# name       : innodb_io_patches.patch
# introduced : 11 or before
# maintainer : Yasufumi
#
#!!! notice !!!
# Any small change to this file in the main branch
# should be done or reviewed by the maintainer!
--- a/storage/innobase/buf/buf0buf.c
+++ b/storage/innobase/buf/buf0buf.c
@@ -320,6 +320,7 @@
 
 	/* When we traverse all the flush lists we don't want another
 	thread to add a dirty page to any flush list. */
+	if (srv_buf_pool_instances > 1)
 	log_flush_order_mutex_enter();
 
 	for (i = 0; i < srv_buf_pool_instances; i++) {
@@ -343,6 +344,7 @@
 		}
 	}
 
+	if (srv_buf_pool_instances > 1)
 	log_flush_order_mutex_exit();
 
 	/* The returned answer may be out of date: the flush_list can
--- a/storage/innobase/buf/buf0flu.c
+++ b/storage/innobase/buf/buf0flu.c
@@ -857,7 +857,7 @@
 flush:
 	/* Now flush the doublewrite buffer data to disk */
 
-	fil_flush(TRX_SYS_SPACE);
+	fil_flush(TRX_SYS_SPACE, FALSE);
 
 	/* We know that the writes have been flushed to disk now
 	and in recovery we will find them in the doublewrite buffer
@@ -1375,10 +1375,11 @@
 	ulint		high;
 	ulint		count = 0;
 	buf_pool_t*	buf_pool = buf_pool_get(space, offset);
+	ibool		is_forward_scan;
 
 	ut_ad(flush_type == BUF_FLUSH_LRU || flush_type == BUF_FLUSH_LIST);
 
-	if (UT_LIST_GET_LEN(buf_pool->LRU) < BUF_LRU_OLD_MIN_LEN) {
+	if (UT_LIST_GET_LEN(buf_pool->LRU) < BUF_LRU_OLD_MIN_LEN || !srv_flush_neighbor_pages) {
 		/* If there is little space, it is better not to flush
 		any block except from the end of the LRU list */
 
@@ -1405,7 +1406,32 @@
 		high = fil_space_get_size(space);
 	}
 
-	for (i = low; i < high; i++) {
+	if (srv_flush_neighbor_pages == 2) {
+
+		/* In the case of contiguous flush where the requested page
+		does not fall at the start of flush area, first scan backward
+		from the page and later forward from it. */
+		is_forward_scan = (offset == low);
+	}
+	else {
+		is_forward_scan = TRUE;
+	}
+
+scan:
+	if (srv_flush_neighbor_pages == 2) {
+		if (is_forward_scan) {
+			i = offset;
+		}
+		else {
+			i = offset - 1;
+		}
+	}
+	else {
+		i = low;
+	}
+
+	for (; is_forward_scan ? (i < high) : (i >= low);
+	     is_forward_scan ? i++ : i--) {
 
 		buf_page_t*	bpage;
 
@@ -1434,6 +1460,12 @@
 		if (!bpage) {
 
 			buf_pool_mutex_exit(buf_pool);
+			if (srv_flush_neighbor_pages == 2) {
+
+				/* This is contiguous neighbor page flush and
+				the pages here are not contiguous. */
+				break;
+			}
 			continue;
 		}
 
@@ -1470,6 +1502,22 @@
 			}
 		}
 		buf_pool_mutex_exit(buf_pool);
+
+		if (srv_flush_neighbor_pages == 2) {
+
+			/* We are trying to do the contiguous neighbor page
+			flush, but the last page we checked was unflushable,
+			making a "hole" in the flush, so stop this attempt. */
+			break;
+		}
+	}
+
+	if (!is_forward_scan) {
+
+		/* Backward scan done, now do the forward scan */
+		ut_a (srv_flush_neighbor_pages == 2);
+		is_forward_scan = TRUE;
+		goto scan;
 	}
 
 	return(count);
@@ -1940,6 +1988,22 @@
 
 		buf_pool = buf_pool_from_array(i);
 
+		if (lsn_limit != IB_ULONGLONG_MAX) {
+			buf_page_t*	bpage;
+
+			buf_flush_list_mutex_enter(buf_pool);
+			bpage = UT_LIST_GET_LAST(buf_pool->flush_list);
+			if (!bpage
+			    || bpage->oldest_modification >= lsn_limit) {
+
+				buf_flush_list_mutex_exit(buf_pool);
+				continue;
+			} else {
+
+				buf_flush_list_mutex_exit(buf_pool);
+			}
+		}
+
 		if (!buf_flush_start(buf_pool, BUF_FLUSH_LIST)) {
 			/* We have two choices here. If lsn_limit was
 			specified then skipping an instance of buffer
--- a/storage/innobase/buf/buf0rea.c
+++ b/storage/innobase/buf/buf0rea.c
@@ -427,6 +427,10 @@
 		= BUF_READ_AHEAD_AREA(buf_pool);
 	ulint		threshold;
 
+	if (!(srv_read_ahead & 2)) {
+		return(0);
+	}
+
 	if (UNIV_UNLIKELY(srv_startup_is_before_trx_rollback_phase)) {
 		/* No read-ahead to avoid thread deadlocks */
 		return(0);
--- a/storage/innobase/fil/fil0fil.c
+++ b/storage/innobase/fil/fil0fil.c
@@ -2609,7 +2609,7 @@
 
 		os_thread_sleep(20000);
 
-		fil_flush(id);
+		fil_flush(id, TRUE);
 
 		goto retry;
 
@@ -2823,7 +2823,7 @@
 		goto error_exit;
 	}
 
-	ret = os_file_flush(file);
+	ret = os_file_flush(file, TRUE);
 
 	if (!ret) {
 		fputs("InnoDB: Error: file flush of tablespace ", stderr);
@@ -3009,7 +3009,7 @@
 		}
 	}
 
-	success = os_file_flush(file);
+	success = os_file_flush(file, TRUE);
 	if (!success) {
 
 		goto func_exit;
@@ -3031,7 +3031,7 @@
 
 		goto func_exit;
 	}
-	success = os_file_flush(file);
+	success = os_file_flush(file, TRUE);
 func_exit:
 	os_file_close(file);
 	ut_free(buf2);
@@ -4014,7 +4014,7 @@
 	size_after_extend, *actual_size); */
 	mutex_exit(&fil_system->mutex);
 
-	fil_flush(space_id);
+	fil_flush(space_id, TRUE);
 
 	return(success);
 }
@@ -4585,8 +4585,9 @@
 void
 fil_flush(
 /*======*/
-	ulint	space_id)	/*!< in: file space id (this can be a group of
+	ulint	space_id,	/*!< in: file space id (this can be a group of
 				log files or a tablespace of the database) */
+	ibool	metadata)
 {
 	fil_space_t*	space;
 	fil_node_t*	node;
@@ -4657,7 +4658,7 @@
 			/* fprintf(stderr, "Flushing to file %s\n",
 			node->name); */
 
-			os_file_flush(file);
+			os_file_flush(file, metadata);
 
 			mutex_enter(&fil_system->mutex);
 
@@ -4740,7 +4741,7 @@
 	a non-existing space id. */
 	for (i = 0; i < n_space_ids; i++) {
 
-		fil_flush(space_ids[i]);
+		fil_flush(space_ids[i], TRUE);
 	}
 
 	mem_free(space_ids);
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -445,6 +445,12 @@
   "Timeout in seconds an InnoDB transaction may wait for a lock before being rolled back. Values above 100000000 disable the timeout.",
   NULL, NULL, 50, 1, 1024 * 1024 * 1024, 0);
 
+static MYSQL_THDVAR_ULONG(flush_log_at_trx_commit, PLUGIN_VAR_OPCMDARG,
+  "Set to 0 (write and flush once per second),"
+  " 1 (write and flush at each commit)"
+  " or 2 (write at commit, flush once per second).",
+  NULL, NULL, 1, 0, 2, 0);
+
 
 static handler *innobase_create_handler(handlerton *hton,
                                         TABLE_SHARE *table,
@@ -841,6 +847,17 @@
 	}
 }
 
+/******************************************************************//**
+*/
+extern "C" UNIV_INTERN
+ulong
+thd_flush_log_at_trx_commit(
+/*================================*/
+	void*	thd)
+{
+	return(THDVAR((THD*) thd, flush_log_at_trx_commit));
+}
+
 /********************************************************************//**
 Obtain the InnoDB transaction of a MySQL thread.
 @return	reference to transaction pointer */
@@ -2471,6 +2488,9 @@
 	srv_n_read_io_threads = (ulint) innobase_read_io_threads;
 	srv_n_write_io_threads = (ulint) innobase_write_io_threads;
 
+	srv_read_ahead &= 3;
+	srv_adaptive_flushing_method %= 3;
+
 	srv_force_recovery = (ulint) innobase_force_recovery;
 
 	srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;
@@ -11141,7 +11161,7 @@
   PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
   "Purge threads can be either 0 or 1.",
   NULL, NULL,
-  0,			/* Default setting */
+  1,			/* Default setting */
   0,			/* Minimum value */
   1, 0);		/* Maximum value */
 
@@ -11183,12 +11203,18 @@
   innodb_file_format_max_validate,
   innodb_file_format_max_update, "Antelope");
 
-static MYSQL_SYSVAR_ULONG(flush_log_at_trx_commit, srv_flush_log_at_trx_commit,
-  PLUGIN_VAR_OPCMDARG,
-  "Set to 0 (write and flush once per second),"
-  " 1 (write and flush at each commit)"
-  " or 2 (write at commit, flush once per second).",
-  NULL, NULL, 1, 0, 2, 0);
+/* Changed to the THDVAR */
+//static MYSQL_SYSVAR_ULONG(flush_log_at_trx_commit, srv_flush_log_at_trx_commit,
+//  PLUGIN_VAR_OPCMDARG,
+//  "Set to 0 (write and flush once per second),"
+//  " 1 (write and flush at each commit)"
+//  " or 2 (write at commit, flush once per second).",
+//  NULL, NULL, 1, 0, 2, 0);
+
+static MYSQL_SYSVAR_BOOL(use_global_flush_log_at_trx_commit, srv_use_global_flush_log_at_trx_commit,
+  PLUGIN_VAR_NOCMDARG,
+  "Use global innodb_flush_log_at_trx_commit value. (default: ON).",
+  NULL, NULL, TRUE);
 
 static MYSQL_SYSVAR_STR(flush_method, innobase_file_flush_method,
   PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
@@ -11293,7 +11319,7 @@
 static MYSQL_SYSVAR_LONGLONG(buffer_pool_size, innobase_buffer_pool_size,
   PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
   "The size of the memory buffer InnoDB uses to cache data and indexes of its tables.",
-  NULL, NULL, 128*1024*1024L, 5*1024*1024L, LONGLONG_MAX, 1024*1024L);
+  NULL, NULL, 128*1024*1024L, 32*1024*1024L, LONGLONG_MAX, 1024*1024L);
 
 static MYSQL_SYSVAR_LONG(buffer_pool_instances, innobase_buffer_pool_instances,
   PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
@@ -11450,6 +11476,135 @@
   "trigger a readahead.",
   NULL, NULL, 56, 0, 64, 0);
 
+static MYSQL_SYSVAR_LONGLONG(ibuf_max_size, srv_ibuf_max_size,
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
+  "The maximum size of the insert buffer. (in bytes)",
+  NULL, NULL, LONGLONG_MAX, 0, LONGLONG_MAX, 0);
+
+static MYSQL_SYSVAR_ULONG(ibuf_active_contract, srv_ibuf_active_contract,
+  PLUGIN_VAR_RQCMDARG,
+  "Enable/Disable active_contract of insert buffer. 0:disable 1:enable",
+  NULL, NULL, 1, 0, 1, 0);
+
+static MYSQL_SYSVAR_ULONG(ibuf_accel_rate, srv_ibuf_accel_rate,
+  PLUGIN_VAR_RQCMDARG,
+  "Tunes amount of insert buffer processing of background, in addition to innodb_io_capacity. (in percentage)",
+  NULL, NULL, 100, 100, 999999999, 0);
+
+static MYSQL_SYSVAR_ULONG(checkpoint_age_target, srv_checkpoint_age_target,
+  PLUGIN_VAR_RQCMDARG,
+  "Control soft limit of checkpoint age. (0 : not control)",
+  NULL, NULL, 0, 0, ~0UL, 0);
+
+static
+void
+innodb_flush_neighbor_pages_update(
+  THD* thd,
+  struct st_mysql_sys_var* var,
+  void* var_ptr,
+  const void* save)
+{
+  *(long *)var_ptr = (*(long *)save) % 3;
+}
+
+const char *flush_neighbor_pages_names[]=
+{
+  "none", /* 0 */
+  "area",
+  "cont", /* 2 */
+  /* For compatibility with the older patch */
+  "0", /* "none" + 3 */
+  "1", /* "area" + 3 */
+  "2", /* "cont" + 3 */
+  NullS
+};
+
+TYPELIB flush_neighbor_pages_typelib=
+{
+  array_elements(flush_neighbor_pages_names) - 1,
+  "flush_neighbor_pages_typelib",
+  flush_neighbor_pages_names,
+  NULL
+};
+
+static MYSQL_SYSVAR_ENUM(flush_neighbor_pages, srv_flush_neighbor_pages,
+  PLUGIN_VAR_RQCMDARG, "Neighbor page flushing behaviour: none: do not flush, "
+                       "[area]: flush selected pages one-by-one, "
+                       "cont: flush a contiguous block of pages", NULL,
+  innodb_flush_neighbor_pages_update, 1, &flush_neighbor_pages_typelib);
+
+static
+void
+innodb_read_ahead_update(
+  THD* thd,
+  struct st_mysql_sys_var*     var,
+  void*        var_ptr,
+  const void*  save)
+{
+  *(long *)var_ptr= (*(long *)save) & 3;
+}
+const char *read_ahead_names[]=
+{
+  "none", /* 0 */
+  "random",
+  "linear",
+  "both", /* 3 */
+  /* For compatibility of the older patch */
+  "0", /* 4 ("none" + 4) */
+  "1",
+  "2",
+  "3", /* 7 ("both" + 4) */
+  NullS
+};
+TYPELIB read_ahead_typelib=
+{
+  array_elements(read_ahead_names) - 1, "read_ahead_typelib",
+  read_ahead_names, NULL
+};
+static MYSQL_SYSVAR_ENUM(read_ahead, srv_read_ahead,
+  PLUGIN_VAR_RQCMDARG,
+  "Control read ahead activity (none, random, [linear], both). [from 1.0.5: random read ahead is ignored]",
+  NULL, innodb_read_ahead_update, 2, &read_ahead_typelib);
+
+static
+void
+innodb_adaptive_flushing_method_update(
+  THD* thd,
+  struct st_mysql_sys_var*     var,
+  void*        var_ptr,
+  const void*  save)
+{
+  *(long *)var_ptr= (*(long *)save) % 4;
+}
+const char *adaptive_flushing_method_names[]=
+{
+  "native", /* 0 */
+  "estimate", /* 1 */
+  "keep_average", /* 2 */
+  /* For compatibility of the older patch */
+  "0", /* 3 ("none" + 3) */
+  "1", /* 4 ("estimate" + 3) */
+  "2", /* 5 ("keep_average" + 3) */
+  NullS
+};
+TYPELIB adaptive_flushing_method_typelib=
+{
+  array_elements(adaptive_flushing_method_names) - 1, "adaptive_flushing_method_typelib",
+  adaptive_flushing_method_names, NULL
+};
+static MYSQL_SYSVAR_ENUM(adaptive_flushing_method, srv_adaptive_flushing_method,
+  PLUGIN_VAR_RQCMDARG,
+  "Choose method of innodb_adaptive_flushing. (native, [estimate], keep_average)",
+  NULL, innodb_adaptive_flushing_method_update, 1, &adaptive_flushing_method_typelib);
+
+#ifdef UNIV_DEBUG
+static MYSQL_SYSVAR_ULONG(flush_checkpoint_debug, srv_flush_checkpoint_debug,
+  PLUGIN_VAR_RQCMDARG,
+  "Debug flags for InnoDB flushing and checkpointing (0=none,"
+  "1=stop preflush and checkpointing)",
+  NULL, NULL, 0, 0, 1, 0);
+#endif
+
 static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(additional_mem_pool_size),
   MYSQL_SYSVAR(autoextend_increment),
@@ -11470,6 +11625,7 @@
   MYSQL_SYSVAR(file_format_check),
   MYSQL_SYSVAR(file_format_max),
   MYSQL_SYSVAR(flush_log_at_trx_commit),
+  MYSQL_SYSVAR(use_global_flush_log_at_trx_commit),
   MYSQL_SYSVAR(flush_method),
   MYSQL_SYSVAR(force_recovery),
   MYSQL_SYSVAR(large_prefix),
@@ -11509,6 +11665,13 @@
   MYSQL_SYSVAR(show_verbose_locks),
   MYSQL_SYSVAR(show_locks_held),
   MYSQL_SYSVAR(version),
+  MYSQL_SYSVAR(ibuf_max_size),
+  MYSQL_SYSVAR(ibuf_active_contract),
+  MYSQL_SYSVAR(ibuf_accel_rate),
+  MYSQL_SYSVAR(checkpoint_age_target),
+  MYSQL_SYSVAR(flush_neighbor_pages),
+  MYSQL_SYSVAR(read_ahead),
+  MYSQL_SYSVAR(adaptive_flushing_method),
   MYSQL_SYSVAR(use_sys_malloc),
   MYSQL_SYSVAR(use_native_aio),
   MYSQL_SYSVAR(change_buffering),
@@ -11521,6 +11684,9 @@
   MYSQL_SYSVAR(purge_threads),
   MYSQL_SYSVAR(purge_batch_size),
   MYSQL_SYSVAR(rollback_segments),
+#ifdef UNIV_DEBUG
+  MYSQL_SYSVAR(flush_checkpoint_debug),
+#endif
   NULL
 };
 
--- a/storage/innobase/ibuf/ibuf0ibuf.c
+++ b/storage/innobase/ibuf/ibuf0ibuf.c
@@ -523,8 +523,10 @@
 	grow in size, as the references on the upper levels of the tree can
 	change */
 
-	ibuf->max_size = buf_pool_get_curr_size() / UNIV_PAGE_SIZE
-		/ IBUF_POOL_SIZE_PER_MAX_SIZE;
+	ibuf->max_size = ut_min( buf_pool_get_curr_size() / UNIV_PAGE_SIZE
+		/ IBUF_POOL_SIZE_PER_MAX_SIZE, (ulint) srv_ibuf_max_size / UNIV_PAGE_SIZE);
+
+	srv_ibuf_max_size = (long long) ibuf->max_size * UNIV_PAGE_SIZE;
 
 	mutex_create(ibuf_pessimistic_insert_mutex_key,
 		     &ibuf_pessimistic_insert_mutex,
@@ -2763,9 +2765,11 @@
 	size = ibuf->size;
 	max_size = ibuf->max_size;
 
+	if (!srv_ibuf_active_contract) {
 	if (size < max_size + IBUF_CONTRACT_ON_INSERT_NON_SYNC) {
 		return;
 	}
+	}
 
 	sync = (size >= max_size + IBUF_CONTRACT_ON_INSERT_SYNC);
 
--- a/storage/innobase/include/buf0rea.h
+++ b/storage/innobase/include/buf0rea.h
@@ -149,8 +149,7 @@
 
 /** The size in pages of the area which the read-ahead algorithms read if
 invoked */
-#define	BUF_READ_AHEAD_AREA(b)					\
-	ut_min(64, ut_2_power_up((b)->curr_size / 32))
+#define	BUF_READ_AHEAD_AREA(b)		64
 
 /** @name Modes used in read-ahead @{ */
 /** read only pages belonging to the insert buffer tree */
--- a/storage/innobase/include/fil0fil.h
+++ b/storage/innobase/include/fil0fil.h
@@ -663,8 +663,9 @@
 void
 fil_flush(
 /*======*/
-	ulint	space_id);	/*!< in: file space id (this can be a group of
+	ulint	space_id,	/*!< in: file space id (this can be a group of
 				log files or a tablespace of the database) */
+	ibool	metadata);
 /**********************************************************************//**
 Flushes to disk writes in file spaces of the given type possibly cached by
 the OS. */
--- a/storage/innobase/include/ha_prototypes.h
+++ b/storage/innobase/include/ha_prototypes.h
@@ -284,6 +284,13 @@
 /*===================*/
         void*   thd,	/*!< in: thread handle (THD*) */
         ulint   value);	/*!< in: time waited for the lock */
+/******************************************************************//**
+*/
+
+ulong
+thd_flush_log_at_trx_commit(
+/*================================*/
+	void*	thd);
 
 /**********************************************************************//**
 Get the current setting of the lower_case_table_names global parameter from
--- a/storage/innobase/include/os0file.h
+++ b/storage/innobase/include/os0file.h
@@ -296,8 +296,8 @@
 	pfs_os_file_write_func(name, file, buf, offset, offset_high,	\
 			       n, __FILE__, __LINE__)
 
-# define os_file_flush(file)						\
-	pfs_os_file_flush_func(file, __FILE__, __LINE__)
+# define os_file_flush(file, metadata)					\
+	pfs_os_file_flush_func(file, metadata, __FILE__, __LINE__)
 
 # define os_file_rename(key, oldpath, newpath)				\
 	pfs_os_file_rename_func(key, oldpath, newpath, __FILE__, __LINE__)
@@ -333,7 +333,7 @@
 # define os_file_write(name, file, buf, offset, offset_high, n)		\
 	os_file_write_func(name, file, buf, offset, offset_high, n)
 
-# define os_file_flush(file)	os_file_flush_func(file)
+# define os_file_flush(file, metadata)	os_file_flush_func(file, metadata)
 
 # define os_file_rename(key, oldpath, newpath)				\
 	os_file_rename_func(oldpath, newpath)
@@ -781,6 +781,7 @@
 pfs_os_file_flush_func(
 /*===================*/
 	os_file_t	file,	/*!< in, own: handle to a file */
+	ibool		metadata,
 	const char*	src_file,/*!< in: file name where func invoked */
 	ulint		src_line);/*!< in: line where the func invoked */
 
@@ -860,7 +861,8 @@
 ibool
 os_file_flush_func(
 /*===============*/
-	os_file_t	file);	/*!< in, own: handle to a file */
+	os_file_t	file,	/*!< in, own: handle to a file */
+	ibool		metadata);
 /***********************************************************************//**
 Retrieves the last error number if an error occurs in a file io function.
 The number should be retrieved before any other OS calls (because they may
--- a/storage/innobase/include/os0file.ic
+++ b/storage/innobase/include/os0file.ic
@@ -369,6 +369,7 @@
 pfs_os_file_flush_func(
 /*===================*/
 	os_file_t	file,	/*!< in, own: handle to a file */
+	ibool		metadata,
 	const char*	src_file,/*!< in: file name where func invoked */
 	ulint		src_line)/*!< in: line where the func invoked */
 {
@@ -378,7 +379,7 @@
 
 	register_pfs_file_io_begin(&state, locker, file, 0, PSI_FILE_SYNC,
 				   src_file, src_line);
-	result = os_file_flush_func(file);
+	result = os_file_flush_func(file, metadata);
 
 	register_pfs_file_io_end(locker, 0);
 
--- a/storage/innobase/include/srv0srv.h
+++ b/storage/innobase/include/srv0srv.h
@@ -138,7 +138,8 @@
 extern ulint	srv_n_log_files;
 extern ulint	srv_log_file_size;
 extern ulint	srv_log_buffer_size;
-extern ulong	srv_flush_log_at_trx_commit;
+//extern ulong	srv_flush_log_at_trx_commit;
+extern char	srv_use_global_flush_log_at_trx_commit;
 extern char	srv_adaptive_flushing;
 
 /* If this flag is TRUE, then we will load the indexes' (and tables') metadata
@@ -221,6 +222,16 @@
 extern ulong	srv_max_purge_lag;
 
 extern ulong	srv_replication_delay;
+
+extern long long	srv_ibuf_max_size;
+extern ulint	srv_ibuf_active_contract;
+extern ulint	srv_ibuf_accel_rate;
+extern ulint	srv_checkpoint_age_target;
+extern ulint	srv_flush_neighbor_pages;
+extern ulint	srv_enable_unsafe_group_commit;
+extern ulint	srv_read_ahead;
+extern ulint	srv_adaptive_flushing_method;
+
 /*-------------------------------------------*/
 
 extern ulint	srv_n_rows_inserted;
@@ -255,6 +266,9 @@
 extern	ibool	srv_print_buf_io;
 extern	ibool	srv_print_log_io;
 extern	ibool	srv_print_latch_waits;
+
+extern	ulint	srv_flush_checkpoint_debug;
+
 #else /* UNIV_DEBUG */
 # define srv_print_thread_releases	FALSE
 # define srv_print_lock_waits		FALSE
@@ -399,8 +413,9 @@
 				when writing data files, but do flush
 				after writing to log files */
 	SRV_UNIX_NOSYNC,	/*!< do not flush after writing */
-	SRV_UNIX_O_DIRECT	/*!< invoke os_file_set_nocache() on
+	SRV_UNIX_O_DIRECT,	/*!< invoke os_file_set_nocache() on
 				data files */
+	SRV_UNIX_ALL_O_DIRECT	/* new method for examination: logfile also open O_DIRECT */
 };
 
 /** Alternatives for file i/o in Windows */
--- a/storage/innobase/log/log0log.c
+++ b/storage/innobase/log/log0log.c
@@ -48,6 +48,7 @@
 #include "srv0start.h"
 #include "trx0sys.h"
 #include "trx0trx.h"
+#include "ha_prototypes.h"
 
 /*
 General philosophy of InnoDB redo-logs:
@@ -359,6 +360,33 @@
 }
 
 /************************************************************//**
+*/
+UNIV_INLINE
+ulint
+log_max_modified_age_async()
+{
+	if (srv_checkpoint_age_target) {
+		return(ut_min(log_sys->max_modified_age_async,
+				srv_checkpoint_age_target
+				- srv_checkpoint_age_target / 8));
+	} else {
+		return(log_sys->max_modified_age_async);
+	}
+}
+
+UNIV_INLINE
+ulint
+log_max_checkpoint_age_async()
+{
+	if (srv_checkpoint_age_target) {
+		return(ut_min(log_sys->max_checkpoint_age_async,
+				srv_checkpoint_age_target));
+	} else {
+		return(log_sys->max_checkpoint_age_async);
+	}
+}
+
+/************************************************************//**
 Closes the log.
 @return	lsn */
 UNIV_INTERN
@@ -427,7 +455,7 @@
 		}
 	}
 
-	if (checkpoint_age <= log->max_modified_age_async) {
+	if (checkpoint_age <= log_max_modified_age_async()) {
 
 		goto function_exit;
 	}
@@ -435,8 +463,8 @@
 	oldest_lsn = buf_pool_get_oldest_modification();
 
 	if (!oldest_lsn
-	    || lsn - oldest_lsn > log->max_modified_age_async
-	    || checkpoint_age > log->max_checkpoint_age_async) {
+	    || lsn - oldest_lsn > log_max_modified_age_async()
+	    || checkpoint_age > log_max_checkpoint_age_async()) {
 
 		log->check_flush_or_checkpoint = TRUE;
 	}
@@ -1100,9 +1128,10 @@
 		group = (log_group_t*)((ulint)group - 1);
 
 		if (srv_unix_file_flush_method != SRV_UNIX_O_DSYNC
+		    && srv_unix_file_flush_method != SRV_UNIX_ALL_O_DIRECT
 		    && srv_unix_file_flush_method != SRV_UNIX_NOSYNC) {
 
-			fil_flush(group->space_id);
+			fil_flush(group->space_id, FALSE);
 		}
 
 #ifdef UNIV_DEBUG
@@ -1121,10 +1150,11 @@
 			logs and cannot end up here! */
 
 	if (srv_unix_file_flush_method != SRV_UNIX_O_DSYNC
+	    && srv_unix_file_flush_method != SRV_UNIX_ALL_O_DIRECT
 	    && srv_unix_file_flush_method != SRV_UNIX_NOSYNC
-	    && srv_flush_log_at_trx_commit != 2) {
+	    && thd_flush_log_at_trx_commit(NULL) != 2) {
 
-		fil_flush(group->space_id);
+		fil_flush(group->space_id, FALSE);
 	}
 
 	mutex_enter(&(log_sys->mutex));
@@ -1501,7 +1531,8 @@
 
 	mutex_exit(&(log_sys->mutex));
 
-	if (srv_unix_file_flush_method == SRV_UNIX_O_DSYNC) {
+	if (srv_unix_file_flush_method == SRV_UNIX_O_DSYNC
+	    || srv_unix_file_flush_method == SRV_UNIX_ALL_O_DIRECT) {
 		/* O_DSYNC means the OS did not buffer the log file at all:
 		so we have also flushed to disk what we have written */
 
@@ -1511,7 +1542,7 @@
 
 		group = UT_LIST_GET_FIRST(log_sys->log_groups);
 
-		fil_flush(group->space_id);
+		fil_flush(group->space_id, FALSE);
 		log_sys->flushed_to_disk_lsn = log_sys->write_lsn;
 	}
 
@@ -1655,10 +1686,13 @@
 		recv_apply_hashed_log_recs(TRUE);
 	}
 
+ retry:
 	n_pages = buf_flush_list(ULINT_MAX, new_oldest);
 
-	if (sync) {
-		buf_flush_wait_batch_end(NULL, BUF_FLUSH_LIST);
+	if (sync && n_pages != 0) {
+		//buf_flush_wait_batch_end(NULL, BUF_FLUSH_LIST);
+		os_thread_sleep(100000);
+		goto retry;
 	}
 
 	if (n_pages == ULINT_UNDEFINED) {
@@ -1979,6 +2013,13 @@
 {
 	ib_uint64_t	oldest_lsn;
 
+#ifdef UNIV_DEBUG
+	if (srv_flush_checkpoint_debug == 1) {
+
+		return TRUE;
+	}
+#endif
+
 	if (recv_recovery_is_on()) {
 		recv_apply_hashed_log_recs(TRUE);
 	}
@@ -2070,7 +2111,11 @@
 					physical write will always be made to
 					log files */
 {
-	/* Preflush pages synchronously */
+#ifdef UNIV_DEBUG
+	if (srv_flush_checkpoint_debug == 1)
+		return;
+#endif
+/* Preflush pages synchronously */
 
 	while (!log_preflush_pool_modified_pages(lsn, TRUE));
 
@@ -2096,7 +2141,13 @@
 	ibool		checkpoint_sync;
 	ibool		do_checkpoint;
 	ibool		success;
-loop:
+
+#ifdef UNIV_DEBUG
+	if (srv_flush_checkpoint_debug == 1)
+		return;
+#endif
+
+ loop:
 	sync = FALSE;
 	checkpoint_sync = FALSE;
 	do_checkpoint = FALSE;
@@ -2119,13 +2170,15 @@
 		/* A flush is urgent: we have to do a synchronous preflush */
 
 		sync = TRUE;
-		advance = 2 * (age - log->max_modified_age_sync);
-	} else if (age > log->max_modified_age_async) {
+		advance = age - log->max_modified_age_sync;
+	} else if (age > log_max_modified_age_async()) {
 
 		/* A flush is not urgent: we do an asynchronous preflush */
-		advance = age - log->max_modified_age_async;
+		advance = age - log_max_modified_age_async();
+		log->check_flush_or_checkpoint = FALSE;
 	} else {
 		advance = 0;
+		log->check_flush_or_checkpoint = FALSE;
 	}
 
 	checkpoint_age = log->lsn - log->last_checkpoint_lsn;
@@ -2137,14 +2190,14 @@
 
 		do_checkpoint = TRUE;
 
-	} else if (checkpoint_age > log->max_checkpoint_age_async) {
+	} else if (checkpoint_age > log_max_checkpoint_age_async()) {
 		/* A checkpoint is not urgent: do it asynchronously */
 
 		do_checkpoint = TRUE;
 
-		log->check_flush_or_checkpoint = FALSE;
+		//log->check_flush_or_checkpoint = FALSE;
 	} else {
-		log->check_flush_or_checkpoint = FALSE;
+		//log->check_flush_or_checkpoint = FALSE;
 	}
 
 	mutex_exit(&(log->mutex));
@@ -2152,6 +2205,7 @@
 	if (advance) {
 		ib_uint64_t	new_oldest = oldest_lsn + advance;
 
+retry:
 		success = log_preflush_pool_modified_pages(new_oldest, sync);
 
 		/* If the flush succeeded, this thread has done its part
@@ -2166,7 +2220,7 @@
 			log->check_flush_or_checkpoint = TRUE;
 
 			mutex_exit(&(log->mutex));
-			goto loop;
+			goto retry;
 		}
 	}
 
@@ -2607,7 +2661,7 @@
 
 	mutex_exit(&(log_sys->mutex));
 
-	fil_flush(group->archive_space_id);
+	fil_flush(group->archive_space_id, TRUE);
 
 	mutex_enter(&(log_sys->mutex));
 
@@ -3044,7 +3098,11 @@
 log_check_margins(void)
 /*===================*/
 {
-loop:
+#ifdef UNIV_DEBUG
+	if (srv_flush_checkpoint_debug == 1)
+		return;
+#endif
+ loop:
 	log_flush_margin();
 
 	log_checkpoint_margin();
@@ -3349,6 +3407,17 @@
 		log_sys->flushed_to_disk_lsn,
 		log_sys->last_checkpoint_lsn);
 
+	fprintf(file,
+		"Max checkpoint age    %lu\n"
+		"Checkpoint age target %lu\n"
+		"Modified age          %lu\n"
+		"Checkpoint age        %lu\n",
+		(ulong) log_sys->max_checkpoint_age,
+		(ulong) log_max_checkpoint_age_async(),
+		(ulong) (log_sys->lsn -
+				log_buf_pool_get_oldest_modification()),
+		(ulong) (log_sys->lsn - log_sys->last_checkpoint_lsn));
+
 	current_time = time(NULL);
 
 	time_elapsed = 0.001 + difftime(current_time,
--- a/storage/innobase/log/log0recv.c
+++ b/storage/innobase/log/log0recv.c
@@ -2906,9 +2906,12 @@
 	ib_uint64_t	archived_lsn;
 #endif /* UNIV_LOG_ARCHIVE */
 	byte*		buf;
-	byte		log_hdr_buf[LOG_FILE_HDR_SIZE];
+	byte*		log_hdr_buf;
+	byte		log_hdr_buf_base[LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE];
 	ulint		err;
 
+	log_hdr_buf = ut_align(log_hdr_buf_base, OS_FILE_LOG_BLOCK_SIZE);
+
 #ifdef UNIV_LOG_ARCHIVE
 	ut_ad(type != LOG_CHECKPOINT || limit_lsn == IB_ULONGLONG_MAX);
 /** TRUE when recovering from a checkpoint */
@@ -3468,7 +3471,7 @@
 			exit(1);
 		}
 
-		os_file_flush(log_file);
+		os_file_flush(log_file, TRUE);
 		os_file_close(log_file);
 	}
 
@@ -3492,7 +3495,7 @@
 
 	os_file_write(name, log_file, buf, 0, 0,
 		      LOG_FILE_HDR_SIZE + OS_FILE_LOG_BLOCK_SIZE);
-	os_file_flush(log_file);
+	os_file_flush(log_file, TRUE);
 	os_file_close(log_file);
 
 	ut_free(buf);
--- a/storage/innobase/os/os0file.c
+++ b/storage/innobase/os/os0file.c
@@ -1424,7 +1424,7 @@
 #endif
 #ifdef UNIV_NON_BUFFERED_IO
 # ifndef UNIV_HOTBACKUP
-		if (type == OS_LOG_FILE && srv_flush_log_at_trx_commit == 2) {
+		if (type == OS_LOG_FILE && thd_flush_log_at_trx_commit(NULL) == 2) {
 			/* Do not use unbuffered i/o to log files because
 			value 2 denotes that we do not flush the log at every
 			commit, but only once per second */
@@ -1440,7 +1440,7 @@
 		attributes = 0;
 #ifdef UNIV_NON_BUFFERED_IO
 # ifndef UNIV_HOTBACKUP
-		if (type == OS_LOG_FILE && srv_flush_log_at_trx_commit == 2) {
+		if (type == OS_LOG_FILE && thd_flush_log_at_trx_commit(NULL) == 2) {
 			/* Do not use unbuffered i/o to log files because
 			value 2 denotes that we do not flush the log at every
 			commit, but only once per second */
@@ -1585,6 +1585,11 @@
 		os_file_set_nocache(file, name, mode_str);
 	}
 
+	/* ALL_O_DIRECT: O_DIRECT also for transaction log file */
+	if (srv_unix_file_flush_method == SRV_UNIX_ALL_O_DIRECT) {
+		os_file_set_nocache(file, name, mode_str);
+	}
+
 #ifdef USE_FILE_LOCK
 	if (create_mode != OS_FILE_OPEN_RAW && os_file_lock(file, name)) {
 
@@ -2008,7 +2013,7 @@
 
 	ut_free(buf2);
 
-	ret = os_file_flush(file);
+	ret = os_file_flush(file, TRUE);
 
 	if (ret) {
 		return(TRUE);
@@ -2046,7 +2051,8 @@
 int
 os_file_fsync(
 /*==========*/
-	os_file_t	file)	/*!< in: handle to a file */
+	os_file_t	file,	/*!< in: handle to a file */
+	ibool		metadata)
 {
 	int	ret;
 	int	failures;
@@ -2055,7 +2061,16 @@
 	failures = 0;
 
 	do {
+#if defined(HAVE_FDATASYNC) && HAVE_DECL_FDATASYNC
+		if (metadata) {
+			ret = fsync(file);
+		} else {
+			ret = fdatasync(file);
+		}
+#else
+		(void) metadata;
 		ret = fsync(file);
+#endif
 
 		os_n_fsyncs++;
 
@@ -2092,7 +2107,8 @@
 ibool
 os_file_flush_func(
 /*===============*/
-	os_file_t	file)	/*!< in, own: handle to a file */
+	os_file_t	file,	/*!< in, own: handle to a file */
+	ibool		metadata)
 {
 #ifdef __WIN__
 	BOOL	ret;
@@ -2142,18 +2158,18 @@
 		/* If we are not on an operating system that supports this,
 		then fall back to a plain fsync. */
 
-		ret = os_file_fsync(file);
+		ret = os_file_fsync(file, metadata);
 	} else {
 		ret = fcntl(file, F_FULLFSYNC, NULL);
 
 		if (ret) {
 			/* If we are not on a file system that supports this,
 			then fall back to a plain fsync. */
-			ret = os_file_fsync(file);
+			ret = os_file_fsync(file, metadata);
 		}
 	}
 #else
-	ret = os_file_fsync(file);
+	ret = os_file_fsync(file, metadata);
 #endif
 
 	if (ret == 0) {
@@ -2336,7 +2352,7 @@
 		the OS crashes, a database page is only partially
 		physically written to disk. */
 
-		ut_a(TRUE == os_file_flush(file));
+		ut_a(TRUE == os_file_flush(file, TRUE));
 	}
 # endif /* UNIV_DO_FLUSH */
 
@@ -2378,7 +2394,7 @@
 			the OS crashes, a database page is only partially
 			physically written to disk. */
 
-			ut_a(TRUE == os_file_flush(file));
+			ut_a(TRUE == os_file_flush(file, TRUE));
 		}
 # endif /* UNIV_DO_FLUSH */
 
@@ -2750,7 +2766,7 @@
 
 # ifdef UNIV_DO_FLUSH
 	if (!os_do_not_call_flush_at_each_write) {
-		ut_a(TRUE == os_file_flush(file));
+		ut_a(TRUE == os_file_flush(file, TRUE));
 	}
 # endif /* UNIV_DO_FLUSH */
 
@@ -4296,7 +4312,7 @@
 #ifdef UNIV_DO_FLUSH
 		if (slot->type == OS_FILE_WRITE
 		    && !os_do_not_call_flush_at_each_write) {
-			if (!os_file_flush(slot->file)) {
+			if (!os_file_flush(slot->file, TRUE)) {
 				ut_error;
 			}
 		}
@@ -4597,7 +4613,7 @@
 #ifdef UNIV_DO_FLUSH
 		if (slot->type == OS_FILE_WRITE
 		    && !os_do_not_call_flush_at_each_write)
-		    && !os_file_flush(slot->file) {
+		    && !os_file_flush(slot->file, TRUE) {
 			ut_error;
 		}
 #endif /* UNIV_DO_FLUSH */
--- a/storage/innobase/srv/srv0srv.c
+++ b/storage/innobase/srv/srv0srv.c
@@ -183,7 +183,8 @@
 UNIV_INTERN ulint	srv_log_file_size	= ULINT_MAX;
 /* size in database pages */
 UNIV_INTERN ulint	srv_log_buffer_size	= ULINT_MAX;
-UNIV_INTERN ulong	srv_flush_log_at_trx_commit = 1;
+//UNIV_INTERN ulong	srv_flush_log_at_trx_commit = 1;
+UNIV_INTERN char	srv_use_global_flush_log_at_trx_commit	= TRUE;
 
 /* Try to flush dirty pages so as to avoid IO bursts at
 the checkpoints. */
@@ -404,6 +405,17 @@
 
 UNIV_INTERN ulong	srv_replication_delay		= 0;
 
+UNIV_INTERN long long	srv_ibuf_max_size = 0;
+UNIV_INTERN ulint	srv_ibuf_active_contract = 0; /* 0:disable 1:enable */
+UNIV_INTERN ulint	srv_ibuf_accel_rate = 100;
+#define PCT_IBUF_IO(pct) ((ulint) (srv_io_capacity * srv_ibuf_accel_rate * ((double) pct / 10000.0)))
+
+UNIV_INTERN ulint	srv_checkpoint_age_target = 0;
+UNIV_INTERN ulint	srv_flush_neighbor_pages = 1; /* 0:disable 1:area 2:contiguous */
+
+UNIV_INTERN ulint	srv_enable_unsafe_group_commit = 0; /* 0:disable 1:enable */
+UNIV_INTERN ulint	srv_read_ahead = 3; /* 1: random  2: linear  3: Both */
+UNIV_INTERN ulint	srv_adaptive_flushing_method = 0; /* 0: native  1: estimate  2: keep_average */
 /*-------------------------------------------*/
 UNIV_INTERN ulong	srv_n_spin_wait_rounds	= 30;
 UNIV_INTERN ulong	srv_n_free_tickets_to_enter = 500;
@@ -417,6 +429,9 @@
 UNIV_INTERN ibool	srv_print_buf_io		= FALSE;
 UNIV_INTERN ibool	srv_print_log_io		= FALSE;
 UNIV_INTERN ibool	srv_print_latch_waits		= FALSE;
+
+UNIV_INTERN ulong	srv_flush_checkpoint_debug = 0;
+
 #endif /* UNIV_DEBUG */
 
 UNIV_INTERN ulint		srv_n_rows_inserted		= 0;
@@ -2713,7 +2728,7 @@
 
 	ut_ad(!mutex_own(&kernel_mutex));
 
-	ut_a(srv_n_purge_threads == 0);
+	ut_a(srv_n_purge_threads == 0 || (srv_shutdown_state > 0 && srv_n_threads_active[SRV_WORKER] == 0));
 
 	do {
 		/* Check for shutdown and change in purge config. */
@@ -2746,6 +2761,7 @@
 	ulint		n_pages_purged	= 0;
 	ulint		n_bytes_merged;
 	ulint		n_pages_flushed;
+	ulint		n_pages_flushed_prev = 0;
 	ulint		n_bytes_archived;
 	ulint		n_tables_to_drop;
 	ulint		n_ios;
@@ -2753,7 +2769,20 @@
 	ulint		n_ios_very_old;
 	ulint		n_pend_ios;
 	ulint		next_itr_time;
+	ulint		prev_adaptive_flushing_method = ULINT_UNDEFINED;
+	ulint		inner_loop = 0;
+	ibool		skip_sleep	= FALSE;
 	ulint		i;
+	struct t_prev_flush_info_struct {
+		ulint		count;
+		unsigned	space:32;
+		unsigned	offset:32;
+		ib_uint64_t	oldest_modification;
+	} prev_flush_info[MAX_BUFFER_POOLS];
+
+	ib_uint64_t	lsn_old;
+
+	ib_uint64_t	oldest_lsn;
 
 #ifdef UNIV_DEBUG_THREAD_CREATION
 	fprintf(stderr, "Master thread starts, id %lu\n",
@@ -2775,6 +2804,9 @@
 
 	mutex_exit(&kernel_mutex);
 
+	mutex_enter(&(log_sys->mutex));
+	lsn_old = log_sys->lsn;
+	mutex_exit(&(log_sys->mutex));
 loop:
 	/*****************************************************************/
 	/* ---- When there is database activity by users, we cycle in this
@@ -2805,9 +2837,13 @@
 	/* Sleep for 1 second on entrying the for loop below the first time. */
 	next_itr_time = ut_time_ms() + 1000;
 
+	skip_sleep = FALSE;
+
 	for (i = 0; i < 10; i++) {
 		ulint	cur_time = ut_time_ms();
 
+		n_pages_flushed = 0; /* initialize */
+
 		/* ALTER TABLE in MySQL requires on Unix that the table handler
 		can drop tables lazily after there no longer are SELECT
 		queries to them. */
@@ -2831,6 +2867,7 @@
 		srv_main_thread_op_info = "sleeping";
 		srv_main_1_second_loops++;
 
+		if (!skip_sleep) {
 		if (next_itr_time > cur_time
 		    && srv_shutdown_state == SRV_SHUTDOWN_NONE) {
 
@@ -2841,10 +2878,26 @@
 					(next_itr_time - cur_time)
 					 * 1000));
 			srv_main_sleeps++;
+
+			/*
+			mutex_enter(&(log_sys->mutex));
+			oldest_lsn = buf_pool_get_oldest_modification();
+			ib_uint64_t	lsn = log_sys->lsn;
+			mutex_exit(&(log_sys->mutex));
+
+			if(oldest_lsn)
+			fprintf(stderr,
+				"InnoDB flush: age pct: %lu, lsn progress: %lu\n",
+				(lsn - oldest_lsn) * 100 / log_sys->max_checkpoint_age,
+				lsn - lsn_old);
+			*/
 		}
 
 		/* Each iteration should happen at 1 second interval. */
 		next_itr_time = ut_time_ms() + 1000;
+		} /* if (!skip_sleep) */
+
+		skip_sleep = FALSE;
 
 		/* Flush logs if needed */
 		srv_sync_log_buffer_in_background();
@@ -2864,7 +2917,7 @@
 		if (n_pend_ios < SRV_PEND_IO_THRESHOLD
 		    && (n_ios - n_ios_old < SRV_RECENT_IO_ACTIVITY)) {
 			srv_main_thread_op_info = "doing insert buffer merge";
-			ibuf_contract_for_n_pages(FALSE, PCT_IO(5));
+			ibuf_contract_for_n_pages(FALSE, PCT_IBUF_IO(5));
 
 			/* Flush logs if needed */
 			srv_sync_log_buffer_in_background();
@@ -2881,7 +2934,11 @@
 			n_pages_flushed = buf_flush_list(
 				PCT_IO(100), IB_ULONGLONG_MAX);
 
-		} else if (srv_adaptive_flushing) {
+			mutex_enter(&(log_sys->mutex));
+			lsn_old = log_sys->lsn;
+			mutex_exit(&(log_sys->mutex));
+			prev_adaptive_flushing_method = ULINT_UNDEFINED;
+		} else if (srv_adaptive_flushing && srv_adaptive_flushing_method == 0) {
 
 			/* Try to keep the rate of flushing of dirty
 			pages such that redo log generation does not
@@ -2897,6 +2954,224 @@
 						n_flush,
 						IB_ULONGLONG_MAX);
 			}
+
+			mutex_enter(&(log_sys->mutex));
+			lsn_old = log_sys->lsn;
+			mutex_exit(&(log_sys->mutex));
+			prev_adaptive_flushing_method = ULINT_UNDEFINED;
+		} else if (srv_adaptive_flushing && srv_adaptive_flushing_method == 1) {
+
+			/* Try to keep modified age not to exceed
+			max_checkpoint_age * 7/8 line */
+
+			mutex_enter(&(log_sys->mutex));
+
+			oldest_lsn = buf_pool_get_oldest_modification();
+			if (oldest_lsn == 0) {
+				lsn_old = log_sys->lsn;
+				mutex_exit(&(log_sys->mutex));
+
+			} else {
+				if ((log_sys->lsn - oldest_lsn)
+				    > (log_sys->max_checkpoint_age) - ((log_sys->max_checkpoint_age) / 8)) {
+					/* LOG_POOL_PREFLUSH_RATIO_ASYNC is exceeded. */
+					/* We should not flush from here. */
+					lsn_old = log_sys->lsn;
+					mutex_exit(&(log_sys->mutex));
+				} else if ((log_sys->lsn - oldest_lsn)
+					   > (log_sys->max_checkpoint_age)/4 ) {
+
+					/* defence line (max_checkpoint_age * 1/2) */
+					ib_uint64_t	lsn = log_sys->lsn;
+
+					ib_uint64_t	level, bpl;
+					buf_page_t*	bpage;
+					ulint		j;
+
+					mutex_exit(&(log_sys->mutex));
+
+					bpl = 0;
+
+					for (j = 0; j < srv_buf_pool_instances; j++) {
+						buf_pool_t*	buf_pool;
+						ulint		n_blocks;
+
+						buf_pool = buf_pool_from_array(j);
+
+						/* The scanning flush_list is optimistic here */
+
+						level = 0;
+						n_blocks = 0;
+						bpage = UT_LIST_GET_FIRST(buf_pool->flush_list);
+
+						while (bpage != NULL) {
+							ib_uint64_t	oldest_modification = bpage->oldest_modification;
+							if (oldest_modification != 0) {
+								level += log_sys->max_checkpoint_age
+									 - (lsn - oldest_modification);
+							}
+							bpage = UT_LIST_GET_NEXT(list, bpage);
+							n_blocks++;
+						}
+
+						if (level) {
+							bpl += ((ib_uint64_t) n_blocks * n_blocks
+								* (lsn - lsn_old)) / level;
+						}
+
+					}
+
+					if (!srv_use_doublewrite_buf) {
+						/* flush is faster than when doublewrite */
+						bpl = (bpl * 7) / 8;
+					}
+
+					if (bpl) {
+retry_flush_batch:
+						n_pages_flushed = buf_flush_list(bpl,
+									oldest_lsn + (lsn - lsn_old));
+						if (n_pages_flushed == ULINT_UNDEFINED) {
+							os_thread_sleep(5000);
+							goto retry_flush_batch;
+						}
+					}
+
+					lsn_old = lsn;
+					/*
+					fprintf(stderr,
+						"InnoDB flush: age pct: %lu, lsn progress: %lu, blocks to flush:%llu\n",
+						(lsn - oldest_lsn) * 100 / log_sys->max_checkpoint_age,
+						lsn - lsn_old, bpl);
+					*/
+				} else {
+					lsn_old = log_sys->lsn;
+					mutex_exit(&(log_sys->mutex));
+				}
+			}
+			prev_adaptive_flushing_method = 1;
+		} else if (srv_adaptive_flushing && srv_adaptive_flushing_method == 2) {
+			buf_pool_t*	buf_pool;
+			buf_page_t*	bpage;
+			ib_uint64_t	lsn;
+			ulint		j;
+
+			mutex_enter(&(log_sys->mutex));
+			oldest_lsn = buf_pool_get_oldest_modification();
+			lsn = log_sys->lsn;
+			mutex_exit(&(log_sys->mutex));
+
+			/* upper loop/sec. (x10) */
+			next_itr_time -= 900; /* 1000 - 900 == 100 */
+			inner_loop++;
+			if (inner_loop < 10) {
+				i--;
+			} else {
+				inner_loop = 0;
+			}
+
+			if (prev_adaptive_flushing_method == 2) {
+				lint	n_flush;
+				lint	blocks_sum;
+				ulint	new_blocks_sum, flushed_blocks_sum;
+
+				blocks_sum = new_blocks_sum = flushed_blocks_sum = 0;
+
+				/* prev_flush_info[j] should be the previous loop's */
+				for (j = 0; j < srv_buf_pool_instances; j++) {
+					lint	blocks_num, new_blocks_num, flushed_blocks_num;
+					ibool	found;
+
+					buf_pool = buf_pool_from_array(j);
+
+					blocks_num = UT_LIST_GET_LEN(buf_pool->flush_list);
+					bpage = UT_LIST_GET_FIRST(buf_pool->flush_list);
+					new_blocks_num = 0;
+
+					found = FALSE;
+					while (bpage != NULL) {
+						if (prev_flush_info[j].space == bpage->space
+						    && prev_flush_info[j].offset == bpage->offset
+						    && prev_flush_info[j].oldest_modification
+								== bpage->oldest_modification) {
+							found = TRUE;
+							break;
+						}
+						bpage = UT_LIST_GET_NEXT(list, bpage);
+						new_blocks_num++;
+					}
+					if (!found) {
+						new_blocks_num = blocks_num;
+					}
+
+					flushed_blocks_num = new_blocks_num + prev_flush_info[j].count
+								- blocks_num;
+					if (flushed_blocks_num < 0) {
+						flushed_blocks_num = 0;
+					}
+
+					bpage = UT_LIST_GET_FIRST(buf_pool->flush_list);
+
+					prev_flush_info[j].count = UT_LIST_GET_LEN(buf_pool->flush_list);
+					if (bpage) {
+						prev_flush_info[j].space = bpage->space;
+						prev_flush_info[j].offset = bpage->offset;
+						prev_flush_info[j].oldest_modification = bpage->oldest_modification;
+					} else {
+						prev_flush_info[j].space = 0;
+						prev_flush_info[j].offset = 0;
+						prev_flush_info[j].oldest_modification = 0;
+					}
+
+					new_blocks_sum += new_blocks_num;
+					flushed_blocks_sum += flushed_blocks_num;
+					blocks_sum += blocks_num;
+				}
+
+				n_flush = blocks_sum * (lsn - lsn_old) / log_sys->max_modified_age_async;
+				if (flushed_blocks_sum > n_pages_flushed_prev) {
+					n_flush -= (flushed_blocks_sum - n_pages_flushed_prev);
+				}
+
+				if (n_flush > 0) {
+					n_flush++;
+					n_pages_flushed = buf_flush_list(n_flush, oldest_lsn + (lsn - lsn_old));
+				} else {
+					n_pages_flushed = 0;
+				}					
+			} else {
+				/* store previous first pages of the flush_list */
+				for (j = 0; j < srv_buf_pool_instances; j++) {
+					buf_pool = buf_pool_from_array(j);
+
+					bpage = UT_LIST_GET_FIRST(buf_pool->flush_list);
+
+					prev_flush_info[j].count = UT_LIST_GET_LEN(buf_pool->flush_list);
+					if (bpage) {
+						prev_flush_info[j].space = bpage->space;
+						prev_flush_info[j].offset = bpage->offset;
+						prev_flush_info[j].oldest_modification = bpage->oldest_modification;
+					} else {
+						prev_flush_info[j].space = 0;
+						prev_flush_info[j].offset = 0;
+						prev_flush_info[j].oldest_modification = 0;
+					}
+				}
+				n_pages_flushed = 0;
+			}
+
+			lsn_old = lsn;
+			prev_adaptive_flushing_method = 2;
+		} else {
+			mutex_enter(&(log_sys->mutex));
+			lsn_old = log_sys->lsn;
+			mutex_exit(&(log_sys->mutex));
+			prev_adaptive_flushing_method = ULINT_UNDEFINED;
+		}
+
+		if (n_pages_flushed == ULINT_UNDEFINED) {
+			n_pages_flushed_prev = 0;
+		} else {
+			n_pages_flushed_prev = n_pages_flushed;
 		}
 
 		if (srv_activity_count == old_activity_count) {
@@ -2945,12 +3220,12 @@
 	even if the server were active */
 
 	srv_main_thread_op_info = "doing insert buffer merge";
-	ibuf_contract_for_n_pages(FALSE, PCT_IO(5));
+	ibuf_contract_for_n_pages(FALSE, PCT_IBUF_IO(5));
 
 	/* Flush logs if needed */
 	srv_sync_log_buffer_in_background();
 
-	if (srv_n_purge_threads == 0) {
+	if (srv_n_purge_threads == 0 || (srv_shutdown_state > 0 && srv_n_threads_active[SRV_WORKER] == 0)) {
 		srv_main_thread_op_info = "master purging";
 
 		srv_master_do_purge();
@@ -2982,11 +3257,18 @@
 			  PCT_IO(10), IB_ULONGLONG_MAX);
 	}
 
-	srv_main_thread_op_info = "making checkpoint";
+#ifdef UNIV_DEBUG
+	if (srv_flush_checkpoint_debug != 1) {
+#endif
 
-	/* Make a new checkpoint about once in 10 seconds */
+		srv_main_thread_op_info = "making checkpoint";
 
-	log_checkpoint(TRUE, FALSE);
+		/* Make a new checkpoint about once in 10 seconds */
+
+		log_checkpoint(TRUE, FALSE);
+#ifdef UNIV_DEBUG
+	}
+#endif
 
 	srv_main_thread_op_info = "reserving kernel mutex";
 
@@ -3028,7 +3310,7 @@
 		}
 	}
 
-	if (srv_n_purge_threads == 0) {
+	if (srv_n_purge_threads == 0 || (srv_shutdown_state > 0 && srv_n_threads_active[SRV_WORKER] == 0)) {
 		srv_main_thread_op_info = "master purging";
 
 		srv_master_do_purge();
@@ -3053,7 +3335,7 @@
 		buf_flush_list below. Otherwise, the system favors
 		clean pages over cleanup throughput. */
 		n_bytes_merged = ibuf_contract_for_n_pages(FALSE,
-							   PCT_IO(100));
+							   PCT_IBUF_IO(100));
 	}
 
 	srv_main_thread_op_info = "reserving kernel mutex";
@@ -3065,6 +3347,10 @@
 	}
 	mutex_exit(&kernel_mutex);
 
+#ifdef UNIV_DEBUG
+	if (srv_flush_checkpoint_debug == 1)
+		goto skip_flush;
+#endif
 flush_loop:
 	srv_main_thread_op_info = "flushing buffer pool pages";
 	srv_main_flush_loops++;
@@ -3105,6 +3391,9 @@
 		goto flush_loop;
 	}
 
+#ifdef UNIV_DEBUG
+skip_flush:
+#endif
 	srv_main_thread_op_info = "reserving kernel mutex";
 
 	mutex_enter(&kernel_mutex);
@@ -3193,6 +3482,7 @@
 	srv_slot_t*	slot;
 	ulint		retries = 0;
 	ulint		n_total_purged = ULINT_UNDEFINED;
+	ulint		next_itr_time;
 
 	ut_a(srv_n_purge_threads == 1);
 
@@ -3213,9 +3503,12 @@
 
 	mutex_exit(&kernel_mutex);
 
+	next_itr_time = ut_time_ms();
+
 	while (srv_shutdown_state != SRV_SHUTDOWN_EXIT_THREADS) {
 
 		ulint	n_pages_purged = 0;
+		ulint	cur_time;
 
 		/* If there are very few records to purge or the last
 		purge didn't purge any records then wait for activity.
@@ -3262,6 +3555,16 @@
 		} while (n_pages_purged > 0 && !srv_fast_shutdown);
 
 		srv_sync_log_buffer_in_background();
+
+		cur_time = ut_time_ms();
+		if (next_itr_time > cur_time) {
+			os_thread_sleep(ut_min(1000000,
+					(next_itr_time - cur_time)
+					 * 1000));
+			next_itr_time = ut_time_ms() + 1000;
+		} else {
+			next_itr_time = cur_time + 1000;
+		}
 	}
 
 	mutex_enter(&kernel_mutex);
--- a/storage/innobase/srv/srv0start.c
+++ b/storage/innobase/srv/srv0start.c
@@ -1237,6 +1237,9 @@
 	} else if (0 == ut_strcmp(srv_file_flush_method_str, "O_DIRECT")) {
 		srv_unix_file_flush_method = SRV_UNIX_O_DIRECT;
 
+	} else if (0 == ut_strcmp(srv_file_flush_method_str, "ALL_O_DIRECT")) {
+		srv_unix_file_flush_method = SRV_UNIX_ALL_O_DIRECT;
+
 	} else if (0 == ut_strcmp(srv_file_flush_method_str, "littlesync")) {
 		srv_unix_file_flush_method = SRV_UNIX_LITTLESYNC;
 
--- a/storage/innobase/trx/trx0purge.c
+++ b/storage/innobase/trx/trx0purge.c
@@ -392,10 +392,10 @@
 	trx_sys->rseg_history_len++;
 	mutex_exit(&kernel_mutex);
 
-	if (!(trx_sys->rseg_history_len % srv_purge_batch_size)) {
+//	if (!(trx_sys->rseg_history_len % srv_purge_batch_size)) { /*should wake up always*/
 		/* Inform the purge thread that there is work to do. */
 		srv_wake_purge_thread_if_not_active();
-	}
+//	}
 }
 
 /**********************************************************************//**
--- a/storage/innobase/trx/trx0trx.c
+++ b/storage/innobase/trx/trx0trx.c
@@ -984,6 +984,7 @@
 	trx->read_view = NULL;
 
 	if (lsn) {
+		ulint	flush_log_at_trx_commit;
 
 		mutex_exit(&kernel_mutex);
 
@@ -992,6 +993,12 @@
 			trx_undo_insert_cleanup(trx);
 		}
 
+		if (srv_use_global_flush_log_at_trx_commit) {
+			flush_log_at_trx_commit = thd_flush_log_at_trx_commit(NULL);
+		} else {
+			flush_log_at_trx_commit = thd_flush_log_at_trx_commit(trx->mysql_thd);
+		}
+
 		/* NOTE that we could possibly make a group commit more
 		efficient here: call os_thread_yield here to allow also other
 		trxs to come to commit! */
@@ -1023,9 +1030,9 @@
 		if (trx->flush_log_later) {
 			/* Do nothing yet */
 			trx->must_flush_log_later = TRUE;
-		} else if (srv_flush_log_at_trx_commit == 0) {
+		} else if (flush_log_at_trx_commit == 0) {
 			/* Do nothing */
-		} else if (srv_flush_log_at_trx_commit == 1) {
+		} else if (flush_log_at_trx_commit == 1) {
 			if (srv_unix_file_flush_method == SRV_UNIX_NOSYNC) {
 				/* Write the log but do not flush it to disk */
 
@@ -1037,7 +1044,7 @@
 
 				log_write_up_to(lsn, LOG_WAIT_ONE_GROUP, TRUE);
 			}
-		} else if (srv_flush_log_at_trx_commit == 2) {
+		} else if (flush_log_at_trx_commit == 2) {
 
 			/* Write the log but do not flush it to disk */
 
@@ -1701,16 +1708,23 @@
 	trx_t*	trx)	/*!< in: trx handle */
 {
 	ib_uint64_t	lsn	= trx->commit_lsn;
+	ulint		flush_log_at_trx_commit;
 
 	ut_a(trx);
 
 	trx->op_info = "flushing log";
 
+	if (srv_use_global_flush_log_at_trx_commit) {
+		flush_log_at_trx_commit = thd_flush_log_at_trx_commit(NULL);
+	} else {
+		flush_log_at_trx_commit = thd_flush_log_at_trx_commit(trx->mysql_thd);
+	}
+
 	if (!trx->must_flush_log_later) {
 		/* Do nothing */
-	} else if (srv_flush_log_at_trx_commit == 0) {
+	} else if (flush_log_at_trx_commit == 0) {
 		/* Do nothing */
-	} else if (srv_flush_log_at_trx_commit == 1) {
+	} else if (flush_log_at_trx_commit == 1) {
 		if (srv_unix_file_flush_method == SRV_UNIX_NOSYNC) {
 			/* Write the log but do not flush it to disk */
 
@@ -1721,7 +1735,7 @@
 
 			log_write_up_to(lsn, LOG_WAIT_ONE_GROUP, TRUE);
 		}
-	} else if (srv_flush_log_at_trx_commit == 2) {
+	} else if (flush_log_at_trx_commit == 2) {
 
 		/* Write the log but do not flush it to disk */
 
@@ -1969,6 +1983,8 @@
 	/*--------------------------------------*/
 
 	if (lsn) {
+		ulint	flush_log_at_trx_commit;
+
 		/* Depending on the my.cnf options, we may now write the log
 		buffer to the log files, making the prepared state of the
 		transaction durable if the OS does not crash. We may also
@@ -1988,9 +2004,15 @@
 
 		mutex_exit(&kernel_mutex);
 
-		if (srv_flush_log_at_trx_commit == 0) {
+		if (srv_use_global_flush_log_at_trx_commit) {
+			flush_log_at_trx_commit = thd_flush_log_at_trx_commit(NULL);
+		} else {
+			flush_log_at_trx_commit = thd_flush_log_at_trx_commit(trx->mysql_thd);
+		}
+
+		if (flush_log_at_trx_commit == 0) {
 			/* Do nothing */
-		} else if (srv_flush_log_at_trx_commit == 1) {
+		} else if (flush_log_at_trx_commit == 1) {
 			if (srv_unix_file_flush_method == SRV_UNIX_NOSYNC) {
 				/* Write the log but do not flush it to disk */
 
@@ -2002,7 +2024,7 @@
 
 				log_write_up_to(lsn, LOG_WAIT_ONE_GROUP, TRUE);
 			}
-		} else if (srv_flush_log_at_trx_commit == 2) {
+		} else if (flush_log_at_trx_commit == 2) {
 
 			/* Write the log but do not flush it to disk */
 
--- a/mysql-test/include/default_mysqld.cnf
+++ b/mysql-test/include/default_mysqld.cnf
@@ -29,7 +29,7 @@
 max_heap_table_size=        1M
 
 loose-innodb_data_file_path=      ibdata1:10M:autoextend
-loose-innodb_buffer_pool_size=    8M
+loose-innodb_buffer_pool_size=    32M
 loose-innodb_write_io_threads=    2
 loose-innodb_read_io_threads=     2
 loose-innodb_log_buffer_size=     1M
--- a/mysql-test/suite/innodb/r/innodb.result
+++ b/mysql-test/suite/innodb/r/innodb.result
@@ -1678,7 +1678,7 @@
 drop table t1;
 SELECT variable_value FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_buffer_pool_pages_total';
 variable_value
-511
+2047
 SELECT variable_value FROM information_schema.global_status WHERE LOWER(variable_name) = 'innodb_page_size';
 variable_value
 16384
--- /dev/null
+++ b/mysql-test/suite/innodb/r/percona_flush_contiguous_neighbors.result
@@ -0,0 +1,21 @@
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (id INT AUTO_INCREMENT, foo CHAR(255), PRIMARY KEY (id)) ENGINE=InnoDB;
+INSERT INTO t1(foo) VALUES ('a'), ('b');
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/suite/innodb/t/percona_flush_contiguous_neighbors-master.opt
@@ -0,0 +1 @@
+--innodb_flush_neighbor_pages=cont
--- /dev/null
+++ b/mysql-test/suite/innodb/t/percona_flush_contiguous_neighbors.test
@@ -0,0 +1,36 @@
+# Test for innodb_flush_neighbor_pages=contiguous.
+# The test is very crude: we simply overflow the buffer pool with such a number of
+# new/modified pages that some flushing is bound to happen.
+
+--source include/have_innodb.inc
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+CREATE TABLE t1 (id INT AUTO_INCREMENT, foo CHAR(255), PRIMARY KEY (id)) ENGINE=InnoDB;
+
+INSERT INTO t1(foo) VALUES ('a'), ('b');
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+INSERT INTO t1(foo) SELECT foo FROM t1;
+
+# TODO: cannot record a stable value here.  A check of > 0 should be enough,
+# but the variable is not accessible through INFORMATION_SCHEMA currently.
+# SHOW GLOBAL STATUS LIKE 'Innodb_buffer_pool_pages_flushed';
+
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/suite/innodb/r/percona_sync_flush.result
@@ -0,0 +1,35 @@
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (id INT AUTO_INCREMENT, foo CHAR(255), PRIMARY KEY (id)) ENGINE=InnoDB;
+SET @@global.innodb_flush_checkpoint_debug=1;
+INSERT INTO t1(foo) VALUES ('a'), ('b');
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+INSERT INTO t1(foo) SELECT foo FROM t1;
+UPDATE t1 SET foo='c';
+SET @@global.innodb_flush_checkpoint_debug=0;
+UPDATE t1 SET foo='d' WHERE foo='c';
+DROP TABLE t1;
--- /dev/null
+++ b/mysql-test/suite/innodb/t/percona_sync_flush.test
@@ -0,0 +1,33 @@
+# Test for InnoDB sync state flushing.
+
+--source include/have_innodb.inc
+--source include/have_debug.inc
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+CREATE TABLE t1 (id INT AUTO_INCREMENT, foo CHAR(255), PRIMARY KEY (id)) ENGINE=InnoDB;
+
+# It is hard to get to InnoDB sync state flushing in MTR with regular workload.  Perhaps
+# it is possible with many parallel connections, but that would be brittle anyway.
+# So, just disable preflushing and checkpointing and issue simple workload.
+SET @@global.innodb_flush_checkpoint_debug=1;
+
+INSERT INTO t1(foo) VALUES ('a'), ('b');
+
+let $rep=0;
+while ($rep < 14)
+{
+        INSERT INTO t1(foo) SELECT foo FROM t1;
+        UPDATE t1 SET foo='c';
+        inc $rep;
+}
+
+# By now checkpoint age should be well past sync flush point.  Allow
+# preflushing/checkpointing again and do some work in order to do the sync flush.
+SET @@global.innodb_flush_checkpoint_debug=0;
+
+UPDATE t1 SET foo='d' WHERE foo='c';
+
+DROP TABLE t1;
--- a/mysql-test/suite/sys_vars/r/all_vars.result
+++ b/mysql-test/suite/sys_vars/r/all_vars.result
@@ -4,6 +4,7 @@
 insert into t2 select variable_name from information_schema.global_variables;
 insert into t2 select variable_name from information_schema.session_variables;
 delete from t2 where variable_name='innodb_change_buffering_debug';
+delete from t2 where variable_name='innodb_flush_checkpoint_debug';
 update t2 set variable_name= replace(variable_name, "PERFORMANCE_SCHEMA_", "PFS_");
 select variable_name as `There should be *no* long test name listed below:` from t2
 where length(variable_name) > 50;
--- a/mysql-test/suite/sys_vars/t/all_vars.test
+++ b/mysql-test/suite/sys_vars/t/all_vars.test
@@ -47,8 +47,9 @@
 insert into t2 select variable_name from information_schema.global_variables;
 insert into t2 select variable_name from information_schema.session_variables;
 
-# This is only present in debug builds.
+# These are only present in debug builds.
 delete from t2 where variable_name='innodb_change_buffering_debug';
+delete from t2 where variable_name='innodb_flush_checkpoint_debug';
 
 # Performance schema variables are too long for files named
 # 'mysql-test/suite/sys_vars/t/' ...
--- a/mysql-test/suite/innodb/t/innodb_cmp_drop_table-master.opt
+++ b/mysql-test/suite/innodb/t/innodb_cmp_drop_table-master.opt
@@ -1 +1 @@
---innodb-buffer-pool-size=8M
+--innodb-buffer-pool-size=32M
--- a/mysql-test/suite/innodb/t/innodb_cmp_drop_table.test
+++ b/mysql-test/suite/innodb/t/innodb_cmp_drop_table.test
@@ -36,13 +36,14 @@
 
 -- disable_query_log
 
--- let $i = 400
+-- let $i = 4000
+begin;
 while ($i)
 {
   insert into t2 values(repeat('abcdefghijklmnopqrstuvwxyz',1000));
   dec $i;
 }
-
+commit;
 -- enable_query_log
 
 # now there should be no 8K pages in the buffer pool