linux-kernel - Re: [PATCH] Linux Kernel Markers 0.11 for 2.6.17

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Message-ID: <20060925231343.GA12011@Krystal>
Date:	Mon, 25 Sep 2006 19:13:43 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Martin Bligh <mbligh@...gle.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	prasanna@...ibm.com, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Mundt <lethal@...ux-sh.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Jes Sorensen <jes@....com>, 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>,
	Karim Yaghmour <karim@...rsys.com>,
	Pavel Machek <pavel@...e.cz>, Joe Perches <joe@...ches.com>,
	"Randy.Dunlap" <rdunlap@...otime.net>,
	"Jose R. Santos" <jrs@...ibm.com>
Subject: Re: [PATCH] Linux Kernel Markers 0.11 for 2.6.17

* Jeremy Fitzhardinge (jeremy@...p.org) wrote:
> If you're going to put different types in the .markers section 
> (presumably per-architecture, rather than different types for within one 
> architecture) you should probably also define a structure in the same 
> place, if nothing
> 

For now, I only expect two kinds of structures :

One for the architectures which implements the MARK_JUMP optimisation and one
where they don't. Does it make sense to assume that each architecture will offer
the possibility to write a 1 byte offset calculated from the difference between
two addresses ? If not, then, it can be useful to think of a per archtecture
structure, but module.c shall be modified accordingly too. So for now, I would
stay with only one definition in linux/marker.h and if we see the need for it,
we can put the structures in asm-*/marker.h and adapt module.c per architecture
accordingly (probably by using a macro).

Mathieu

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