The following is a demonstration of the xcallsbypid.d script,
Tracing... Hit Ctrl-C to end.
^C
PID CMD XCALLS
215 utmpd 3
6350 bash 3
6351 bash 3
6350 ls 24
0 sched 48
6349 dtrace 93
6351 find 5718
In the above output, we can see the find command with PID 6351 has caused
5718 cross calls.