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Date: Mon, 11 Feb 2008 19:36:38 -0500 (EST) From: Steven Rostedt <rostedt@...dmis.org> To: Jan Engelhardt <jengelh@...putergmbh.de> cc: Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@....com.au> Subject: Re: [10/19] ftrace: add basic support for gcc profiler instrumentation On Sun, 10 Feb 2008, Jan Engelhardt wrote: > > 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. > It is, but is hidden in the Kconfig. I moved it to Kconfig as it was recommended to me because it is cleaner to do it there. Two patches later: +config FTRACE + bool "Kernel Function Tracer" + depends on DEBUG_KERNEL && HAVE_FTRACE + select FRAME_POINTER -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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