linux-kernel - Re: [PATCH] perf sched replay: fix event lookup

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Date:	Wed, 27 Jun 2012 13:18:17 +0400
From:	Dmitry Antipov <dmitry.antipov@...aro.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH] perf sched replay: fix event lookup

On 06/26/2012 03:20 AM, Arnaldo Carvalho de Melo wrote:
>
>> Fair enough. The method should be a simple wrapper to libtraceevent APIs
>> like this patch.
>
> The pevent thing is per perf.data file, so I made it stop being static
> and become a perf_session member, so tools processing perf.data files
> use perf_session and _there_ we read the event into session->pevent and
> then have to change everywhere to stop using that single global pevent
> variable and use the per session one.
>
> Dmitry, can you test the attached patch to check if it solves the
> problems you reported?

This looks good and works for my x86 <-> ARM tests.

> Note that it _doesn't_ fall backs to trace__event_id, as we're not
> interested at all in what is present in the
> /sys/kernel/debug/tracing/events in the workstation doing the analysis,
> just in what is in the perf.data file.

Agree.

Dmitry
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