##################################
# DTRACE - dtrace & zdb interface

# MAP ############################
ZFS & FreeBSD
        vv
    perl_probe_object_framework 
        vv
    API:
      foreach (@obj_req)
        push @RES probe($_);
        vv
    ALG:
      dresult = analyze(@RES);

##################################
# OLD ############################
zdb commands of importance
dtrace reports for early disaster detection
# ZDB ANALYSIS #######
1 - pass config verify
2 - zpool stats
3 - zfs stats
4 - dataset tool
5 - list tools
# DTRACE TOOLS #######

https://metacpan.org/source/XSAWYERX/perl-5.26.0/INSTALL#L1002
=head2 DTrace support
 
On platforms where DTrace is available, it may be enabled by
using the -Dusedtrace option to Configure. DTrace probes are available
for subroutine entry (sub-entry) and subroutine exit (sub-exit). Here's a
simple D script that uses them:
 
  perl$target:::sub-entry, perl$target:::sub-return {
    printf("%s %s (%s:%d)\n", probename == "sub-entry" ? "->" : "<-",
              copyinstr(arg0), copyinstr(arg1), arg2);
  }