diff options
| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-07-07 18:12:26 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2018-08-30 16:03:32 -0700 |
| commit | 8c1cf2da6f8af7f6b6e0e06d3a83115712cc04b8 (patch) | |
| tree | b0dd65f7937445adcddc6c78ba01e345f45bb2a8 /kernel/rcu/Kconfig | |
| parent | df8561a0d7e4f5cb72d0aa6be43e154b2027bba6 (diff) | |
rcu: Clean up flavor-related definitions and comments in Kconfig
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/Kconfig')
| -rw-r--r-- | kernel/rcu/Kconfig | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index a0b7f0103ca9..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. @@ -225,15 +225,15 @@ 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 "p" for RCU-preempt and "s" for RCU-sched. - 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. + 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. Say Y here if you want to help to debug reduced OS jitter. Say N here if you are unsure. |