linux-kernel - Re: [10/19] ftrace: add basic support for gcc profiler instrumentation

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Date:	Sun, 10 Feb 2008 13:18:09 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@....com.au>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [10/19] ftrace: add basic support for gcc profiler instrumentation


On Feb 10 2008 08:20, Ingo Molnar wrote:
>--- linux.orig/Makefile
>+++ linux/Makefile
>@@ -509,6 +509,9 @@ endif
> 
> include $(srctree)/arch/$(SRCARCH)/Makefile
> 
>+ifdef CONFIG_FTRACE
>+KBUILD_CFLAGS	+= -pg
>+endif
> ifdef CONFIG_FRAME_POINTER
> KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
> else

You should use -fno-omit-frame-pointer when building with -pg; As far
as I can remember from using gprof in the past (in userspace, I might
add), the output does not make much sense without frame boundaries.
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