cpu time for page fault, the modified page numbers

MMU page fault exception does address major, minor and protection
faults as it requires interrupted in order for a process to
trap in kernel. DTrace built-in probe offers a high level overview
on the latency and count metrics such as maj_fault probe, as_fault probe.
If you want to aggregate the all latency caused by page in not only because of
page fault, try pagin probe.

However, if you want have grained level instrumentation, Please consider
instrument unix module function calls such as pagefault entry, as_fault_* entry,
anon_map_privatepages,anon_private etc. and also segement driver fault in case.
Dtrace fbt provider does address the need.