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dash/src/logging
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MarcoFalke 436a5783c7
Merge bitcoin/bitcoin#22736: log, sync: change lock contention from preprocessor directive to log category 
7e698732836121912f179b7c743a72dd6fdffa72 sync: remove DEBUG_LOCKCONTENTION preprocessor directives (Jon Atack)
9b08006bc502e67956d6ab518388fad6397cac8d log, sync: improve lock contention logging and add time duration (Jon Atack)
3f4c6b87f1098436693c4990f2082515ec0ece26 log, timer: add timing macro in usec LOG_TIME_MICROS_WITH_CATEGORY (Jon Atack)
b7a17444e0746c562ae97b26eba431577947b06a log, sync: add LOCK logging category, apply it to lock contention (Jon Atack)

Pull request description:

  To enable lock contention logging, `DEBUG_LOCKCONTENTION` has to be defined at compilation. Once built, the logging is not limited to a category and is high frequency, verbose and in all-caps. With these factors combined, it seems likely to be rarely used.

  This patch:
  - adds a `lock` logging category
  - adds a timing macro in microseconds, `LOG_TIME_MICROS_WITH_CATEGORY`
  - updates `BCLog::LogMsg()` to omit irrelevant decimals for microseconds and skip unneeded code and math
  - improves the lock contention logging, drops the all-caps, and displays the duration in microseconds
  - removes the conditional compilation directives
  - allows lock contentions to be logged on startup with `-debug=lock` or at run time with `bitcoin-cli logging '["lock"]'`

  ```
  $ bitcoind -signet -debug=lock
  2021-09-01T12:40:01Z LockContention: cs_vNodes, net.cpp:1920 started
  2021-09-01T12:40:01Z LockContention: cs_vNodes, net.cpp:1920 completed (4μs)
  2021-09-01T12:40:01Z LockContention: cs_vNodes, net.cpp:1302 started
  2021-09-01T12:40:01Z LockContention: cs_vNodes, net.cpp:1302 completed (4μs)
  2021-09-01T12:40:02Z LockContention: cs_vNodes, net.cpp:2242 started
  2021-09-01T12:40:02Z LockContention: cs_vNodes, net.cpp:2242 completed (20μs)
  2021-09-01T12:43:04Z LockContention: ::cs_main, validation.cpp:4980 started
  2021-09-01T12:43:04Z LockContention: ::cs_main, validation.cpp:4980 completed (3μs)

  $ bitcoin-cli -signet logging
    "lock": true,

  $ bitcoin-cli -signet logging [] '["lock"]'
    "lock": false,

  $ bitcoin-cli -signet logging '["lock"]'
    "lock": true,
  ```

  I've tested this with Clang 13 and GCC 10.2.1, on Debian, with and without `--enable-debug`.

ACKs for top commit:
  hebasto:
    re-ACK 7e698732836121912f179b7c743a72dd6fdffa72, added a contention duration to the log message since my [previous](https://github.com/bitcoin/bitcoin/pull/22736#pullrequestreview-743764606) review.
  theStack:
    re-ACK 7e698732836121912f179b7c743a72dd6fdffa72 🔏 ⏲️

Tree-SHA512: c4b5eb88d3a2c051acaa842b3055ce30efde1f114f61da6e55fcaa27476c1c33a60bc419f7f5ccda532e1bdbe70815222ec2b2b6d9226f29c8e94e598aacfee7
2024-04-02 12:09:35 -05:00
..
timer.h Merge bitcoin/bitcoin#22736: log, sync: change lock contention from preprocessor directive to log category 2024-04-02 12:09:35 -05:00