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

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Message-ID: <4511401B.4070809@hitachi.com>
Date:	Wed, 20 Sep 2006 22:20:27 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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>, Ingo Molnar <mingo@...e.hu>,
	ltt-dev@...fik.org, systemtap@...rces.redhat.com
Subject: Re: [PATCH] Linux Kernel Markers

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.

Thanks,

-- 
Masami HIRAMATSU
2nd Research Dept.
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com




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