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Maintain connection_count atomically

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Removed LOCK_connection_count.

Removed duplicate denied_connections and connection_errors_max_connection
increment from create_new_thread(). Another increment done by
CONNECT::close_with_error().

Simplified away CONNECT::thread_count_incremented. Now close_with_error()
is always called with connection_count incremented.

Part of MDEV-19515 - Improve connect speed
This commit is contained in:
Sergey Vojtovich
2019-05-19 17:00:31 +04:00
parent 0bee021b78
commit a61baa7a25
21 changed files with 31 additions and 1628 deletions
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3
mysql-test/suite/perfschema/include/event_aggregate_load.inc
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@@ -27,9 +27,6 @@ execute dump_hosts;
# Notes about this test
#
# Each connect causes 2 wait/synch/mutex/sql/LOCK_connection_count events:
# - 1 in mysqld.cc, create_new_thread(), for the main thread
# - 1 in sql_connect.cc, check_user(), for the connected thread
# The main thread does not count for BY_ACCOUNT / BY_HOST.
# The user thread does count for BY_ACCOUNT, BY_HOST
#