page fault
page fault
page fault
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Prepaging Prepaging To reduce the large number of <strong>page</strong> <strong>fault</strong>s that occurs atprocess startup Pre<strong>page</strong> all or some of the <strong>page</strong>s a process will need, beforethey are referenced But if pre<strong>page</strong>d <strong>page</strong>s are unused, I/O and memory waswasted Assume s <strong>page</strong>s are pre<strong>page</strong>d and α of the <strong>page</strong>s is used• Is cost of s * α save <strong>page</strong>s <strong>fault</strong>s > or < than the cost of prepagings * (1- α) unnecessary <strong>page</strong>s?• α near zero prepaging loses
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