Scheduling device operations in a buffered peripheral subsystem

Details Scheduling device operations in a buffered peripheral subsystem Scheduling device operations in a buffered peripheral subsystem

1981-03-06

1984-08-21

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 1300

Patent

active

044674112

ABSTRACT:
Data transfers between respective buffer segments and data source-sinks, such as peripheral data storage devices, are scheduled as a series of transfers based upon most recent, next most recent, to the least recent usage of the buffer segments by a utilization device. A list of segments ordered by such usage is dynamically maintained. Replacement of segment allocations among devices proceeds from the least recently used, next least recently used, etc. to the most recently used segments. Therefore a single list controls replacement and read ahead (prefetch) of data from devices to the buffer and transfer of data from the buffer to the devices, all based on utilization of the buffer by the utilization device.

REFERENCES:
patent: Re26624 (1969-07-01), Bloom et al.
patent: 3911401 (1975-10-01), Lee et al.
patent: 4047243 (1977-09-01), Dijkstra
patent: 4052704 (1977-10-01), Franaszek
patent: 4086629 (1978-08-01), Desyllas

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