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Posted by Luke Matthews on August 13 2015 6:07pm[Delete] [Edit]

Defaults for performance_schema=off changed to 'on' at 5.6.6.
As result, this leads to higher memory consumption by mysqld (+400Mb RSS used).

http://dev.mysql.com/doc/refman/5.6/en/performance-schema-system-variables.html#sysvar_performance_schema

Also see http://stackoverflow.com/questions/19570181/percona-5-6-high-memory-usage