linux-kernel - Re: [PATCH net] netconsole: Only register console drivers when targets are configured

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Message-ID: <aD1bCTmWWrOZs+Lu@gmail.com>
Date: Mon, 2 Jun 2025 01:04:25 -0700
From: Breno Leitao <leitao@...ian.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, horms@...nel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [PATCH net] netconsole: Only register console drivers when
 targets are configured

Hello Jakub,

On Fri, May 30, 2025 at 07:30:52PM -0700, Jakub Kicinski wrote:
> On Wed, 28 May 2025 10:20:19 -0700 Breno Leitao wrote:
> > The netconsole driver currently registers the basic console driver
> > unconditionally during initialization, even when only extended targets
> > are configured. This results in unnecessary console registration and
> > performance overhead, as the write_msg() callback is invoked for every
> > log message only to return early when no matching targets are found.
> > 
> > Optimize the driver by conditionally registering console drivers based
> > on the actual target configuration. The basic console driver is now
> > registered only when non-extended targets exist, same as the extended
> > console. The implementation also handles dynamic target creation through
> > the configfs interface.
> > 
> > This change eliminates unnecessary console driver registrations,
> > redundant write_msg() callbacks for unused console types, and associated
> > lock contention and target list iterations. The optimization is
> > particularly beneficial for systems using only the most common extended
> > console type.
> > 
> > Fixes: e2f15f9a79201 ("netconsole: implement extended console support")
> 
> Code makes sense but I think it's net-next material.

Sure, let me resend it (with the other patches) to net-next.

Thanks for the review,
--breno