Re: [PATCH v8 0/2] memcg: Fix test_memcg_min/low test failures

On Thu, May 01, 2025 at 09:04:41PM -0400, Waiman Long wrote:

v8:

• Ignore the low event count of child 2 with memory_recursiveprot on in patch 1 as originally suggested by Michal.

v7:

• Skip the vmscan change as the mem_cgroup_usage() check for now as it is currently redundant.

v6:

• The memcg_test_low failure is indeed due to the memory_recursiveprot mount option which is enabled by default in systemd cgroup v2 setting. So adopt Michal's suggestion to adjust the low event checking according to whether memory_recursiveprot is enabled or not.

The test_memcontrol selftest consistently fails its test_memcg_low sub-test (with memory_recursiveprot enabled) and sporadically fails its test_memcg_min sub-test. This patchset fixes the test_memcg_min and test_memcg_low failures by adjusting the test_memcontrol selftest to fix these test failures.

Waiman Long (2): selftests: memcg: Allow low event with no memory.low and memory_recursiveprot on selftests: memcg: Increase error tolerance of child memory.current check in test_memcg_protection()

Acked-by: Tejun Heo tj@kernel.org

Probably best to go through -mm? If cgroup would be better, please let me know.

Thanks.