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Virtual memory - Wikipedia, the free encyclopedia (2847 words) |
 | To properly implement virtual memory the CPU (or a device attatched to it) must provide a way for the operating system to map virtual memory to physical memory and for it to detect when an address is required that does not currently relate to main memory so that the needed data can be swapped in. |
| Addresses with entries in the TLB require no additional memory references (and therefore time) to translate, However, the TLB can only maintain a fixed number of mappings between virtual and physical addresses; when the needed translation is not resident in the TLB, action will have to be taken to load it in. |
| It is possible to avoid the overhead of address relocation using a process called rebasing, which uses metadata in the executable image header to guarantee to the run-time loader that the image will only run within a certain virtual address space. |
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