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For reading, most operating systems use demand paging. This means that pages are only read from the disk into physical memory when they are needed. In the page table, there is a resident status bit, which says whether or not a valid page resides in physical memory. If the MMU tries to get a physical page number for a valid page which is not resident in physical memory, it issues a pagefault to the operating system. The OS then loads that page from disk, and then returns to the MMU to ?nish the translation.
In addition, many operating systems make some use of pre-fetching, which is called pre-paging when used for pages. The OS guesses which page will be needed next, and begins loading it in the background, to avoid future pagefaults. This depends heavily on locality of accesses, namely that future accesses will be near recent accesses, and this often true.
Q. Which of the subsequent instructions should be privileged? a) Read the clock b) Clear memory c) Set value of timer d) Issue a trap instruction e) Turn off interr
trace the historical evolution of the operations managent from themainly rural agricultural era of the artisans to the present day industrial revolution, high technoligical advance
Write a short note on disk structure Modern disk drives are initiate as large one dimensional array of logical blocks where the logical block is the smallest unit of transfer.
Demand paging gives that pages could only be brought into memory if the running process acts them. This is usually referred to as lazy evaluation as only those pages operated by
advantages and disadvantages
Explain system-wide open-file and per-process open-file The system-wide open-file table have a copy of the FCB of each open file, as well as other information. The per-pr
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I am not getting what you have tried to describe here. Can you elaborate more about this, i will be thankful to you. Vinay
Explain Structure The Grammar for programming language is a formal description of Structure
Interval among the time of submission and completion of the job is known as Interval among the time of submission and completion of the job is known as Turn
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