2013-03-25 23:03:13 +01:00
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/*****************************************************************************
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2017-10-25 20:35:33 +02:00
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Copyright (c) 2012, 2017, Oracle and/or its affiliates. All Rights Reserved.
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2022-04-19 12:49:52 +02:00
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Copyright (c) 2017, 2022, MariaDB Corporation.
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2013-03-25 23:03:13 +01:00
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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2019-05-11 18:25:02 +02:00
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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2013-03-25 23:03:13 +01:00
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*****************************************************************************/
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/**************************************************//**
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@file include/dict0stats_bg.h
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Code used for background table and index stats gathering.
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Created Apr 26, 2012 Vasil Dimov
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*******************************************************/
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#ifndef dict0stats_bg_h
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#define dict0stats_bg_h
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2016-08-12 10:17:45 +02:00
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#include "dict0types.h"
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2013-03-25 23:03:13 +01:00
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2016-08-12 10:17:45 +02:00
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#ifdef HAVE_PSI_INTERFACE
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2020-12-04 18:02:58 +01:00
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extern mysql_pfs_key_t recalc_pool_mutex_key;
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2016-08-12 10:17:45 +02:00
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#endif /* HAVE_PSI_INTERFACE */
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2021-08-31 12:54:55 +02:00
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/** Delete a table from the auto recalc pool, and ensure that
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no statistics are being updated on it. */
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void dict_stats_recalc_pool_del(table_id_t id, bool have_mdl_exclusive);
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MDEV-24258 Merge dict_sys.mutex into dict_sys.latch
In the parent commit, dict_sys.latch could theoretically have been
replaced with a mutex. But, we can do better and merge dict_sys.mutex
into dict_sys.latch. Generally, every occurrence of dict_sys.mutex_lock()
will be replaced with dict_sys.lock().
The PERFORMANCE_SCHEMA instrumentation for dict_sys_mutex
will be removed along with dict_sys.mutex. The dict_sys.latch
will remain instrumented as dict_operation_lock.
Some use of dict_sys.lock() will be replaced with dict_sys.freeze(),
which we will reintroduce for the new shared mode. Most notably,
concurrent table lookups are possible as long as the tables are present
in the dict_sys cache. In particular, this will allow more concurrency
among InnoDB purge workers.
Because dict_sys.mutex will no longer 'throttle' the threads that purge
InnoDB transaction history, a performance degradation may be observed
unless innodb_purge_threads=1.
The table cache eviction policy will become FIFO-like,
similar to what happened to fil_system.LRU
in commit 45ed9dd957eebc7fc84feb2509f4aa6baa908a95.
The name of the list dict_sys.table_LRU will become somewhat misleading;
that list contains tables that may be evicted, even though the
eviction policy no longer is least-recently-used but first-in-first-out.
(Note: Tables can never be evicted as long as locks exist on them or
the tables are in use by some thread.)
As demonstrated by the test perfschema.sxlock_func, there
will be less contention on dict_sys.latch, because some previous
use of exclusive latches will be replaced with shared latches.
fts_parse_sql_no_dict_lock(): Replaced with pars_sql().
fts_get_table_name_prefix(): Merged to fts_optimize_create().
dict_stats_update_transient_for_index(): Deduplicated some code.
ha_innobase::info_low(), dict_stats_stop_bg(): Use a combination
of dict_sys.latch and table->stats_mutex_lock() to cover the
changes of BG_STAT_SHOULD_QUIT, because the flag is being read
in dict_stats_update_persistent() while not holding dict_sys.latch.
row_discard_tablespace_for_mysql(): Protect stats_bg_flag by
exclusive dict_sys.latch, like most other code does.
row_quiesce_table_has_fts_index(): Remove unnecessary mutex
acquisition. FLUSH TABLES...FOR EXPORT is protected by MDL.
row_import::set_root_by_heuristic(): Remove unnecessary mutex
acquisition. ALTER TABLE...IMPORT TABLESPACE is protected by MDL.
row_ins_sec_index_entry_low(): Replace a call
to dict_set_corrupted_index_cache_only(). Reads of index->type
were not really protected by dict_sys.mutex, and writes
(flagging an index corrupted) should be extremely rare.
dict_stats_process_entry_from_defrag_pool(): Only freeze the dictionary,
do not lock it exclusively.
dict_stats_wait_bg_to_stop_using_table(), DICT_BG_YIELD: Remove trx.
We can simply invoke dict_sys.unlock() and dict_sys.lock() directly.
dict_acquire_mdl_shared()<trylock=false>: Assert that dict_sys.latch is
only held in shared more, not exclusive mode. Only acquire it in
exclusive mode if the table needs to be loaded to the cache.
dict_sys_t::acquire(): Remove. Relocating elements in dict_sys.table_LRU
would require holding an exclusive latch, which we want to avoid
for performance reasons.
dict_sys_t::allow_eviction(): Add the table first to dict_sys.table_LRU,
to compensate for the removal of dict_sys_t::acquire(). This function
is only invoked by INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS.
dict_table_open_on_id(), dict_table_open_on_name(): If dict_locked=false,
try to acquire dict_sys.latch in shared mode. Only acquire the latch in
exclusive mode if the table is not found in the cache.
Reviewed by: Thirunarayanan Balathandayuthapani
2021-08-31 12:51:35 +02:00
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2013-03-25 23:03:13 +01:00
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/*****************************************************************//**
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Initialize global variables needed for the operation of dict_stats_thread().
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2019-10-29 22:37:12 +01:00
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Must be called before dict_stats task is started. */
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2019-11-13 18:14:44 +01:00
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void dict_stats_init();
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2013-03-25 23:03:13 +01:00
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/*****************************************************************//**
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Free resources allocated by dict_stats_thread_init(), must be called
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2019-10-29 22:37:12 +01:00
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after dict_stats task has exited. */
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2019-11-13 18:14:44 +01:00
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void dict_stats_deinit();
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2013-03-25 23:03:13 +01:00
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2019-11-13 18:14:44 +01:00
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/** Start the dict stats timer. */
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void dict_stats_start();
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2019-10-29 22:37:12 +01:00
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/** Shut down the dict_stats timer. */
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2019-11-13 18:14:44 +01:00
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void dict_stats_shutdown();
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2016-09-06 08:43:16 +02:00
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2019-11-13 18:14:44 +01:00
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/** Reschedule dict stats timer to run now. */
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void dict_stats_schedule_now();
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2019-10-29 22:37:12 +01:00
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2013-03-25 23:03:13 +01:00
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#endif /* dict0stats_bg_h */
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