翻訳と辞書 |
paging A 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 {hard {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
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