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MDEV-31953 madvise(..., MADV_FREE) is causing a performance regression / MDEV-24670 avoid OOM by linux kernel co-operative memory management #2805

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Nov 18, 2023
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MDEV-31953 madvise(..., MADV_FREE) is causing a performance regression / MDEV-24670 avoid OOM by linux kernel co-operative memory management #2805

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27 changes: 27 additions & 0 deletions mysql-test/suite/innodb/r/mem_pressure.result
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Original file line number Diff line number Diff line change
@@ -0,0 +1,27 @@
#
# MDEV-24670 avoid OOM by linux kernel co-operative memory management
#
set @save_dbug=@@debug_dbug;
set @save_limit=@@GLOBAL.innodb_limit_optimistic_insert_debug;
set @save_lag_wait=@@GLOBAL.innodb_max_purge_lag_wait;
set GLOBAL innodb_max_purge_lag_wait=0;
CREATE TABLE t1 (t TEXT) ENGINE=InnoDB;
SET GLOBAL innodb_limit_optimistic_insert_debug=2;
SET unique_checks=0, foreign_key_checks=0;
INSERT INTO t1 SELECT CONCAT(REPEAT('junk text', 500), CAST(seq AS CHAR)) FROM seq_1_to_1000;
SET GLOBAL innodb_limit_optimistic_insert_debug=@save_limit;
SET GLOBAL innodb_max_purge_lag_wait=@save_lag_wait;
DROP TABLE t1;
SELECT CAST(VARIABLE_VALUE AS INTEGER) INTO @dirty_prev
FROM INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE VARIABLE_NAME='Innodb_buffer_pool_pages_dirty';
set debug_dbug="d,trigger_garbage_collection";
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SET GLOBAL innodb_buffer_pool_size=@@innodb_buffer_pool_size;
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SELECT CAST(VARIABLE_VALUE AS INTEGER) < @dirty_prev AS LESS_DIRTY_IS_GOOD
FROM INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE VARIABLE_NAME='Innodb_buffer_pool_pages_dirty';
LESS_DIRTY_IS_GOOD
1
FOUND 1 /InnoDB: Memory pressure event freed/ in mysqld.1.err
set debug_dbug=@save_dbug;
# End of 10.11 tests
44 changes: 44 additions & 0 deletions mysql-test/suite/innodb/t/mem_pressure.test
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--source include/have_debug.inc
--source include/linux.inc
--source include/not_embedded.inc
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--source include/have_innodb.inc
--source include/have_sequence.inc

--echo #
--echo # MDEV-24670 avoid OOM by linux kernel co-operative memory management
--echo #

set @save_dbug=@@debug_dbug;

set @save_limit=@@GLOBAL.innodb_limit_optimistic_insert_debug;
set @save_lag_wait=@@GLOBAL.innodb_max_purge_lag_wait;
set GLOBAL innodb_max_purge_lag_wait=0;

CREATE TABLE t1 (t TEXT) ENGINE=InnoDB;
SET GLOBAL innodb_limit_optimistic_insert_debug=2;
SET unique_checks=0, foreign_key_checks=0;
INSERT INTO t1 SELECT CONCAT(REPEAT('junk text', 500), CAST(seq AS CHAR)) FROM seq_1_to_1000;

SET GLOBAL innodb_limit_optimistic_insert_debug=@save_limit;
SET GLOBAL innodb_max_purge_lag_wait=@save_lag_wait;

DROP TABLE t1;

SELECT CAST(VARIABLE_VALUE AS INTEGER) INTO @dirty_prev
FROM INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE VARIABLE_NAME='Innodb_buffer_pool_pages_dirty';

set debug_dbug="d,trigger_garbage_collection";
SET GLOBAL innodb_buffer_pool_size=@@innodb_buffer_pool_size;

SELECT CAST(VARIABLE_VALUE AS INTEGER) < @dirty_prev AS LESS_DIRTY_IS_GOOD
FROM INFORMATION_SCHEMA.GLOBAL_STATUS
WHERE VARIABLE_NAME='Innodb_buffer_pool_pages_dirty';

let SEARCH_FILE= $MYSQLTEST_VARDIR/log/mysqld.1.err;
let SEARCH_PATTERN= InnoDB: Memory pressure event freed;
--source include/search_pattern_in_file.inc

set debug_dbug=@save_dbug;

--echo # End of 10.11 tests
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