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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:

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:

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:

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:

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:

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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Navigation: Linux Kernel Driver DataBase - web LKDDB: main index - P index

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