delta/mariadb-git.git - github.com: MariaDB/server.git

	Commit message (Collapse)	Author	Age	Files	Lines
*	MDEV-5864 - Reduce usage of LOCK_open: TABLE_SHARE::tdc.free_tables	Sergey Vojtovich	2014-03-20	1	-1/+0
\| \| \| \| \| \|	Let TABLE_SHARE::tdc.free_tables, TABLE_SHARE::tdc.all_tables, TABLE_SHARE::tdc.flushed and corresponding invariants be protected by per-share TABLE_SHARE::tdc.LOCK_table_share instead of global LOCK_open.
*	MDEV-5675 - Performance: my_hash_sort_bin is called too often	Sergey Vojtovich	2014-03-06	1	-2/+6
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Reduced number of my_hash_sort_bin() calls from 4 to 1 per query. Reduced number of memory accesses done by my_hash_sort_bin(). Details: - let MDL subsystem use pre-calculated hash value for hash inserts and deletes - let table cache use pre-calculated MDL hash value - MDL namespace is excluded from hash value calculation, so that hash value can be used by table cache as is - hash value for MDL is calculated as resulting hash value + MDL namespace - extended hash implementation to accept user defined hash function
*	MDEV-5492 - Reduce usage of LOCK_open: TABLE::in_use	Sergey Vojtovich	2014-02-13	1	-3/+4
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Move TABLE::in_use out of LOCK_open. This is done with assumtion that foreign threads accessing TABLE::in_use will only need consistent value _after_ marking table for flush and purging unused table instances. In this case TABLE::in_use will always point to a valid thread object. Previously FLUSH TABLES thread may wait for tables flushed subsequently by concurrent threads which breaks the above assumption, e.g.: open tables: t1 (version= 1) thr1 (FLUSH TABLES): refresh_version++ thr1 (FLUSH TABLES): purge table cache open tables: none thr2 (SELECT * FROM t1): open tables: t1 open tables: t1 (version= 2) thr2 (FLUSH TABLES): refresh_version++ thr2 (FLUSH TABLES): purge table cache thr1 (FLUSH TABLES): wait for old tables (including t1 with version 2) It is fixed so that FLUSH TABLES waits only for tables that were open heretofore.
*	MDEV-5388 - Reduce usage of LOCK_open: unused_tables	Sergey Vojtovich	2013-12-12	1	-1/+0
\| \| \| \|	Removed unused_tables, find LRU object by timestamp instead.
*	MDEV-4702 - Reduce usage of LOCK_open	Sergey Vojtovich	2013-08-14	1	-0/+134
	Following variables do not require LOCK_open protection anymore: - table_def_cache (renamed to tdc_hash) is protected by rw-lock LOCK_tdc_hash; - table_def_shutdown_in_progress doesn't need LOCK_open protection; - last_table_id use atomics; - TABLE_SHARE::ref_count (renamed to TABLE_SHARE::tdc.ref_count) is protected by TABLE_SHARE::tdc.LOCK_table_share; - TABLE_SHARE::next, ::prev (renamed to tdc.next and tdc.prev), oldest_unused_share, end_of_unused_share are protected by LOCK_unused_shares; - TABLE_SHARE::m_flush_tickets (renamed to tdc.m_flush_tickets) is protected by TABLE_SHARE::tdc.LOCK_table_share; - refresh_version (renamed to tdc_version) use atomics.