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MDEV-24731 Excessive mutex contention in DeadlockChecker::check_and_resolve()

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The DeadlockChecker expects to be able to freeze the waits-for graph.
Hence, it is best executed somewhere where we are not holding any
additional mutexes.

lock_wait(): Defer the deadlock check to this function, instead
of executing it in lock_rec_enqueue_waiting(), lock_table_enqueue_waiting().

DeadlockChecker::trx_rollback(): Merge with the only caller,
check_and_resolve().

LockMutexGuard: RAII accessor for lock_sys.mutex.

lock_sys.deadlocks: Replaces lock_deadlock_found.

trx_t: Clean up some comments.
This commit is contained in:
Marko Mäkelä
2021-02-04 16:38:07 +02:00
parent 43ca6059ca
commit 5f46385764
14 changed files with 453 additions and 571 deletions
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2
mysql-test/suite/innodb/r/innodb_skip_innodb_is_tables.result
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@ -39,7 +39,7 @@ NAME SUBSYSTEM COUNT MAX_COUNT MIN_COUNT AVG_COUNT COUNT_RESET MAX_COUNT_RESET M
metadata_table_handles_opened metadata 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Number of table handles opened
metadata_table_handles_closed metadata 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Number of table handles closed
metadata_table_reference_count metadata 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Table reference counter
lock_deadlocks lock 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Number of deadlocks
lock_deadlocks lock 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 value Number of deadlocks
lock_timeouts lock 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Number of lock timeouts
lock_rec_lock_waits lock 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Number of times enqueued into record lock wait queue
lock_table_lock_waits lock 0 NULL NULL NULL 0 NULL NULL NULL NULL NULL NULL NULL 0 counter Number of times enqueued into table lock wait queue