A portable instrumentation layer will not have that information unless it
records it itself. So the question is what things can be added to MPI to
support portable instrumentation (and debugging?) without introducing
problems for either MPI developers or users.
Most of my requests are wishlist items to cut down on the overhead of the
instrumentation. I can make do without them, but if this information is
available as part of the MPI_Request, it would be nice if there were a
standard macro to pull it out.