linux-kernel - Re: [RFC][PATCH 00/10] tracing: Use TRACE_DEFINE

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Message-ID: <20150331092643.47b59505@gandalf.local.home>
Date:	Tue, 31 Mar 2015 09:26:43 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [RFC][PATCH 00/10] tracing: Use TRACE_DEFINE_ENUM() to show
 enum values

On Tue, 31 Mar 2015 16:36:51 +0900
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> > Instead of adding an enum mapping file, I could add a way to look at
> > all the events in the system that defined a mapping, and do a
> > "s/ENUM_NAME/ENUM_VALUE/g" do the saved print formats? I'm not sure how
> > much we want to do that in the kernel though.
> 
> No, it's not what I expected...

Actually, I'm going to play with this idea and see how crazy it is or
isn't. Converting the ENUMS in TP_printk() might actually be doable.

I'll write up some code and we can see if it seems sane or not. OK?


> 
> What I thought was expanding __print_symbolic() macro in TP_printk
> with a special hash string(start with #), and when showing it via
> event/format, replace the hash string with the strings generated
> by the map of symbols. This will introduce a small overhead to show
> the format as a side effect.
> 
> Actually I even have not tried, so it's just an idea yet.
> 

If you can figure something out, please let me know!

Thanks,

-- Steve
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