@...e.hu>,
	ltt-dev@...fik.org, systemtap@...rces.redhat.com
Subject: Re: [PATCH] Linux Kernel Markers

* Masami Hiramatsu (masami.hiramatsu.pt@...achi.com) wrote:
> Hi,
> 
> Mathieu Desnoyers wrote:
> > Hello,
> > 
> > Following this huge discussion thread, I tried to come with a marker mechanism
> > (which is something everyone seems to agree that is a necessity) that would be
> > useful to each kind of tracing (dynamic and static) (concerned projects :
> > SystemTAP, LKET, LKST, LTTng) and even combinations of those. Religious
> > considerations aside, I really think that this kind of generic markup is
> > necessary to fill *everybody*'s need. If I forgot about a specific genericity
> > aspect, please tell me.
> > 
> > I take for agreed that both static and dynamic tracing are useful for different
> > needs and that a full markup must support both and combinations, letting the
> > user or the distribution choose.
> 
> Basically, I like this static marker concept.
> But I wonder why wouldn't you use the architecture-independent
> marker which SystemTap already supports.
> If we use NOPs, it highly depends on architecture, and is hard
> to port.
> 

Hi Masami,

Are you talking about the marker presented by Frank in his OLS paper (
void dest() = NULL; if(dest) dest()) ? I think it is a very good idea to use it
instead of nops.

Mathieu

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