Unlike TRACE_FORMAT() macros, the TRACE_EVENT() macros do not show the event name in the trace file. Knowing the event type in the trace output is very useful. Instead of: task swapper:0 [140] ==> ntpd:3308 [120] We now have: sched_switch: task swapper:0 [140] ==> ntpd:3308 [120] Signed-off-by: Steven Rostedt <srostedt@redhat.com>