Paging
Why paging is employed in OS?
Expert
Paging is solution to external fragmentation problem that is to let the logical address space of a procedure to be noncontiguous, therefore allowing a process to be allocating physical memory wherever the latter is obtainable.
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Weak Preservation: An abstraction of a concrete system is weakly preserving if a set of properties true in the abstract system encompass corresponding properties in the concrete system which are also true.
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