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valid / invalid bit is used to identify that particular page is in memory or not . and

dirty bit tells status of page means it is modified by processor or not.

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Pawan Kumar 2 asked Dec 14, 2017
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doubt 1: "when we select a page for replacement "..... is this page in victim frame ?as soon as victim frame is identified, does its modify bit set ? How it was read fr...
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A_i_$_h asked Nov 10, 2017
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Dirty bit in page table is used for1.implementing NRU page replacement2.implementing optimal page replacement