Method and system for transparent compressed memory paging...

Details Method and system for transparent compressed memory paging... Method and system for transparent compressed memory paging...

2005-11-22

2005-11-22

Padmanabhan, Mano (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S154000, C711S170000, C711S173000, C710S068000

Reexamination Certificate

active

06968424

ABSTRACT:
A method and system for implementing transparent compressed memory paging within a computer system. Data compression is performed in memory to increase resources available to the computer system and to reduce disk accesses. The compression is performed transparently to the operating system which requires no special software interfaces to make use of the reclaimed memory. In a first embodiment, data compression is performed in hardware to reclaim memory. This reclaimed memory is not made available to the operating system but is rather used as a hardware controlled disk cache to increase system performance. In this embodiment, a novel method is employed to reduce duplicate memory pages in the disk cache and the operating system memory. In another embodiment, the reclaimed memory is made available in a transparent way to the operating system. Variable compression ratios can lead to varying physical memory space available for the operating system. Therefore, if actual memory space becomes near exhausted, a process is automatically triggered that exclusively allocates blocks of physical memory to a driver thereby removing them from operating system usage. In the second embodiment, a special cache table is used for uncompressed physical memory pages.

REFERENCES:
patent: 5696927 (1997-12-01), MacDonald et al.
patent: 6516397 (2003-02-01), Roy et al.
patent: 2002/0073298 (2002-06-01), Geiger et al.

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