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Analysis: 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_enter_nowait() and if we did not get mutex do not update the stats. Fix: Use log_get_lsn_nowait() function on buf_flush_stat_update() function. If returned lsn is 0, we do not update flush stats. log_get_lsn_nowait() will use mutex_enter_nowait() and if we get mutex we return a correct lsn if not we return 0. |
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| .. | ||
| buf0buddy.c | ||
| buf0buf.c | ||
| buf0flu.c | ||
| buf0lru.c | ||
| buf0rea.c | ||