Invention Grant
- Patent Title: Transparent recovery from hardware memory errors
- Patent Title (中): 从硬件内存错误中恢复透明
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Application No.: US13893465Application Date: 2013-05-14
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Publication No.: US08775903B2Publication Date: 2014-07-08
- Inventor: Carl A. Waldspurger , Dilpreet Bindra , Gregory T. Harmon , Patrick Tullmann
- Applicant: VMware, Inc.
- Applicant Address: US CA Palo Alto
- Assignee: VMware, Inc.
- Current Assignee: VMware, Inc.
- Current Assignee Address: US CA Palo Alto
- Main IPC: G06F11/00
- IPC: G06F11/00

Abstract:
A method is provided for recovering from an uncorrected memory error located at a memory address as identified by a memory device. A stored hash value for a memory page corresponding to the identified memory address is used to determine the correct data. Because the memory device specifies the location of the corrupted data, and the size of the window where the corruption occurred, the stored hash can be used to verify memory page reconstruction. With the known good part of the data in hand, the hashes of the pages using possible values in place of the corrupted data are calculated. It is expected that there will be a match between the previously stored hash and one of the computed hashes. As long as there is one and only one match, then that value, used in the place of the corrupted data, is the correct value. The corrupt data, once replaced, allows operation of the memory device to continue without needing to interrupt or otherwise affect a system's operation.
Public/Granted literature
- US20130254612A1 TRANSPARENT RECOVERY FROM HARDWARE MEMORY ERRORS Public/Granted day:2013-09-26
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