[lttng-dev] Lttng state dump traces not present in 13.04 Ubuntu server distribution

[Mathieu Desnoyers]

There are a few things to double-check: 

- that the module holding the statedump event does not taint the kernel (is it signed ?) 
- that there is no conflict between the lttng-modules from Ubuntu and the one you are using, 

Also, I fixed TRACE_EVENT_MAP type of event declaration recently, but I don't think 
it is related to your issue. This is only for the cases where the event name differs between the 
Linux kernel tracepoint and the LTTng name. 

Thanks, 

Mathieu 

----- Original Message -----

> From: "Krishanth TJ" <krishanthtj at gmail.com>
> To: "Alexandre Montplaisir" <alexmonthy at voxpopuli.im>
> Cc: lttng-dev at lists.lttng.org
> Sent: Monday, January 27, 2014 1:00:44 AM
> Subject: Re: [lttng-dev] Lttng state dump traces not present in 13.04 Ubuntu
> server distribution

> Yes, they do appear in "lttng list -k" event list.

> Regards,
> Krish.

> On Fri, Jan 24, 2014 at 11:47 PM, Alexandre Montplaisir <
> alexmonthy at voxpopuli.im > wrote:

> > Hmm, ok, if you use "lttng list -k" do they appear in the list of
> 
> > available events?
> 

> > One other thing I can think about is that the statedump itself takes a
> 
> > little bit of time to execute, so the statedump events are never at the
> 
> > very start of the trace. So if your traces are very short it's possible
> 
> > to miss them entirely.
> 

> > Cheers,
> 
> > Alexandre
> 

> > On 14-01-24 08:54 AM, Krishanth TJ wrote:
> 
> > > Hi,
> 
> > >
> 
> > > I have confirmed that the "lttng-modules-dkms" package was successfully
> 
> > > installed.
> 
> > >
> 
> > > $ cat /usr/src/lttng-modules-2.3.x+stable/ChangeLog | head -4
> 
> > > 2013-09-28 LTTng modules 2.3.2
> 
> > > * Blacklist kernels 3.10.13 and 3.11.2
> 
> > >
> 
> > > I have even confirmed with few debug printk's in lttng_statedump.ko that
> 
> > > the module is indeed loaded and the tracepoints are getting called. But
> 
> > > still babeltrace output fails to show lttng_statedump_events.
> 
> > >
> 
> > > Am I missing something here?
> 
> > >
> 
> > > Regards,
> 
> > > Krish.
> 
> > >
> 

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-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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