[LTP] [PATCH v2 0/4] controllers/memcg: fixes for CPU nodes on newer kernels

[LTP] [PATCH v2 0/4] controllers/memcg: fixes for CPU nodes on newer kernels

[Krzysztof Kozlowski]

Hi,

Changes since v1
================
1. Address Richard's review by echoing the new node-adjusted limit and
   counting nodes in easier way.

Description
===========
Rebased on top of latest master - no other dependencies.

The problem is that since v5.9 kernel, not only per-CPU but also
per-node kernel memory is accounted to group.  Creating a subgroup on
v5.11 kernel on a two-node machine eats ~440 kB by itself in kernel
memory.

The patchset tries to take it into account and adjust the memory limits.
Have in mind however that kernel might change such accounting in the
future.

Best regards,
Krzysztof

Krzysztof Kozlowski (4):
  controllers/memcg: account per-node kernel memory
  controllers/memcg: fix memcg_stat_test on two node machines
  controllers/memcg: fail early to avoid possible false-positives
  controllers/memcg: check status of commands using interface

 .../memcg/functional/memcg_failcnt.sh         |  4 +-
 .../controllers/memcg/functional/memcg_lib.sh | 37 +++++++++++++++++-
 .../memcg_max_usage_in_bytes_test.sh          | 10 ++---
 .../memcg_memsw_limit_in_bytes_test.sh        |  8 ++--
 .../memcg_move_charge_at_immigrate_test.sh    |  4 +-
 .../memcg/functional/memcg_stat_test.sh       | 38 ++++++++++---------
 .../memcg/functional/memcg_subgroup_charge.sh | 14 +++----
 .../functional/memcg_usage_in_bytes_test.sh   |  4 +-
 .../functional/memcg_use_hierarchy_test.sh    | 14 ++++---
 9 files changed, 84 insertions(+), 49 deletions(-)

-- 
2.30.2

[LTP] [PATCH v2 1/4] controllers/memcg: account per-node kernel memory

[Krzysztof Kozlowski]

Recent Linux kernels charge groups also with kernel memory.  This is not
limited only to process-allocated memory but also cgroup-handling code
memory as well.

For example since kernel v5.9 with commit 3e38e0aaca9e ("mm: memcg:
charge memcg percpu memory to the parent cgroup") creating a subgroup
causes several kernel allocations towards this group.

These additional kernel memory allocations are proportional to number of
CPUs and number of nodes.

On c4.8xlarge AWS instance with 36 cores in two nodes with v5.11 Linux
kernel the memcg_subgroup_charge and memcg_use_hierarchy_test tests were
failing:

    memcg_use_hierarchy_test 1 TINFO: timeout per run is 0h 5m 0s
    memcg_use_hierarchy_test 1 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
    memcg_use_hierarchy_test 1 TINFO: test if one of the ancestors goes over its limit, the proces will be killed
    mkdir: cannot create directory ?subgroup?: Cannot allocate memory
    /home/ubuntu/ltp-install/testcases/bin/memcg_use_hierarchy_test.sh: 26: cd: can't cd to subgroup
    memcg_use_hierarchy_test 1 TINFO: Running memcg_process --mmap-lock1 -s 8192
    memcg_use_hierarchy_test 1 TFAIL: process  is not killed
    rmdir: failed to remove 'subgroup': No such file or directory

The kernel was unable to create the subgroup (mkdir returned -ENOMEM)
due to this additional per-node kernel memory allocations.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../controllers/memcg/functional/memcg_lib.sh | 35 +++++++++++++++++++
 .../memcg/functional/memcg_subgroup_charge.sh |  8 ++---
 .../functional/memcg_use_hierarchy_test.sh    |  6 ++--
 3 files changed, 41 insertions(+), 8 deletions(-)

diff --git a/testcases/kernel/controllers/memcg/functional/memcg_lib.sh b/testcases/kernel/controllers/memcg/functional/memcg_lib.sh
index dad66c798e19..c8b5df2b45f7 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_lib.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_lib.sh
@@ -63,6 +63,41 @@ memcg_require_hierarchy_disabled()
 	fi
 }
 
+# Kernel memory allocated for the process is also charged.  It might depend on
+# the number of CPUs and number of nodes. For example on kernel v5.11
+# additionally total_cpus (plus 1 or 2) pages are charged to the group via
+# kernel memory.  For a two-node machine, additional 108 pages kernel memory
+# are charged to the group.
+#
+# Adjust the limit to account such per-CPU and per-node kernel memory.
+# $1 - expected cgroup memory limit value to adjust
+memcg_adjust_limit_for_kmem()
+{
+	[ $# -ne 1 ] && tst_brk TBROK "memcg_adjust_limit_for_kmem expects 1 parameter"
+
+	local limit=$1
+
+	# Total number of CPUs
+	local total_cpus=`tst_ncpus`
+
+	# Total number of nodes
+	if [ ! -d /sys/devices/system/node/node0 ]; then
+		total_nodes=1
+	else
+		total_nodes=`ls /sys/devices/system/node/ | grep -c "node[0-9][0-9]*"`
+	fi
+
+	local node_mem=0
+	if [ $total_nodes -gt 1 ]; then
+		node_mem=$((total_nodes - 1))
+		node_mem=$((node_mem * PAGESIZE * 128))
+	fi
+
+	limit=$((limit + 4 * PAGESIZE + total_cpus * PAGESIZE + node_mem))
+
+	echo $limit
+}
+
 memcg_setup()
 {
 	if ! is_cgroup_subsystem_available_and_enabled "memory"; then
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh b/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
index 0d2b235aff7c..44fc7370eeff 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
@@ -24,16 +24,12 @@ test_subgroup()
 {
 	local limit_parent=$1
 	local limit_subgroup=$2
-	local total_cpus=`tst_ncpus`
 
-	# Kernel memory allocated for the process is also charged.
-	# It might depend on the number of CPUs. For example on kernel v5.11
-	# additionally total_cpus plus 1-2 pages are charged to the group.
 	if [ $limit_parent -ne 0 ]; then
-		limit_parent=$((limit_parent + 4 * PAGESIZE + total_cpus * PAGESIZE))
+		limit_parent=$(memcg_adjust_limit_for_kmem $limit_parent)
 	fi
 	if [ $limit_subgroup -ne 0 ]; then
-		limit_subgroup=$((limit_subgroup + 4 * PAGESIZE + total_cpus * PAGESIZE))
+		limit_subgroup=$(memcg_adjust_limit_for_kmem $limit_subgroup)
 	fi
 
 	mkdir subgroup
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh
index 8be342499ece..129f91b14c0a 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh
@@ -15,12 +15,14 @@ test1()
 {
 	tst_res TINFO "test if one of the ancestors goes over its limit, the proces will be killed"
 
+	local limit=$(memcg_adjust_limit_for_kmem $PAGESIZE)
+
 	echo 1 > memory.use_hierarchy
-	echo $PAGESIZE > memory.limit_in_bytes
+	echo $limit > memory.limit_in_bytes
 
 	mkdir subgroup
 	cd subgroup
-	test_proc_kill $((PAGESIZE * 3)) "--mmap-lock1" $((PAGESIZE * 2)) 0
+	test_proc_kill $((limit + PAGESIZE * 3)) "--mmap-lock1" $((limit + PAGESIZE * 2)) 0
 
 	cd ..
 	rmdir subgroup
-- 
2.30.2

[LTP] [PATCH v2 2/4] controllers/memcg: fix memcg_stat_test on two node machines

[Krzysztof Kozlowski]

Recent Linux kernels charge groups also with kernel memory.  This is not
limited only to process-allocated memory but also cgroup-handling code
memory as well.

For example since kernel v5.9 with commit 3e38e0aaca9e ("mm: memcg:
charge memcg percpu memory to the parent cgroup") creating a subgroup
causes several kernel allocations towards this group.

These additional kernel memory allocations are proportional to number of
CPUs and number of nodes.

On c4.8xlarge AWS instance with 36 cores in two nodes with v5.11 Linux
kernel the memcg_stat_test was failing because of unable to set memory
limit lower than current kernel memory accounted to the group:

    memcg_stat_test 5 TINFO: Test hierarchical_memory_limit with enabling hierarchical accounting
        shell code from test:
        > mkdir subgroup
        > cat memory.kmem.usage_in_bytes
        > 442368
        > echo $PAGESIZE > memory.limit_in_bytes
    /home/ubuntu/ltp-install/testcases/bin/memcg_stat_test.sh: 47: echo: echo: I/O error
    memcg_stat_test 5 TFAIL: hierarchical_memory_limit is 270336, 135168 expected

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../controllers/memcg/functional/memcg_stat_test.sh       | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
index e5eb7e5d0001..94eaa45ce0d8 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
@@ -43,12 +43,14 @@ test5()
 	tst_res TINFO "Test hierarchical_memory_limit with enabling hierarchical accounting"
 	echo 1 > memory.use_hierarchy
 
+	local limit=$(memcg_adjust_limit_for_kmem $PAGESIZES)
+
 	mkdir subgroup
-	echo $PAGESIZES > memory.limit_in_bytes
-	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
+	echo $limit > memory.limit_in_bytes
+	echo $((limit + PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
 
 	cd subgroup
-	check_mem_stat "hierarchical_memory_limit" $PAGESIZES
+	check_mem_stat "hierarchical_memory_limit" $limit
 
 	cd ..
 	rmdir subgroup
-- 
2.30.2

[LTP] [PATCH v2 3/4] controllers/memcg: fail early to avoid possible false-positives

[Krzysztof Kozlowski]

Tests require certain prerequisites. If these fail, there is no point to
continue with the test.  Trying to continue might lead to false
positives, as seen on memcg_subgroup_charge which failed to set proper
limit and did not catch actual failure:

    memcg_subgroup_charge 1 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
    memcg_subgroup_charge 1 TINFO: Test that group and subgroup have no relationship
    /home/ubuntu/ltp-install/testcases/bin/memcg_subgroup_charge.sh: 36: echo: echo: I/O error
    memcg_subgroup_charge 1 TINFO: Running memcg_process --mmap-anon -s 270336
    memcg_subgroup_charge 1 TINFO: Warming up pid: 13496
    memcg_subgroup_charge 1 TINFO: Process is still here after warm up: 13496

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../controllers/memcg/functional/memcg_failcnt.sh      |  4 ++--
 .../memcg/functional/memcg_max_usage_in_bytes_test.sh  |  2 +-
 .../functional/memcg_memsw_limit_in_bytes_test.sh      |  8 ++++----
 .../functional/memcg_move_charge_at_immigrate_test.sh  |  4 ++--
 .../controllers/memcg/functional/memcg_stat_test.sh    | 10 +++++-----
 .../memcg/functional/memcg_subgroup_charge.sh          |  2 +-
 .../memcg/functional/memcg_use_hierarchy_test.sh       | 10 +++++-----
 7 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/testcases/kernel/controllers/memcg/functional/memcg_failcnt.sh b/testcases/kernel/controllers/memcg/functional/memcg_failcnt.sh
index ce0885b73fe7..65ad82e0a2a0 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_failcnt.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_failcnt.sh
@@ -18,10 +18,10 @@ MEMORY_TO_ALLOCATE=$((MEMORY_LIMIT * 2))
 
 test()
 {
-	echo $MEMORY_LIMIT > memory.limit_in_bytes
+	ROD echo $MEMORY_LIMIT \> memory.limit_in_bytes
 
 	start_memcg_process $2 -s ${MEMORY_TO_ALLOCATE}
-	echo $MEMCG_PROCESS_PID > tasks
+	ROD echo $MEMCG_PROCESS_PID \> tasks
 
 	signal_memcg_process ${MEMORY_TO_ALLOCATE}
 	signal_memcg_process ${MEMORY_TO_ALLOCATE}
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh
index 24e9d115c19e..a0c4dd17f0f3 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh
@@ -33,7 +33,7 @@ test_max_usage_in_bytes()
 		return
 	fi
 
-	echo $MEMCG_PROCESS_PID > tasks
+	ROD echo $MEMCG_PROCESS_PID \> tasks
 	signal_memcg_process $MEM_TO_ALLOC
 	signal_memcg_process $MEM_TO_ALLOC
 
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_memsw_limit_in_bytes_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_memsw_limit_in_bytes_test.sh
index e9950a0df322..ab26cb3d1768 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_memsw_limit_in_bytes_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_memsw_limit_in_bytes_test.sh
@@ -55,7 +55,7 @@ test9()
 {
 	memcg_require_memsw
 
-	echo 10M > memory.limit_in_bytes
+	ROD echo 10M \> memory.limit_in_bytes
 
 	if tst_kvcmp -lt "2.6.31"; then
 		EXPECT_FAIL echo -1 \> memory.memsw.limit_in_bytes
@@ -68,7 +68,7 @@ test10()
 {
 	memcg_require_memsw
 
-	echo 10M > memory.limit_in_bytes
+	ROD echo 10M \> memory.limit_in_bytes
 	EXPECT_FAIL echo 1.0 \> memory.memsw.limit_in_bytes
 }
 
@@ -76,7 +76,7 @@ test11()
 {
 	memcg_require_memsw
 
-	echo 10M > memory.limit_in_bytes
+	ROD echo 10M \> memory.limit_in_bytes
 	EXPECT_FAIL echo 1xx \> memory.memsw.limit_in_bytes
 }
 
@@ -84,7 +84,7 @@ test12()
 {
 	memcg_require_memsw
 
-	echo 10M > memory.limit_in_bytes
+	ROD echo 10M \> memory.limit_in_bytes
 	EXPECT_FAIL echo xx \> memory.memsw.limit_in_bytes
 }
 
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_move_charge_at_immigrate_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_move_charge_at_immigrate_test.sh
index 272d7779770d..3c1b3394bd71 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_move_charge_at_immigrate_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_move_charge_at_immigrate_test.sh
@@ -34,10 +34,10 @@ test_move_charge()
 		return
 	fi
 
-	echo $MEMCG_PROCESS_PID > subgroup_a/tasks
+	ROD echo $MEMCG_PROCESS_PID \> subgroup_a/tasks
 	signal_memcg_process $total_size "subgroup_a/"
 
-	mkdir subgroup_b
+	ROD mkdir subgroup_b
 	echo $move_charge_mask > subgroup_b/memory.move_charge_at_immigrate
 	echo $MEMCG_PROCESS_PID > subgroup_b/tasks
 
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
index 94eaa45ce0d8..c9034f7d4b41 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
@@ -45,7 +45,7 @@ test5()
 
 	local limit=$(memcg_adjust_limit_for_kmem $PAGESIZES)
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	echo $limit > memory.limit_in_bytes
 	echo $((limit + PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
 
@@ -61,9 +61,9 @@ test6()
 	tst_res TINFO "Test hierarchical_memory_limit with disabling hierarchical accounting"
 	memcg_require_hierarchy_disabled
 
-	echo 0 > memory.use_hierarchy
+	ROD echo 0 \> memory.use_hierarchy
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	echo $PAGESIZES > memory.limit_in_bytes
 	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
 
@@ -81,7 +81,7 @@ test7()
 
 	ROD echo 1 \> memory.use_hierarchy
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	echo $PAGESIZES > memory.limit_in_bytes
 	echo $PAGESIZES > memory.memsw.limit_in_bytes
 	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
@@ -102,7 +102,7 @@ test8()
 
 	ROD echo 0 \> memory.use_hierarchy
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	echo $PAGESIZES > memory.limit_in_bytes
 	echo $PAGESIZES > memory.memsw.limit_in_bytes
 	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh b/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
index 44fc7370eeff..c28c39cf4387 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
@@ -32,7 +32,7 @@ test_subgroup()
 		limit_subgroup=$(memcg_adjust_limit_for_kmem $limit_subgroup)
 	fi
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	echo $limit_parent > memory.limit_in_bytes
 	echo $limit_subgroup > subgroup/memory.limit_in_bytes
 
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh
index 129f91b14c0a..e219823841a5 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_use_hierarchy_test.sh
@@ -17,10 +17,10 @@ test1()
 
 	local limit=$(memcg_adjust_limit_for_kmem $PAGESIZE)
 
-	echo 1 > memory.use_hierarchy
-	echo $limit > memory.limit_in_bytes
+	ROD echo 1 \> memory.use_hierarchy
+	ROD echo $limit \> memory.limit_in_bytes
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	cd subgroup
 	test_proc_kill $((limit + PAGESIZE * 3)) "--mmap-lock1" $((limit + PAGESIZE * 2)) 0
 
@@ -34,7 +34,7 @@ test2()
 
 	memcg_require_hierarchy_disabled
 
-	mkdir subgroup
+	ROD mkdir subgroup
 	EXPECT_FAIL echo 1 \> memory.use_hierarchy
 
 	rmdir subgroup
@@ -46,7 +46,7 @@ test3()
 
 	memcg_require_hierarchy_disabled
 
-	echo 1 > memory.use_hierarchy
+	ROD echo 1 > memory.use_hierarchy
 	mkdir subgroup
 	EXPECT_FAIL echo 0 \> subgroup/memory.use_hierarchy
 
-- 
2.30.2

[LTP] [PATCH v2 4/4] controllers/memcg: check status of commands using interface

[Krzysztof Kozlowski]

Most of the cgroups interface returns some valid and meaningful error
code (e.g. ENOMEM if creating subgroup failed).  Check these to be sure
that all errors are caught, like in this example:

    memcg_subgroup_charge 1 TINFO: set /dev/memcg/memory.use_hierarchy to 0 failed
    memcg_subgroup_charge 1 TINFO: Test that group and subgroup have no relationship
    /home/ubuntu/ltp-install/testcases/bin/memcg_subgroup_charge.sh: 36: echo: echo: I/O error
    memcg_subgroup_charge 1 TINFO: Running memcg_process --mmap-anon -s 270336
    memcg_subgroup_charge 1 TINFO: Warming up pid: 13496
    memcg_subgroup_charge 1 TINFO: Process is still here after warm up: 13496

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../controllers/memcg/functional/memcg_lib.sh |  2 +-
 .../memcg_max_usage_in_bytes_test.sh          |  8 +++----
 .../memcg/functional/memcg_stat_test.sh       | 24 +++++++++----------
 .../memcg/functional/memcg_subgroup_charge.sh |  4 ++--
 .../functional/memcg_usage_in_bytes_test.sh   |  4 ++--
 5 files changed, 21 insertions(+), 21 deletions(-)

diff --git a/testcases/kernel/controllers/memcg/functional/memcg_lib.sh b/testcases/kernel/controllers/memcg/functional/memcg_lib.sh
index c8b5df2b45f7..ee14a29fae81 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_lib.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_lib.sh
@@ -380,7 +380,7 @@ test_limit_in_bytes()
 	local use_memsw=$2
 	local elimit
 
-	echo $limit > memory.limit_in_bytes
+	EXPECT_PASS echo $limit \> memory.limit_in_bytes
 	if [ $use_memsw -eq 1 ]; then
 		memcg_require_memsw
 		echo $limit > memory.memsw.limit_in_bytes
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh
index a0c4dd17f0f3..6a2607c4333b 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_max_usage_in_bytes_test.sh
@@ -67,8 +67,8 @@ test2()
 	tst_res TINFO "Test memory.memsw.max_usage_in_bytes"
 	memcg_require_memsw
 
-	echo $MEM_LIMIT > memory.limit_in_bytes
-	echo $MEM_LIMIT > memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $MEM_LIMIT \> memory.limit_in_bytes
+	EXPECT_PASS echo $MEM_LIMIT \> memory.memsw.limit_in_bytes
 	test_max_usage_in_bytes 1 0
 }
 
@@ -83,8 +83,8 @@ test4()
 	tst_res TINFO "Test reset memory.memsw.max_usage_in_bytes"
 	memcg_require_memsw
 
-	echo $MEM_LIMIT > memory.limit_in_bytes
-	echo $MEM_LIMIT > memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $MEM_LIMIT \> memory.limit_in_bytes
+	EXPECT_PASS echo $MEM_LIMIT \> memory.memsw.limit_in_bytes
 	test_max_usage_in_bytes 1 1
 }
 
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
index c9034f7d4b41..0308b40bab53 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_stat_test.sh
@@ -46,8 +46,8 @@ test5()
 	local limit=$(memcg_adjust_limit_for_kmem $PAGESIZES)
 
 	ROD mkdir subgroup
-	echo $limit > memory.limit_in_bytes
-	echo $((limit + PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
+	EXPECT_PASS echo $limit \> memory.limit_in_bytes
+	EXPECT_PASS echo $((limit + PAGESIZES * 2)) \> subgroup/memory.limit_in_bytes
 
 	cd subgroup
 	check_mem_stat "hierarchical_memory_limit" $limit
@@ -64,8 +64,8 @@ test6()
 	ROD echo 0 \> memory.use_hierarchy
 
 	ROD mkdir subgroup
-	echo $PAGESIZES > memory.limit_in_bytes
-	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
+	EXPECT_PASS echo $PAGESIZES \> memory.limit_in_bytes
+	EXPECT_PASS echo $((PAGESIZES * 2)) \> subgroup/memory.limit_in_bytes
 
 	cd subgroup
 	check_mem_stat "hierarchical_memory_limit" $((PAGESIZES * 2))
@@ -82,10 +82,10 @@ test7()
 	ROD echo 1 \> memory.use_hierarchy
 
 	ROD mkdir subgroup
-	echo $PAGESIZES > memory.limit_in_bytes
-	echo $PAGESIZES > memory.memsw.limit_in_bytes
-	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
-	echo $((PAGESIZES * 2)) > subgroup/memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $PAGESIZES \> memory.limit_in_bytes
+	EXPECT_PASS echo $PAGESIZES \> memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $((PAGESIZES * 2)) \> subgroup/memory.limit_in_bytes
+	EXPECT_PASS echo $((PAGESIZES * 2)) \> subgroup/memory.memsw.limit_in_bytes
 
 	cd subgroup
 	check_mem_stat "hierarchical_memsw_limit" $PAGESIZES
@@ -103,10 +103,10 @@ test8()
 	ROD echo 0 \> memory.use_hierarchy
 
 	ROD mkdir subgroup
-	echo $PAGESIZES > memory.limit_in_bytes
-	echo $PAGESIZES > memory.memsw.limit_in_bytes
-	echo $((PAGESIZES * 2)) > subgroup/memory.limit_in_bytes
-	echo $((PAGESIZES * 2)) > subgroup/memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $PAGESIZES \> memory.limit_in_bytes
+	EXPECT_PASS echo $PAGESIZES \> memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $((PAGESIZES * 2)) \> subgroup/memory.limit_in_bytes
+	EXPECT_PASS echo $((PAGESIZES * 2)) \> subgroup/memory.memsw.limit_in_bytes
 
 	cd subgroup
 	check_mem_stat "hierarchical_memsw_limit" $((PAGESIZES * 2))
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh b/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
index c28c39cf4387..3fa016102151 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_subgroup_charge.sh
@@ -33,8 +33,8 @@ test_subgroup()
 	fi
 
 	ROD mkdir subgroup
-	echo $limit_parent > memory.limit_in_bytes
-	echo $limit_subgroup > subgroup/memory.limit_in_bytes
+	EXPECT_PASS echo $limit_parent \> memory.limit_in_bytes
+	EXPECT_PASS echo $limit_subgroup \> subgroup/memory.limit_in_bytes
 
 	start_memcg_process --mmap-anon -s $MEM_TO_ALLOC
 
diff --git a/testcases/kernel/controllers/memcg/functional/memcg_usage_in_bytes_test.sh b/testcases/kernel/controllers/memcg/functional/memcg_usage_in_bytes_test.sh
index 9140fd9d1fd7..6c1b365057f8 100755
--- a/testcases/kernel/controllers/memcg/functional/memcg_usage_in_bytes_test.sh
+++ b/testcases/kernel/controllers/memcg/functional/memcg_usage_in_bytes_test.sh
@@ -28,8 +28,8 @@ test2()
 	tst_res TINFO "Test memory.memsw.usage_in_bytes"
 	memcg_require_memsw
 
-	echo $MEM_LIMIT > memory.limit_in_bytes
-	echo $MEM_LIMIT > memory.memsw.limit_in_bytes
+	EXPECT_PASS echo $MEM_LIMIT \> memory.limit_in_bytes
+	EXPECT_PASS echo $MEM_LIMIT \> memory.memsw.limit_in_bytes
 	test_mem_stat "--mmap-anon" $MEM_TO_ALLOC $MEM_TO_ALLOC \
 		"memory.memsw.usage_in_bytes" $MEM_TO_ALLOC \
 		$MEM_EXPECTED_UPPER false
-- 
2.30.2

[LTP] [PATCH v2 1/4] controllers/memcg: account per-node kernel memory

[Richard Palethorpe]

Hello Krzysztof,

Thanks, that is much easier to understand!

Reviewed-by: Richard Palethorpe <rpalethorpe@suse.com>

-- 
Thank you,
Richard.

[LTP] [PATCH v2 2/4] controllers/memcg: fix memcg_stat_test on two node machines

[Richard Palethorpe]

Reviewed-by: Richard Palethorpe <rpalethorpe@suse.com>


-- 
Thank you,
Richard.

[LTP] [PATCH v2 3/4] controllers/memcg: fail early to avoid possible false-positives

[Richard Palethorpe]

Reviewed-by: Richard Palethorpe <rpalethorpe@suse.com>


-- 
Thank you,
Richard.

[LTP] [PATCH v2 4/4] controllers/memcg: check status of commands using interface

[Richard Palethorpe]

Reviewed-by: Richard Palethorpe <rpalethorpe@suse.com>

-- 
Thank you,
Richard.

[LTP] [PATCH v2 0/4] controllers/memcg: fixes for CPU nodes on newer kernels

[Cyril Hrubis]

Hi!
Patchset applied, thanks.

-- 
Cyril Hrubis
chrubis@suse.cz