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Mac OS X Scheduler Questions

I'm trying to figure out the current scheduler in Mach, and I'm trying to
figure out where to begin. Basically, I'm trying to figure out which of
the background papers are closest to being valid, if any, so that I'll
have a starting point. A few questions:

How does the current scheduler compare to the scheduler in CMU Mach 3
(i.e. is it relatively similar, or has it diverged radically)?

Is there still a pluggable architecture for implementing alternate
scheduling policies? Is it the original [Golub93] CMU architecture, or
the OSF/RI architecture described in [Haydt94], or neither?

Beyond forcing themselves into alternate run queues with the thread
priority set API, is there any hinting API for maximizing efficiency in a
multiprocessor environment such as the ones proposed in [Black90]?

How closely does the current approach to RT support compare with that of
Real-Time Mach [Tokuda91]? Any similarity?


Thanks,
David

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