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

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Message-ID: <20250227-ingenious-therapeutic-dingo-e786cc@leitao>
Date: Thu, 27 Feb 2025 08:26:07 -0800
From: Breno Leitao <leitao@...ian.org>
To: David Ahern <dsahern@...nel.org>
Cc: Eric Dumazet <edumazet@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	kernel-team@...a.com, yonghong.song@...ux.dev
Subject: Re: [PATCH net-next] trace: tcp: Add tracepoint for tcp_sendmsg()

On Wed, Feb 26, 2025 at 11:31:49AM -0700, David Ahern wrote:
> On 2/26/25 11:27 AM, Eric Dumazet wrote:
> > In 2022, Menglong Dong added __fix_address
> > 
> > Then later , Yafang Shao  added noinline_for_tracing .
> > 
> > Would one of them be sufficient ?
> 
> tcp_sendmsg_locked should not be getting inlined; it is the
> sendmsg_locked handler and directly called by several subsystems.
> 
> ie., moving the tracepoint to tcp_sendmsg_locked should solve the inline
> problem. From there, the question is inside the loop or at entry to the
> function. Inside the loop has been very helpful for me.

Inside the loop would work for me as well.