haoyuhuang a8975b6245 Block cache tracer: Do not populate block cache trace record when tracing is disabled. (#5510) ... Summary: This PR makes sure that trace record is not populated when tracing is disabled. Before this PR: DB path: [/data/mysql/rocks_regression_tests/OPTIONS-myrocks-40-33-10000000/2019-06-26-13-04-41/db] readwhilewriting : 9.803 micros/op 1550408 ops/sec; 107.9 MB/s (5000000 of 5000000 found) Microseconds per read: Count: 80000000 Average: 9.8045 StdDev: 12.64 Min: 1 Median: 7.5246 Max: 25343 Percentiles: P50: 7.52 P75: 12.10 P99: 37.44 P99.9: 75.07 P99.99: 133.60 After this PR: DB path: [/data/mysql/rocks_regression_tests/OPTIONS-myrocks-40-33-10000000/2019-06-26-14-08-21/db] readwhilewriting : 8.723 micros/op 1662882 ops/sec; 115.8 MB/s (5000000 of 5000000 found) Microseconds per read: Count: 80000000 Average: 8.7236 StdDev: 12.19 Min: 1 Median: 6.7262 Max: 25229 Percentiles: P50: 6.73 P75: 10.50 P99: 31.54 P99.9: 74.81 P99.99: 132.82 Pull Request resolved: https://github.com/facebook/rocksdb/pull/5510 Differential Revision: D16016428 Pulled By: HaoyuHuang fbshipit-source-id: 3b3d11e6accf207d18ec2545b802aa01ee65901f		2019-06-27 08:34:08 -07:00
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block_cache_tracer_test.cc	Add more callers for table reader. (#5454)	2019-06-20 14:31:48 -07:00
block_cache_tracer.cc	Add more callers for table reader. (#5454)	2019-06-20 14:31:48 -07:00
block_cache_tracer.h	Block cache tracer: Do not populate block cache trace record when tracing is disabled. (#5510)	2019-06-27 08:34:08 -07:00
trace_replay.cc	Add block cache tracer. (#5410)	2019-06-06 11:24:39 -07:00
trace_replay.h	Add block cache tracer. (#5410)	2019-06-06 11:24:39 -07:00