The following is a demonstration of the vmbypid.d command,

# vmbypid.d

Tracing... Hit Ctrl-C to end.

^C

EXEC PID VM VALUE

find 19216 prot_fault 1

bash 19216 zfod 1

dtrace 19215 pgfrec 3

dtrace 19215 pgrec 3

bash 19216 pgfrec 5

bash 19216 pgrec 5

find 19216 cow_fault 6

find 19216 pgfrec 6

find 19216 pgrec 6

bash 19216 prot_fault 10

bash 19216 cow_fault 15

bash 19155 prot_fault 30

dtrace 19215 zfod 52

find 19216 zfod 54

dtrace 19215 as_fault 56

bash 19216 as_fault 74

find 19216 as_fault 91

find 19216 fspgin 315

find 19216 pgin 315

find 19216 pgpgin 315

find 19216 maj_fault 315

In the above output, the find command at PID 19211 triggered 315 maj_faults -

major faults, that would require disk activity to satisfy (as confirmed by the

pgpgin value for pages paged in).