linux-kernel - Re: [PATCH v2 net-next] net: no longer support SOCK_REFCNT

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Date:   Wed, 15 Feb 2023 10:40:05 +0100
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Jason Xing <kerneljasonxing@...il.com>, kuniyu@...zon.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, dsahern@...nel.org,
        willemdebruijn.kernel@...il.com, nhorman@...driver.com,
        marcelo.leitner@...il.com, lucien.xin@...il.com,
        kgraul@...ux.ibm.com, wenjia@...ux.ibm.com, jaka@...ux.ibm.com,
        bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, jonathan.lemon@...il.com
Cc:     bpf@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-sctp@...r.kernel.org, mptcp@...ts.linux.dev,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH v2 net-next] net: no longer support SOCK_REFCNT_DEBUG
 feature

Hi Jason,

On 14/02/2023 05:14, Jason Xing wrote:
> From: Jason Xing <kernelxing@...cent.com>
> 
> Commit e48c414ee61f ("[INET]: Generalise the TCP sock ID lookup routines")
> commented out the definition of SOCK_REFCNT_DEBUG in 2005 and later another
> commit 463c84b97f24 ("[NET]: Introduce inet_connection_sock") removed it.
> Since we could track all of them through bpf and kprobe related tools
> and the feature could print loads of information which might not be
> that helpful even under a little bit pressure, the whole feature which
> has been inactive for many years is no longer supported.
> 
> Link: https://lore.kernel.org/lkml/20230211065153.54116-1-kerneljasonxing@gmail.com/
> Suggested-by: Kuniyuki Iwashima <kuniyu@...zon.com>
> Signed-off-by: Jason Xing <kernelxing@...cent.com>
(...)

> diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
> index 8cd6cc67c2c5..e913752df112 100644
> --- a/net/mptcp/protocol.c
> +++ b/net/mptcp/protocol.c
> @@ -2876,7 +2876,6 @@ static void __mptcp_destroy_sock(struct sock *sk)
>  	sk_stream_kill_queues(sk);
>  	xfrm_sk_free_policy(sk);
>  
> -	sk_refcnt_debug_release(sk);
>  	sock_put(sk);
>  }
>  

Thank you for the patch!

For the modification in MPTCP subtree:

Acked-by: Matthieu Baerts <matthieu.baerts@...sares.net>

Cheers,
Matt
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