MB>
  >  > I don't agree that address space, per se, is a "real
quantity."
  >  > It certainly has no representation, for example, in the LDT.  In
  >  > effect, address space is a notification to the operating system
  >  > that memory may be committed.  As Peter has pointed out, even
  >
  >  MP> Let me get this right, you are saying that there is an
  >  MP> infinte amount of address space? It is impossible to
  >  MP> run out of adress space? If not, it is a "real
  >  MP> quantity".
  >
  > No, of course you can run out of it.  What I am saying is
  > that there is no processor-defined structure comparable to
  > the LDT which contains allocations of address space.
MB>

  The page tables for each process will reflect what portions of the
  address space have been allocated, and what portions have not.

  > JdeBP <
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