Memory management system having a forward progress bit

Details Memory management system having a forward progress bit Memory management system having a forward progress bit

2004-10-29

2008-05-06

Wu, Xiao (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics display memory system

Frame buffer

C707S793000, C707S793000, C707S793000, C711S219000, C711S156000, C711S157000, C711S158000

Reexamination Certificate

active

07369135

ABSTRACT:
A virtual memory system that maintains a list of pages that are required to be resident in a frame buffer to guarantee the eventual forward progress of a graphics application context running on a graphics system composed of multiple clients. Pages that are required to be in the frame buffer memory are never swapped out of that memory. The required page list can be dynamically sized or fixed sized. A tag file is used to prevent page swapping of a page from the frame buffer that is required to make forward progress. A forward progress indicator signifies that a page faulting client has made forward progress on behalf of a context. The presence of a forward progress indicator is used to clear the tag file, thus enabling page swapping of the previously tagged pages from the frame buffer memory.

REFERENCES:
patent: 6105051 (2000-08-01), Borkenhagen et al.
patent: 2003/0233394 (2003-12-01), Rudd et al.
patent: 1450257 (2004-08-01), None
International Search Report, Feb. 14, 2004.
“Sheduling Process Swapping Based on Repaging Rate” IBM Technical Disclosure Bulletin, vol. 34, No. 8 Jan. 1992 pp. 127-129.

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