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Additional-reference-bits algorithm
We can keep an 8-bit byte for every page in a table in memory. The operating system shifts the reference bits right 1 bit, discarding the low-order bit. These 8 bits sift register have the history of page used for previous eight time periods. A page with a history value of 11000100 has been used more just than has one with 01110111. The page with the lowest number is the LRU page, and it can be changed.
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What does Verification represent? Verification shows the set of activities that are carried out to confirm that the software correctly executes the specific functionality.
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limitations
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___paging fecthces a page only when needed
what is exit status
combined approaches (ULT/KLT)
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