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| author | Vladislav Vaintroub <wlad@mariadb.com> | 2020-07-08 17:38:59 +0200 |
|---|---|---|
| committer | Vladislav Vaintroub <wlad@mariadb.com> | 2020-07-14 11:16:24 +0200 |
| commit | 1a2b494100e5a81c8ac568899d66884b9936cf98 (patch) | |
| tree | 112d70b6876543706bd87deea4fec006ec400815 /sql/mysqld.h | |
| parent | 7148b846738412517bf4998128ba66a277721630 (diff) | |
| download | mariadb-git-1a2b494100e5a81c8ac568899d66884b9936cf98.tar.gz | |
MDEV-23124 Eliminate the overhead of system call access() on every USE(or connection)
Make check_db_dir_existence() use a cache of existing directories
clear the cache whenever any directory is removed.
With this, the cost of check_db_dir_existence() will usually be a cost of
acquiring/releasing a non-contended readwrite lock in shared mode,
much less than going to the kernel and filesystem to check for file existence
Diffstat (limited to 'sql/mysqld.h')
| -rw-r--r-- | sql/mysqld.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/mysqld.h b/sql/mysqld.h index 6f0db56d309..fda3a7d2ef9 100644 --- a/sql/mysqld.h +++ b/sql/mysqld.h @@ -502,6 +502,7 @@ extern PSI_memory_key key_memory_TABLE; extern PSI_memory_key key_memory_binlog_statement_buffer; extern PSI_memory_key key_memory_user_conn; extern PSI_memory_key key_memory_dboptions_hash; +extern PSI_memory_key key_memory_dbnames_cache; extern PSI_memory_key key_memory_hash_index_key_buffer; extern PSI_memory_key key_memory_THD_handler_tables_hash; extern PSI_memory_key key_memory_JOIN_CACHE; |