Question: Which of the following field is used to decide whether a page out operation is needed while replacing the page?
Answer:
the modified bit indicates whether the page has been modified .i.e. whether it is dirty.
MCQ: Which of the following field is used to decide whether a page out operation is needed while replacing the page?
Correct Answer:
A. Valid bit
Explanation:
the modified bit indicates whether the page has been modified .i.e. whether it is dirty.
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Related Questions
- 1. Which of the following is the step performed in address translation by the MMU?
- 2. When a page is not present in the memory ,MMU raises an interrupt called a __________
- 3. Which of the following operations are performed by the Virtual memory manager when page fault occurs?
- 4. The virtual memory manager uses a page replacement algorithm to select one of the pages currently in memory for replacement, accesses the page table entry of the selected page to mark it as “not present” in memory and initiates a ________operation for it if the modified bit of its page table entry indicates that it is dirty page.
- 5. The virtual memory manager initiates a _____ operation to load the required page into the page frame that was occupied by the selected page and it updates the page table entry of the page to record frame number of the page frame, marks the page as “present” and makes provision to resume operation of the process.
- 6. Page-in and page-out operations are required to implement demand paging constitutes _______
- 7. Which of the following stands true for Effective memory access time for a process in demand paging?
- 8. Which of the following stands true for Effective memory access time for a process in demand paging?Where <strong><em>pr<sub>1</sub></em></strong><sub> </sub>= probability that a page exists in memory, <strong><em>t<sub>mem</sub></em></strong> = memory access time , <strong><em>t<sub>pfh</sub></em></strong> = time overhead of page fault handling
- 9. Which of the following stands true for Effective memory access time for a process in demand paging? Where <strong><em>pr<sub>1</sub></em></strong><sub> </sub>= probability that a page exists in memory, <strong><em>t<sub>mem</sub></em></strong> = memory access time , <strong><em>t<sub>pfh</sub></em></strong> = time overhead of page fault handling
- 10. Page replacement becomes necessary when <ol> <li>Page faults occur and there are no free page frames in the memory.</li> <li>Page faults occur and there are free page frames in the memory.</li> <li>Page faults would arise if the replaced page is referenced again.</li> <li>It is important to replace a page that is not likely to be referenced again in the immediate future.</li> </ol>
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