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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
=============================


  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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