On Mon, Dec 17, 2018 at 09:52:04AM +0530, Amit Daniel Kachhap wrote: > There is no error message or crash but no useful output like below, > > /sys/kernel/tracing # echo wake_up_process > set_graph_function > /sys/kernel/tracing # echo function_graph > current_tracer > /sys/kernel/tracing # cat trace > # tracer: function_graph > # > # CPU DURATION FUNCTION CALLS > # | | | | | | | Confirmed. The graph tracer self-test passes, but when used, there is no output. Torsten