linux-kernel - Re: [Patch] Tracing/ftrace: Adds a marker to allow user comments

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Date:	Mon, 25 Aug 2008 12:38:42 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frédéric Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [Patch] Tracing/ftrace: Adds a marker to allow user comments



On Mon, 25 Aug 2008, Fr?d?ric Weisbecker wrote:

> 2008/8/25 Ingo Molnar <mingo@...e.hu>:
> >
> > * Fr?d?ric Weisbecker <fweisbec@...il.com> wrote:
> >
> >> The documentation of mmiotrace describes an unimplemented feature
> >> which allows the user to write any comments on his trace by writing on
> >> a tracing/marker file. Here is an implementation of this idea.
> >>
> >> It applies on last version of tip tree.
> >
> > hmm ... have you looked at the (recently implemented) ftrace_printk()
> > facility?
> >
> >        Ingo
> >
> 
> Yes but I didn't want to use ftrace_printk() because it needs the "ip"
> parameter. User messages doesn't need this. But I reuse a part of the
> code of ftrace_printk and I splitted ftrace_printk() in two parts for
> this purpose: __ftrace_printk() and trace_print().
> I also reused the print_entry but with a new TRACE_MARK type to make
> the difference when it is time to send the entry to the pipe because
> user messages don't use ip.


Feel free to make TRACE_CONT work for you. I coupled it a little more than 
I wanted to with the ftrace print. If you can find a nice way to make 
TRACE_CONT a bit more generic, then feel free.

-- Steve

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