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Cache mechanism and method for avoiding cast out on bad victim select and recycling victim select operation
   
Document Number
US Patent 7343455
Issued Date
March 11, 2008
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Abstract
A method, apparatus, and computer for identifying selection of a bad victim during victim selection at a cache and recovering from such bad victim selection without causing the system to crash or suspend forward progress of the victim selection process. Among the bad victim selection addressed are recovery from selection of a deleted member and recovery from use of LRU state bits that do not map to a member within the congruence class. When LRU victim selection logic generates an output vector identifying a victim, the output vector is checked to ensure that it is a valid vector (non-null) and that it is not pointing to a deleted member. When the output vector is not valid or points to a deleted member, the LRU victim selection logic is triggered to re-start the victim selection process.
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Number of Claims:
6
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Published
March 11, 2008
Application Number
11/054,394
Filed
February 9, 2005
US Classification
711/136   711/E12.072 711/E12.075
Int'l Classification
G06F   12/00   (20060101)  
Examiner
USPTO Field of Search
711/128   711/134   711/136  
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