319 |
integers identifying \keyword{virtual frame}s in the physical memory |
integers identifying \keyword{virtual frame}s in the physical memory |
320 |
server. A virtual frame references a physical frame but is not bound |
server. A virtual frame references a physical frame but is not bound |
321 |
to a particular physical frame (this allows the physical memory server |
to a particular physical frame (this allows the physical memory server |
322 |
to move the contents of frames around). Multiple physical frames may |
to move the contents of frames around). Virtual frames are the |
323 |
reference the same physical frame in which case the memory is shared. |
sharing mechanism for physical frames. Although virtual frames may |
324 |
Sharing may be either real, e.g. System V shared memory, or logical, |
not be copied, they may be logically copied thereby creating a new |
325 |
e.g. copy on write. |
virtual frame with the same underlying physical frame in which case |
326 |
|
the physical memory is shared. Sharing may be either real, |
327 |
|
e.g. System V shared memory, or logical, e.g. copy on write. |
328 |
|
|
329 |
When a virtual frame is allocated into a container, there may be no |
When a virtual frame is allocated into a container, there may be no |
330 |
physical frame associated with it. The physical memory server |
physical frame associated with it. The physical memory server |