can I actually look at the call tree that occurs when my function is being executed or will I be limited to viewing calls to functions in the postmaster binary?
You're the one with the gprof data, you tell us :)
It wouldn't surprise me if gprof didn't get profiling data for dlopen'ed shared libraries (I haven't checked), but I think both oprofile and callgrind should be able to.
(If you do decide to use gprof and you're on Linux, be sure to compile Postgres with CFLAGS="-DLINUX_PROFILE", to get valid profiling data.)
-Neil
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