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16 	  thousands of CPUs.  It also scales down nicely to
27 	  is also required.  It also scales down nicely to
42 	bool "Make expert-level adjustments to RCU configuration"
45 	  This option needs to be enabled if you wish to make
46 	  expert-level adjustments to RCU configuration.  By default,
50 	  obscure RCU options to be set up.
52 	  Say Y if you need to make expert-level adjustments to RCU.
123 	  these readers to appear in the idle loop as well as on the
137 	  the TINY and TREE variants of RCU.  The purpose is to allow
138 	  the tiny variants to disable RCU CPU stall warnings, while
153 	  of RCU, allowing RCU to work efficiently on machines with
155 	  root of NR_CPUS, which allows NR_CPUS to be insanely large.
158 	  itself, small RCU_FANOUT values allow you to test large-system
179 	  (hundreds or thousands of CPUs) will instead want to set this
180 	  value to the maximum value possible in order to reduce the
182 	  initialization.  These systems tend to run CPU-bound, and thus
183 	  are not helped by synchronized interrupts, and thus tend to
186 	  fanout to a large number will likely cause problematic
193 	  please understand that you may also need to set the skew_tick
194 	  kernel boot parameter to avoid contention on the rcu_node
213 	int "Milliseconds to delay boosting after RCU grace-period start"
218 	  This option specifies the time to wait after the beginning of
230 	  Use this option to further reduce the latencies of expedited
245 	  Use this option to reduce OS jitter for aggressive HPC or
246 	  real-time workloads.	It can also be used to offload RCU
247 	  callback invocation to energy-efficient CPUs in battery-powered
255 	  such CPU, a kthread ("rcuox/N") will be created to invoke
261 	  be used to force the kthreads to run on whatever set of CPUs is
272 	  Use this option to offload callback processing from all CPUs
274 	  parameter. This also avoids the need to use any boot parameters
275 	  to achieve the effect of offloading all CPUs on boot.
285 	  Use this option to invoke offloaded callbacks as SCHED_FIFO
286 	  to avoid starvation by heavy SCHED_OTHER background load.
288 	  cause the rcuo[ps] kthreads to monopolize the CPU for hundreds
290 	  it is your responsibility to ensure that latency-sensitive
293 	  Say Y here if you want to set RT priority for offloading kthreads.
301 	  Use this option to further reduce the number of IPIs sent
302 	  to CPUs executing in userspace or idle during tasks trace
321 	  Requires rcu_nocbs=all to be set.
323 	  Use rcutree.enable_rcu_lazy=0 to turn it off at boot time.
331 	  off. Boot time param rcutree.enable_rcu_lazy=1 can be used to switch
344 	  the system as booted, to: /sys/module/rcupdate/parameters/rcu_boot_end_delay.
345 	  Or even just writing a value of 0 to this sysfs node. The sysfs node can
346 	  also be used to extend the delay to be larger than the default, assuming
349 	  The actual delay for RCU's view of the system to be marked as booted can be
350 	  higher than this value if the kernel takes a long time to initialize but it