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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>
This commit is contained in:
Ingo Molnar 2021-06-28 21:55:16 +02:00
parent adf3c31e18
commit d2343cb8d1
1 changed files with 3 additions and 3 deletions
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6
kernel/Kconfig.preempt
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@ -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.