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From: "Frank Ch. Eigler" <fche@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Frank Ch. Eigler" <fche@redhat.com>,
	Mathieu Desnoyers <compudj@krystal.dyndns.org>,
	Martin Bligh <mbligh@google.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	prasanna@in.ibm.com, Andrew Morton <akpm@osdl.org>,
	Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>,
	Paul Mundt <lethal@linux-sh.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Jes Sorensen <jes@sgi.com>, 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>,
	ltt-dev@shafik.org, systemtap@sources.redhat.com,
	Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management)
Date: Mon, 25 Sep 2006 13:45:25 -0400	[thread overview]
Message-ID: <20060925174525.GF25296@redhat.com> (raw)
In-Reply-To: <20060921185029.GB12048@elte.hu>

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Hi -

On Thu, Sep 21, 2006 at 08:50:29PM +0200, Ingo Molnar wrote:

> [...]  let me qualify that: parameters must be prepared there too -
> but no actual function call inserted. (at most a NOP
> inserted). [...]  Does a simple asm() that takes read-only
> parameters but only adds a NOP achieve this result?

You mean something like this?

#define MARK(n,v1,v2,v3) asm ("__mark_" #n ": nop" ::  \
                              "X" (v1), "X" (v2), "X" (v3))

I haven't been able to get gcc to emit any better debuginfo for
parameters pseudo-passed like this. 

(I've tested such a marker inserted into an inner loop of dhrystone.
It was compiled with "-ggdb -O3".  Neither gdb nor systemtap could
resolve the same values/symbols being passed as MARK() arguments,
though at least the breakpoint address was nicely marked.)

- FChE

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  parent reply	other threads:[~2006-09-25 17:48 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-21 16:00 [PATCH] Linux Kernel Markers 0.5 for Linux 2.6.17 (with probe management) Mathieu Desnoyers
2006-09-21 16:06 ` Ingo Molnar
2006-09-21 21:42   ` Mathieu Desnoyers
2006-09-21 21:49     ` Mathieu Desnoyers
2006-09-22  6:29     ` Karim Yaghmour
2006-09-22  6:49     ` Ingo Molnar
2006-09-22 14:03       ` Mathieu Desnoyers
2006-09-22 16:53         ` Ingo Molnar
2006-09-22 17:11           ` Mathieu Desnoyers
2006-09-22 17:12             ` Ingo Molnar
2006-09-22 17:28               ` Mathieu Desnoyers
2006-09-22  7:07     ` Ingo Molnar
2006-09-22  8:14       ` Karim Yaghmour
2006-09-22 15:08       ` Mathieu Desnoyers
2006-09-22 16:24         ` Karim Yaghmour
2006-09-22 16:13           ` Mathieu Desnoyers
2006-09-22 17:03             ` Karim Yaghmour
2006-09-22 18:06               ` Mathieu Desnoyers
2006-09-22 19:24                 ` Karim Yaghmour
2006-09-22 16:45         ` Ingo Molnar
2006-09-22 14:31     ` Christoph Hellwig
2006-09-23 16:51   ` Mathieu Desnoyers
2006-09-21 17:56 ` Frank Ch. Eigler
2006-09-21 18:50   ` Ingo Molnar
2006-09-21 19:54     ` Jeremy Fitzhardinge
2006-09-25 17:45     ` Frank Ch. Eigler [this message]
2006-09-21 20:59   ` Mathieu Desnoyers

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