mohamad.ge...@polymtl.ca writes: > 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.
Ahh that was it. I suggest you change the wording from: "Package lttng-tools is required for userspace tracing. After running Qemu, LTTng should be able to list all available events:" to "Package lttng-tools is required for userspace tracing. While running and instrumented Qemu, LTTng should be able to list all available events:" > Does lttng enable-event -a -u/start/stop/view show any event? Yes, as I said the rest worked fine. With that minor wording fix I'm happy. Thanks for getting this back into shape :-) -- Alex Bennée
