netdev - Re: [PATCH v10 bpf-next/net 3/6] net-memcg: Introduce net.core.memcg

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Message-ID: <pmti7ebtl7zfom5ndqcvpdwjxlkrvmly2ol64llabcwfk7bdg2@mc3pigkg2ppq>
Date: Mon, 22 Sep 2025 17:54:07 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: Alexei Starovoitov <ast@...nel.org>, 
	Andrii Nakryiko <andrii@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Martin KaFai Lau <martin.lau@...ux.dev>, 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>, 
	"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 v10 bpf-next/net 3/6] net-memcg: Introduce
 net.core.memcg_exclusive sysctl.

On Sat, Sep 20, 2025 at 12:07:17AM +0000, Kuniyuki Iwashima wrote:
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 814966309b0e..348e599c3fbc 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -2519,6 +2519,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
>  #ifdef CONFIG_MEMCG
>  	/* sk->sk_memcg will be populated at accept() time */
>  	newsk->sk_memcg = NULL;
> +	mem_cgroup_sk_set_flags(newsk, mem_cgroup_sk_get_flags(sk));

Why do you need to set the flag here? Will doing in __inet_accept only
be too late i.e. protocol accounting would have happened?