1 files changed, 22 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index ec62139207d3..5ac6ee094225 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