Term Paper on "Virtual Memory Management"

Term Paper 4 pages (1285 words) Sources: 4

[EXCERPT] . . . .

Also, Virtual memory management hides fragmentation seen in physical memory, which opens up huge amounts of. It uses a strict memory hierarchy in order to allow the kernel the ability to eliminate unnecessary memory to facilitate the greater storage of the most important memory processes. Also, virtual memory management allows the system to relocate codes or memory, so that it is off the main system that can be accessed when needed (Bryant & O'Hallaron, 2002). Overall, virtual memory management provides a fast and efficient system for dealing with large amounts of memory, some of which may not be used all the time. It also provides greater levels of security and efficiency in regards to how data is stored and managed in sensitive situations. It is clear that virtual memory management is a much better option than working with outdated physical management systems.

The process for how virtual memory addresses get translated into physical addresses is quite complicated. The two types of memory must be sequenced so that they can be easily swapped out for one another when the data needed requires for it. According to the research, "physical and virtual memory partitioned into equal sized units" can then be swapped out for each other using virtual pages and physical frames (University of Texas, 2013, p 15). When data is not frequently used, it can thus be taken off the physical memory system and put into a page of virtual memory. They must be sequenced so that they can be easily swapped out between one another. As such, "physical memory is partitioned into equal sized page frames," which can then be translated back and forth from physical and virtual memory addresses (University of Texas, 2013, p 2). This allows for the seamless translation of virtual memory addresses into physical addresses. The type of coding needed to make sure this transition is smooth is crucial, and thus virtual management memory systems can be quite complicated. Typically, "a single offset register allows the OS to place a process virtual address space anywhere in physical memory," thus allowing programs to be "swapped out of an old location and swapped into new" (University of Texas, 2013, p 1). As such, they are continuously swapped out for one another using this type of framework.

Most modern operating systems translate 32-bit and 64-bit virtual addresses to physical addresses on the same machine. Here, the research suggests, that "modern systems typically support either 32-bit or 64-bit virtual address spaces" (Bryant & O'Hallaron, 2002, p 743). These two types of spaces must be correlated so that they can be used simultaneously by more complicated machines. Modern systems that use both typically have greater hardware and software capabilities, allowing them to translate between the two spaces seamlessly. They have both capabilities hardwired into their operating system, which allows them to work both with 32-bit and 64-bit memory spaces.

Clearly, virtual memory management makes data management much more efficient. It opens up greater space for memory and increases the speed in which OS systems can retrieve data, even if it has not been used for years. The OS system must be able to correlate between virtual and physical memory pages in order to be able to swap them out seamlessly. This procedure is often conducted in-house within a single system, even with the presence of both 32-bit and 64-bit pages.

(University of Texas, 2013)

(University of Texas,2013)

References

Bryant, Randal E. & O'Hallaron, David R. (2002). Computer Systems: A Programmer's Perspective. Prentice Hall.

Case, Jeffrey. (2001). Virtual memory and Address translation. Duke University. Web. http://www.cs.duke.edu/~chase/cps210-archive/slides/vm-translate.pdf

IBM. (2009). AIX 5L Information Center. Eclipse. Web. http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.baseadmn/doc/baseadmndita/virt_mem_mgr.htm

University of Texas. (2013). Virtual memory address translation. CS 372 Operating Systems Schedule, Assignments, and Lecture Notes. Web. http://www.cs.utexas.edu/users/witchel/372/lectures/15.VirtualMemory.pdf READ MORE

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