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

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Date:	Fri, 22 Aug 2014 18:46:44 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Alexandre Montplaisir <alexmonthy@...populi.im>
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 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@...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.

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

thanks,
jirka
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