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The 0001-HASH-TABLE-LOCKS-OPT.patch reduce contention on hash_table_locks.
The 0001-UNDO-SPACES-LOCK-OPT.patch reduce contention on undo_spaces_lock.
The 0002-UNDO-SPACES-LOCK-OPT.AFTER-SCHED-AFFINITY.patch is the same as 0001-UNDO-SPACES-LOCK-OPT.patch execpt it has resolved confliction with 0001-SCHED-AFFINITY.patch.
The 0001-THREAD_POOL.patch provides thread pool feature, that enables MySQL to serve a large number of client connections while keeping a good perfomance.