We have been using SHOW ENGINE INNODB MUTEX command for years. It shows us mutex and rw-lock information that could be useful during service troubleshooting in case of performance problems. As Morgan Tocker announced in his blog post the command will be removed from MySQL 5.7 and we have to use performance_schema to get that [&]

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http://www.percona.com/blog/2015/01/06/getting-mutex-information-from-mysqls-performance_schema/