Print Durations
- Allow timelines bars to be draw for debugfs ftrace print markers
- Use "duration=", "begin_ctx=", "end_ctx=" markups in print events
- Examples:
tracing_mark_write: thread_1: [#1 pid=7159 tid=7170] sleeping for 0.10 seconds (duration=100.00ms)
tracing_mark_write: thread_main: [#-1 pid=7159 tid=7159] Waiting for thread #4 (begin_ctx=4)
tracing_mark_write: thread_main: [#-1 pid=7159 tid=7159] Thread #4 rc=0 status=7173 (end_ctx=4)
Graph for the above examples:
https://raw.githubusercontent.com/wiki/mikesart/gpuvis/images/print_durations.jpg
