linux-kernel - Re: Perf record format portability

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Message-ID: <20120516180830.GH7864@infradead.org>
Date:	Wed, 16 May 2012 15:08:30 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Dmitry Antipov <dmitry.antipov@...aro.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: Perf record format portability

Em Wed, May 16, 2012 at 12:58:23PM -0400, Steven Rostedt escreveu:
> On Wed, 2012-05-16 at 11:59 -0300, Arnaldo Carvalho de Melo wrote:
> > 	Was the kernel trace events infrastructure designed with that in
> > mind? I.e. cross analysis? I must be missing something here, still
> > ENOCOFFEE :-\
> 
> Yes, the libparsevents library was design for this from day one. That's
> why trace-cmd data file can be run on an ARM and read on x86, or PPC, or
> whatever. I did all my development testing against 32bit, 64bit and big
> and little endian. This was the case from the beginning.

I need to look at the code, but how does it do this? Copy the relevant
/sys/kernel/debug/events formats in the header and then instead of
looking at /sys/... look at those?

Does it still copy /proc/kallsyms?

- Arnaldo
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