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From: "Iram Shahzad" <iram.shahzad@jp.fujitsu.com>
To: "Tim Bird" <tim.bird@am.sony.com>
Cc: <linux-kernel@vger.kernel.org>
References: <06EE497F774E482693005209CB740D6A@rainbow> <4BFB0C77.2030904@am.sony.com>
Subject: Re: FUNCTION_TRACER: can it be used to trace early bootup functions
Date: Tue, 25 May 2010 09:58:44 +0900
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Tim

Many thanks for the information. I am sorry I did not mention
that my purpose this time is to know the calling sequence of the
functions rather than to measure the timings.
Anyway the information is useful to me.

It seems there is another tracing mechanism called KFT.
http://elinux.org/Kernel_Function_Trace
>>From the examples in the above URL, it looks like it can
start tracing from start_kernel.
But it seems it is neither mainlined nor actively maintained.
Any idea about its status?

Thanks
Iram