linux-kernel - Re: [RFC] x86: entry_64 - introduce FTRACE

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Date:	Sat, 13 Dec 2008 18:16:00 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander van Heukelum <heukelum@...tmail.fm>
Subject: Re: [RFC] x86: entry_64 - introduce FTRACE_ frame macro

[Frédéric Weisbecker - Sat, Dec 13, 2008 at 03:46:03PM +0100]
| 2008/12/13 Cyrill Gorcunov <gorcunov@...il.com>:
| > [Steven Rostedt - Fri, Dec 12, 2008 at 04:56:47PM -0500]
| > ...
| > | > Steve, here is how it could look like:
| > | > (I liked first proposal more :)
| > |
| > | I see the confusion. In ftrace.h the function graph tracer config is not
| > | inside CONFIG_FUNCTION_TRACER, even though it is dependent on it (or
| > | was). OK, just do your first proposal then.
| > |
| > | -- Steve
| > |
| >
| > ok, I sent it yesterday as
| >
| >        http://lkml.org/lkml/2008/12/12/301
| >        [PATCH] x86: entry_64 - introduce FTRACE_ frame macro v2
| >
| > Ingo, will you pick it up?
| >
| >                - Cyrill -
| >
| 
| Hi,
| 
| Looks good and clarify the asm bits.
| 
| I wonder if the function_graph_tracer should continue to necessarily
| depend on the function tracer.
| It was more simplier to do so but perhaps that could be avoided with
| small modifications.
| 

Hi Frédéric,

I didn't play with tracer internals since was more concerned about
asm part of code. If you find that we better should introduce
additional deps here or change a "deps graph" itself - I think it
will be easy to place a new patch on top of this (or replace my
patch) :)

The only thing I would change in mine patch is -- subq/addq $0x38, %rsp
since the following code uses decimal system but not a big deal anyway.

		- Cyrill -
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