From: Tim Bird <tim.bird@am.sony.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Russell King - ARM Linux" <linux@arm.linux.org.uk>,
"Frederic Weisbecker" <fweisbec@gmail.com>,
"Abhishek Sagar" <sagar.abhishek@gmail.com>,
linux-arm-kernel <linux-arm-kernel@lists.arm.linux.org.uk>,
"linux kernel" <linux-kernel@vger.kernel.org>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Subject: Re: Anyone working on ftrace function graph support on ARM?
Date: Wed, 25 Mar 2009 09:41:13 -0700 [thread overview]
Message-ID: <49CA5EA9.2080106@am.sony.com> (raw)
In-Reply-To: <20090325085418.GA2341@elte.hu>
Ingo Molnar wrote:
> Unwinding is not realistic or desired for the function tracer - it
> runs in every kernel function so performance is paramount.
>
> So, if i understood you correctly, an OABI_COMPAT and FRAME_POINTERS
> dependency has to be added to the ARM HAVE_FUNCTION_GRAPH_TRACER
> Kconfig rule.
This, unfortunately, is a problem for me. All my ARM
projects are now using EABI. If the unwinding looks like
it has too much overhead, I'll do some research on the
-finstrument-functions (__cyg_profile_func_enter/exit) approach.
I'm not sure, however, if it's possible to integrate this with
the dynamic tracing mechanisms, though. So something may have
to give to get this supported on ARM.
-- Tim
=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================
next prev parent reply other threads:[~2009-03-25 16:41 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-24 19:38 Anyone working on ftrace function graph support on ARM? Tim Bird
2009-03-24 20:25 ` Ingo Molnar
2009-03-24 20:48 ` Tim Bird
2009-03-24 20:38 ` Uwe Kleine-König
2009-03-24 21:36 ` Frederic Weisbecker
2009-03-24 21:40 ` Tim Bird
2009-03-24 21:48 ` Ingo Molnar
2009-03-24 21:57 ` Frederic Weisbecker
2009-03-24 22:14 ` Ingo Molnar
2009-03-24 22:54 ` Frederic Weisbecker
2009-03-25 8:36 ` Russell King - ARM Linux
2009-03-25 16:00 ` Steven Rostedt
2009-03-25 17:13 ` Frederic Weisbecker
2009-03-25 20:27 ` [PATCH][GIT PULL] x86, function-graph: only save return values on x86_64 Steven Rostedt
2009-03-25 20:45 ` Jaswinder Singh Rajput
2009-03-25 21:26 ` Steven Rostedt
2009-04-08 16:09 ` Ingo Molnar
2009-04-08 16:37 ` Steven Rostedt
2009-04-08 16:41 ` Ingo Molnar
2009-04-08 17:40 ` Frederic Weisbecker
2009-03-24 22:29 ` Anyone working on ftrace function graph support on ARM? Abhishek Sagar
2009-03-24 22:48 ` Frederic Weisbecker
2009-03-25 8:42 ` Russell King - ARM Linux
2009-03-25 8:54 ` Ingo Molnar
2009-03-25 9:57 ` Russell King - ARM Linux
2009-03-25 10:45 ` Uwe Kleine-König
2009-03-25 11:21 ` Russell King - ARM Linux
2009-03-25 12:09 ` Uwe Kleine-König
2009-03-25 16:41 ` Tim Bird [this message]
2009-03-25 11:41 ` Frederic Weisbecker
2009-03-25 16:34 ` Tim Bird
2009-03-25 17:05 ` Uwe Kleine-König
2009-03-25 17:17 ` Russell King - ARM Linux
2009-03-25 18:37 ` Tim Bird
2009-03-25 18:41 ` Steven Rostedt
2009-03-27 12:58 ` Catalin Marinas
2009-04-09 15:29 ` Daniel Jacobowitz
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