wakesnoop attaches to scheduler tracepoints sched_waking and sched_wakeup, and
measures delay of wakeup. Measurements exceeding threshold, matching cpu mask
and pid are printed. If no optional arguments are provided, the tool prints all
measurements.
USAGE: wakesnoop.bt [wakeup delay threshold, us] [cpu mask] [pid]
# ./sched/wakesnoop.bt 100
Attaching 4 probes...
Tracing scheduler delay and in microseconds. Ctrl-C to end.
TIME DELAY(us) CPU PID COMM
21:49:23.425949 123 7 6124 pulseaudio
21:49:23.534792 116 8 32155 VizCompositorTh
21:49:24.213697 145 5 6124 pulseaudio
21:49:24.315695 113 5 6124 pulseaudio
21:49:24.603702 107 5 6124 pulseaudio
21:49:24.652704 107 5 444683 kworker/u25:3