recv_recovery_is_on(): Add UNIV_UNLIKELY

Normally, InnoDB is not in the process of executing crash recovery.
Provide a hint to the compiler that the recovery-related code paths
are rarely executed.

storage/innobase/buf/buf0rea.cc

 /*****************************************************************************
 
 Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2015, 2018, MariaDB Corporation.
+Copyright (c) 2015, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -186,13 +186,13 @@ buf_read_page_low(
 		thd_wait_end(NULL);
 	}
 
-	if (*err != DB_SUCCESS) {
+	if (UNIV_UNLIKELY(*err != DB_SUCCESS)) {
 		if (*err == DB_TABLESPACE_TRUNCATED) {
 			/* Remove the page which is outside the
 			truncated tablespace bounds when recovering
 			from a crash happened during a truncation */
 			buf_read_page_handle_error(bpage);
-			if (recv_recovery_on) {
+			if (recv_recovery_is_on()) {
 				mutex_enter(&recv_sys->mutex);
 				ut_ad(recv_sys->n_addrs > 0);
 				recv_sys->n_addrs--;

storage/innobase/fil/fil0fil.cc

@@ -1310,9 +1310,7 @@ fil_space_free(
 			rw_lock_x_unlock(&space->latch);
 		}
 
-		bool	need_mutex = !recv_recovery_on;
-
-		if (need_mutex) {
+		if (!recv_recovery_is_on()) {
 			log_mutex_enter();
 		}
 
@@ -1323,7 +1321,7 @@ fil_space_free(
 			UT_LIST_REMOVE(fil_system->named_spaces, space);
 		}
 
-		if (need_mutex) {
+		if (!recv_recovery_is_on()) {
 			log_mutex_exit();
 		}
 
@@ -1394,7 +1392,7 @@ fil_space_create(
 	UT_LIST_INIT(space->chain, &fil_node_t::chain);
 
 	if ((purpose == FIL_TYPE_TABLESPACE || purpose == FIL_TYPE_IMPORT)
-	    && !recv_recovery_on
+	    && !recv_recovery_is_on()
 	    && id > fil_system->max_assigned_id) {
 
 		if (!fil_system->space_id_reuse_warned) {
@@ -3493,7 +3491,7 @@ fil_rename_tablespace(
 	ut_ad(strchr(old_file_name, OS_PATH_SEPARATOR) != NULL);
 	ut_ad(strchr(new_file_name, OS_PATH_SEPARATOR) != NULL);
 
-	if (!recv_recovery_on) {
+	if (!recv_recovery_is_on()) {
 		fil_name_write_rename(id, old_file_name, new_file_name);
 		log_mutex_enter();
 	}
@@ -3518,7 +3516,7 @@ fil_rename_tablespace(
 		node->name = new_file_name;
 	}
 
-	if (!recv_recovery_on) {
+	if (!recv_recovery_is_on()) {
 		log_mutex_exit();
 	}
 

storage/innobase/include/fil0fil.h

 /*****************************************************************************
 
 Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2013, 2018, MariaDB Corporation.
+Copyright (c) 2013, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -1444,16 +1444,12 @@ fil_names_write_if_was_clean(
 	return(was_clean);
 }
 
-extern volatile bool	recv_recovery_on;
-
 /** During crash recovery, open a tablespace if it had not been opened
 yet, to get valid size and flags.
 @param[in,out]	space	tablespace */
-inline
-void
-fil_space_open_if_needed(
-	fil_space_t*	space)
+inline void fil_space_open_if_needed(fil_space_t* space)
 {
+	ut_d(extern volatile bool recv_recovery_on);
 	ut_ad(recv_recovery_on);
 
 	if (space->size == 0) {
@@ -1461,10 +1457,7 @@ fil_space_open_if_needed(
 		until the files are opened for the first time.
 		fil_space_get_size() will open the file
 		and adjust the size and flags. */
-#ifdef UNIV_DEBUG
-		ulint		size	=
-#endif /* UNIV_DEBUG */
-			fil_space_get_size(space->id);
+		ut_d(ulint size	=) fil_space_get_size(space->id);
 		ut_ad(size == space->size);
 	}
 }

storage/innobase/include/log0recv.h

 /*****************************************************************************
 
 Copyright (c) 1997, 2016, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, 2018, MariaDB Corporation.
+Copyright (c) 2017, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -40,7 +40,7 @@ Created 9/20/1997 Heikki Tuuri
 extern bool	recv_writer_thread_active;
 
 /** @return whether recovery is currently running. */
-#define recv_recovery_is_on() recv_recovery_on
+#define recv_recovery_is_on() UNIV_UNLIKELY(recv_recovery_on)
 
 /** Find the latest checkpoint in the log header.
 @param[out]	max_field	LOG_CHECKPOINT_1 or LOG_CHECKPOINT_2

storage/innobase/log/log0log.cc

@@ -2,7 +2,7 @@
 
 Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2009, Google Inc.
-Copyright (c) 2014, 2018, MariaDB Corporation.
+Copyright (c) 2014, 2019, MariaDB Corporation.
 
 Portions of this file contain modifications contributed and copyrighted by
 Google, Inc. Those modifications are gratefully acknowledged and are described
@@ -1378,14 +1378,11 @@ synchronization objects!
 this lsn
 @return false if there was a flush batch of the same type running,
 which means that we could not start this flush batch */
-static
-bool
-log_preflush_pool_modified_pages(
-	lsn_t			new_oldest)
+static bool log_preflush_pool_modified_pages(lsn_t new_oldest)
 {
 	bool	success;
 
-	if (recv_recovery_on) {
+	if (recv_recovery_is_on()) {
 		/* If the recovery is running, we must first apply all
 		log records to their respective file pages to get the
 		right modify lsn values to these pages: otherwise, there

storage/innobase/log/log0recv.cc

@@ -673,7 +673,7 @@ DECLARE_THREAD(recv_writer_thread)(
 
 		mutex_enter(&recv_sys->writer_mutex);
 
-		if (!recv_recovery_on) {
+		if (!recv_recovery_is_on()) {
 			mutex_exit(&recv_sys->writer_mutex);
 			break;
 		}
@@ -766,7 +766,7 @@ recv_sys_debug_free(void)
 
 	/* wake page cleaner up to progress */
 	if (!srv_read_only_mode) {
-		ut_ad(!recv_recovery_on);
+		ut_ad(!recv_recovery_is_on());
 		ut_ad(!recv_writer_thread_active);
 		os_event_reset(buf_flush_event);
 		os_event_set(recv_sys->flush_start);