System for non-current page table structure access

Details System for non-current page table structure access System for non-current page table structure access

1996-05-03

1998-11-10

Chen, Eddie P.

Electrical computers and digital processing systems: memory

Address formation

Address mapping

G06F 1210

Patent

active

058359613

ABSTRACT:
In accordance with principles of the invention there is disclosed a new system for accessing a page table structure of a non-current process. The new system modifies a current page table structure such that a process private portion of a current page table structure is replaced with a process private portion of the page table structure of the non-current process. After the necessary accesses have been performed, the present system again modifies the page table structure so that the process private portion of the current page table structure is restored to the process private portion of the page table structure of the current process. The new system does not require a complete context switch, and the target PTEs are advantageously mapped to the virtual memory locations in which they would normally reside if the target process was current. In addition the new system consumes a minimal amount of virtual memory within the current virtual memory space through reusing the page table space within the virtual address space.

REFERENCES:
patent: 4758951 (1988-07-01), Sznyter
patent: 5319758 (1994-06-01), Arai et al.

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