TAILIEUCHUNG - Lecture Operating system principles - Chapter 8: Virtual memory

After studying this chapter, you should be able to: Define virtual memory; describe the hardware and control structures that support virtual memory; describe the various OS mechanisms used to implement virtual memory; describe the virtual memory management mechanisms in UNIX, Linux, and Windows 7. | Chapter 8 Virtual Memory Real memory Main memory, the actual RAM, where a process executes Virtual memory is a storage allocation scheme in which secondary memory can be addressed as though it were part of main memory Size is limited by the amount of secondary memory available Virtual address is the address assigned to a location in virtual memory Keys to Virtual Memory 1) Memory references are logical addresses that are dynamically translated into physical addresses at run time A process may be swapped in and out of main memory, occupying different regions at different times during execution 2) A process may be broken up into pieces (pages or segments) that do not need to be located contiguously in main memory Breakthrough in Memory Management If both of those two characteristics are present, then it is not necessary that all of the pages or all of the segments of a process be in main memory during execution. If the next instruction and the next data location are in memory .

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• Operating system
• Lecture Operating system principles
• Hệ điều hành
• Computer system
• Virtual memory
• Control structures
• Operating system concepts
• Lecture Operating system concepts
• Operating system services
• Operating system structures
• Operating system design
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• Operating System Debugging
• Operating System Generation
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• The Linux system