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Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index ec62139207d..5ac6ee09422 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -654,6 +654,28 @@ config RCU_BOOST_DELAY Accept the default if unsure. +config RCU_NOCB_CPU + bool "Offload RCU callback processing from boot-selected CPUs" + depends on TREE_RCU || TREE_PREEMPT_RCU + default n + help + 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 ("rcuoN") will be created to + invoke callbacks, where the "N" is the CPU being offloaded. + 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 reduced OS jitter on selected CPUs. + Say N here if you are unsure. + endmenu # "RCU Subsystem" config IKCONFIG |