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InnoDB 1.1 for MySQL 5.5 User's Guide
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7.22. Separate Flush List Mutex

Starting with InnoDB 1.1 with MySQL 5.5, concurrent access to the buffer pool is faster. Operations involving the flush list, a data structure related to the buffer pool, are now controlled by a separate mutex and do not block access to the buffer pool. You do not need to configure anything to take advantage of this speedup; it is fully automatic.

For more information about the InnoDB buffer pool, see The InnoDB Buffer Pool.

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