From: "Frank Ch. Eigler" <fche@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Vara Prasad <prasadav@us.ibm.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
"Frank Ch. Eigler" <fche@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Paul Mundt <lethal@linux-sh.org>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
linux-kernel <linux-kernel@vger.kernel.org>,
Jes Sorensen <jes@sgi.com>, Andrew Morton <akpm@osdl.org>,
Tom Zanussi <zanussi@us.ibm.com>,
Richard J Moore <richardj_moore@uk.ibm.com>,
Michel Dagenais <michel.dagenais@polymtl.ca>,
Christoph Hellwig <hch@infradead.org>,
Greg Kroah-Hartman <gregkh@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
William Cohen <wcohen@redhat.com>,
"Martin J. Bligh" <mbligh@mbligh.org>,
systemtap <systemtap@sourceware.org>
Subject: Re: tracepoint maintainance models
Date: Fri, 6 Oct 2006 09:01:56 -0400 [thread overview]
Message-ID: <20061006130156.GA3566@redhat.com> (raw)
In-Reply-To: <1160112791.30146.12.camel@localhost.localdomain>
Hi -
On Fri, Oct 06, 2006 at 01:33:11AM -0400, Steven Rostedt wrote:
> Coming into this really late, and I'm still behind in reading this and
> related threads, but I want to throw this idea out, and it's getting
> late.
> [...]
> #define MARK(label, var) \
> asm ("debug_" #label ":\n" \
> ".section .data\n" \
> #label "_" #var ": xor %0,%0\n" \
> ".previous" : : "r"(var))
> [...]
> $ gcc -O2 -o mark mark.c
> $ ./mark
> func y is in reg B at 0x80483ce
> [...]
Clever.
> Now the question is, isn't MARK() in this code a non intrusive marker?
Not quite. The assembly code forces gcc to materialize the data that
it might already have inlined, and to borrow a register for the
duration. It's still a neat idea though.
- FChE
next prev parent reply other threads:[~2006-10-06 13:03 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-17 9:40 The emperor is naked: why *comprehensive* static markup belongs in mainline Karim Yaghmour
2006-09-17 11:21 ` Paul Mundt
2006-09-17 14:36 ` tracepoint maintainance models Ingo Molnar
2006-09-17 15:02 ` Roman Zippel
2006-09-17 15:09 ` Ingo Molnar
2006-09-17 17:18 ` Roman Zippel
2006-09-17 23:27 ` Ingo Molnar
2006-09-17 23:41 ` Ingo Molnar
2006-09-18 0:17 ` Roman Zippel
2006-09-18 9:01 ` Jes Sorensen
2006-09-17 20:37 ` Roman Zippel
2006-09-17 22:34 ` Ingo Molnar
2006-09-17 15:36 ` Mathieu Desnoyers
2006-09-18 0:07 ` Ingo Molnar
2006-09-18 1:12 ` Karim Yaghmour
2006-09-18 1:13 ` Ingo Molnar
2006-09-18 2:32 ` Karim Yaghmour
2006-09-18 2:57 ` Ingo Molnar
2006-09-18 3:54 ` Karim Yaghmour
2006-09-18 4:09 ` Ingo Molnar
2006-09-18 4:43 ` Karim Yaghmour
2006-09-18 2:43 ` Mathieu Desnoyers
2006-09-18 3:21 ` Ingo Molnar
2006-09-18 4:26 ` Mathieu Desnoyers
2006-09-18 5:08 ` Ingo Molnar
2006-09-18 12:25 ` Frank Ch. Eigler
2006-09-18 15:02 ` Ingo Molnar
2006-09-18 15:45 ` Mathieu Desnoyers
2006-09-18 15:48 ` Alan Cox
2006-09-18 15:22 ` Ingo Molnar
2006-09-18 16:19 ` Alan Cox
2006-09-18 16:15 ` Ingo Molnar
2006-09-18 17:02 ` Alan Cox
2006-09-18 16:15 ` Frank Ch. Eigler
2006-09-18 17:02 ` Alan Cox
2006-09-18 17:27 ` Frank Ch. Eigler
2006-09-18 18:04 ` Alan Cox
2006-09-18 17:54 ` Martin Bligh
2006-09-18 18:05 ` Frank Ch. Eigler
2006-09-18 19:10 ` Vara Prasad
2006-09-18 19:49 ` Alan Cox
2006-09-18 19:39 ` Frank Ch. Eigler
2006-09-18 20:28 ` Vara Prasad
2006-10-06 5:33 ` Steven Rostedt
2006-10-06 13:01 ` Frank Ch. Eigler [this message]
2006-10-06 14:23 ` Steven Rostedt
2006-10-06 23:17 ` Jeremy Fitzhardinge
2006-09-18 15:47 ` Frank Ch. Eigler
2006-09-18 15:42 ` Ingo Molnar
2006-09-18 16:30 ` MARKER mechanism, try 2 Mathieu Desnoyers
2006-09-18 16:28 ` Ingo Molnar
2006-09-18 17:47 ` Mathieu Desnoyers
2006-09-18 19:39 ` Alan Cox
2006-09-17 20:19 ` tracepoint maintainance models Nicholas Miell
2006-09-17 23:06 ` Ingo Molnar
2006-09-18 0:05 ` Roman Zippel
2006-09-18 1:52 ` Theodore Tso
2006-09-19 12:58 ` tracing - consensus building insteat of dogfights Christoph Hellwig
2006-09-19 13:25 ` Roman Zippel
2006-09-19 13:45 ` Karim Yaghmour
2006-09-19 14:25 ` Karim Yaghmour
2006-09-18 0:10 ` tracepoint maintainance models Nicholas Miell
2006-09-18 0:43 ` Roman Zippel
2006-09-18 0:56 ` Karim Yaghmour
2006-09-18 0:56 ` Ingo Molnar
2006-09-18 2:09 ` Karim Yaghmour
2006-09-18 3:30 ` Ingo Molnar
2006-09-18 3:52 ` Theodore Tso
2006-09-18 4:11 ` Ingo Molnar
2006-09-18 4:24 ` Karim Yaghmour
2006-09-18 4:32 ` Ingo Molnar
2006-09-18 5:03 ` LTTng and SystemTAP (Everyone who is scared to read this huge thread, skip to here) Mathieu Desnoyers
2006-09-18 15:11 ` Ingo Molnar
2006-09-23 15:50 ` Mathieu Desnoyers
2006-09-18 5:37 ` tracepoint maintainance models Karim Yaghmour
2006-09-18 20:12 ` Michel Dagenais
2006-09-18 4:14 ` Karim Yaghmour
2006-09-18 4:09 ` Ingo Molnar
2006-09-18 4:57 ` Karim Yaghmour
2006-09-18 1:03 ` The emperor is naked: why *comprehensive* static markup belongs in mainline Karim Yaghmour
2006-09-18 15:53 ` Jose R. Santos
2006-09-18 17:28 ` Karim Yaghmour
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