optimize hash table locks.

Author: wjunLu

storage/innobase/handler/ha_innodb.cc

@@ -22537,13 +22537,11 @@ static MYSQL_SYSVAR_ULONGLONG(
     ulonglong{srv_buf_pool_chunk_unit_max},
     ulonglong{srv_buf_pool_chunk_unit_blk_sz});
 
-#if defined UNIV_DEBUG || defined UNIV_PERF_DEBUG
 static MYSQL_SYSVAR_ULONG(page_hash_locks, srv_n_page_hash_locks,
                           PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
                           "Number of rw_locks protecting buffer pool "
                           "page_hash. Rounded up to the next power of 2",
                           nullptr, nullptr, 16, 1, MAX_PAGE_HASH_LOCKS, 0);
-#endif /* defined UNIV_DEBUG || defined UNIV_PERF_DEBUG */
 
 static MYSQL_SYSVAR_BOOL(
     validate_tablespace_paths, srv_validate_tablespace_paths,
@@ -23588,9 +23586,7 @@ static SYS_VAR *innobase_system_variables[] = {
     MYSQL_SYSVAR(merge_threshold_set_all_debug),
     MYSQL_SYSVAR(semaphore_wait_timeout_debug),
 #endif /* UNIV_DEBUG */
-#if defined UNIV_DEBUG || defined UNIV_PERF_DEBUG
     MYSQL_SYSVAR(page_hash_locks),
-#endif /* defined UNIV_DEBUG || defined UNIV_PERF_DEBUG */
     MYSQL_SYSVAR(validate_tablespace_paths),
     MYSQL_SYSVAR(use_fdatasync),
     MYSQL_SYSVAR(status_output),

storage/innobase/include/buf0buf.h

@@ -111,7 +111,7 @@ constexpr ulint MAX_BUFFER_POOLS = (1 << MAX_BUFFER_POOLS_BITS);
 #define BUF_POOL_WATCH_SIZE (srv_n_purge_threads + 1)
 
 /** The maximum number of page_hash locks */
-constexpr ulint MAX_PAGE_HASH_LOCKS = 1024;
+constexpr ulint MAX_PAGE_HASH_LOCKS = 1048576;
 
 /** The buffer pools of the database */
 extern buf_pool_t *buf_pool_ptr;