diff options
Diffstat (limited to 'kernel/rcu/Kconfig')
| -rw-r--r-- | kernel/rcu/Kconfig | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index 9210379c0353..939a2056c87a 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -196,7 +196,7 @@ config RCU_BOOST This option boosts the priority of preempted RCU readers that block the current preemptible RCU grace period for too long. This option also prevents heavy loads from blocking RCU - callback invocation for all flavors of RCU. + callback invocation. Say Y here if you are working with real-time apps or heavy loads Say N here if you are unsure. @@ -225,12 +225,12 @@ config RCU_NOCB_CPU 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 + 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 "p" for RCU-preempt (PREEMPT kernels) and "s" for RCU-sched + (!PREEMPT kernels). 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. |