Invisible wrote:
> Because in order to do this, the OS would have to keep track of not only 
> what resources are in use, but *who* is using them.

Yes, it does that. Especially with VM, as you say, since every time the OS 
switches to running a different process, it has to reassign what pages of 
physical memory go with which virtual addresses.

-- 
Darren New, San Diego CA, USA (PST)
  "How did he die?"   "He got shot in the hand."
     "That was fatal?"
          "He was holding a live grenade at the time."

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