MDEV-17003 service_manager_extend_timeout() being called too often

buf_dump(): Only generate the output when shutdown is in progress.

log_write_up_to(): Only generate the output before actually writing
to the redo log files.

srv_purge_should_exit(): Rate-limit the output, and instead of
displaying the work done, indicate the work that remains to be done
until the completion of the slow shutdown.

storage/innobase/buf/buf0dump.cc

 /*****************************************************************************
 
 Copyright (c) 2011, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, MariaDB Corporation. All Rights Reserved.
+Copyright (c) 2017, 2018, 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
@@ -334,7 +334,7 @@ buf_dump(
 					i + 1, srv_buf_pool_instances,
 					j + 1, n_pages);
 			}
-			if ( (j % 1024) == 0) {
+			if (SHUTTING_DOWN() && !(j % 1024)) {
 				service_manager_extend_timeout(INNODB_EXTEND_TIMEOUT_INTERVAL,
 					"Dumping buffer pool "
 					ULINTPF "/" ULINTPF ", "

storage/innobase/log/log0log.cc

@@ -1443,12 +1443,6 @@ log_write_up_to(
 		return;
 	}
 
-	if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
-		service_manager_extend_timeout(INNODB_EXTEND_TIMEOUT_INTERVAL,
-					       "log write up to: " LSN_PF,
-					       lsn);
-	}
-
 loop:
 	ut_ad(++loop_count < 100);
 
@@ -1561,6 +1555,13 @@ log_write_up_to(
 	log_sys->buf_free += OS_FILE_LOG_BLOCK_SIZE;
 	log_sys->write_end_offset = log_sys->buf_free;
 
+	if (UNIV_UNLIKELY(srv_shutdown_state != SRV_SHUTDOWN_NONE)) {
+		service_manager_extend_timeout(INNODB_EXTEND_TIMEOUT_INTERVAL,
+					       "InnoDB log write: "
+					       LSN_PF "," LSN_PF,
+					       log_sys->write_lsn, lsn);
+	}
+
 	group = UT_LIST_GET_FIRST(log_sys->log_groups);
 
 	/* Do the write to the log files */

storage/innobase/srv/srv0srv.cc

@@ -2542,9 +2542,17 @@ srv_purge_should_exit(ulint n_purged)
 	}
 	/* Slow shutdown was requested. */
 	if (n_purged) {
-		service_manager_extend_timeout(
-			INNODB_EXTEND_TIMEOUT_INTERVAL,
-			"InnoDB " ULINTPF " pages purged", n_purged);
+#if defined HAVE_SYSTEMD && !defined EMBEDDED_LIBRARY
+		static ib_time_t progress_time;
+		ib_time_t time = ut_time();
+		if (time - progress_time >= 15) {
+			progress_time = time;
+			service_manager_extend_timeout(
+				INNODB_EXTEND_TIMEOUT_INTERVAL,
+				"InnoDB: to purge " ULINTPF " transactions",
+				trx_sys->rseg_history_len);
+		}
+#endif
 		/* The previous round still did some work. */
 		return(false);
 	}

storage/xtradb/buf/buf0dump.cc

 /*****************************************************************************
 
 Copyright (c) 2011, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, MariaDB Corporation. All Rights Reserved.
+Copyright (c) 2017, 2018, 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
@@ -334,7 +334,7 @@ buf_dump(
 					i + 1, srv_buf_pool_instances,
 					j + 1, n_pages);
 			}
-			if ( (j % 1024) == 0) {
+			if (SHUTTING_DOWN() && !(j % 1024)) {
 				service_manager_extend_timeout(INNODB_EXTEND_TIMEOUT_INTERVAL,
 					"Dumping buffer pool "
 					ULINTPF "/" ULINTPF ", "

storage/xtradb/log/log0log.cc

@@ -1561,12 +1561,6 @@ log_write_up_to(
 		return;
 	}
 
-	if (srv_shutdown_state != SRV_SHUTDOWN_NONE) {
-		service_manager_extend_timeout(INNODB_EXTEND_TIMEOUT_INTERVAL,
-					       "log write up to: " LSN_PF,
-					       lsn);
-	}
-
 loop:
 	ut_ad(++loop_count < 100);
 
@@ -1679,6 +1673,13 @@ log_write_up_to(
 	log_sys->buf_free += OS_FILE_LOG_BLOCK_SIZE;
 	log_sys->write_end_offset = log_sys->buf_free;
 
+	if (UNIV_UNLIKELY(srv_shutdown_state != SRV_SHUTDOWN_NONE)) {
+		service_manager_extend_timeout(INNODB_EXTEND_TIMEOUT_INTERVAL,
+					       "InnoDB log write: "
+					       LSN_PF "," LSN_PF,
+					       log_sys->write_lsn, lsn);
+	}
+
 	group = UT_LIST_GET_FIRST(log_sys->log_groups);
 
 	/* Do the write to the log files */

storage/xtradb/srv/srv0srv.cc

@@ -3236,9 +3236,17 @@ srv_purge_should_exit(ulint n_purged)
 	}
 	/* Slow shutdown was requested. */
 	if (n_purged) {
-		service_manager_extend_timeout(
-			INNODB_EXTEND_TIMEOUT_INTERVAL,
-			"InnoDB " ULINTPF " pages purged", n_purged);
+#if defined HAVE_SYSTEMD && !defined EMBEDDED_LIBRARY
+		static ib_time_t progress_time;
+		ib_time_t time = ut_time();
+		if (time - progress_time >= 15) {
+			progress_time = time;
+			service_manager_extend_timeout(
+				INNODB_EXTEND_TIMEOUT_INTERVAL,
+				"InnoDB: to purge " ULINTPF " transactions",
+				trx_sys->rseg_history_len);
+		}
+#endif
 		/* The previous round still did some work. */
 		return(false);
 	}