Embedded Linux Development Using Yocto Project Cookbook - Second Edition

How to do it...

A kernel profiling session workflow is as follows:

1. Create a profiling session with the following:

# lttng create test-session
Spawning a session daemon
Session test-session created.
Traces will be written in /home/root/lttng-traces/test-session-20171213-201520  

2. Enable the events you want to trace with the following:

# lttng enable-event --kernel sched_switch,sched_process_fork
Kernel event sched_switch created in channel channel0
Kernel event sched_process_fork created in channel channel0  

3. You can get a list of the available kernel events with the following:

# lttng list --kernel  

This corresponds to the static tracepoint events available in the Linux kernel.

4. Now, you are ready to start sampling profiling data:

# lttng ...