However, with virtual memory, the computer can look at the RAM for areas that haven't been recently used and then copy them over to the hard drive. By doing this, valuable RAM space is opened up ...

Then, take a look at the Darwin/OS X code to see what they do for TLB Misses and/or page faults.<BR><BR>My guess is that they just use the straight up PPC hardware assisted lookup.

Any modern OS will use all available memory for caching, which is great for physical machines, but not great for virtual machines, since the host can make better overall caching decisions than the ...