Subject: Re: [PATCH v2 net-next 7/7] tcp: make tcp_sendmsg() aware of socket backlog

From: Alexei Starovoitov <[email-masked]>
Date: Thu, 28 Apr 2016 22:19:22 -0700

On 4/28/16 10:05 PM, Eric Dumazet wrote:
> On Thu, 2016-04-28 at 21:43 -0700, Alexei Starovoitov wrote:
>
>>
>> I don't understand the logic completely, but isn't it
>> safer to do 'goto wait_for_memory;' here if we happened
>> to hit this in the middle of the loop?
>
> Well, the wait_for_memory pushes data, and could early return to user
> space with short writes (non blocking IO). This would break things...

I see. Right. My only concern was about restarting the loop
and msg_data_left(), since it's really hard to follow iov_iter logic.