linux-kernel - Re: [PATCH 02/23] perf tools: Remove data

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Message-ID: <20130718124601.GC1092@krava.brq.redhat.com>
Date:	Thu, 18 Jul 2013 14:46:01 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 02/23] perf tools: Remove data_offset seek as it's not
 needed

On Thu, Jul 18, 2013 at 04:27:47PM +0900, Namhyung Kim wrote:
> On Wed, 17 Jul 2013 19:49:42 +0200, Jiri Olsa wrote:
> > Removing data_offset seek as it's not needed, because
> > data are not read by syscall but mmaped instead.
> 
> Yes we do, but it's not mandatory, right?  I'd rather expect the file
> offset remains at the beginning of data after calling
> perf_session__read_header() instead of a random point (EOF?).

well it's just useless, and I think it's better and more clear
to set it properly before the reading anyway. Also AFAICS there's
no other read after this seek even later.

jirka
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