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

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Message-ID: <45184885.8020807@goop.org>
Date:	Mon, 25 Sep 2006 14:22:13 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.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

Mathieu Desnoyers wrote:
> Better idea : we could put a read/write dependency on a memory location.
>   

Yes, that works well.  And it needn't even exist:

	extern int __marker_sequencer;		/* doesn't exist, never referenced */

	asm volatile("first asm" : "+m" (__marker_sequencer));

	asm volatile("second asm" : "+m" (__marker_sequencer));

This keeps the asms ordered with respect to each other (and prevents to 
independent markers from being intermingled), but it doesn't prevent 
them from being re-ordered with respect to other code.

    J
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