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Subject[tip: sched/urgent] sched/core: Disable CONFIG_SCHED_CORE by default
The following commit has been merged into the sched/urgent branch of tip:

Commit-ID: d2343cb8d154fe20c4499711bb3a9af2095b2b4b
Gitweb: https://git.kernel.org/tip/d2343cb8d154fe20c4499711bb3a9af2095b2b4b
Author: Ingo Molnar <mingo@kernel.org>
AuthorDate: Mon, 28 Jun 2021 21:55:16 +02:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Mon, 28 Jun 2021 22:43:05 +02:00

sched/core: Disable CONFIG_SCHED_CORE by default

This option at minimum adds extra code to the scheduler - even if
it's default unused - and most users wouldn't want it.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/Kconfig.preempt | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index bd7c414..5876e30 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
@@ -115,7 +114,8 @@ config SCHED_CORE
- mitigation of some (not all) SMT side channels;
- limiting SMT interference to improve determinism and/or performance.

- SCHED_CORE is default enabled when SCHED_SMT is enabled -- when
- unused there should be no impact on performance.
+ SCHED_CORE is default disabled. When it is enabled and unused,
+ which is the likely usage by Linux distributions, there should
+ be no measurable impact on performance.


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