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rcu: Clean up flavor-related definitions and comments in Kconfig

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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-07 18:12:26 -07:00
parent df8561a0d7
commit 8c1cf2da6f
1 changed files with 10 additions and 10 deletions
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20
kernel/rcu/Kconfig
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@ -196,7 +196,7 @@ config RCU_BOOST
This option boosts the priority of preempted RCU readers that This option boosts the priority of preempted RCU readers that
block the current preemptible RCU grace period for too long. block the current preemptible RCU grace period for too long.
This option also prevents heavy loads from blocking RCU 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 Y here if you are working with real-time apps or heavy loads
Say N here if you are unsure. Say N here if you are unsure.
@ -225,15 +225,15 @@ config RCU_NOCB_CPU
callback invocation to energy-efficient CPUs in battery-powered callback invocation to energy-efficient CPUs in battery-powered
asymmetric multiprocessors. asymmetric multiprocessors.
This option offloads callback invocation from the set of This option offloads callback invocation from the set of CPUs
CPUs specified at boot time by the rcu_nocbs parameter. specified at boot time by the rcu_nocbs parameter. For each
For each such CPU, a kthread ("rcuox/N") will be created to such CPU, a kthread ("rcuox/N") will be created to invoke
invoke callbacks, where the "N" is the CPU being offloaded, callbacks, where the "N" is the CPU being offloaded, and where
and where the "p" for RCU-preempt and "s" for RCU-sched. the "p" for RCU-preempt (PREEMPT kernels) and "s" for RCU-sched
Nothing prevents this kthread from running on the specified (!PREEMPT kernels). Nothing prevents this kthread from running
CPUs, but (1) the kthreads may be preempted between each on the specified CPUs, but (1) the kthreads may be preempted
callback, and (2) affinity or cgroups can be used to force between each callback, and (2) affinity or cgroups can be used
the kthreads to run on whatever set of CPUs is desired. 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 Y here if you want to help to debug reduced OS jitter.
Say N here if you are unsure. Say N here if you are unsure.