linux-kernel - Re: [PATCH 0/7][RFC] function graph tracer port to PowerPC

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Message-Id: <1234405406.8142.4.camel@localhost>
Date:	Thu, 12 Feb 2009 13:23:26 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/7][RFC] function graph tracer port to PowerPC

On Wed, 2009-02-11 at 20:10 -0500, Steven Rostedt wrote:
> The following set of patches are RFC and not for inclusion
> (unless everyone is fine with them as is).
> 
> This is the port to PowerPC of the function graph tracer that was written
> by Frederic Weisbecker for the x86 architecture.  It is broken up
> into a series of logical steps.
> 
> 1) get generic code ready for other archs
> 2) get PowerPC 64-bit working with just static function tracing
> 3) get PowerPC 64-bit working with dynamic function tracing
> 4) get PowerPC 32-bit working with just static function tracing
> 5) get PowerPC 32-bit working with dynamic function tracing
> 
> (with some clean ups in between)
> 
> 
> The function graph tracer not only traces the start of a function
> (uses the function tracer part for that) but also uses the kprobes
> trick to replace the return address with a hook to trace the exit
> of the function.

You use the "kprobes trick", but none of the kprobes code (AFAICS).
Couldn't there be some common code between the two?

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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