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  1. MariaDB Server
  2. MDEV-7100

InnoDB error monitor might unnecessary wait log_sys mutex

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      InnoDB error monitor is responsible to call every second
      sync_arr_wake_threads_if_sema_free() to wake up possible hanging threads if they are missed in mutex_signal_object.

      This is not possible if error monitor itself is on mutex/semaphore wait. We should avoid all unnecessary mutex/semaphore waits on error monitor.

      Currently error monitor calls function buf_flush_stat_update() that calls log_get_lsn() function and there we will try to get log_sys mutex. Better, solution for error monitor is that in buf_flush_stat_update() we will try to get lsn with mutex_nowait() and if we did not get mutex do not update the stats.

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            • Assignee:
              jplindst Jan Lindström
              Reporter:
              jplindst Jan Lindström
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