From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752454AbbEDUDI (ORCPT <rfc822;w@1wt.eu>);
	Mon, 4 May 2015 16:03:08 -0400
Received: from mx1.redhat.com ([209.132.183.28]:59487 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1752402AbbEDUDC (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Mon, 4 May 2015 16:03:02 -0400
Date: Mon, 4 May 2015 22:02:16 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org,
        David Ahern <dsahern@gmail.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Namhyung Kim <namhyung@gmail.com>,
        Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH V4 02/24] perf tools: Add AUX area tracing index
Message-ID: <20150504200216.GF11223@krava>
References: <1430404667-10593-1-git-send-email-adrian.hunter@intel.com>
 <1430404667-10593-3-git-send-email-adrian.hunter@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1430404667-10593-3-git-send-email-adrian.hunter@intel.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, Apr 30, 2015 at 05:37:25PM +0300, Adrian Hunter wrote:
> Add an index of AUX area tracing events within
> a perf.data file.
> 
> perf record uses a special user event
> PERF_RECORD_FINISHED_ROUND to enable sorting of
> events in chunks instead of having to sort all
> events altogether.
> 
> AUX area tracing events contain data that can
> span back to the very beginning of the recording
> period. i.e. they do not obey the rules of
> PERF_RECORD_FINISHED_ROUND.
> 
> By adding an index, AUX area tracing events
> can be found in advance and the
> PERF_RECORD_FINISHED_ROUND approach works as
> usual.
> 
> The index is recorded with the auxtrace feature
> in the perf.data file.  A session reads the index
> but does not process it.  An AUX area
> decoder can queue all the AUX area data
> in advance using auxtrace_queues__process_index()
> or otherwise process the index in some custom
> manner.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

Acked-by: Jiri Olsa <jolsa@kernel.org>

thanks,
jirka