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

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Message-ID: <20120611140852.GB2202@infradead.org>
Date:	Mon, 11 Jun 2012 11:08:52 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...il.com>
Cc:	Dmitry Antipov <dmitry.antipov@...aro.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,
	patches@...aro.org
Subject: Re: [PATCH] perf sched replay: fix event lookup

Em Mon, Jun 11, 2012 at 02:46:02PM +0900, Namhyung Kim escreveu:
> On Sat,  9 Jun 2012 13:05:58 +0400, Dmitry Antipov wrote:
> > Use new function trace_find_event_by_name to lookup events before
> > looking through /sys files. This helps 'perf sched replay' to map
> > event names to IDs correctly when processing perf.data recorded
> > on another machine.
> 
> Basically the same approach with the previous reply, please put this
> into trace_event__id(). And minor nits below..

Well, trace_event__id() is private to evlist and evlist so far is a
local thing, i.e. it doesn't know anything about perf.data files.

So I think we should have a per perf.data (perf_session) method that
knows that it shouldn't look _at all_ to /sys, but just at what came in
the perf.data file.

As well when we want something that is on the running machine, even if
we're dealing somehow with a perf.data file, we shouldn't use what is in
it.

- Arnaldo
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