Method and apparatus for calculating disk-access footprints for

Details Method and apparatus for calculating disk-access footprints for Method and apparatus for calculating disk-access footprints for

1988-07-26

1992-08-25

Lee, Thomas C.

Boots, shoes, and leggings

3642484, 3649218, 3649427, 364962, 364DIG2, 395600, G06F 1200

Patent

active

051426706

ABSTRACT:
A mechanism within a disk controller that computes the number of units of storage space accessed as a function of either real or virtual time. A counter is set to a reference count. Each unit of storage space has a predetermined bit set to a predetermined state indicative that the unit of storage space has not been accessed. The unit of storage space is accessed, and if the predetermined bit is in the predetermined state, the state is changed to indicate access. The counter is incremented in response to the change of state of the predetermined bit, with the count being indicative of the number of units of storage space accessed. This so-called "footprint" function can be used by the disk controller as input for an algorithm that attempts to optimize cache performance.

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