linux-kernel - [HELP] How to use ftrace to learn how a function is ivoked?

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Date:	Thu, 3 Apr 2014 06:36:57 +0000
From:	"Du, ChangbinX" <changbinx.du@...el.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [HELP] How to use ftrace to learn how a function is ivoked?

Hi, All,
I have a question for ftrace usage. It is that if I have a function A, then I want to 
know how function A is ivoked?
I know ftrace can show me what sub-functions that A called by below steps:
	# echo function_graph > current_tracer
　　# echo function_A > set_graph_function
	# cat trace
Then a call stack will show what functions A has called. But sometimes I want to 
know how A is called. Is there a method to do this? Please help me!

Regards and Thanks!
Du, Changbin