Unix Questions et reponses d'entretien
Differences associees
Question 71. What is ?the principle of locality??
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It?s the nature of the processes that they refer only to the small subset of the total data space of the process. i.e. the process frequently calls the same subroutines or executes the loop instructions.
Question 72. What is the working set of a process?
The set of pages that are referred by the process in the last ?n?, references, where ?n? is called the window of the working set of the process.
Question 73. What is the window of the working set of a process?
The window of the working set of a process is the total number in which the process had referred the set of pages in the working set of the process.
Question 74. What is called a page fault?
Page fault is referred to the situation when the process addresses a page in the working set of the process but the process fails to locate the page in the working set. And on a page fault the kernel updates the working set by reading the page from the secondary device.
Question 75. What are data structures that are used for Demand Paging?
Kernel contains 4 data structures for Demand paging. They are,
Page table entries,
Disk block descriptors,
Page frame data table (pfdata),
Swap-use table.
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