Merging identical memory pages

Details Merging identical memory pages Merging identical memory pages

2005-08-15

2008-12-30

Bragdon, Reginald G (Department: 2189)

Electrical computers and digital processing systems: memory

Address formation

Address mapping

C711S006000

Reexamination Certificate

active

07472252

ABSTRACT:
Multiple virtual addresses map to the same physical location in memory if it has been determined that they are all intended to access the same data. In one embodiment, such virtual addresses are identified, and correspondence information (such as from a translation table) is changed in order to ensure that they all correspond to the same physical location, thus freeing up memory and preventing problems such as undue swapping. A memory request servicer and translation table are used in one embodiment in order to properly respond to two requests, using different virtual addresses, both of which store identical data, by accessing the same location in physical memory. In one embodiment, code rebasing for a code page is only performed if it has not been performed before; if it has, a reference to the already rebased code page is returned. Physical memory which has more than one use (e.g. physical memory referred to by multiple virtual addresses) is designated read-only.

REFERENCES:
patent: 6103226 (2000-08-01), Kang et al.
patent: 2004/0098544 (2004-05-01), Gaither et al.
patent: 2005/0055528 (2005-03-01), Arimilli et al.
patent: 2005/0076156 (2005-04-01), Lowell

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