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

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Message-ID: <20110302220305.GB22854@angua.secretlab.ca>
Date:	Wed, 2 Mar 2011 15:03:05 -0700
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Steven Rostedt <srostedt@...hat.com>
Cc:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>
Subject: Re: [PATCH] gpio: add trace events for setting direction and value

On Fri, Feb 18, 2011 at 10:48:06AM -0500, Steven Rostedt wrote:
> On Fri, 2011-02-18 at 10:58 +0100, Uwe Kleine-König wrote:
> > 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?
> 
> You can do it :)   Especially since it can vary by archs.
> 
> Just compile the kernel once this way, and then try it with
> DEFINE_EVENT_PRINT(), compile the kernel and run size on the two.
> 
> Then you can see the difference it makes. It may end up not being worth
> the difference. But as embedded uses gpio the most, I'll leave that up
> to you.

Uwe, any update on this?  Are you going to spin a new patch, or should
I take this one?

g.
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