Method for allocating ownership of portions of memory in a coher

Details Method for allocating ownership of portions of memory in a coher Method for allocating ownership of portions of memory in a coher

1996-11-12

1999-04-06

Swann, Tod R.

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

711154, G06F 1206

Patent

active

058931619

ABSTRACT:
A method of memory space allocation, performed within a coherent memory of a computer system, for allocating a line of the memory to a device using an ownership-only command, which transfers ownership of the line of memory without transferring the data contained within the line. After receiving the command, the memory then determines if the line was previously allocated to a second device using a conventional read command, the memory sends a flush command to the second device, and retrieves the contents of the line from the second device. After retrieving the contents of the line, or if the second device used the ownership-only command, the memory sends an ownership acknowledgment for the line to the first device, receives replacement data for the line from the first device, and then releases ownership of the line.

REFERENCES:
patent: 4622631 (1986-11-01), Frank et al.
patent: 4665484 (1987-05-01), Nanba
patent: 5265232 (1993-11-01), Gannon et al.
patent: 5490261 (1996-02-01), Bean et al.

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