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paging |
4 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Page \Page\, v. t. [imp. & p. p. {Paged}; p. pr & vb n. {Paging}.] To mark or number the pages of as a book or manuscript; to furnish with folios. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Paging \Pa"ging\, n. The marking or numbering of the pages of a book. From WordNet r 1.6 [wn]: paging n : calling out the name of a person (especially by a loudspeaker system); "the public address system in the hospital was used for paging" From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]: pagingA technique for increasing the memory space available by moving infrequently-used parts of a program's working memory from {RAM} to a secondary storage medium, usually disk. The unit of transfer is called a page. A {memory management unit} (MMU) monitors accesses to memory and splits each address into a page number (the most significant bits) and an offset within that page (the lower bits). It then looks up the page number in its page table. The page may be marked as paged in or paged out If it is paged in then the memory access can proceed after translating the {virtual address} to a {physical address}. If the requested page is paged out then space must be made for it by paging out some other page, i.e. copying it to disk. The requested page is then located on the area of the disk allocated for "{swap space}" and is read back into {RAM}. The page table is updated to indicate that the page is paged in and its physical address recorded. The MMU also records whether a page has been modified since it was last paged in If it has not been modified then there is no need to copy it back to disk and the space can be reused immediately. Paging allows the total memory requirements of all running tasks (possibly just one) to exceed the amount of {physical memory}, whereas {swapping} simply allows multiple processes to run concurrently, so long as each process on its own fits within {physical memory}. (1996-11-22)
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