netdev - Re: [PATCH v3 bpf-next/net 5/5] selftest: bpf: Add test for SK_BPF_MEMCG_SOCK

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Message-ID: <ab07a893-d27d-447e-931a-6014f55132d2@linux.dev>
Date: Wed, 27 Aug 2025 17:13:57 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: Alexei Starovoitov <ast@...nel.org>, Andrii Nakryiko <andrii@...nel.org>,
 Daniel Borkmann <daniel@...earbox.net>,
 John Fastabend <john.fastabend@...il.com>,
 Stanislav Fomichev <sdf@...ichev.me>, Johannes Weiner <hannes@...xchg.org>,
 Michal Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>,
 Shakeel Butt <shakeel.butt@...ux.dev>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Neal Cardwell <ncardwell@...gle.com>, Willem de Bruijn <willemb@...gle.com>,
 Mina Almasry <almasrymina@...gle.com>, Kuniyuki Iwashima
 <kuni1840@...il.com>, bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 bpf-next/net 5/5] selftest: bpf: Add test for
 SK_BPF_MEMCG_SOCK_ISOLATED.

On 8/26/25 11:38 AM, Kuniyuki Iwashima wrote:
> The test does the following for IPv4/IPv6 x TCP/UDP sockets
> with/without BPF prog.
> 
>    1. Create socket pairs
>    2. Send a bunch of data that require more than 1000 pages
>    3. Read memory_allocated from the 3rd column in /proc/net/protocols
>    4. Check if unread data is charged to memory_allocated
> 
> If BPF prog is attached, memory_allocated should not be changed,
> but we allow a small error (up to 10 pages) in case the test is ran
> concurrently with other tests using TCP/UDP sockets.

hmm... there is a "./test_progs -j" that multiple tests can run in parallel. 
Will it be reliable enough or it needs the "serial_" prefix in the test 
function? Beside, the test took ~20s in my qemu. Is it feasible to shorten the test?