Lines Matching +full:real +full:- +full:time

1 # SPDX-License-Identifier: GPL-2.0-only
3 # RCU-related configuration options
24 	  thousands of CPUs, but for which real-time response
35 	  designed for UP systems from which real-time response
40 	bool "Make expert-level adjustments to RCU configuration"
44 	  expert-level adjustments to RCU configuration.  By default,
45 	  no such adjustments can be made, which has the often-beneficial
46 	  side-effect of preventing "make oldconfig" from asking you all
50 	  Say Y if you need to make expert-level adjustments to RCU.
58 	  permits arbitrary sleeping or blocking within RCU read-side critical
65 	  This option selects the single-CPU non-preemptible version of SRCU.
71 	  This option selects the full-fledged version of SRCU.
78 	  task-based RCU implementations.  Not for manual selection.
83 	  This option enables a task-based RCU implementation that uses
85 	  user-mode execution as quiescent states.  Not for manual selection.
90 	  This option enables a task-based RCU implementation that uses
91 	  only context switch (including preemption) and user-mode
99 	  This option enables a task-based RCU implementation that uses
100 	  explicit rcu_read_lock_trace() read-side markers, and allows
117 	int "Tree-based hierarchical RCU fanout value"
129 	  systems, but if you are stress-testing the RCU implementation
130 	  itself, small RCU_FANOUT values allow you to test large-system
137 	int "Tree-based hierarchical RCU leaf-level fanout value"
145 	  This option controls the leaf-level fanout of hierarchical
148 	  scheduling-clock interrupts for energy-efficiency reasons will
149 	  want the default because the smaller leaf-level fanout keeps
153 	  number of cache misses incurred during RCU's grace-period
154 	  initialization.  These systems tend to run CPU-bound, and thus
157 	  leaf-level fanouts work well.  That said, setting leaf-level
159 	  lock contention on the leaf-level rcu_node structures unless
172 	bool "Accelerate last non-dyntick-idle CPU's grace periods"
176 	  This option permits CPUs to enter dynticks-idle state even if
185 	  	don't care about increased grace-period durations.
199 	  Say Y here if you are working with real-time apps or heavy loads
203 	int "Milliseconds to delay boosting after RCU grace-period start"
208 	  This option specifies the time to wait after the beginning of
209 	  a given grace period before priority-boosting preempted RCU
216 	bool "Offload RCU callback processing from boot-selected CPUs"
222 	  real-time workloads.	It can also be used to offload RCU
223 	  callback invocation to energy-efficient CPUs in battery-powered
227 	  specified at boot time by the rcu_nocbs parameter.  For each
230 	  the "p" for RCU-preempt (PREEMPTION kernels) and "s" for RCU-sched
250 	  real-time installations and for battery-powered devices,
254 	  Say N here if you hate read-side memory barriers.