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

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Message-ID: <45117D4D.3040408@opersys.com>
Date:	Wed, 20 Sep 2006 13:41:33 -0400
From:	Karim Yaghmour <karim@...rsys.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	Martin Bligh <mbligh@...gle.com>, prasanna@...ibm.com,
	Andrew Morton <akpm@...l.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	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>
Subject: Re: [PATCH] Linux Kernel Markers


Hello Hiramatsu-san,

So here's a more intelligent answer than last time :)

Masami Hiramatsu wrote:
> This method is very similar to the djprobe.
> And I had gotten the same idea to support preemptive kernel.
...
> This means the below code, doesn't this?
> ---
> 	jmp 1f /* short jump consumes 2 bytes */
> 	nop
> 	nop
> 	nop
> 1:
> ---

YES, as pointed out by Mathieu, this does essentially the same.
And, yes, as mentioned earlier, this should work fine on
preemptable kernels.

> I think the djprobe can provide most of functionalities which
> your idea requires.

Indeed.

Thanks,

Karim

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