|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| n | Simple to
implement--adopted by many OS (like |
|||||||||||||||
| Unix SVR4) |
||||||||||||||||
| n | A list of
free frames is maintained |
|||||||||||||||
| u | when a process
issues a page fault, a free frame |
|||||||||||||||
| (from this list)
is allocated to it |
||||||||||||||||
| u | Hence the number
of frames allocated to a page |
|||||||||||||||
| fault process
increases |
||||||||||||||||
| u | The choice for
the process that will loose a frame |
|||||||||||||||
| is arbitrary: far
from optimal |
||||||||||||||||
| n | Page
buffering can alleviate this problem since |
|||||||||||||||
| a page may be
reclaimed if it is referenced again |
||||||||||||||||
| soon |
||||||||||||||||
