Re: [PATCH net-next] trace: tcp: Add tracepoint for tcp_sendmsg()

Eric Dumazet
2025-02-24T19:04:10Z

On Mon, Feb 24, 2025 at 7:24 PM Breno Leitao <leitao@debian.org> wrote:
>
> Add a lightweight tracepoint to monitor TCP sendmsg operations, enabling
> the tracing of TCP messages being sent.
>
> Meta has been using BPF programs to monitor this function for years,
> indicating significant interest in observing this important
> functionality. Adding a proper tracepoint provides a stable API for all
> users who need visibility into TCP message transmission.
>
> The implementation uses DECLARE_TRACE instead of TRACE_EVENT to avoid
> creating unnecessary trace event infrastructure and tracefs exports,
> keeping the implementation minimal while stabilizing the API.
>
> Given that this patch creates a rawtracepoint, you could hook into it
> using regular tooling, like bpftrace, using regular rawtracepoint
> infrastructure, such as:
>
> rawtracepoint:tcp_sendmsg_tp {
> ....
> }

I would expect tcp_sendmsg() being stable enough ?

kprobe:tcp_sendmsg {
}