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From: "Ron G. Minnich" <rminnich@Sarnoff.COM>
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Subject: Re: A question for the VM gurus..!
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> > MADV_WILLNEED appears to fault pages (again, asynchrnously, from what I can
> > tell).
> Hmmm...  time to implement kernel threads.

actually, sunos had async. read-ahead from 1988 on, long before kernel 
threads. They just queued an i/o and did not wait for the result. So you 
don't absolutely have to have kernel threads. 

ron