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Chapter 10 : Case Study - UNIX - page 26 / 48

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Ceng 334 - Operating Systems

10-26

Basic Clock Algorithm (1)

The pointer (hand) points to the oldest page

When a page fault occurs,

if the R bit of the pointed page is 0 (page not referred), this page is evicted (the new page replaces this page - written to disk first if it is dirty)

if the R bit is 1 (page accessed), R bit is cleared and the hand is advanced to the next page

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