linux-kernel - Re: [PATCH] net: remove release/lock_sock in tcp_splice

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Message-ID: <dc46f9de-641e-4b38-8661-4efd4859f49b@redhat.com>
Date: Thu, 15 Aug 2024 13:22:54 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Jason Xing <kerneljasonxing@...il.com>
Cc: sunyiqi <sunyiqixm@...il.com>, edumazet@...gle.com, davem@...emloft.net,
 dsahern@...nel.org, kuba@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: remove release/lock_sock in tcp_splice_read



On 8/15/24 12:55, Jason Xing wrote:
> On Thu, Aug 15, 2024 at 6:40 PM Paolo Abeni <pabeni@...hat.com> wrote:
> [...]
>>> -             release_sock(sk);
>>> -             lock_sock(sk);
>>
>> This is needed to flush the sk backlog.
>>
>> Somewhat related, I think we could replace the pair with sk_flush_backlog().
>>
> 
> Do you think we could do this like the following commit:
> 
> commit d41a69f1d390fa3f2546498103cdcd78b30676ff
> Author: Eric Dumazet <edumazet@...gle.com>
> Date:   Fri Apr 29 14:16:53 2016 -0700
> 
>      tcp: make tcp_sendmsg() aware of socket backlog
> 
>      Large sendmsg()/write() hold socket lock for the duration of the call,
>      unless sk->sk_sndbuf limit is hit. This is bad because incoming packets
>      are parked into socket backlog for a long time. >
> ?

Yep. To be more accurate I was looking at commit 
93afcfd1db35882921b2521a637c78755c27b02c

In any case this should be unrelated from the supposed issue.

Cheers,

Paolo