linux-kernel - Re: [PATCH 5/5][RESEND] tracing/function-graph-tracer: drop the kernel_text

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Message-ID: <20090209095343.GE14402@elte.hu>
Date:	Mon, 9 Feb 2009 10:53:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/5][RESEND] tracing/function-graph-tracer: drop the
	kernel_text_address check


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> When the function graph tracer picks a return address, it ensures this address
> is really a kernel text one by calling __kernel_text_address()
> Actually this path has never been taken. Its role was more likely to debug the tracer
> on the beginning of its development but this function is wasteful since it is called
> for every traced function.
> 
> The fault check is already sufficient.
> 
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> ---
>  arch/x86/kernel/ftrace.c |    7 -------
>  kernel/extable.c         |    4 ++--
>  kernel/module.c          |    2 +-
>  3 files changed, 3 insertions(+), 10 deletions(-)

Applied to tip/tracing/ftrace, thanks Frederic!

	Ingo
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