CONFIG_SCHED_CORE: Core Scheduling for SMT

General informations

The Linux kernel configuration item CONFIG_SCHED_CORE:

• prompt: Core Scheduling for SMT
• type: bool
• depends on: CONFIG_SCHED_SMT
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 5.14–5.19, 6.0–6.14, 6.15-rc+HEAD

Help text

This option permits Core Scheduling, a means of coordinated task selection across SMT siblings. When enabled -- see prctl(PR_SCHED_CORE) -- task selection ensures that all SMT siblings will execute a task from the same 'core group', forcing idle when no matching task is found.

Use of this feature includes: - mitigation of some (not all) SMT side channels; - limiting SMT interference to improve determinism and/or 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.

Hardware

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The data is retrived from:

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• Linux Kernel Driver DataBase (LKDDb)

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