anand76 d9c0d44dab Add a perf level for measuring user thread block time (#12368) ... Summary: Enabling time PerfCounter stats in RocksDB is currently very expensive, as it enables all sorts of relatively uninteresting stats, such as iteration, point lookup breakdown etc. This PR adds a new perf level between `kEnableCount` and `kEnableTimeExceptForMutex` to enable stats for time spent by user (i.e a RocksDB user) threads blocked by other RocksDB threads or events, such as a write group leader, write delay or stalls etc. It does not include time spent waiting to acquire mutexes, or waiting for IO. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12368 Test Plan: Add a unit test for write_thread_wait_nanos Reviewed By: ajkr Differential Revision: D54021583 Pulled By: anand1976 fbshipit-source-id: 3f6fcf71010132ffffca0391a5565f3b59fddd48		2024-02-22 12:14:53 -08:00
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.gitkeep	Better management of unreleased HISTORY (#11481)	2023-05-30 16:42:49 -07:00
perf_level_for_blocking_events.md	Add a perf level for measuring user thread block time (#12368)	2024-02-22 12:14:53 -08:00