CONFIG_PREEMPT_RCU:

General informations

The Linux kernel configuration item CONFIG_PREEMPT_RCU has multiple definitions:

found in kernel/rcu/Kconfig

The configuration item CONFIG_PREEMPT_RCU:

• prompt:
• type: bool
• depends on: CONFIG_PREEMPTION
• defined in kernel/rcu/Kconfig
• found in Linux kernels: 4.13–4.20, 5.0–5.19, 6.0–6.12

Help text

This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response is also required. It also scales down nicely to smaller systems.

Select this option if you are unsure.

found in init/Kconfig

The configuration item CONFIG_PREEMPT_RCU:

• prompt:
• type: bool
• depends on: CONFIG_PREEMPT
• defined in init/Kconfig
• found in Linux kernels: 2.6.37–2.6.39, 3.0–3.18, 4.2–4.12

Help text

This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response is also required. It also scales down nicely to smaller systems.

Select this option if you are unsure.

Preemptible tree-based hierarchical RCU found in init/Kconfig

The configuration item CONFIG_PREEMPT_RCU:

• prompt: Preemptible tree-based hierarchical RCU
• type: bool
• depends on: CONFIG_PREEMPT
• defined in init/Kconfig
• found in Linux kernels: 3.19, 4.0–4.1

Help text

This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response is also required. It also scales down nicely to smaller systems.

Select this option if you are unsure.

Preemptible RCU found in init/Kconfig

The configuration item CONFIG_PREEMPT_RCU:

• prompt: Preemptible RCU
• type: bool
• depends on: CONFIG_PREEMPT
• defined in init/Kconfig
• found in Linux kernels: 2.6.29–2.6.31

Help text

This option reduces the latency of the kernel by making certain RCU sections preemptible. Normally RCU code is non-preemptible, if this option is selected then read-only RCU sections become preemptible. This helps latency, but may expose bugs due to now-naive assumptions about each RCU read-side critical section remaining on a given CPU through its execution.

Preemptible RCU found in kernel/Kconfig.preempt

The configuration item CONFIG_PREEMPT_RCU:

• prompt: Preemptible RCU
• type: bool
• depends on: CONFIG_PREEMPT
• defined in kernel/Kconfig.preempt
• found in Linux kernels: 2.6.25–2.6.28

Help text

This option reduces the latency of the kernel by making certain RCU sections preemptible. Normally RCU code is non-preemptible, if this option is selected then read-only RCU sections become preemptible. This helps latency, but may expose bugs due to now-naive assumptions about each RCU read-side critical section remaining on a given CPU through its execution.

Say N if you are unsure.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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