[v7,0/2] memcg: Fix test_memcg_min/low test failures

Message

Waiman Long April 15, 2025, 9:04 p.m. UTC

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.

v5:
 - Use mem_cgroup_usage() in patch 1 as originally suggested by Johannes.

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()

 .../selftests/cgroup/test_memcontrol.c        | 20 ++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)