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Virtual Memory
nAll memory references made by a program are to virtual
memory which can be either
ua
linear address space
ua
collection of segments (variable-length blocks)
nThe hardware (mapper) must map virtual memory address to
real memory address
nIf a reference is made to a virtual address not in memory,
then
u(1)
a portion of the content of real memory is swapped out to disk
u(2)
the desired block of data is swapped in