linux-kernel - Re: [PATCH net-next] udp: Add tracepoint for udp

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Message-ID: <6800064ea440f_fc9d7294c4@willemb.c.googlers.com.notmuch>
Date: Wed, 16 Apr 2025 15:34:38 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Breno Leitao <leitao@...ian.org>, 
 Willem de Bruijn <willemdebruijn.kernel@...il.com>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 Masami Hiramatsu <mhiramat@...nel.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 David Ahern <dsahern@...nel.org>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>, 
 kuniyu@...zon.com
Cc: netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 linux-trace-kernel@...r.kernel.org, 
 yonghong.song@...ux.dev, 
 song@...nel.org, 
 kernel-team@...a.com, 
 Breno Leitao <leitao@...ian.org>
Subject: Re: [PATCH net-next] udp: Add tracepoint for udp_sendmsg()

Breno Leitao wrote:
> Add a lightweight tracepoint to monitor UDP send message operations,
> similar to the recently introduced tcp_sendmsg_locked() trace event in
> commit 0f08335ade712 ("trace: tcp: Add tracepoint for
> tcp_sendmsg_locked()")
> 
> This implementation uses DECLARE_TRACE instead of TRACE_EVENT to avoid
> creating extensive trace event infrastructure and exporting to tracefs,
> keeping it minimal and efficient.
> 
> Since this patch creates a rawtracepoint, it can be accessed using
> standard tracing tools like bpftrace:
> 
>     rawtracepoint:udp_sendmsg_tp {
>         ...
>     }

What does this enable beyond kfunc:udp_sendmsg?

The arguments are the same, unlike the TCP tracepoint.