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SubjectRe: [PATCH 4/4] selftests: memcg: Remove protection from top level memcg
On Fri, May 13, 2022 at 07:18:11PM +0200, Michal Koutny wrote:
> The reclaim is triggered by memory limit in a subtree, therefore the
> testcase does not need configured protection against external reclaim.
>
> Also, correct/deduplicate respective comments
>
> Signed-off-by: Michal Koutný <mkoutny@suse.com>
> ---
> tools/testing/selftests/cgroup/test_memcontrol.c | 12 ++++--------
> 1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c
> index 9ffacf024bbd..9d370aafd799 100644
> --- a/tools/testing/selftests/cgroup/test_memcontrol.c
> +++ b/tools/testing/selftests/cgroup/test_memcontrol.c
> @@ -247,7 +247,7 @@ static int cg_test_proc_killed(const char *cgroup)
>
> /*
> * First, this test creates the following hierarchy:
> - * A memory.min = 50M, memory.max = 200M
> + * A memory.min = 0, memory.max = 200M
> * A/B memory.min = 50M, memory.current = 50M
> * A/B/C memory.min = 75M, memory.current = 50M
> * A/B/D memory.min = 25M, memory.current = 50M
> @@ -257,7 +257,7 @@ static int cg_test_proc_killed(const char *cgroup)
> * Usages are pagecache, but the test keeps a running
> * process in every leaf cgroup.
> * Then it creates A/G and creates a significant
> - * memory pressure in it.
> + * memory pressure in A.
> *
> * A/B memory.current ~= 50M
> * A/B/C memory.current ~= 29M
> @@ -335,8 +335,6 @@ static int test_memcg_min(const char *root)
> (void *)(long)fd);
> }
>
> - if (cg_write(parent[0], "memory.min", "50M"))
> - goto cleanup;
> if (cg_write(parent[1], "memory.min", "50M"))
> goto cleanup;
> if (cg_write(children[0], "memory.min", "75M"))
> @@ -404,8 +402,8 @@ static int test_memcg_min(const char *root)
>
> /*
> * First, this test creates the following hierarchy:
> - * A memory.low = 50M, memory.max = 200M
> - * A/B memory.low = 50M, memory.current = 50M
> + * A memory.low = 0, memory.max = 200M
> + * A/B memory.low = 50M, memory.current = ...

Can you, please, just remove "memory.current = ...", it's not
because obvious what "..." means here.

Other than that: Acked-by: Roman Gushchin <roman.gushchin@linux.dev>

Thank you!

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