Access-based eviction of blocks from solid state drive cache memory
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United States of America Patent
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Jan 30, 2018
Grant Date -
Dec 22, 2016
app pub date -
Sep 2, 2016
filing date -
Feb 17, 2015
priority date (Note) -
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Abstract
Methods and systems are presented for allocating CPU cycles among processes in a storage system. One method includes operations for maintaining segments in a first memory, each segment including blocks, and for maintaining a block temperature for each block in a second memory. The first memory is a read-cache where one segment is written at a time, and each block is readable from the first memory without reading the corresponding complete segment. The block temperature is based on the frequency of access to the respective block, and a segment temperature is based on the block temperature of its blocks. Additionally, the segment with the lowest segment temperature is selected for eviction from the second memory, and blocks in the selected segment with a block temperature greater than a threshold temperature are identified. The selected segment is evicted, and a segment with the identified blocks is written to the first memory.
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