Variable split virtual address space allocation with multi-syste

Details Variable split virtual address space allocation with multi-syste Variable split virtual address space allocation with multi-syste

1996-05-03

1999-02-16

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Memory configuring

711212, G06F 1200

Patent

active

058731202

ABSTRACT:
A virtual memory system is disclosed, providing a virtual address space of virtual addresses simultaneously available to a given process. The virtual address space includes a process private space accessible only to a given process, as well as a shared space of virtual addresses potentially accessible to two or more processes. The process private space includes virtual addresses on one side of a private/shared virtual address boundary, while the virtual addresses within the shared space are on the other side of the private/shared virtual address boundary. The private/shared boundary is ensured to be greater than a predetermined highest process private (or shared) virtual address of a different virtual memory system, and less than or equal to a predetermined lowest shared (or process private) virtual address of that different virtual memory system. Compatibility is ensured for software written for the different virtual memory system, allowing such software to run without modification on the present system. In an example embodiment, the private/shared boundary is set responsive to a user input reflecting a desired ratio between shared and process private space.

REFERENCES:
patent: 4991082 (1991-02-01), Yoshizawa et al.
patent: 5450587 (1995-09-01), Salm
patent: 5539899 (1996-07-01), Huynh et al.

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