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

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Date:	Mon, 8 Dec 2008 16:50:18 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frédéric 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


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

> 2008/12/8 Ingo Molnar <mingo@...e.hu>:
> >
> > * 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!
> 
> Thanks!
> 
> > [ 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. ]
> 
> 
> Ok. BTW. I wanted to give a try on linux-next to test the last ftrace 
> stuffs, but the auto-ftrace-next branch seems too much old. Are the 
> auto branches updated every week or something like this...?

yes - but there's a few pending regressions right now delaying the 
reintegration.

	Ingo
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