netdev - Re: [PATCH bpf-next/net 0/6] bpf: Allow opt-out from sk->sk_prot->memory

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Message-ID: <49b4dd53-68bd-4773-8c5c-10048f970f4a@linux.dev>
Date: Thu, 9 Oct 2025 11:28:05 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org
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>, "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>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Kuniyuki Iwashima <kuni1840@...il.com>, bpf@...r.kernel.org,
 Shakeel Butt <shakeel.butt@...ux.dev>, Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH bpf-next/net 0/6] bpf: Allow opt-out from
 sk->sk_prot->memory_allocated.

On 10/6/25 5:07 PM, Kuniyuki Iwashima wrote:
> This series allows opting out of the global per-protocol memory
> accounting if socket is configured as such by sysctl or BPF prog.
> 
> This series is v11 of the series below [0], but I start as a new series
> because the changes now fall in net and bpf subsystems only.

netdev reviewers, please take a look and ack if it looks good.

Shakeel, you have reviewed the earlier revision, please take a look.

Johannes, please comment if there is concern on the changes.

> 
> I discussed with Roman Gushchin offlist, and he suggested not mixing
> two independent subsystems and it would be cleaner not to depend on
> memcg.
> 
> So, sk->sk_memcg and memcg code are no longer touched, and instead we
> use another hole near sk->sk_prot to store a flag for the net feature.