linux-kernel - Re: [PATCH v5 net-next] net/tcp: trace all TCP/IP state transition with tcp_set

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Date:   Fri, 8 Dec 2017 23:50:44 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Song Liu <songliubraving@...com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        yoshfuji@...ux-ipv6.org, Steven Rostedt <rostedt@...dmis.org>,
        Brendan Gregg <bgregg@...flix.com>, netdev@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 net-next] net/tcp: trace all TCP/IP state transition
 with tcp_set_state tracepoint

2017-12-08 23:42 GMT+08:00 David Miller <davem@...emloft.net>:
> From: Yafang Shao <laoar.shao@...il.com>
> Date: Fri, 8 Dec 2017 11:40:23 +0800
>
>> It will looks like these,
>>
>>     if (sk->sk_protocol == IPPROTO_TCP)
>>         __tcp_set_state(newsk, TCP_SYN_RECV);
>>     else
>>         newsk->sk_state = TCP_SYN_RECV;
>>
>>
>>     if (sk->sk_protocol == IPPROTO_TCP)
>>           __tcp_set_state(sk, TCP_CLOSE);
>>     else
>>           sk->sk_state = TCP_CLOSE;
>>
>>     if (sk->sk_protocol == IPPROTO_TCP)
>>           tcp_state_store(sk,  state);
>>     else
>>           sk_state_store(sk, state);
>>
>>
>> Some redundant code.
>>
>> IMO, put these similar code into a wrapper is more nice.
>
> I think this discussion and how ugly this is getting shows that
> tracing the state transitions of a socket is perhaps not best as a TCP
> specific feature.

Do you mean that tcp_set_state tracepoint should be replaced with
sk_set_state tracepoint and move that tracepoint to
trace/events/sock.h ?

Thanks
Yafang