Marko Mäkelä 8d16da1487 MDEV-24789: Reduce lock_sys mutex contention further ... lock_sys_t::deadlock_check(): Assume that only lock_sys.wait_mutex is being held by the caller. lock_sys_t::rd_lock_try(): New function. lock_sys_t::cancel(trx_t*): Kill an active transaction that may be holding a lock. lock_sys_t::cancel(trx_t*, lock_t*): Cancel a waiting lock request. lock_trx_handle_wait(): Avoid acquiring mutexes in some cases, and in never acquire lock_sys.latch in exclusive mode. This function is only invoked in a semi-consistent read (locking a clustered index record only if it matches the search condition). Normally, lock_wait() will take care of lock waits. lock_wait(): Invoke the new function lock_sys_t::cancel() at the end, to avoid acquiring exclusive lock_sys.latch. lock_rec_other_trx_holds_expl(): Use LockGuard instead of LockMutexGuard. lock_release_autoinc_locks(): Explicitly acquire table->lock_mutex, in case only a shared lock_sys.latch is being held. Deadlock::report() will still hold exclusive lock_sys.latch while invoking lock_cancel_waiting_and_release(). lock_cancel_waiting_and_release(): Acquire trx->mutex in this function, instead of expecting the caller to do so. lock_unlock_table_autoinc(): Only acquire shared lock_sys.latch. lock_table_has_locks(): Do not acquire lock_sys.latch at all. Deadlock::check_and_resolve(): Only acquire shared lock_sys.latchm for invoking lock_sys_t::cancel(trx, wait_lock). innobase_query_caching_table_check_low(), row_drop_tables_for_mysql_in_background(): Do not acquire lock_sys.latch.		2021-03-02 14:26:33 +02:00
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lock0iter.cc	MDEV-20612: Replace lock_sys.mutex with lock_sys.latch	2021-02-11 14:52:10 +02:00
lock0lock.cc	MDEV-24789: Reduce lock_sys mutex contention further	2021-03-02 14:26:33 +02:00
lock0prdt.cc	MDEV-20612 fixup: Reduce hash table lookups	2021-02-24 14:47:42 +02:00