linux-kernel - Re: FW: [RFC 0/5] perf tools: Add perf data CTF conversion

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Date:	Thu, 21 Aug 2014 16:03:01 -0400
From:	Alexandre Montplaisir <alexmonthy@...populi.im>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Dominique Toupin <dominique.toupin@...csson.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Tom Zanussi <tzanussi@...il.com>,
	Jeremie Galarneau <jgalar@...icios.com>,
	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: FW: [RFC 0/5] perf tools: Add perf data CTF conversion


On 08/21/2014 12:58 PM, Jiri Olsa wrote:
> hum, I've got nothing from babeltrace:
>
> [jolsa@...va ~]$ su
> Password:
> [root@...va jolsa]# lttng create perf
> Spawning a session daemon
> Session perf created.
> Traces will be written in /root/lttng-traces/perf-20140821-184956
> [root@...va jolsa]# lttng add-context -k -t prio -t perf:cpu:cycles

Oh I see the problem, you don't have any events enabled! In LTTng terms, 
a "context" is a piece of information that gets attached to every event. 
But if you don't have any event at all, you're not gonna see much 
context information. ;)

Try adding a
# lttng enable-event -a -k
before starting the session. This should give you some output in the 
viewers.


Cheers,
Alexandre


> kernel context prio added to all channels
> kernel context perf:cpu:cycles added to all channels
> [root@...va jolsa]# lttng start
> Tracing started for session perf
> [root@...va jolsa]# lttng stop
> Waiting for data availability.
> Tracing stopped for session perf
> [root@...va jolsa]# lttng destroy
> Session perf destroyed
> [root@...va jolsa]# babeltrace ~/lttng-traces/perf-20140821-184956/
> [root@...va jolsa]# babeltrace ~/lttng-traces/perf-20140821-184956/kernel/
> [root@...va jolsa]#
>
> and empty view in eclipse
>
> thanks,
> jirka

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