why_pmu_not_work
We need libpfm to encode event names for perf_event_open(2).
$ git clone https://git.code.sf.net/p/perfmon2/libpfm4 perfmon2-libpfm4
$ cd perfmon2-libpfm4
$ make
$ make install
ROS2 library stacks are supposed to be installed.
source /opt/ros/galactic/setup.bash
ros2 launch launch.py