netdev - Re: [PATCH net-next] tcp: move sk_forced_mem

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Message-ID: <ebb3a731-a3ec-444e-8efe-aa13cb76adad@redhat.com>
Date: Mon, 26 Jan 2026 09:18:18 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>, Simon Horman <horms@...nel.org>,
 Kuniyuki Iwashima <kuniyu@...gle.com>, netdev@...r.kernel.org,
 eric.dumazet@...il.com, Neal Cardwell <ncardwell@...gle.com>
Subject: Re: [PATCH net-next] tcp: move sk_forced_mem_schedule() to tcp.c

Hi Eric,

On Fri, Jan 23, 2026 at 6:16 AM Eric Dumazet <edumazet@...gle.com> wrote:
> TCP fast path can (auto)inline this helper, instead
 of (auto)inling it from tcp_send_fin().
>
>> No change of overall code size, but tcp_sendmsg() is faster.
>
> $ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
> add/remove: 0/0 grow/shrink: 1/1 up/down: 141/-140 (1)
> Function                                     old     new   delta
> tcp_stream_alloc_skb                         216     357    +141
> tcp_send_fin                                 688     548    -140
> Total: Before=22236729, After=22236730, chg +0.00%
>
> BTW, we might change tcp_send_fin() to use tcp_stream_alloc_skb().
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

I've a question out of sheer curiosity: are you using some specific tool
to look for inline opportunity, or "just" careful code and/or objdump
analysis?

Thanks,

Paolo