linux-kernel - Re: [PATCH 2/2] tracing/function-graph-tracer: improve duration output

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Date:	Wed, 3 Dec 2008 15:22:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Tim Bird <tim.bird@...sony.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] tracing/function-graph-tracer: improve duration
	output


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

> 2008/12/3 Steven Rostedt <rostedt@...dmis.org>:
> > Actually, I was also thinking of keeping the CPU number in front:
> >
> >  ------------------------------------------
> >  0)    cat-2796    =>   events/-9
> >  ------------------------------------------
> >
> > This way we can easily grep for a common CPU and still get the context
> > switches:
> >
> > grep '^0)' trace > /tmp/trace0
> 
> I agree. More easy to grep. Ingo, Peter, others, what do you think?

sure.

> > Of course it will probably also work without the '^' now, but then it 
> > might grab ftrace_printks with a '0)' if we add those.
> 
> 
> I proposed a solution for ftrace_printk (which I planned to implement 
> this evening). Since we are in a C-style output, that would be good to 
> put the ftrace_printk as /* C comments */ inside just below the 
> function that called it. Like this:
> 
> func_that_called_ftrace_printk {
>     /* Message from ftrace_printk */
> }
> 
> This way we keep the idea of comment which comes along the role of
> ftrace_printk and we know
> which function called it, at which depth.....
> 
> Do you like it this way?

yeah, that would be lovely to have too.

	Ingo
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