#page_replacement_algorithm
Page replacement algorithm
Algorithm for virtual memory implementation
In a computer operating system that uses paging for virtual memory management, page replacement algorithms decide which memory pages to page out, sometimes called swap out, or write to disk, when a page of memory needs to be allocated. Page replacement happens when a requested page is not in memory and a free page cannot be used to satisfy the allocation, either because there are none, or because the number of free pages is lower than some threshold.
Sun 7th
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