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由 Zhongyi Xie 提交于
Summary: Current implementation of perf context is level agnostic. Making it hard to do performance evaluation for the LSM tree. This PR adds `PerfContextByLevel` to decompose the counters by level. This will be helpful when analyzing point and range query performance as well as tuning bloom filter Also replaced __thread with thread_local keyword for perf_context Pull Request resolved: https://github.com/facebook/rocksdb/pull/4226 Differential Revision: D10369509 Pulled By: miasantreble fbshipit-source-id: f1ced4e0de5fcebdb7f9cff36164516bc6382d82
d6ec2887
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