linux-kernel - Re: [PATCH V4 02/24] perf tools: Add AUX area tracing index

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Message-ID: <20150504200216.GF11223@krava>
Date:	Mon, 4 May 2015 22:02:16 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH V4 02/24] perf tools: Add AUX area tracing index

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@...el.com>

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

thanks,
jirka
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