[lttng-dev] Beginner question: how to inspect scheduling of multi-threaded user application?

[David Aldrich]

Hi Jonathan

Thanks, I had not logged out/in after joining the tracing group.

I now see:

$ lttng create demo_session
Session demo_session created.
$ sudo lttng enable-event -k sched_switch -s demo_session
Error: Event sched_switch: Kernel tracer not available (channel channel0, session demo_session)
Warning: Some command(s) went wrong

What do I need to install?

Best regards

David