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[108.212.132.20]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-4177e5e8185sm11914165fac.12.2026.03.14.13.14.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 14 Mar 2026 13:14:56 -0700 (PDT) From: atwellwea@gmail.com To: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, ncardwell@google.com Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mptcp@lists.linux.dev, dsahern@kernel.org, horms@kernel.org, kuniyu@google.com, andrew+netdev@lunn.ch, willemdebruijn.kernel@gmail.com, jasowang@redhat.com, skhan@linuxfoundation.org, corbet@lwn.net, matttbe@kernel.org, martineau@kernel.org, geliang@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, 0x7f454c46@gmail.com Subject: [PATCH net-next v2 10/14] tcp: expose rmem and backlog in tcp and mptcp rcvbuf_grow tracepoints Date: Sat, 14 Mar 2026 14:13:44 -0600 Message-ID: <20260314201348.1786972-11-atwellwea@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260314201348.1786972-1-atwellwea@gmail.com> References: <20260314201348.1786972-1-atwellwea@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Wesley Atwell Extend the tcp_rcvbuf_grow and mptcp_rcvbuf_grow tracepoints with the live receive-memory allocation and backlog occupancy that now drive the window-growth decisions in this series. That makes it easier to inspect sender-visible rwnd state against the actual hard receive-memory inputs. Signed-off-by: Wesley Atwell --- include/trace/events/mptcp.h | 11 +++++++---- include/trace/events/tcp.h | 12 +++++++----- 2 files changed, 14 insertions(+), 9 deletions(-) diff --git a/include/trace/events/mptcp.h b/include/trace/events/mptcp.h index 269d949b2025..167970e8e0a5 100644 --- a/include/trace/events/mptcp.h +++ b/include/trace/events/mptcp.h @@ -199,6 +199,8 @@ TRACE_EVENT(mptcp_rcvbuf_grow, __field(__u32, inq) __field(__u32, space) __field(__u32, ooo_space) + __field(__u32, rmem_alloc) + __field(__u32, backlog_len) __field(__u32, rcvbuf) __field(__u32, rcv_wnd) __field(__u8, scaling_ratio) @@ -228,6 +230,8 @@ TRACE_EVENT(mptcp_rcvbuf_grow, MPTCP_SKB_CB(msk->ooo_last_skb)->end_seq - msk->ack_seq; =20 + __entry->rmem_alloc =3D tcp_rmem_used(sk); + __entry->backlog_len =3D READ_ONCE(msk->backlog_len); __entry->rcvbuf =3D sk->sk_rcvbuf; __entry->rcv_wnd =3D atomic64_read(&msk->rcv_wnd_sent) - msk->ack_seq; @@ -248,12 +252,11 @@ TRACE_EVENT(mptcp_rcvbuf_grow, __entry->skaddr =3D sk; ), =20 - TP_printk("time=3D%u rtt_us=3D%u copied=3D%u inq=3D%u space=3D%u ooo=3D%u= scaling_ratio=3D%u " - "rcvbuf=3D%u rcv_wnd=3D%u family=3D%d sport=3D%hu dport=3D%hu saddr=3D= %pI4 " - "daddr=3D%pI4 saddrv6=3D%pI6c daddrv6=3D%pI6c skaddr=3D%p", + TP_printk("time=3D%u rtt_us=3D%u copied=3D%u inq=3D%u space=3D%u ooo=3D%u= scaling_ratio=3D%u rmem_alloc=3D%u backlog_len=3D%u rcvbuf=3D%u rcv_wnd=3D= %u family=3D%d sport=3D%hu dport=3D%hu saddr=3D%pI4 daddr=3D%pI4 saddrv6=3D= %pI6c daddrv6=3D%pI6c skaddr=3D%p", __entry->time, __entry->rtt_us, __entry->copied, __entry->inq, __entry->space, __entry->ooo_space, - __entry->scaling_ratio, __entry->rcvbuf, __entry->rcv_wnd, + __entry->scaling_ratio, __entry->rmem_alloc, + __entry->backlog_len, __entry->rcvbuf, __entry->rcv_wnd, __entry->family, __entry->sport, __entry->dport, __entry->saddr, __entry->daddr, __entry->saddr_v6, __entry->daddr_v6, __entry->skaddr) diff --git a/include/trace/events/tcp.h b/include/trace/events/tcp.h index f155f95cdb6e..92d0bd6be0ba 100644 --- a/include/trace/events/tcp.h +++ b/include/trace/events/tcp.h @@ -217,6 +217,8 @@ TRACE_EVENT(tcp_rcvbuf_grow, __field(__u32, inq) __field(__u32, space) __field(__u32, ooo_space) + __field(__u32, rmem_alloc) + __field(__u32, backlog_len) __field(__u32, rcvbuf) __field(__u32, rcv_ssthresh) __field(__u32, window_clamp) @@ -247,6 +249,8 @@ TRACE_EVENT(tcp_rcvbuf_grow, TCP_SKB_CB(tp->ooo_last_skb)->end_seq - tp->rcv_nxt; =20 + __entry->rmem_alloc =3D tcp_rmem_used(sk); + __entry->backlog_len =3D READ_ONCE(sk->sk_backlog.len); __entry->rcvbuf =3D sk->sk_rcvbuf; __entry->rcv_ssthresh =3D tp->rcv_ssthresh; __entry->window_clamp =3D tp->window_clamp; @@ -269,13 +273,11 @@ TRACE_EVENT(tcp_rcvbuf_grow, __entry->sock_cookie =3D sock_gen_cookie(sk); ), =20 - TP_printk("time=3D%u rtt_us=3D%u copied=3D%u inq=3D%u space=3D%u ooo=3D%u= scaling_ratio=3D%u rcvbuf=3D%u " - "rcv_ssthresh=3D%u window_clamp=3D%u rcv_wnd=3D%u " - "family=3D%s sport=3D%hu dport=3D%hu saddr=3D%pI4 daddr=3D%pI4 " - "saddrv6=3D%pI6c daddrv6=3D%pI6c skaddr=3D%p sock_cookie=3D%llx", + TP_printk("time=3D%u rtt_us=3D%u copied=3D%u inq=3D%u space=3D%u ooo=3D%u= scaling_ratio=3D%u rmem_alloc=3D%u backlog_len=3D%u rcvbuf=3D%u rcv_ssthre= sh=3D%u window_clamp=3D%u rcv_wnd=3D%u family=3D%s sport=3D%hu dport=3D%hu = saddr=3D%pI4 daddr=3D%pI4 saddrv6=3D%pI6c daddrv6=3D%pI6c skaddr=3D%p sock_= cookie=3D%llx", __entry->time, __entry->rtt_us, __entry->copied, __entry->inq, __entry->space, __entry->ooo_space, - __entry->scaling_ratio, __entry->rcvbuf, + __entry->scaling_ratio, __entry->rmem_alloc, + __entry->backlog_len, __entry->rcvbuf, __entry->rcv_ssthresh, __entry->window_clamp, __entry->rcv_wnd, show_family_name(__entry->family), --=20 2.43.0