G - Physics – 06 – F
Patent
G - Physics
06
F
354/224
G06F 11/10 (2006.01) G06F 12/12 (2006.01) G06F 12/14 (2006.01)
Patent
CA 1183608
ABSTRACT OF THE DISCLOSURE In a system which is provided with a key storage having stored therein main storage keys respectively corres- ponding to pages into which a main storage is split, each main storage key having at least a reference bit indicating whether the corresponding page has been accessed and a change bit indicating whether information has been written in the page, and in which a parity bit is added to each of the reference bit and the change bit to form the main storage key, there are provided detecting means for detecting a parity error in a pair of the reference bit and the parity bit and a pair of the change bit and the parity bit when the main storage key is read out, and means for rewriting the main storage key after setting the reference bit to a "1" indicating the access to the corresponding page and adding a new parity bit "0" to the reference bit when a parity error is detected by the detecting means in the pair of the reference bit and the parity bit and after setting the change bit to a "1" indicating the write in the corresponding page and adding a new parity bit "0" to the change bit when a parity error is detected in the pair of the change bit and the parity bit, whereby to control the save of the pages of the main storage.
412069
Shimizu Kazuyuki
Tateishi Terutaka
Fetherstonhaugh & Co.
Fujitsu Limited
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