linux-kernel - Re: [PATCH 2/7] perf data: Switch to multiple cpu stream files

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Date:	Mon, 20 Apr 2015 22:19:44 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...nel.org>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	He Kuang <hekuang@...wei.com>, Ingo Molnar <mingo@...nel.org>,
	Jeremie Galarneau <jgalar@...icios.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tom Zanussi <tzanussi@...il.com>,
	Wang Nan <wangnan0@...wei.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] perf data: Switch to multiple cpu stream files

On Mon, Apr 20, 2015 at 04:58:54PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sat, Apr 18, 2015 at 05:50:15PM +0200, Jiri Olsa escreveu:
> > From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> > 
> > Currently we store the data into single data strea/file. The cpu
> > if data is stored within the event sample. The lttng puts the CPU
> > number that belongs to the event into the packet context instead
> > into the event.
> > 
> > This patch makes sure that the trace produce by perf does look the
> > same way. We now use one stream per-CPU. Having it all in one stream
> > increased the total size of the resulting file. The test went from
> > 416KiB (with perf_cpu event member) to 24MiB due to the required
> > (and pointless) flush. With the per-cpu streams the total size went
> > up to 588KiB.
> > 
> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> > Link: http://lkml.kernel.org/n/tip-fco07vxi6yx4m9et2aimm4u0@git.kernel.org
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> 
> With latest babeltrace.git:
> 
> [acme@zoo babeltrace]$ git log --oneline | head -1
> 48d711a204f6 Fix: Missing stdint.h in stream-class.h

hum, this is rather old one (Mar 10th), current is:

[jolsa@...va babeltrace]$ git show --oneline | head -1
d8f190b24d52 Add tests for bt_ctf_field_string_append_len()

jirka
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