linux-kernel - Re: [PATCH 1/3] tracing/function-graph-tracer: introduce __notrace

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Message-ID: <20081208141406.GA14856@elte.hu>
Date:	Mon, 8 Dec 2008 15:14:06 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] tracing/function-graph-tracer: introduce
	__notrace_funcgraph to filter special functions


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

> Impact: trace more functions
> 
> When the function graph tracer is configured, three more files are not 
> traced to prevent only four functions to be traced. And this impacts 
> the normal function tracer too.
> 
> arch/x86/kernel/process_64/32.c:
> 
> I had crashes when I let this file traced. After some debugging, I saw 
> that the "current" task point was changed inside__swtich_to(), ie: 
> "write_pda(pcurrent, next_p);" inside process_64.c Since the tracer 
> store the original return address of the function inside current, we 
> had crashes. Only __switch_to() has to be traced.
> 
> kernel/module.c and kernel/extable.c:
> 
> Because of a function used internally by the function graph tracer: 
> __kernel_text_address()
> 
> To let the other functions inside these files to be traced, this patch 
> introduces the __notrace_funcgraph function prefix which is __notrace 
> if function graph tracer is configured and nothing if not.
> 
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>

applied to tip/tracing/function-graph-tracer, thanks Frederic!

[ one small request: would it be possible to include the diffstat in the 
  patches you send? If you use git-diff then it's the --patch-with-stat 
  option. ]

	Ingo
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