linux-kernel - Re: [RFC] ftrace: support tracing functions in one module

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Message-ID: <863e9df20808030816w3ace806cwb577f81deb2633f3@mail.gmail.com>
Date:	Sun, 3 Aug 2008 20:46:42 +0530
From:	"Abhishek Sagar" <sagar.abhishek@...il.com>
To:	"Ming Lei" <tom.leiming@...il.com>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Steven Rostedt" <srostedt@...hat.com>
Subject: Re: [RFC] ftrace: support tracing functions in one module

On Sun, Aug 3, 2008 at 1:20 PM, Ming Lei <tom.leiming@...il.com> wrote:
> Could you add the support of tracing functions in one module only to ftrace?

You can do that at compile time only by selective compilation of
files/modules which need to be traced with the -pg CFLAG. For
instance, the inlined patch enables tracing of all functions in
softirq.o only.

Regards,
Abhishek Sagar

--
## For testing only

diff --git a/Makefile b/Makefile
index 40f2481..09d216b 100644
--- a/Makefile
+++ b/Makefile
@@ -532,10 +532,6 @@ KBUILD_CFLAGS      += -g
 KBUILD_AFLAGS  += -gdwarf-2
 endif

-ifdef CONFIG_FTRACE
-KBUILD_CFLAGS  += -pg
-endif
-
 # We trigger additional mismatches with less inlining
 ifdef CONFIG_DEBUG_SECTION_MISMATCH
 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
diff --git a/kernel/Makefile b/kernel/Makefile
index 82f1f3f..c099be3 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -14,14 +14,8 @@ obj-y     = sched.o fork.o exec_domain.o panic.o printk.o \
 CFLAGS_REMOVE_sched.o = -mno-spe

 ifdef CONFIG_FTRACE
-# Do not trace debug files and internal ftrace files
-CFLAGS_REMOVE_lockdep.o = -pg
-CFLAGS_REMOVE_lockdep_proc.o = -pg
-CFLAGS_REMOVE_mutex-debug.o = -pg
-CFLAGS_REMOVE_rtmutex-debug.o = -pg
-CFLAGS_REMOVE_cgroup-debug.o = -pg
-CFLAGS_REMOVE_sched_clock.o = -pg
-CFLAGS_REMOVE_sched.o = -mno-spe -pg
+CFLAGS_softirq.o = -pg
+CFLAGS_REMOVE_sched.o = -mno-spe
 endif

 obj-$(CONFIG_PROFILING) += profile.o
--
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