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LRU page replacement
In slightest recently used page replacement algorithm we will replace that page that hasn't been used for the longest period of time. This is similar as an optimal page replacement algorithm looking backward in time. It is considered preferred as a good performer.
There are two processes for implementation - stack and counter. Counter is the easiest to execute in which with every page entry there is a counter or logical clock. For every memory reference it is incremented. We reinstate the page with the smallest time value. In this overflow should be considered, in stack memory allocation when a page is referenced it is removed from the stack and put on top. For the reason that the entries may be in middle it is executing using doubly linked list.
Example Consider the string 1,2,3,4,3,2,1. In this 1, 2, 3 are inserted the same as normal as 4 comes it is entered in the position of 1. When 1 comes once more 4 is replaced as it is the least referenced.
How does user specify block to be fetched in direct access? By specifying the relative block number, relative to first block in file, which is block 0.
Translation Look aside Buffer In a cached system, the base addresses of the last few indexed pages is maintained in registers named the TLB that adds in faster lookup. TLB has
Define ‘LRU’ page replacement policy LRU is Least Recently Used page replacement policy.
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