[MDEV-6934] os_event_wait_time_low(): wait time calculation is messed up Created: 2014-10-24  Updated: 2014-10-24  Resolved: 2014-10-24

Status: Closed
Project: MariaDB Server
Component/s: Storage Engine - InnoDB, Storage Engine - XtraDB
Affects Version/s: 10.0.14
Fix Version/s: 10.0.15

Type: Bug Priority: Trivial
Reporter: Jan Lindström (Inactive) Assignee: Jan Lindström (Inactive)
Resolution: Fixed Votes: 0
Labels: innodb, xtradb

Issue Links:
PartOf
is part of MDEV-6039 WebScaleSQL patches Closed

 Description   

http://bugs.mysql.com/bug.php?id=72520

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.

 Comments   
Comment by Jan Lindström (Inactive) [ 2014-10-24 ]

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.

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