Reference and change table storage system for virtual memory dat

Details Reference and change table storage system for virtual memory dat Reference and change table storage system for virtual memory dat

1990-01-11

1992-10-13

Lee, Thomas C.

Boots, shoes, and leggings

395800, 395400, 364DIG1, 3642563, 3642564, G06F 1300, G06F 936

Patent

active

051558343

ABSTRACT:
In a multi-processor virtual memory system 10 a Reference and Change Table (RCT) 36 is located upon a Memory Control Unit (MCU) 25. The RCT 36 is responsive to accesses to any of the Memory Modules (MMs) 24-26 and generates and maintains status bits indicative of the reference and change activity of all of page frames of the system memory that are accessible by any of the CPUs 12A-12n. In that each of the CPUs 12A-12n has access to the page frames of the system memory each of the CPUs 12A-12n is further enabled, via privileged instructions, to test (read) and reset (clear) over a system bus 16 the memory page frame status bits that are generated and stored by the RCT 36. As such, the RCT provides to multiple data processors a centralized and readily accessible store of status information relating to page frames of the system memory.

REFERENCES:
patent: 3840863 (1974-10-01), Fuqua
patent: 3983537 (1976-09-01), Parsons et al.
patent: 4042911 (1977-10-01), Bourke et al.
patent: 4084230 (1978-04-01), Matick
patent: 4096568 (1978-06-01), Bennett et al.
patent: 4126894 (1978-11-01), Cronshaw et al.
patent: 4128875 (1978-12-01), Thurber et al.
patent: 4151593 (1979-04-01), Jenkins et al.
patent: 4181937 (1980-01-01), Hattori et al.
patent: 4277826 (1981-07-01), Collins et al.
patent: 4290104 (1981-09-01), Holtey et al.
patent: 4340776 (1982-07-01), Ganz et al.
patent: 4410941 (1983-10-01), Barrow et al.
patent: 4414624 (1983-11-01), Summer, Jr. et al.
patent: 4445170 (1984-04-01), Hughes et al.
patent: 4484273 (1984-11-01), Stiffler et al.
patent: 4564900 (1986-01-01), Smitt
patent: 4608631 (1986-10-01), Stiffler et al.
patent: 4638426 (1987-01-01), Chang et al.
patent: 4654819 (1987-03-01), Stiffler et al.
patent: 4680700 (1987-07-01), Hester et al.
patent: 4714993 (1987-12-01), Livingston et al.
patent: 4748627 (1988-05-01), Ohsawa
patent: 4758993 (1988-07-01), Takemae
patent: 4792895 (1988-12-01), Tallman
patent: 4807189 (1989-02-01), Pinkham et al.
patent: 4959770 (1990-09-01), Kondo et al.
"Reference and Change Bit Recording" by R. Hoffman et al., IBM Tech. Disc. Bulletin, vol. 23, No. 12, May 1981.

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