MDEV-8303; Dumping buffer pool noisy in the logs.

Added new dynamic configuration variable innodb_buf_dump_status_frequency
to configure how often buffer pool dump status is printed in the logs.
A number between [0, 100] that tells how oftern buffer pool dump status
in percentages should be printed. E.g. 10 means that buffer pool dump
status is printed when every 10% of number of buffer pool pages are
dumped. Default is 0 (only start and end status is printed).

mysql-test/suite/sys_vars/r/innodb_buf_dump_status_frequency_basic.result

+SET @start_innodb_buf_dump_status_frequency = @@global.innodb_buf_dump_status_frequency;
+SELECT @start_innodb_buf_dump_status_frequency;
+@start_innodb_buf_dump_status_frequency
+0
+SELECT COUNT(@@global.innodb_buf_dump_status_frequency);
+COUNT(@@global.innodb_buf_dump_status_frequency)
+1
+SET @@global.innodb_buf_dump_status_frequency = 20;
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+20
+SET @@global.innodb_buf_dump_status_frequency = 0;
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+0
+SET @@global.innodb_buf_dump_status_frequency = 100;
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+100
+SET @@global.innodb_buf_dump_status_frequency = -1;
+Warnings:
+Warning	1292	Truncated incorrect innodb_buf_dump_status_frequency value: '-1'
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+0
+SET @@global.innodb_buf_dump_status_frequency = 101;
+Warnings:
+Warning	1292	Truncated incorrect innodb_buf_dump_status_frequency value: '101'
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+100
+SET @@global.innodb_buf_dump_status_frequency = 10.5;
+ERROR 42000: Incorrect argument type to variable 'innodb_buf_dump_status_frequency'
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+100
+SET @@global.innodb_buf_dump_status_frequency = "abc";
+ERROR 42000: Incorrect argument type to variable 'innodb_buf_dump_status_frequency'
+SELECT @@global.innodb_buf_dump_status_frequency;
+@@global.innodb_buf_dump_status_frequency
+100
+SET @@global.innodb_buf_dump_status_frequency = @start_innodb_buf_dump_status_frequency;

mysql-test/suite/sys_vars/t/innodb_buf_dump_status_frequency_basic.test

+--source include/have_innodb.inc
+--source include/load_sysvars.inc
+
+SET @start_innodb_buf_dump_status_frequency = @@global.innodb_buf_dump_status_frequency;
+SELECT @start_innodb_buf_dump_status_frequency;
+
+SELECT COUNT(@@global.innodb_buf_dump_status_frequency);
+
+# test valid value
+SET @@global.innodb_buf_dump_status_frequency = 20;
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+# test valid min
+SET @@global.innodb_buf_dump_status_frequency = 0;
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+# test valid max
+SET @@global.innodb_buf_dump_status_frequency = 100;
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+# test invalid value < min
+SET @@global.innodb_buf_dump_status_frequency = -1;
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+# test invalid value > max
+SET @@global.innodb_buf_dump_status_frequency = 101;
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+# test wrong type
+--Error ER_WRONG_TYPE_FOR_VAR
+SET @@global.innodb_buf_dump_status_frequency = 10.5;
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+--Error ER_WRONG_TYPE_FOR_VAR
+SET @@global.innodb_buf_dump_status_frequency = "abc";
+SELECT @@global.innodb_buf_dump_status_frequency;
+
+SET @@global.innodb_buf_dump_status_frequency = @start_innodb_buf_dump_status_frequency;
+

storage/innobase/buf/buf0dump.cc

@@ -211,6 +211,8 @@ buf_dump(
 		buf_dump_t*		dump;
 		ulint			n_pages;
 		ulint			j;
+		ulint			limit;
+		ulint			counter;
 
 		buf_pool = buf_pool_from_array(i);
 
@@ -254,6 +256,9 @@ buf_dump(
 
 		buf_pool_mutex_exit(buf_pool);
 
+		limit = (ulint)((double)n_pages * ((double)srv_buf_dump_status_frequency / (double)100));
+		counter = 0;
+
 		for (j = 0; j < n_pages && !SHOULD_QUIT(); j++) {
 			ret = fprintf(f, ULINTPF "," ULINTPF "\n",
 				      BUF_DUMP_SPACE(dump[j]),
@@ -268,7 +273,14 @@ buf_dump(
 				return;
 			}
 
-			if (j % 128 == 0) {
+			counter++;
+
+			/* Print buffer pool dump status only if
+			srv_buf_dump_status_frequency is > 0 and
+			we have processed that amount of pages. */
+			if (srv_buf_dump_status_frequency &&
+			    counter == limit) {
+				counter = 0;
 				buf_dump_status(
 					STATUS_INFO,
 					"Dumping buffer pool "

storage/innobase/handler/ha_innodb.cc

@@ -18985,6 +18985,14 @@ static MYSQL_SYSVAR_BOOL(disable_background_merge,
   NULL, NULL, FALSE);
 #endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
 
+static MYSQL_SYSVAR_ULONG(buf_dump_status_frequency, srv_buf_dump_status_frequency,
+  PLUGIN_VAR_RQCMDARG,
+  "A number between [0, 100] that tells how oftern buffer pool dump status "
+  "in percentages should be printed. E.g. 10 means that buffer pool dump "
+  "status is printed when every 10% of number of buffer pool pages are "
+  "dumped. Default is 0 (only start and end status is printed).",
+  NULL, NULL, 0, 0, 100, 0);
+
 #ifdef WITH_INNODB_DISALLOW_WRITES
 /*******************************************************
  *    innobase_disallow_writes variable definition     *
@@ -19485,6 +19493,7 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(debug_force_scrubbing),
 #endif
   MYSQL_SYSVAR(instrument_semaphores),
+  MYSQL_SYSVAR(buf_dump_status_frequency),
   NULL
 };
 

storage/innobase/include/srv0srv.h

@@ -563,6 +563,9 @@ extern ulong	srv_fatal_semaphore_wait_threshold;
 /** Enable semaphore request instrumentation */
 extern my_bool srv_instrument_semaphores;
 
+/** Buffer pool dump status frequence in percentages */
+extern ulong srv_buf_dump_status_frequency;
+
 # ifdef UNIV_PFS_THREAD
 /* Keys to register InnoDB threads with performance schema */
 extern mysql_pfs_key_t	buf_page_cleaner_thread_key;

storage/innobase/srv/srv0srv.cc

@@ -544,6 +544,9 @@ current_time % 5 != 0. */
 /** Simulate compression failures. */
 UNIV_INTERN uint srv_simulate_comp_failures = 0;
 
+/** Buffer pool dump status frequence in percentages */
+UNIV_INTERN ulong srv_buf_dump_status_frequency = 0;
+
 /** Acquire the system_mutex. */
 #define srv_sys_mutex_enter() do {			\
 	mutex_enter(&srv_sys->mutex);			\

storage/xtradb/buf/buf0dump.cc

@@ -211,6 +211,8 @@ buf_dump(
 		buf_dump_t*		dump;
 		ulint			n_pages;
 		ulint			j;
+		ulint			limit;
+		ulint			counter;
 
 		buf_pool = buf_pool_from_array(i);
 
@@ -254,6 +256,9 @@ buf_dump(
 
 		mutex_exit(&buf_pool->LRU_list_mutex);
 
+		limit = (ulint)((double)n_pages * ((double)srv_buf_dump_status_frequency / (double)100));
+		counter = 0;
+
 		for (j = 0; j < n_pages && !SHOULD_QUIT(); j++) {
 			ret = fprintf(f, ULINTPF "," ULINTPF "\n",
 				      BUF_DUMP_SPACE(dump[j]),
@@ -268,7 +273,14 @@ buf_dump(
 				return;
 			}
 
-			if (j % 128 == 0) {
+			counter++;
+
+			/* Print buffer pool dump status only if
+			srv_buf_dump_status_frequency is > 0 and
+			we have processed that amount of pages. */
+			if (srv_buf_dump_status_frequency &&
+			    counter == limit) {
+				counter = 0;
 				buf_dump_status(
 					STATUS_INFO,
 					"Dumping buffer pool "

storage/xtradb/handler/ha_innodb.cc

@@ -20151,6 +20151,14 @@ static MYSQL_SYSVAR_BOOL(disable_background_merge,
   NULL, NULL, FALSE);
 #endif /* UNIV_DEBUG || UNIV_IBUF_DEBUG */
 
+static MYSQL_SYSVAR_ULONG(buf_dump_status_frequency, srv_buf_dump_status_frequency,
+  PLUGIN_VAR_RQCMDARG,
+  "A number between [0, 100] that tells how oftern buffer pool dump status "
+  "in percentages should be printed. E.g. 10 means that buffer pool dump "
+  "status is printed when every 10% of number of buffer pool pages are "
+  "dumped. Default is 0 (only start and end status is printed).",
+  NULL, NULL, 0, 0, 100, 0);
+
 #ifdef WITH_INNODB_DISALLOW_WRITES
 /*******************************************************
  *    innobase_disallow_writes variable definition     *
@@ -20728,6 +20736,7 @@ static struct st_mysql_sys_var* innobase_system_variables[]= {
   MYSQL_SYSVAR(debug_force_scrubbing),
 #endif
   MYSQL_SYSVAR(instrument_semaphores),
+  MYSQL_SYSVAR(buf_dump_status_frequency),
   NULL
 };
 

storage/xtradb/include/srv0srv.h

@@ -706,6 +706,9 @@ extern ulong	srv_fatal_semaphore_wait_threshold;
 /** Enable semaphore request instrumentation */
 extern my_bool srv_instrument_semaphores;
 
+/** Buffer pool dump status frequence in percentages */
+extern ulong srv_buf_dump_status_frequency;
+
 # ifdef UNIV_PFS_THREAD
 /* Keys to register InnoDB threads with performance schema */
 extern mysql_pfs_key_t	buf_page_cleaner_thread_key;

storage/xtradb/srv/srv0srv.cc

@@ -688,6 +688,9 @@ current_time % 5 != 0. */
 #endif /* MEM_PERIODIC_CHECK */
 # define	SRV_MASTER_DICT_LRU_INTERVAL		(47)
 
+/** Buffer pool dump status frequence in percentages */
+UNIV_INTERN ulong srv_buf_dump_status_frequency = 0;
+
 /** Acquire the system_mutex. */
 #define srv_sys_mutex_enter() do {			\
 	mutex_enter(&srv_sys->mutex);			\