Re: [PATCH] selftest: memcg: Skp memcg_sock test if address family not supported

From: Waiman Long

Date: Mon Mar 09 2026 - 20:05:13 EST

On 3/9/26 2:07 PM, Michal Koutný wrote:
On Mon, Mar 09, 2026 at 12:02:05PM -0400, Waiman Long <longman@xxxxxxxxxx> wrote:
On systems where IPv6 isn't enabled or not configured to support
SOCK_STREAM, the test_memcg_sock test always fails.
I think IPv6 is not substantial for the check...
I mentioned it because the current code is using AF_INET6 family.

The purpose of the test_memcg_sock test is to verify that
memory.stat.sock and memory.current values are close.
... so this should work with IPv4 too.
Probably, I will try that out.

If the socket() call fails, there is no way we can test that. I
believe it is better to just skip the test in this case instead of
reporting a test failure hinting that there may be something wrong
with the memcg code.
Yes, the skip on (any) socket creation is also (independently) good.

@@ -1460,6 +1466,9 @@ static int test_memcg_sock(const char *root)
free(memcg);
return ret;
+skip:
+ ret = KSFT_SKIP;
+ goto cleanup;
Maybe make this analogous with other cases where there is no specific skip-label but

if (err == EAFNOSUPPORT) {
ret = KSFT_SKIP;
goto cleanup;
}

Yes, that will work too. Will make the update in the next version.

Cheers,
Longman