Re: [PATCH] net: remove release/lock_sock in tcp_splice_read

[Paolo Abeni <pabeni@redhat.com>]

On 8/15/24 12:55, Jason Xing wrote:
> On Thu, Aug 15, 2024 at 6:40 PM Paolo Abeni <pabeni@redhat.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@google.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