MDEV-32841 Add tests for new counters.

Only add innodb_async_reads/writes_total_count here.
For all other counters, writing reproducible tests is rather tricky.

mysql-test/suite/innodb/r/innodb_buffer_pool_load_now.result

@@ -23,12 +23,21 @@ WHERE table_name = '`test`.`ib_bp_test`';
 PAGE_NUMBER
 select count(*) from ib_bp_test LIMIT 0;
 count(*)
+select variable_value into @innodb_async_reads_total_count_before
+from information_schema.global_status
+where variable_name='innodb_async_reads_total_count';
 SET GLOBAL innodb_buffer_pool_load_now = ON;
 SELECT variable_value
 FROM information_schema.global_status
 WHERE LOWER(variable_name) = 'innodb_buffer_pool_load_status';
 variable_value
 Buffer pool(s) load completed at TIMESTAMP_NOW
+select  (cast(variable_value as unsigned) >
+cast(@innodb_async_reads_total_count_before as unsigned))
+as async_reads_grow
+from information_schema.global_status where variable_name='innodb_async_reads_total_count';
+async_reads_grow
+1
 SELECT COUNT(*) FROM information_schema.innodb_buffer_page_lru
 WHERE table_name = '`test`.`ib_bp_test`';
 COUNT(*)

mysql-test/suite/innodb/r/page_cleaner.result

@@ -3,12 +3,22 @@ SET @save_pct_lwm= @@GLOBAL.innodb_max_dirty_pages_pct_lwm;
 SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.0;
 SET GLOBAL innodb_max_dirty_pages_pct=0.0;
 SET GLOBAL innodb_max_dirty_pages_pct=90.0;
+select variable_value into @innodb_async_writes_total_count_before
+from information_schema.global_status
+where variable_name='innodb_async_writes_total_count';
 CREATE TABLE t ENGINE=InnoDB SELECT * FROM seq_1_to_10000;
 SELECT variable_value>0 FROM information_schema.global_status
 WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY';
 variable_value>0
 1
 SET GLOBAL innodb_max_dirty_pages_pct=0.0;
+select (cast(variable_value as unsigned) >
+cast(@innodb_async_writes_total_count_before as unsigned))
+as innodb_async_writes_grow
+from information_schema.global_status
+where variable_name='innodb_async_writes_total_count';
+innodb_async_writes_grow
+1
 DROP TABLE t;
 SET GLOBAL innodb_max_dirty_pages_pct = @save_pct;
 SET GLOBAL innodb_max_dirty_pages_pct_lwm = @save_pct_lwm;

mysql-test/suite/innodb/t/innodb_buffer_pool_load_now.test

@@ -88,6 +88,11 @@ WHERE table_name = '`test`.`ib_bp_test`';
 # Load the table so that entries in the I_S table do not appear as NULL
 select count(*) from ib_bp_test LIMIT 0;
 
+# Check that async reads are executed during bufferpool load
+select variable_value into @innodb_async_reads_total_count_before
+ from information_schema.global_status
+ where variable_name='innodb_async_reads_total_count';
+
 # Load
 SET GLOBAL innodb_buffer_pool_load_now = ON;
 
@@ -108,6 +113,12 @@ FROM information_schema.global_status
 WHERE LOWER(variable_name) = 'innodb_buffer_pool_load_status';
 --enable_warnings
 
+select  (cast(variable_value as unsigned) >
+  cast(@innodb_async_reads_total_count_before as unsigned))
+  as async_reads_grow
+  from information_schema.global_status where variable_name='innodb_async_reads_total_count';
+
+
 SELECT COUNT(*) FROM information_schema.innodb_buffer_page_lru
 WHERE table_name = '`test`.`ib_bp_test`';
 

mysql-test/suite/innodb/t/page_cleaner.test

@@ -14,6 +14,9 @@ WHERE variable_name = 'INNODB_BUFFER_POOL_PAGES_DIRTY';
 --source include/wait_condition.inc
 
 SET GLOBAL innodb_max_dirty_pages_pct=90.0;
+select variable_value into @innodb_async_writes_total_count_before
+ from information_schema.global_status
+ where variable_name='innodb_async_writes_total_count';
 
 CREATE TABLE t ENGINE=InnoDB SELECT * FROM seq_1_to_10000;
 
@@ -24,6 +27,13 @@ SET GLOBAL innodb_max_dirty_pages_pct=0.0;
 
 # Without the MDEV-24917 fix, we would time out here.
 --source include/wait_condition.inc
+
+select (cast(variable_value as unsigned) >
+ cast(@innodb_async_writes_total_count_before as unsigned))
+ as innodb_async_writes_grow
+ from information_schema.global_status
+ where variable_name='innodb_async_writes_total_count';
+
 DROP TABLE t;
 
 SET GLOBAL innodb_max_dirty_pages_pct = @save_pct;