linux-kernel - Re: [PATCH] gpio: add trace events for setting direction and value

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Message-ID: <20110218095803.GY22310@pengutronix.de>
Date:	Fri, 18 Feb 2011 10:58:03 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Steven Rostedt <srostedt@...hat.com>,
	Grant Likely <grant.likely@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>
Subject: Re: [PATCH] gpio: add trace events for setting direction and value

Hi Steven, hi Grant,

On Wed, Feb 16, 2011 at 12:12:51PM -0500, Steven Rostedt wrote:
> Note: to save the memory footprint of these tracepoints, you can use
> DEFINE_EVENT_PRINT(). You can see the usage for this in the
> include/trace/events/kmem.h.
> But to do this, you will need to have a single TP_STRUCT__entry() for
> both. Not sure if this is what you want.
> 
> 	TP_STRUCT__entry(
> 		__field(unsigned, gpiq)
> 		__field(int, get_in)
> 		__field(int, value_err)
> 
> ??
> 
> Just a suggestion, but may not be worth it.
Yeah, I saw that, still I think it's sane to keep them seperated.
Or how much would we save?  Can you estimate that?

@Grant: Steven told me this should go via your tree, so if you are OK
with the change, feel free to take it.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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