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Message-ID: <53F65075.9050503@voxpopuli.im>
Date: Thu, 21 Aug 2014 16:03:01 -0400
From: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
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To: Jiri Olsa <jolsa@redhat.com>
CC: linux-kernel@vger.kernel.org,
        Dominique Toupin <dominique.toupin@ericsson.com>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Tom Zanussi <tzanussi@gmail.com>,
        Jeremie Galarneau <jgalar@efficios.com>,
        David Ahern <dsahern@gmail.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: FW: [RFC 0/5] perf tools: Add perf data CTF conversion
References: <53F38C74.4030300@voxpopuli.im> <20140820092858.GA1203@krava.brq.redhat.com> <53F4F38C.4080407@voxpopuli.im> <20140821165841.GA32088@krava.brq.redhat.com>
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On 08/21/2014 12:58 PM, Jiri Olsa wrote:
> hum, I've got nothing from babeltrace:
>
> [jolsa@krava ~]$ su
> Password:
> [root@krava jolsa]# lttng create perf
> Spawning a session daemon
> Session perf created.
> Traces will be written in /root/lttng-traces/perf-20140821-184956
> [root@krava 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@krava jolsa]# lttng start
> Tracing started for session perf
> [root@krava jolsa]# lttng stop
> Waiting for data availability.
> Tracing stopped for session perf
> [root@krava jolsa]# lttng destroy
> Session perf destroyed
> [root@krava jolsa]# babeltrace ~/lttng-traces/perf-20140821-184956/
> [root@krava jolsa]# babeltrace ~/lttng-traces/perf-20140821-184956/kernel/
> [root@krava jolsa]#
>
> and empty view in eclipse
>
> thanks,
> jirka