Probably because the author know the state of the user tracing where DTrace support has
been/is being incorporated in many tools: Ruby, etc which simplify a lot the tracing by the
Whereas currently SystemTap doesn't have this 'support' of all the enduser tools.
>we aren't a long way off.
Depends of your measurements! If you look at Ted Tso complaints, support of SystemTap by
endusers tools, the schedule, SystemTap appears to be very, very late compared to DTrace..