Performance probes

Would a patch adding dtrace/systemtap-compatible source probes be looked upon favourably? I'm fiddling with the debuginfo-based stap stuff to try and get a histogram of our ntlm_auth timings, but it strikes me that the source-based stuff could be very useful indeed; in particular appropriate DTRACE_PROBEx statements could let us time individual requests from receive to reply, with minimal performance overhead. See: https://sourceware.org/systemtap/wiki/AddingUserSpaceProbingToApps