![]() ![]() If a process needs data and that data exists in memory but is being allotted to another process at the same moment, it is referred to as a "MINOR PAGE FAULT". If a required page is not located on the hard disk but is found somewhere else in memory, it is referred to as a "SOFT PAGE FAULT". If a required page exists in the hard disk's page file, it is referred to as a "HARD PAGE FAULT". The page fault rate is measured per second. The rate at which threads locate page faults in memory is referred to as the "PAGE FAULT RATE". The time it takes to get a page from secondary memory and recover it from the main memory after loading the required page is known as "PAGE FAULT TIME". If the needed page has not existed in the main memory (RAM), it is known as "PAGE MISS". When the CPU attempts to obtain a needed page from main memory and the page exists in main memory (RAM), it is referred to as a "PAGE HIT". Some terminologies of page fault are as follows: There are various page fault terminologies in the operating system.
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