* [tip: sched/urgent] sched/core: Disable CONFIG_SCHED_CORE by default
@ 2021-06-28 21:39 tip-bot2 for Ingo Molnar
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot2 for Ingo Molnar @ 2021-06-28 21:39 UTC (permalink / raw)
To: linux-tip-commits; +Cc: Linus Torvalds, Ingo Molnar, x86, linux-kernel
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.
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [tip: sched/urgent] sched/core: Disable CONFIG_SCHED_CORE by default
@ 2021-06-28 20:06 tip-bot2 for Ingo Molnar
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot2 for Ingo Molnar @ 2021-06-28 20:06 UTC (permalink / raw)
To: linux-tip-commits; +Cc: Linus Torvalds, Ingo Molnar, x86, linux-kernel
The following commit has been merged into the sched/urgent branch of tip:
Commit-ID: 0e81c7c17c3edd469b6a87333059714a618d882c
Gitweb: https://git.kernel.org/tip/0e81c7c17c3edd469b6a87333059714a618d882c
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 21:55:16 +02:00
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@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/Kconfig.preempt | 1 -
1 file changed, 1 deletion(-)
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index bd7c414..3654a92 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
^ permalink raw reply related [flat|nested] 2+ messages in thread
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