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Message-ID: <45119D49.2040607@opersys.com>
Date: Wed, 20 Sep 2006 15:58:01 -0400
From: Karim Yaghmour <karim@...rsys.com>
To: Martin Bligh <mbligh@...gle.com>
CC: "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>,
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>,
Michael Davidson <md@...gle.com>
Subject: Re: [PATCH] Linux Kernel Markers
Martin Bligh wrote:
> You mean using the jump-over thing that was posted earlier?
> I thought the CPU erratas prevented doing that atomically
> properly. From my understanding of the last 24 hours discussion,
> it seemed like the ONLY thing we could do safely atomically was
> insert an int3. Which sucks, frankly, but still.
No. djprobes already does safely insert other stuff than just
int3, that's the whole point.
Here are the relevant postings by Hiramatsu-san:
http://marc.theaimsgroup.com/?l=linux-kernel&m=115875912510827&w=2
http://marc.theaimsgroup.com/?l=linux-kernel&m=115875867519302&w=2
Unless there's something *I* fundamentally misunderstood from
Hiramatsu-san's implementation and input, djprobes can replace
the 5-byte filler with a 5-byte unconditional jump. IOW your
mechanism works, no int3s involved.
Karim
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