Jan Lindström (Inactive) added a comment - 2014-10-24 17:13 revno: 4454 committer: Jan Lindström <jplindst@mariadb.org> branch nick: 10.0-innodb timestamp: Fri 2014-10-24 17:11:09 +0300 message: MDEV-6934 : os_event_wait_time_low(): wait time calculation is messed up Merged Facebook commit bdab302a7e3c37da21a1bffe1550cdbe6c906695 by Inaam Rana from https://github.com/facebook/mysql-5.6 . In os_event_wait_time_low() the logic to calculate abs_time for wait is broken. The bug has been present at least since 5.5. It gets acutely sensitized when sub-second wait intervals are passed. It is particularly relevant to us because the page_cleaner thread will mostly request sub-second wait intervals. This can potentially lead to a near tight loop behaviour of page_cleaner with much less sleep then what we'd actually expect.