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Re: [Qemu-devel] [RFC PATCH v3 4/5] Update documentation for LTTng ust t


From: Mohamad Gebai
Subject: Re: [Qemu-devel] [RFC PATCH v3 4/5] Update documentation for LTTng ust tracing
Date: Wed, 16 Oct 2013 21:02:01 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6

On 13-10-16 08:05 AM, Alex Bennée wrote:
Running this gives me:

<quote>
UST events:
-------------
None
</quote>

Before or after running qemu. What is the mechanism lttng expects to
find out all these events?
Either the user should belong the group "tracing", or launch the
lttng-sessiond daemon (lttng-sessiond -d).
<snip>

Hmm I've done both and I get nothing still. I can enable all tracepoints
though. This could just be a Ubuntu weirdness thing though.

That's weird. I did test it on a clean Ubuntu Precise (in a VM) and I didn't have any problem after either one of these steps. Can you please make sure that the user belongs to the "tracing" group and that the lttng-sessiond daemon is running before running any instance of Qemu. Also, Qemu should be running for LTTng to be able to list the events.

Does lttng enable-event -a -u/start/stop/view show any event?


I'm not sure if mentioning the group/daemon requirements in the tracing
doc is required though. I guess these things can be a little
package/distro specific?

'

This isn't really specific to Ubuntu, it's the setup of LTTng so I guess I could add it to the documentation as well.

Thanks!
Mohamad



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