Virtual Memory and I/O Hardware/Software

Virtual Memory is a storage allocation scheme in which secondary memory can be addressed as though it were part of the main memory.

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The basis of virtual memory is the contiguous memory allocation model.

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In virtual memory, each virtual address is translated to a physical address.

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Paging happens whenever a page fault occurs and a free page cannot be used for allocation purpose accounting to reason that pages are not available or the number of free pages is lower than required pages.

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The size of virtual storage is limited by the following except ____.

• addressing scheme of the computer system

• actual number of main storage locations

• amount of secondary memory available

Its main job is to translate virtual addresses into physical addresses.

Virtual memory can be implemented by ____ and ____.

While executing a program, if the program references a page which is not available in the main memory because it was swapped out a little ago, the processor treats this invalid memory reference as a ____ and transfers control from the program to the operating system to demand the page back into the memory.

The process of loading the page into memory on demand (whenever a page fault occurs) is known as ____.

When a process is busy swapping pages in and out, then this situation is called ____.