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Free page pool

Explain Free page pool?

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Free page pool: some systems have a small list of clean pages which are available immediately for replacement.

  • During replacement, take the page which has been in the free pool the longest time, then run the replacement algorithm to insert a new page to the free pool.
  • Pages in the free pool put their exists bit off, therefore any references to those pages cause a page fault.
  • If a page fault takes place for a page in the free pool, eliminate it from the free pool and put it back in service; much faster than reading from disk.
  •  Provides an extra chance for recovery if we make a poor page replacement decision.

 

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