Method, system, and computer program product for handling...

Details Method, system, and computer program product for handling... Method, system, and computer program product for handling...

2011-07-26

2011-07-26

Beausoliel, Robert (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S805000

Reexamination Certificate

active

07987384

ABSTRACT:
A method for handling errors in a cache memory without processor core recovery includes receiving a fetch request for data from a processor and simultaneously transmitting fetched data and a parity matching the parity of the fetched data to the processor. The fetched data is received from a higher-level cache into a low level cache of the processor. Upon determining that the fetched data failed an error check indicating that the fetched data is corrupted, the method includes requesting an execution pipeline to discontinue processing and flush its contents, and initiating a clean up sequence, which includes sending an invalidation request to the low level cache causing the low level cache to remove lines associated with the corrupted data, and requesting the execution pipeline to restart. The execution pipeline accesses a copy of the requested data from a higher-level storage location.

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z/Architecture, Principles of Operation, Sixth Edition, Apr. 2007, Publication No. SA22-7832-05, copyright IBM Corp. 1990-2007, pp. 1-1218.

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