according to Callback duration analysis (Callback duration analysis) I should edit launch file in the path ros2_ws/src/ros2/tracing/tracetools_launch/launch/
I've finished previous steps, but I cannot find the directory ros2_ws/src/ros2. There are only two directories, ros-tracing and tracetools_analysis , in the path ros2_ws/src/
By the way, does the launch file refer to example.launch.py ? I've found multiple example.launch.py :

./install/tracetools_launch/share/tracetools_launch/launch/example.launch.py
./build/tracetools_launch/launch/example.launch.py
./src/ros-tracing/ros2_tracing/tracetools_launch/launch/example.launch.py

which one is used for the cmd ros2 launch tracetools_launch example.launch.py