Diffstat (limited to 'init/Kconfig')
1 files changed, 22 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index ec62139207d..5ac6ee09422 100644
@@ -654,6 +654,28 @@ config RCU_BOOST_DELAY
Accept the default if unsure.
+ bool "Offload RCU callback processing from boot-selected CPUs"
+ depends on TREE_RCU || TREE_PREEMPT_RCU
+ default n
+ 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"