[racket] Garbage collection informaton

I'm in the midst of writing a nice performance/stress testing harness for
racket.

To measure performance with a GC language, it is very important to be able
to log accurate GC occurrences, along with how long they take.

The debug log seems to really output what I need except maybe a call to
(current-inexact-milliseconds) at the the start of the gc. Is there any sort
of way for me to determine exactly what time the GC begins along with other
sorts of good GC relatied information?

Is there any lower level hook I could get into?

Thanks,
    Curtis
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