Memory management system

Details Memory management system Memory management system

G - Physics

06

F

354/239

G06F 12/08 (2006.01) G06F 9/48 (2006.01) G06F 12/10 (2006.01)

Patent

CA 1273125

Abstract of the Disclosure Methods and apparatus are described for implementing fork operations on UNIX or UNIX-emulating operating systems, particularly in multi-user environments. The invention reduces the copy time, the number of page faults and, consequently the input-output ("I/0") operations between the central processing Unit, main memory and auxilliary memory. In one aspect of the invent-on, fork operations are executed by redefining those pages of the parent process image resident in main memory as pages of a child process image and modifying the page maps accordingly. Page faults are thereby eliminated for pages located in auxiliary memory. Additional improvements in performance are obtained by monitoring the level of main memory utilization and selecting optimal procedures based on the amount of excess capacity in main memory.

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