linux-kernel - Re: [tip:timers/tracing] hrtimer: Add tracepoint for hrtimers

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Message-Id: <1255460174.7113.2115.camel@gandalf.stny.rr.com>
Date:	Tue, 13 Oct 2009 14:56:14 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	mingo@...hat.com, hpa@...or.com, mathieu.desnoyers@...ymtl.ca,
	anton@...ba.org, linux-kernel@...r.kernel.org,
	peterz@...radead.org, zhaolei@...fujitsu.com,
	xiaoguangrong@...fujitsu.com, fweisbec@...il.com,
	tglx@...utronix.de, kosaki.motohiro@...fujitsu.com,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:timers/tracing] hrtimer: Add tracepoint for hrtimers

On Tue, 2009-10-13 at 20:41 +0200, Ingo Molnar wrote:

> > But still, we need to build a way to convert big endian to little, as 
> > well as perhaps converting 32bit to 64 bit longs. As well as vice 
> > versa.
> 
> Exporting the print line as C in a convenient way does not in any way 
> make it more difficult to define endianness and bit size - we have to do 
> that anyway. It's largely orthogonal.

The way I do it now, is basically making a C interpreter. This can
easily handle word size and endianess (I have those exported too, and
can handle differences between host and file).

But to export the "printf" as a C function, that C function will need to
know a way what size a long is, as well as how to convert endianess.

I'm not really sure how to go about doing something like this
automatically. Every event will need its own C function to convert.
Sounds more like what Mathieu was describing.

We still don't have a way to handle enums and structures (like ktime).

-- Steve

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