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MDEV-7728 - Improve xid cache scalability by using lock-free hash

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XID cache is now based on lock-free hash.
Also fixed lf_hash_destroy() to call alloc destructor.

Note that previous implementation had race condition when thread was accessing
XA owned by different thread. This new implementation doesn't fix it either.
This commit is contained in:
Sergey Vojtovich
2015-03-16 18:44:06 +04:00
parent 18e9c314e4
commit 6bd24deab4
13 changed files with 251 additions and 129 deletions
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4
mysql-test/suite/perfschema/r/setup_instruments_defaults.result
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@ -5,14 +5,14 @@ SELECT * FROM performance_schema.setup_instruments
WHERE name IN (
'wait/synch/mutex/sql/LOCK_user_conn',
'wait/synch/mutex/sql/LOCK_uuid_generator',
'wait/synch/mutex/sql/LOCK_xid_cache',
'wait/synch/mutex/sql/LOCK_plugin',
'stage/sql/creating table')
AND enabled = 'yes' AND timed = 'no'
ORDER BY name;
NAME ENABLED TIMED
stage/sql/creating table YES NO
wait/synch/mutex/sql/LOCK_plugin YES NO
wait/synch/mutex/sql/LOCK_user_conn YES NO
wait/synch/mutex/sql/LOCK_xid_cache YES NO
SELECT * FROM performance_schema.setup_instruments
WHERE name = 'wait/synch/mutex/sql/LOCK_thread_count'
AND enabled = 'no' AND timed = 'no';