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

G - Physics

06

F

354/233

G06F 13/00 (2006.01) G06F 12/12 (2006.01) G06F 13/12 (2006.01)

Patent

CA 1172378

SCHEDULING DEVICE OPERATIONS IN A BUFFERED PERIPHERAL SUBSYSTEM Abstract Data transfers between respective buffer segments and data source-sinks, such as peripheral data storage devices are scheduled as a series of transfer based upon most recent, next most recent, etc., usage of the buffer segments by a utilization device. A "most recently used - least recently used" list of segments ordered by such usage is dynamically maintained. Replacement of segment allocations among devices proceeds from the least recent used, next least recent used, etc. segments. Therefore the single list controls replacement, read ahead (pre-fetch) 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. TU9-80-009

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