linux-kernel - Re: Perf record format portability

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Message-ID: <1337187503.6724.50.camel@gandalf.stny.rr.com>
Date:	Wed, 16 May 2012 12:58:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
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

On Wed, 2012-05-16 at 11:59 -0300, Arnaldo Carvalho de Melo wrote:

> Steve,
> 
> 	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.

-- Steve

> 
> 	When doing cross arch event analisys I tested:
> 
>         PERF_TYPE_HARDWARE                      = 0,
>         PERF_TYPE_SOFTWARE                      = 1,
>         PERF_TYPE_HW_CACHE                      = 3,
> 
> Not:
> 
>         PERF_TYPE_TRACEPOINT                    = 2,
>         PERF_TYPE_RAW                           = 4,
>         PERF_TYPE_BREAKPOINT                    = 5,
> 
> - Arnaldo


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