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CONFIG_RCU_NOCB_CPU: Offload RCU callback processing from boot-selected CPUs (EXPERIMENTAL

General informations

The Linux kernel configuration item CONFIG_RCU_NOCB_CPU has multiple definitions:

Offload RCU callback processing from boot-selected CPUs (EXPERIMENTAL found in init/Kconfig

The configuration item CONFIG_RCU_NOCB_CPU:

Help text

Use this option to reduce OS jitter for aggressive HPC or real-time workloads. It can also be used to offload RCU callback invocation to energy-efficient CPUs in battery-powered asymmetric multiprocessors.

This option offloads callback invocation from the set of CPUs specified at boot time by the rcu_nocbs parameter. For each such CPU, a kthread ("rcuox/N") will be created to invoke callbacks, where the "N" is the CPU being offloaded, and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and "s" for RCU-sched. Nothing prevents this kthread from running on the specified CPUs, but (1) the kthreads may be preempted between each callback, and (2) affinity or cgroups can be used to force the kthreads to run on whatever set of CPUs is desired.

Say Y here if you want to help to debug reduced OS jitter. Say N here if you are unsure.

Offload RCU callback processing from boot-selected CPUs found in init/Kconfig

The configuration item CONFIG_RCU_NOCB_CPU:

Help text

Use this option to reduce OS jitter for aggressive HPC or real-time workloads. It can also be used to offload RCU callback invocation to energy-efficient CPUs in battery-powered asymmetric multiprocessors.

This option offloads callback invocation from the set of CPUs specified at boot time by the rcu_nocbs parameter. For each such CPU, a kthread ("rcuox/N") will be created to invoke callbacks, where the "N" is the CPU being offloaded, and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and "s" for RCU-sched. Nothing prevents this kthread from running on the specified CPUs, but (1) the kthreads may be preempted between each callback, and (2) affinity or cgroups can be used to force the kthreads to run on whatever set of CPUs is desired.

Say Y here if you want to help to debug reduced OS jitter. Say N here if you are unsure.

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