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dm cache: fix grammar in cache-policies.txt
Use possessive pronoun where appropriate, instead of contraction. Signed-off-by: mulhern <amulhern@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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@ -60,7 +60,7 @@ Memory usage:
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The mq policy used a lot of memory; 88 bytes per cache block on a 64
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The mq policy used a lot of memory; 88 bytes per cache block on a 64
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bit machine.
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bit machine.
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smq uses 28bit indexes to implement it's data structures rather than
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smq uses 28bit indexes to implement its data structures rather than
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pointers. It avoids storing an explicit hit count for each block. It
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pointers. It avoids storing an explicit hit count for each block. It
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has a 'hotspot' queue, rather than a pre-cache, which uses a quarter of
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has a 'hotspot' queue, rather than a pre-cache, which uses a quarter of
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the entries (each hotspot block covers a larger area than a single
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the entries (each hotspot block covers a larger area than a single
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@ -84,7 +84,7 @@ resulting in better promotion/demotion decisions.
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Adaptability:
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Adaptability:
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The mq policy maintained a hit count for each cache block. For a
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The mq policy maintained a hit count for each cache block. For a
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different block to get promoted to the cache it's hit count has to
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different block to get promoted to the cache its hit count has to
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exceed the lowest currently in the cache. This meant it could take a
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exceed the lowest currently in the cache. This meant it could take a
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long time for the cache to adapt between varying IO patterns.
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long time for the cache to adapt between varying IO patterns.
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