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18 Paging: IntroductionIt is sometimes said that the operating system takes one of two approacheswhen solving most any space-management problem. The first approachis to chop things up intovariable-sizedpieces, as we saw withsegmenta-tionin virtual memory. Unfortunately, this solution has inherent difficul-ties. In particular, when dividing a space into different-size chunks, thespace itself can becomefragmented, and thus allocation becomes morechallenging over , it may be worth considering the second approach: to chop upspace intofixed-sizedpieces.

6 PAGING: INTRODUCTION ASIDE: DATA STRUCTURE — THE PAGE TABLE One of the most important data structures in the memory management subsystem of a modern OS is the page table.In general, a page table stores virtual-to-physical address translations, thus letting the system know where each page of an address space actually resides in physical

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