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The Linux kernel configuration item CONFIG_PREEMPT_RCU
has multiple definitions:
kernel/rcu/Kconfig
The configuration item CONFIG_PREEMPT_RCU:
CONFIG_PREEMPTION
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.
init/Kconfig
The configuration item CONFIG_PREEMPT_RCU:
CONFIG_PREEMPT
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.
init/Kconfig
The configuration item CONFIG_PREEMPT_RCU:
CONFIG_PREEMPT
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.
init/Kconfig
The configuration item CONFIG_PREEMPT_RCU:
CONFIG_PREEMPT
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.
kernel/Kconfig.preempt
The configuration item CONFIG_PREEMPT_RCU:
CONFIG_PREEMPT
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.
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