The following is a demonstration of the pgpginbypid.d script,
Here we run it for a few seconds then hit Ctrl-C,
# pgpginbypid.d
Tracing... Hit Ctrl-C to end.
^C
PID CMD PAGES
10692 find 128
10693 tar 11928
In the output above, we can see which processes are responsible for page ins,
as well as the number of pages paged in.