Memory paging

Common card · No. 207656

In computer operating systems, memory paging is a memory management scheme that introduces a level of indirection between physical and logical addresses and allows the physical memory used by a program to be non-contiguous. This also helps avoid the problem of memory fragmentation. Paging is often combined with the related technique of allocating and freeing page frames and storing pages on and retrieving them from secondary storage in order to allow the aggregate size of the address spaces to exceed the physical memory of the system. For historical reasons, this technique is sometimes referred to as swapping. When combined with virtual memory, it is known as paged virtual memory. In this scheme, the operating system retrieves data from secondary storage in blocks of the same size (pages). Paging is an important part of virtual memory implementations in modern operating systems, using secondary storage to let programs exceed the size of available physical memory. Hardware support is necessary...

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