------------------------------------------------------------
revno: 8780
committer: Laurynas Biveinis <laurynas.biveinis@percona.com>
branch nick: mysql-5.7-percona-patches
timestamp: Tue 2014-11-25 12:24:36 +0200
message:
  Fix bug http://bugs.mysql.com/bug.php?id=69146 (Needless log flush
  order mutex acquisition in buf_pool_get_oldest_modification) by
  removing the redundant locking.
diff:
=== modified file 'storage/innobase/buf/buf0buf.cc'
--- storage/innobase/buf/buf0buf.cc	2014-08-26 16:53:24 +0000
+++ storage/innobase/buf/buf0buf.cc	2014-11-25 10:24:36 +0000
@@ -358,10 +358,6 @@
 	lsn_t		lsn = 0;
 	lsn_t		oldest_lsn = 0;
 
-	/* When we traverse all the flush lists we don't want another
-	thread to add a dirty page to any flush list. */
-	log_flush_order_mutex_enter();
-
 	for (ulint i = 0; i < srv_buf_pool_instances; i++) {
 		buf_pool_t*	buf_pool;
 
@@ -393,8 +389,6 @@
 		}
 	}
 
-	log_flush_order_mutex_exit();
-
 	/* The returned answer may be out of date: the flush_list can
 	change after the mutex has been released. */