This is a note to let you know that I've just added the patch titled selftests: cgroup: fix unexpected failure on test_memcg_low to the 6.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: selftests-cgroup-fix-unexpected-failure-on-test_memc.patch and it can be found in the queue-6.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit f0e5c36e8af3183b84a69bb024b4a21bae675ba7 Author: Haifeng Xu <haifeng.xu@xxxxxxxxxx> Date: Mon May 22 09:52:33 2023 +0000 selftests: cgroup: fix unexpected failure on test_memcg_low [ Upstream commit 19ab365762c6cc39dfdee9e13ab0d12fe4b5540d ] Since commit f079a020ba95 ("selftests: memcg: factor out common parts of memory.{low,min} tests"), the value used in second alloc_anon has changed from 148M to 170M. Because memory.low allows reclaiming page cache in child cgroups, so the memory.current is close to 30M instead of 50M. Therefore, adjust the expected value of parent cgroup. Link: https://lkml.kernel.org/r/20230522095233.4246-2-haifeng.xu@xxxxxxxxxx Fixes: f079a020ba95 ("selftests: memcg: factor out common parts of memory.{low,min} tests") Signed-off-by: Haifeng Xu <haifeng.xu@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx> Cc: Shakeel Butt <shakeelb@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c index f4f7c0aef702b..a2a90f4bfe9fe 100644 --- a/tools/testing/selftests/cgroup/test_memcontrol.c +++ b/tools/testing/selftests/cgroup/test_memcontrol.c @@ -292,6 +292,7 @@ static int test_memcg_protection(const char *root, bool min) char *children[4] = {NULL}; const char *attribute = min ? "memory.min" : "memory.low"; long c[4]; + long current; int i, attempts; int fd; @@ -400,7 +401,8 @@ static int test_memcg_protection(const char *root, bool min) goto cleanup; } - if (!values_close(cg_read_long(parent[1], "memory.current"), MB(50), 3)) + current = min ? MB(50) : MB(30); + if (!values_close(cg_read_long(parent[1], "memory.current"), current, 3)) goto cleanup; if (!reclaim_until(children[0], MB(10)))