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Date: Fri, 22 Aug 2014 18:46:44 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: Alexandre Montplaisir <alexmonthy@voxpopuli.im>
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
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On Thu, Aug 21, 2014 at 04:03:01PM -0400, Alexandre Montplaisir wrote:
> 
> 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.

ugh ;-) 'perf:cpu:cycles' already sounded like event to me.. will try

thanks,
jirka