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Page fault is a trap to the software gained by the hardware when a process accesses a page that is goes in the virtual address space, but not added in physical memory. In the hard case the operating system tries to operate the page fault by creating the required page accessible at a location in physical memory disk or kills the process in the case of an illegal access. The system that detects a page fault is the memory management unit in a processor. The exception handling software that operates the page fault is usually part of the operating system.
Contrary to what the name 'page fault' might suggest, page faults are not errors and are necessary and common to raise the amount of memory available to programs in any operating system that use virtual memory, including Unix-like, Microsoft Windows systems, and z/OS. Microsoft access the term hard fault in more recent parts of the source Monitor to mean 'page fault'
Q. Explain a mechanism by which one segment could belong to the address space of two different processes. Answer: Because segment tables are a collection of base-limit register
1. On every access, mark the page with a timestamp. Whenever we need to evict a page, we search through memory for the oldest page, the least-recently used page. But we need memory
fork and join syntax in java
Q. What are the three main activities of an operating system in regard to secondary-storage management? Answer: 1) Free-space management 2) Storage allocation 3) Disk
How can an index file be used to speed up the access in direct-access files? Have an index in memory; the index gives the key and the disk location of its corresponding record.
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What is scheduler? A process migrates among the various scheduling queues throughout its life time. The OS must choose processes from these queues in some fashion. This selecti
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Define the properties operating systems: Batch :- Jobs with similar needs are batched together and run through the computer as a group by an operator or automatic job sequenc
What is multiprogramming? Multiprogramming: The management of many processes within a single processor system. Operating systems such like UNIX provide multiprogramming for sha
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