netdev - Re: [PATCH v1 net-next 04/13] net: Call trace_sock_exceed_buf_limit() for memcg failure with SK_MEM

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Message-ID: <CANn89i+p45mE7MTEmf+_fYA_fKXnzMRXiDXNDdkrHVimcYMFRA@mail.gmail.com>
Date: Tue, 22 Jul 2025 07:37:14 -0700
From: Eric Dumazet <edumazet@...gle.com>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Neal Cardwell <ncardwell@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	Willem de Bruijn <willemb@...gle.com>, Matthieu Baerts <matttbe@...nel.org>, 
	Mat Martineau <martineau@...nel.org>, Johannes Weiner <hannes@...xchg.org>, 
	Michal Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Shakeel Butt <shakeel.butt@...ux.dev>, Andrew Morton <akpm@...ux-foundation.org>, 
	Simon Horman <horms@...nel.org>, Geliang Tang <geliang@...nel.org>, 
	Muchun Song <muchun.song@...ux.dev>, Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org, 
	mptcp@...ts.linux.dev, cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v1 net-next 04/13] net: Call trace_sock_exceed_buf_limit()
 for memcg failure with SK_MEM_RECV.

On Mon, Jul 21, 2025 at 1:36 PM Kuniyuki Iwashima <kuniyu@...gle.com> wrote:
>
> Initially, trace_sock_exceed_buf_limit() was invoked when
> __sk_mem_raise_allocated() failed due to the memcg limit or the
> global limit.
>
> However, commit d6f19938eb031 ("net: expose sk wmem in
> sock_exceed_buf_limit tracepoint") somehow suppressed the event
> only when memcg failed to charge for SK_MEM_RECV, although the
> memcg failure for SK_MEM_SEND still triggers the event.
>
> Let's restore the event for SK_MEM_RECV.
>
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...gle.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>