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

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Message-ID: <be346d2a-29b1-4cb9-b335-bd5193cf4cbe@nvidia.com>
Date: Mon, 5 Jan 2026 15:15:42 -0500
From: Joel Fernandes <joelagnelf@...dia.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: "Christophe Leroy (CS GROUP)" <chleroy@...nel.org>,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Andrew Morton <akpm@...ux-foundation.org>, Yury Norov
 <yury.norov@...il.com>, Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 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>, Vivi Rodrigo <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" <linux-kernel@...r.kernel.org>,
 "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
 "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
 "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
 "linux-trace-kernel@...r.kernel.org" <linux-trace-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 7/7] kernel.h: drop trace_printk.h

On 1/5/2026 3:04 PM, Steven Rostedt wrote:
> On Mon, 5 Jan 2026 14:33:35 -0500
> Joel Fernandes <joelagnelf@...dia.com> wrote:
> 
>>>>> I'm thinking that my proposed config option is the best solution now. For
>>>>> those that do not care about debugging the kernel, you enable the
>>>>> "HIDE_TRACE_PRINTK" config so that your builds will be "quicker". But for
>>>>> everyone else, it will not slow down their workflow when they need to debug
>>>>> code.  
>>>>
>>>> 100% agree. We do have people running custom configs for faster builds, so this
>>>> hide thing could be enabled there assuming those don't care about debug.
>>>>
>>>> In other words, "If it aint broke, don't fix it".  
>>>
>>> But if I understand correctly, it would save 2% build time. That means 12
>>> secondes on a 10 minutes build. Is it really worth it ?
>>>   
>> 99% of my kernel builds are usually 90 seconds. I throw a lot of cores at it and
>> with ccache. I care more about trace_printk not being available than saving 2%.
>> But YMMV. I am sure there are people who care a lot about build time, but for me
>> it has not (yet) been a problem.
> 
> I can see Linus enabling this. I don't think he uses trace_printk() to
> debug the kernel, so improving his build times may be useful.

Sounds good to me. Making it an option sounds okay to me. Thanks.