Method to decrease computation for cache eviction using deferred calculations
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United States of America Patent
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Mar 20, 2018
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app pub date -
Jan 30, 2015
filing date -
Jan 30, 2015
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Abstract
A data processing system and methods for performing cache eviction are disclosed. An exemplary method includes maintaining a metadata set for each cache unit of a cache device, wherein the cache device comprises a plurality of cache units, each cache unit having a plurality of segments, calculating a score for each metadata set, and arranging the metadata sets in a list in ascending order from lowest score to highest score. The exemplary method further includes in response to determining that a cache eviction is to be performed, selecting a cache unit corresponding to the metadata set in the list having the lowest score, without recalculating a score for any of the metadata set, and evicting the selected cache unit. The metadata nay include, for example, segment count metadata, validity metadata, last access time (LAT) metadata, and hotness metadata.
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