linux-kernel - [PATCH] sched/core: Disable CONFIG_SCHED

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Message-ID: <YNopqw/BbJGjOGMq@gmail.com>
Date:   Mon, 28 Jun 2021 21:57:31 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] sched/core: Disable CONFIG_SCHED_CORE by default


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sun, Jun 27, 2021 at 11:51 PM Ingo Molnar <mingo@...nel.org> wrote:
> >
> >     - Add "Core Scheduling" via CONFIG_SCHED_CORE=y,
> 
> Grr.
> 
> Why is this feature "default y"? I see no reason why anybody would
> enable it outside of cloud providers, which doesn't argue for it being
> on by default.

You are completely right, I missed this. Find below the patch to fix it - 
feel free to apply it directly, will rebase sched/urgent accordingly.

Thanks,

	Ingo

=====================>
From: Ingo Molnar <mingo@...nel.org>
Date: Mon, 28 Jun 2021 21:55:16 +0200
Subject: [PATCH] sched/core: Disable CONFIG_SCHED_CORE by default

This option adds extra overhead to the scheduler, and most users wouldn't want it.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/Kconfig.preempt | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index bd7c4147b9a8..3654a92e7e70 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -102,7 +102,6 @@ config PREEMPT_DYNAMIC
 
 config SCHED_CORE
 	bool "Core Scheduling for SMT"
-	default y
 	depends on SCHED_SMT
 	help
 	  This option permits Core Scheduling, a means of coordinated task