DTrace probes for R

I've integrated some DTrace [1] probes into R. Namely a probe which
fires on fuction entry and return and one which fires before / after a
garbage collection.

Is there any interest in merging something like this into R-devel? If
yes, I'd like to discuss which probes and what data would be useful /
interesting from a developers standpoint.

Greetings from Dortmund,
Olaf Mersmann

[1] http://www.sun.com/bigadmin/content/dtrace/