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MDEV-20612: Replace lock_sys.mutex with lock_sys.latch

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For now, we will acquire the lock_sys.latch only in exclusive mode,
that is, use it as a mutex.

This is preparation for the next commit where we will introduce
a less intrusive alternative, combining a shared lock_sys.latch
with dict_table_t::lock_mutex or a mutex embedded in
lock_sys.rec_hash, lock_sys.prdt_hash, or lock_sys.prdt_page_hash.
This commit is contained in:
Marko Mäkelä
2021-02-11 14:52:10 +02:00
parent 903464929c
commit b01d8e1a33
24 changed files with 344 additions and 281 deletions
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2
mysql-test/suite/perfschema/r/sxlock_func.result
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@@ -9,6 +9,7 @@ AND name!='wait/synch/rwlock/innodb/btr_search_latch' ORDER BY name;
name
wait/synch/rwlock/innodb/dict_operation_lock
wait/synch/rwlock/innodb/fil_space_latch
wait/synch/rwlock/innodb/lock_latch
wait/synch/rwlock/innodb/trx_i_s_cache_lock
wait/synch/rwlock/innodb/trx_purge_latch
TRUNCATE TABLE performance_schema.events_waits_history_long;
@@ -39,6 +40,7 @@ ORDER BY event_name;
event_name
wait/synch/rwlock/innodb/dict_operation_lock
wait/synch/rwlock/innodb/fil_space_latch
wait/synch/rwlock/innodb/lock_latch
SELECT event_name FROM performance_schema.events_waits_history_long
WHERE event_name = 'wait/synch/sxlock/innodb/index_tree_rw_lock'
AND operation IN ('try_shared_lock','shared_lock') LIMIT 1;