linux-kernel - Re: Perf record format portability

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Message-ID: <20120516174825.GA11516@m.brq.redhat.com>
Date:	Wed, 16 May 2012 19:48:25 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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
Subject: Re: Perf record format portability

On Wed, May 16, 2012 at 12:58:23PM -0400, Steven Rostedt wrote:
> 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.

for ppc64(record) vs x86_64(report) I got following report on latest tip:

[jolsa@...p-26-214 test]$ ../perf report > report.target
Endianness of raw data not corrected!
Warning:
718 samples with id not present in the header
Warning:
The perf.data file has no samples!

for following record:
perf record -a -e sched:sched_switch -e sched:sched_process_exit -e sched:sched_process_fork -e sched:sched_wakeup -- sleep 10
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.178 MB perf.data (~7781 samples) ]

I haven't tried trace-cmd, but I guess let's wait for libparsevents
perf integration then.. ;)

jirka
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