[rds-devel] [External] : Re: [PATCH v3 net-next 0/9] tcp: avoid struct socket cache line miss in tcp_check_space()

[patchwork-bot+netdevbpf at kernel.org]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba at kernel.org>:

On Tue, 29 Sep 2026 07:17:34 +0000 you wrote:
> tcp_check_space() is called on every incoming ACK and every transmitted
> packet, and tests SOCK_NOSPACE in sk->sk_socket->flags.  Because struct
> socket lives in its own cache line and the TCP fast paths do not touch
> it for anything else, that test pulls in an extra cache line that is
> cold when the working set of active sockets is large.
> 
> This series mirrors SOCK_NOSPACE into a new u8 field, tp->tcp_nospace,
> placed right after tp->chrono_type in the tcp_sock_write_tx cache line
> group (fitting in an existing 3-byte hole before chrono_start, so no
> other field moves and sizeof(struct tcp_sock) is unchanged).  Both the
> transmit and ACK fast paths already touch that cache line, making the
> fast-path test in tcp_check_space() free of extra cache misses while
> keeping __tcp_check_space() authoritative on SOCK_NOSPACE.
> 
> [...]

Here is the summary with links:
  - [v3,net-next,1/9] dlm: fix send buffer backpressure handling
    https://git.kernel.org/netdev/net-next/c/e234d7625598
  - [v3,net-next,2/9] net: add sk_set_nospace() and sk_clear_nospace()
    https://git.kernel.org/netdev/net-next/c/6ba48a271bdb
  - [v3,net-next,3/9] sunrpc: use sk_set_nospace() and sk_clear_nospace()
    https://git.kernel.org/netdev/net-next/c/28613c4d4757
  - [v3,net-next,4/9] rds: use sk_set_nospace()
    https://git.kernel.org/netdev/net-next/c/b747807ccaf9
  - [v3,net-next,5/9] dlm: use sk_set_nospace() and sk_clear_nospace()
    https://git.kernel.org/netdev/net-next/c/0e0be63cb35d
  - [v3,net-next,6/9] drbd: use sk_set_nospace()
    https://git.kernel.org/netdev/net-next/c/24280d1d2832
  - [v3,net-next,7/9] nvme-tcp: use sk_clear_nospace()
    https://git.kernel.org/netdev/net-next/c/f80fa2ddfe95
  - [v3,net-next,8/9] libceph: use sk_clear_nospace()
    https://git.kernel.org/netdev/net-next/c/5181ac617537
  - [v3,net-next,9/9] tcp: add tp->tcp_nospace
    https://git.kernel.org/netdev/net-next/c/4eee6d58ad14

You are awesome, thank you!
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