unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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sched/core: Disable CONFIG_SCHED_CORE by default

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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 config SCHED_CORE
bool "Core Scheduling for SMT" bool "Core Scheduling for SMT"
default y
depends on SCHED_SMT depends on SCHED_SMT
help help
This option permits Core Scheduling, a means of coordinated task 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; - mitigation of some (not all) SMT side channels;
- limiting SMT interference to improve determinism and/or performance. - limiting SMT interference to improve determinism and/or performance.
SCHED_CORE is default enabled when SCHED_SMT is enabled -- when SCHED_CORE is default disabled. When it is enabled and unused,
unused there should be no impact on performance. which is the likely usage by Linux distributions, there should
be no measurable impact on performance.