linux-kernel - Re: [PATCH v4 7/7] kernel.h: drop trace

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Message-ID: <20251229171929.GAaVK4IX5Wxq3rRf0Z@fat_crate.local>
Date: Mon, 29 Dec 2025 18:19:29 +0100
From: Borislav Petkov <bp@...en8.de>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	"Yury Norov (NVIDIA)" <yury.norov@...il.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Christophe Leroy <chleroy@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
	David Laight <david.laight@...box.com>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	Daniel Gomez <da.gomez@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, linux-kernel@...r.kernel.org,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-modules@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH v4 7/7] kernel.h: drop trace_printk.h

On Mon, Dec 29, 2025 at 11:17:48AM -0500, Steven Rostedt wrote:
> But sure, if you want to save the few minutes that is added to "make
> allyesconfig"

Nah, it is

"Removing trace_printk.h saves 1.5-2% of compilation time on my
Ubuntu-derived x86_64/localyesconfig"

which is:

  localyesconfig  - Update current config converting local mods to core

and which makes me wonder - who does that?

What are we actually optimizing here?

And 1-2% at that.

I don't see how this outweighs the goodness of using trace_printk()
everywhere.

So that's a NO on that patch from me too.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette