InnoDB: Add configuration option innodb_autoextend_increment

innobase/include/srv0srv.h:
  Add srv_auto_extend_increment and make SRV_AUTO_EXTEND_INCREMENT
  configureable by it
innobase/srv/srv0srv.c:
  Add srv_auto_extend_increment
sql/ha_innodb.cc:
  Add innobase_auto_extend_increment and srv_auto_extend_increment
sql/ha_innodb.h:
  Add innobase_auto_extend_increment
sql/mysqld.cc:
  Add "innodb_autoextend_increment" configuration option

innobase/include/srv0srv.h

@@ -24,7 +24,8 @@ extern os_event_t	srv_lock_timeout_thread_event;
 
 /* If the last data file is auto-extended, we add this many pages to it
 at a time */
-#define SRV_AUTO_EXTEND_INCREMENT   (8 * ((1024 * 1024) / UNIV_PAGE_SIZE))
+#define SRV_AUTO_EXTEND_INCREMENT	\
+	(srv_auto_extend_increment * ((1024 * 1024) / UNIV_PAGE_SIZE))
 
 /* This is set to TRUE if the MySQL user has set it in MySQL */
 extern ibool	srv_lower_case_table_names;
@@ -51,6 +52,7 @@ extern ulint*   srv_data_file_is_raw_partition;
 
 extern ibool	srv_auto_extend_last_data_file;
 extern ulint	srv_last_file_size_max;
+extern ulint	srv_auto_extend_increment;
 
 extern ibool	srv_created_new_raw;
 

innobase/srv/srv0srv.c

@@ -92,6 +92,9 @@ ulint	srv_last_file_size_max	= 0;		 /* if != 0, this tells
 						 the max size auto-extending
 						 may increase the last data
 						 file size */
+ulint	srv_auto_extend_increment = 8;		 /* If the last data file is
+						 auto-extended, we add this
+						 many pages to it at a time */
 ulint*  srv_data_file_is_raw_partition = NULL;
 
 /* If the following is TRUE we do not allow inserts etc. This protects

sql/ha_innodb.cc

@@ -97,7 +97,7 @@ long innobase_mirrored_log_groups, innobase_log_files_in_group,
      innobase_buffer_pool_size, innobase_additional_mem_pool_size,
      innobase_file_io_threads, innobase_lock_wait_timeout,
      innobase_thread_concurrency, innobase_force_recovery,
-     innobase_open_files;
+     innobase_open_files, innobase_auto_extend_increment;
 
 /* The default values for the following char* start-up parameters
 are determined in innobase_init below: */
@@ -963,6 +963,7 @@ innobase_init(void)
         srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
 
 	srv_max_n_open_files = (ulint) innobase_open_files;
+	srv_auto_extend_increment = (ulint) innobase_auto_extend_increment;
 	srv_innodb_status = (ibool) innobase_create_status_file;
 
 	srv_print_verbose_log = mysql_embedded ? 0 : 1;

sql/ha_innodb.h

@@ -183,6 +183,7 @@ extern long innobase_buffer_pool_awe_mem_mb;
 extern long innobase_file_io_threads, innobase_lock_wait_timeout;
 extern long innobase_force_recovery, innobase_thread_concurrency;
 extern long innobase_open_files;
+extern long innobase_auto_extend_increment;
 extern char *innobase_data_home_dir, *innobase_data_file_path;
 extern char *innobase_log_group_home_dir, *innobase_log_arch_dir;
 extern char *innobase_unix_file_flush_method;

sql/mysqld.cc

@@ -3962,6 +3962,7 @@ enum options_mysqld
   OPT_INNODB_STATUS_FILE,
   OPT_INNODB_MAX_DIRTY_PAGES_PCT,
   OPT_INNODB_OPEN_FILES,
+  OPT_INNODB_AUTOEXTEND_INCREMENT,
   OPT_BDB_CACHE_SIZE,
   OPT_BDB_LOG_BUFFER_SIZE,
   OPT_BDB_MAX_LOCK,
@@ -4709,6 +4710,11 @@ replicating a LOAD DATA INFILE command.",
    "How many files at the maximum InnoDB keeps open at the same time.",
    (gptr*) &innobase_open_files, (gptr*) &innobase_open_files, 0,
    GET_LONG, REQUIRED_ARG, 300L, 10L, ~0L, 0, 1L, 0},
+  {"innodb_autoextend_increment", OPT_INNODB_AUTOEXTEND_INCREMENT,
+   "Data file autoextend increment in megabytes",
+   (gptr*) &innobase_auto_extend_increment,
+   (gptr*) &innobase_auto_extend_increment,
+   0, GET_LONG, REQUIRED_ARG, 8L, 1L, ~0L, 0, 1L, 0},
 #ifdef HAVE_REPLICATION
   /*
     Disabled for the 4.1.3 release. Disabling just this paragraph of code is