Clock algorithm
Describe Clock algorithm ?
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Clock algorithm: keep reference bit for each of the page frame, hardware sets the reference bit when a page is read or written. To select page for placement:
· Start along with FIFO approach: cycle through pages in circularly order.
· If the next page has been referenced, don't replace it; only clear the reference bit and continue to the next page.
· If the page has not been referenced sincer the last time we verified it, then replace that page.
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