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@xxxxxxxxxx> AuthorDate: Mon, 28 Jun 2021 21:55:16 +02:00 Committer: Ingo Molnar <mingo@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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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