David Vernet cdc69458a5 cgroup: account for memory_recursiveprot in test_memcg_low() ... The test_memcg_low() testcase in test_memcontrol.c verifies the expected behavior of groups using the memory.low knob. Part of the testcase verifies that a group with memory.low that experiences reclaim due to memory pressure elsewhere in the system, observes memory.events.low events as a result of that reclaim. In commit 8a931f8013 ("mm: memcontrol: recursive memory.low protection"), the memory controller was updated to propagate memory.low and memory.min protection from a parent group to its children via a configurable memory_recursiveprot mount option. This unfortunately broke the memcg tests, which asserts that a sibling that experienced reclaim but had a memory.low value of 0, would not observe any memory.low events. This patch updates test_memcg_low() to account for the new behavior introduced by memory_recursiveprot. So as to make the test resilient to multiple configurations, the patch also adds a new proc_mount_contains() helper that checks for a string in /proc/mounts, and is used to toggle behavior based on whether the default memory_recursiveprot was present. Link: https://lkml.kernel.org/r/20220423155619.3669555-3-void@manifault.com Signed-off-by: David Vernet <void@manifault.com> Acked-by: Roman Gushchin <roman.gushchin@linux.dev> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Shakeel Butt <shakeelb@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2022-05-13 07:20:12 -07:00
..
.gitignore	tests/cgroup: test cgroup.kill	2021-05-10 10:41:11 -04:00
cgroup_util.c	cgroup: account for memory_recursiveprot in test_memcg_low()	2022-05-13 07:20:12 -07:00
cgroup_util.h	cgroup: account for memory_recursiveprot in test_memcg_low()	2022-05-13 07:20:12 -07:00
Makefile	selftests: cgroup: build error multiple outpt files	2021-12-10 16:46:01 -07:00
test_core.c	selftests: cgroup: Test open-time cgroup namespace usage for migration checks	2022-01-06 11:02:29 -10:00
test_freezer.c	tests/cgroup: move cg_wait_for(), cg_prepare_for_wait()	2021-05-10 10:41:11 -04:00
test_kill.c	tests/cgroup: test cgroup.kill	2021-05-10 10:41:11 -04:00
test_kmem.c	kselftests: cgroup: update kmem test for new vmstat implementation	2021-04-30 11:20:38 -07:00
test_memcontrol.c	cgroup: account for memory_recursiveprot in test_memcg_low()	2022-05-13 07:20:12 -07:00
test_stress.sh	selftests: cgroup: Run test_core under interfering stress	2019-10-07 07:11:54 -07:00
with_stress.sh	selftests: cgroup: Run test_core under interfering stress	2019-10-07 07:11:54 -07:00