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Exam 3: Memory Management: Virtual Memory Systems

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Question 21

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In demand paging,when an excessive number of pages are moved back and forth between main memory and secondary storage,it is called ____.

A) swapping
B) faulting
C) paging
D) thrashing

E) A) and C)
F) B) and D)

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Question 22

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In demand paging,the collection of pages residing in memory that can be accessed directly without incurring a page fault is called the ____.

A) page set
B) working set
C) job set
D) denning set

E) All of the above
F) None of the above

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Question 23

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One of the most important innovations of demand paging is that it makes ____ feasible.

A variation of the LRU page replacement algorithm known as the ____ replacement policy is implemented with a circular queue.

____ can be thought of as being an intermediary between main memory and the special-purpose registers,which are the domain of the CPU.

In demand paging,pages are ____ between main memory and secondary storage.

The ____ demonstrates that when using a FIFO policy,in rare cases,adding more memory to a system can cause an increase in page interrupts.

In a paged memory allocation scheme,a simple ____ has one entry for each page frame that shows its location and its free/busy status.

The primary advantage of storing programs in noncontiguous locations is that ____.

The term "____" means that during any phase of its execution,a program references only a small fraction of its pages.

A variation of the LRU page replacement algorithm known as the clock page replacement policy is implemented using a pointer to step through the reference bits of the active pages,simulating a clockwise motion.

Demand paging introduced the concept of loading only a part of the program into memory for processing

____ effectively removes restrictions on maximum program size.

A disadvantage of segmented memory allocation is ____.

Cache memory is based on the concept of using a large,fast,and expensive memory to supplement the workings of main memory.

Associative memory is a name given to several hardware registers that are allocated to each active job whose task is to associate segment and page numbers belonging to the job being processed with their main memory addresses.

In the bit-shifting variation of the LRU page replacement policy,the process of shifting bits to the right and resetting the leftmost bit to 1 when a page is referenced gives a history of each page's usage.

With demand paging,three additional fields are introduced for each page in each PMT: one to determine if the page being requested is already in memory,a second to determine if the page contents have been modified while in memory,and a third to determine if the page has been referenced most recently.

With segmented memory allocation,each job is divided into several segments of the same size,one for each module containing pieces that perform related functions.

With demand paging,if there are no empty page frames available,to move in a new page,one of the current resident pages must be placed into main memory.