Hi;
JIC you are not following freebsd-hackers, there was an interesting
discussion about the linux thread-aware malloc that is under a BSD
license. This link comes from an older thread:
http://docs.freebsd.org/cgi/mid.cgi?420BB1FF.11156.68F6CEC
It does look interesting (at least for SMP), but it looks like some
kernel support will be required.
cheers,
Pedro.