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Linux/kernel/rcu/Kconfig

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Diff markup

Differences between /kernel/rcu/Kconfig (Version linux-6.11.5) and /kernel/rcu/Kconfig (Version linux-4.13.16)


  1 # SPDX-License-Identifier: GPL-2.0-only        << 
  2 #                                                   1 #
  3 # RCU-related configuration options                 2 # RCU-related configuration options
  4 #                                                   3 #
  5                                                     4 
  6 menu "RCU Subsystem"                                5 menu "RCU Subsystem"
  7                                                     6 
  8 config TREE_RCU                                     7 config TREE_RCU
  9         bool                                        8         bool
 10         default y if SMP                       !!   9         default y if !PREEMPT && SMP
 11         # Dynticks-idle tracking               << 
 12         select CONTEXT_TRACKING_IDLE           << 
 13         help                                       10         help
 14           This option selects the RCU implemen     11           This option selects the RCU implementation that is
 15           designed for very large SMP system w     12           designed for very large SMP system with hundreds or
 16           thousands of CPUs.  It also scales d     13           thousands of CPUs.  It also scales down nicely to
 17           smaller systems.                         14           smaller systems.
 18                                                    15 
 19 config PREEMPT_RCU                                 16 config PREEMPT_RCU
 20         bool                                       17         bool
 21         default y if PREEMPTION                !!  18         default y if PREEMPT
 22         select TREE_RCU                        << 
 23         help                                       19         help
 24           This option selects the RCU implemen     20           This option selects the RCU implementation that is
 25           designed for very large SMP systems      21           designed for very large SMP systems with hundreds or
 26           thousands of CPUs, but for which rea     22           thousands of CPUs, but for which real-time response
 27           is also required.  It also scales do     23           is also required.  It also scales down nicely to
 28           smaller systems.                         24           smaller systems.
 29                                                    25 
 30           Select this option if you are unsure     26           Select this option if you are unsure.
 31                                                    27 
 32 config TINY_RCU                                    28 config TINY_RCU
 33         bool                                       29         bool
 34         default y if !PREEMPT_RCU && !SMP      !!  30         default y if !PREEMPT && !SMP
 35         help                                       31         help
 36           This option selects the RCU implemen     32           This option selects the RCU implementation that is
 37           designed for UP systems from which r     33           designed for UP systems from which real-time response
 38           is not required.  This option greatl     34           is not required.  This option greatly reduces the
 39           memory footprint of RCU.                 35           memory footprint of RCU.
 40                                                    36 
 41 config RCU_EXPERT                                  37 config RCU_EXPERT
 42         bool "Make expert-level adjustments to     38         bool "Make expert-level adjustments to RCU configuration"
 43         default n                                  39         default n
 44         help                                       40         help
 45           This option needs to be enabled if y     41           This option needs to be enabled if you wish to make
 46           expert-level adjustments to RCU conf     42           expert-level adjustments to RCU configuration.  By default,
 47           no such adjustments can be made, whi     43           no such adjustments can be made, which has the often-beneficial
 48           side-effect of preventing "make oldc     44           side-effect of preventing "make oldconfig" from asking you all
 49           sorts of detailed questions about ho     45           sorts of detailed questions about how you would like numerous
 50           obscure RCU options to be set up.        46           obscure RCU options to be set up.
 51                                                    47 
 52           Say Y if you need to make expert-lev     48           Say Y if you need to make expert-level adjustments to RCU.
 53                                                    49 
 54           Say N if you are unsure.                 50           Say N if you are unsure.
 55                                                    51 
                                                   >>  52 config SRCU
                                                   >>  53         bool
                                                   >>  54         help
                                                   >>  55           This option selects the sleepable version of RCU. This version
                                                   >>  56           permits arbitrary sleeping or blocking within RCU read-side critical
                                                   >>  57           sections.
                                                   >>  58 
 56 config TINY_SRCU                                   59 config TINY_SRCU
 57         bool                                       60         bool
 58         default y if TINY_RCU                  !!  61         default y if SRCU && TINY_RCU
 59         help                                       62         help
 60           This option selects the single-CPU n     63           This option selects the single-CPU non-preemptible version of SRCU.
 61                                                    64 
 62 config TREE_SRCU                                   65 config TREE_SRCU
 63         bool                                       66         bool
 64         default y if !TINY_RCU                 !!  67         default y if SRCU && !TINY_RCU
 65         help                                       68         help
 66           This option selects the full-fledged     69           This option selects the full-fledged version of SRCU.
 67                                                    70 
 68 config NEED_SRCU_NMI_SAFE                      << 
 69         def_bool HAVE_NMI && !ARCH_HAS_NMI_SAF << 
 70                                                << 
 71 config TASKS_RCU_GENERIC                       << 
 72         def_bool TASKS_RCU || TASKS_RUDE_RCU | << 
 73         help                                   << 
 74           This option enables generic infrastr << 
 75           task-based RCU implementations.  Not << 
 76                                                << 
 77 config FORCE_TASKS_RCU                         << 
 78         bool "Force selection of TASKS_RCU"    << 
 79         depends on RCU_EXPERT                  << 
 80         select TASKS_RCU                       << 
 81         default n                              << 
 82         help                                   << 
 83           This option force-enables a task-bas << 
 84           that uses only voluntary context swi << 
 85           idle, and user-mode execution as qui << 
 86           manual selection in most cases.      << 
 87                                                << 
 88 config NEED_TASKS_RCU                          << 
 89         bool                                   << 
 90         default n                              << 
 91                                                << 
 92 config TASKS_RCU                                   71 config TASKS_RCU
 93         bool                                       72         bool
 94         default NEED_TASKS_RCU && (PREEMPTION  << 
 95         select IRQ_WORK                        << 
 96                                                << 
 97 config FORCE_TASKS_RUDE_RCU                    << 
 98         bool "Force selection of Tasks Rude RC << 
 99         depends on RCU_EXPERT                  << 
100         select TASKS_RUDE_RCU                  << 
101         default n                              << 
102         help                                   << 
103           This option force-enables a task-bas << 
104           that uses only context switch (inclu << 
105           user-mode execution as quiescent sta << 
106           context switches on all online CPUs, << 
107           so use with caution.  Not for manual << 
108                                                << 
109 config TASKS_RUDE_RCU                          << 
110         bool                                   << 
111         default n                              << 
112         select IRQ_WORK                        << 
113                                                << 
114 config FORCE_TASKS_TRACE_RCU                   << 
115         bool "Force selection of Tasks Trace R << 
116         depends on RCU_EXPERT                  << 
117         select TASKS_TRACE_RCU                 << 
118         default n                                  73         default n
                                                   >>  74         select SRCU
119         help                                       75         help
120           This option enables a task-based RCU     76           This option enables a task-based RCU implementation that uses
121           explicit rcu_read_lock_trace() read- !!  77           only voluntary context switch (not preemption!), idle, and
122           these readers to appear in the idle  !!  78           user-mode execution as quiescent states.
123           CPU hotplug code paths.  It can forc << 
124           including idle ones, so use with cau << 
125           selection in most cases.             << 
126                                                << 
127 config TASKS_TRACE_RCU                         << 
128         bool                                   << 
129         default n                              << 
130         select IRQ_WORK                        << 
131                                                    79 
132 config RCU_STALL_COMMON                            80 config RCU_STALL_COMMON
133         def_bool TREE_RCU                      !!  81         def_bool ( TREE_RCU || PREEMPT_RCU )
134         help                                       82         help
135           This option enables RCU CPU stall co     83           This option enables RCU CPU stall code that is common between
136           the TINY and TREE variants of RCU.       84           the TINY and TREE variants of RCU.  The purpose is to allow
137           the tiny variants to disable RCU CPU     85           the tiny variants to disable RCU CPU stall warnings, while
138           making these warnings mandatory for      86           making these warnings mandatory for the tree variants.
139                                                    87 
140 config RCU_NEED_SEGCBLIST                          88 config RCU_NEED_SEGCBLIST
141         def_bool ( TREE_RCU || TREE_SRCU || TA !!  89         def_bool ( TREE_RCU || PREEMPT_RCU || TREE_SRCU )
                                                   >>  90 
                                                   >>  91 config CONTEXT_TRACKING
                                                   >>  92        bool
                                                   >>  93 
                                                   >>  94 config CONTEXT_TRACKING_FORCE
                                                   >>  95         bool "Force context tracking"
                                                   >>  96         depends on CONTEXT_TRACKING
                                                   >>  97         default y if !NO_HZ_FULL
                                                   >>  98         help
                                                   >>  99           The major pre-requirement for full dynticks to work is to
                                                   >> 100           support the context tracking subsystem. But there are also
                                                   >> 101           other dependencies to provide in order to make the full
                                                   >> 102           dynticks working.
                                                   >> 103 
                                                   >> 104           This option stands for testing when an arch implements the
                                                   >> 105           context tracking backend but doesn't yet fullfill all the
                                                   >> 106           requirements to make the full dynticks feature working.
                                                   >> 107           Without the full dynticks, there is no way to test the support
                                                   >> 108           for context tracking and the subsystems that rely on it: RCU
                                                   >> 109           userspace extended quiescent state and tickless cputime
                                                   >> 110           accounting. This option copes with the absence of the full
                                                   >> 111           dynticks subsystem by forcing the context tracking on all
                                                   >> 112           CPUs in the system.
                                                   >> 113 
                                                   >> 114           Say Y only if you're working on the development of an
                                                   >> 115           architecture backend for the context tracking.
                                                   >> 116 
                                                   >> 117           Say N otherwise, this option brings an overhead that you
                                                   >> 118           don't want in production.
                                                   >> 119 
142                                                   120 
143 config RCU_FANOUT                                 121 config RCU_FANOUT
144         int "Tree-based hierarchical RCU fanou    122         int "Tree-based hierarchical RCU fanout value"
145         range 2 64 if 64BIT                       123         range 2 64 if 64BIT
146         range 2 32 if !64BIT                      124         range 2 32 if !64BIT
147         depends on TREE_RCU && RCU_EXPERT      !! 125         depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT
148         default 64 if 64BIT                       126         default 64 if 64BIT
149         default 32 if !64BIT                      127         default 32 if !64BIT
150         help                                      128         help
151           This option controls the fanout of h    129           This option controls the fanout of hierarchical implementations
152           of RCU, allowing RCU to work efficie    130           of RCU, allowing RCU to work efficiently on machines with
153           large numbers of CPUs.  This value m    131           large numbers of CPUs.  This value must be at least the fourth
154           root of NR_CPUS, which allows NR_CPU    132           root of NR_CPUS, which allows NR_CPUS to be insanely large.
155           The default value of RCU_FANOUT shou    133           The default value of RCU_FANOUT should be used for production
156           systems, but if you are stress-testi    134           systems, but if you are stress-testing the RCU implementation
157           itself, small RCU_FANOUT values allo    135           itself, small RCU_FANOUT values allow you to test large-system
158           code paths on small(er) systems.        136           code paths on small(er) systems.
159                                                   137 
160           Select a specific number if testing     138           Select a specific number if testing RCU itself.
161           Take the default if unsure.             139           Take the default if unsure.
162                                                   140 
163 config RCU_FANOUT_LEAF                            141 config RCU_FANOUT_LEAF
164         int "Tree-based hierarchical RCU leaf-    142         int "Tree-based hierarchical RCU leaf-level fanout value"
165         range 2 64 if 64BIT && !RCU_STRICT_GRA !! 143         range 2 64 if 64BIT
166         range 2 32 if !64BIT && !RCU_STRICT_GR !! 144         range 2 32 if !64BIT
167         range 2 3 if RCU_STRICT_GRACE_PERIOD   !! 145         depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT
168         depends on TREE_RCU && RCU_EXPERT      !! 146         default 16
169         default 16 if !RCU_STRICT_GRACE_PERIOD << 
170         default 2 if RCU_STRICT_GRACE_PERIOD   << 
171         help                                      147         help
172           This option controls the leaf-level     148           This option controls the leaf-level fanout of hierarchical
173           implementations of RCU, and allows t    149           implementations of RCU, and allows trading off cache misses
174           against lock contention.  Systems th    150           against lock contention.  Systems that synchronize their
175           scheduling-clock interrupts for ener    151           scheduling-clock interrupts for energy-efficiency reasons will
176           want the default because the smaller    152           want the default because the smaller leaf-level fanout keeps
177           lock contention levels acceptably lo    153           lock contention levels acceptably low.  Very large systems
178           (hundreds or thousands of CPUs) will    154           (hundreds or thousands of CPUs) will instead want to set this
179           value to the maximum value possible     155           value to the maximum value possible in order to reduce the
180           number of cache misses incurred duri    156           number of cache misses incurred during RCU's grace-period
181           initialization.  These systems tend     157           initialization.  These systems tend to run CPU-bound, and thus
182           are not helped by synchronized inter    158           are not helped by synchronized interrupts, and thus tend to
183           skew them, which reduces lock conten    159           skew them, which reduces lock contention enough that large
184           leaf-level fanouts work well.  That     160           leaf-level fanouts work well.  That said, setting leaf-level
185           fanout to a large number will likely    161           fanout to a large number will likely cause problematic
186           lock contention on the leaf-level rc    162           lock contention on the leaf-level rcu_node structures unless
187           you boot with the skew_tick kernel p    163           you boot with the skew_tick kernel parameter.
188                                                   164 
189           Select a specific number if testing     165           Select a specific number if testing RCU itself.
190                                                   166 
191           Select the maximum permissible value    167           Select the maximum permissible value for large systems, but
192           please understand that you may also     168           please understand that you may also need to set the skew_tick
193           kernel boot parameter to avoid conte    169           kernel boot parameter to avoid contention on the rcu_node
194           structure's locks.                      170           structure's locks.
195                                                   171 
196           Take the default if unsure.             172           Take the default if unsure.
197                                                   173 
                                                   >> 174 config RCU_FAST_NO_HZ
                                                   >> 175         bool "Accelerate last non-dyntick-idle CPU's grace periods"
                                                   >> 176         depends on NO_HZ_COMMON && SMP && RCU_EXPERT
                                                   >> 177         default n
                                                   >> 178         help
                                                   >> 179           This option permits CPUs to enter dynticks-idle state even if
                                                   >> 180           they have RCU callbacks queued, and prevents RCU from waking
                                                   >> 181           these CPUs up more than roughly once every four jiffies (by
                                                   >> 182           default, you can adjust this using the rcutree.rcu_idle_gp_delay
                                                   >> 183           parameter), thus improving energy efficiency.  On the other
                                                   >> 184           hand, this option increases the duration of RCU grace periods,
                                                   >> 185           for example, slowing down synchronize_rcu().
                                                   >> 186 
                                                   >> 187           Say Y if energy efficiency is critically important, and you
                                                   >> 188                 don't care about increased grace-period durations.
                                                   >> 189 
                                                   >> 190           Say N if you are unsure.
                                                   >> 191 
198 config RCU_BOOST                                  192 config RCU_BOOST
199         bool "Enable RCU priority boosting"       193         bool "Enable RCU priority boosting"
200         depends on (RT_MUTEXES && PREEMPT_RCU  !! 194         depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
201         default y if PREEMPT_RT                !! 195         default n
202         help                                      196         help
203           This option boosts the priority of p    197           This option boosts the priority of preempted RCU readers that
204           block the current preemptible RCU gr    198           block the current preemptible RCU grace period for too long.
205           This option also prevents heavy load    199           This option also prevents heavy loads from blocking RCU
206           callback invocation.                 !! 200           callback invocation for all flavors of RCU.
207                                                   201 
208           Say Y here if you are working with r    202           Say Y here if you are working with real-time apps or heavy loads
209           Say N here if you are unsure.           203           Say N here if you are unsure.
210                                                   204 
211 config RCU_BOOST_DELAY                            205 config RCU_BOOST_DELAY
212         int "Milliseconds to delay boosting af    206         int "Milliseconds to delay boosting after RCU grace-period start"
213         range 0 3000                              207         range 0 3000
214         depends on RCU_BOOST                      208         depends on RCU_BOOST
215         default 500                               209         default 500
216         help                                      210         help
217           This option specifies the time to wa    211           This option specifies the time to wait after the beginning of
218           a given grace period before priority    212           a given grace period before priority-boosting preempted RCU
219           readers blocking that grace period.     213           readers blocking that grace period.  Note that any RCU reader
220           blocking an expedited RCU grace peri    214           blocking an expedited RCU grace period is boosted immediately.
221                                                   215 
222           Accept the default if unsure.           216           Accept the default if unsure.
223                                                   217 
224 config RCU_EXP_KTHREAD                         << 
225         bool "Perform RCU expedited work in a  << 
226         depends on RCU_BOOST && RCU_EXPERT     << 
227         default !PREEMPT_RT && NR_CPUS <= 32   << 
228         help                                   << 
229           Use this option to further reduce th << 
230           grace periods at the expense of bein << 
231                                                << 
232           This option is disabled by default o << 
233           disable expedited grace periods afte << 
234           setting rcupdate.rcu_normal_after_bo << 
235                                                << 
236           Accept the default if unsure.        << 
237                                                << 
238 config RCU_NOCB_CPU                               218 config RCU_NOCB_CPU
239         bool "Offload RCU callback processing     219         bool "Offload RCU callback processing from boot-selected CPUs"
240         depends on TREE_RCU                    !! 220         depends on TREE_RCU || PREEMPT_RCU
241         depends on RCU_EXPERT || NO_HZ_FULL       221         depends on RCU_EXPERT || NO_HZ_FULL
242         default n                                 222         default n
243         help                                      223         help
244           Use this option to reduce OS jitter     224           Use this option to reduce OS jitter for aggressive HPC or
245           real-time workloads.  It can also be    225           real-time workloads.  It can also be used to offload RCU
246           callback invocation to energy-effici    226           callback invocation to energy-efficient CPUs in battery-powered
247           asymmetric multiprocessors.  The pri !! 227           asymmetric multiprocessors.
248           is that the overhead of call_rcu() i << 
249           workloads will incur significant inc << 
250           rates.                               << 
251                                                << 
252           This option offloads callback invoca << 
253           specified at boot time by the rcu_no << 
254           such CPU, a kthread ("rcuox/N") will << 
255           callbacks, where the "N" is the CPU  << 
256           the "x" is "p" for RCU-preempt (PREE << 
257           RCU-sched (!PREEMPTION kernels).  No << 
258           from running on the specified CPUs,  << 
259           preempted between each callback, and << 
260           be used to force the kthreads to run << 
261           desired.                             << 
262                                                   228 
263           Say Y here if you need reduced OS ji !! 229           This option offloads callback invocation from the set of
264           Say N here if you are unsure.        !! 230           CPUs specified at boot time by the rcu_nocbs parameter.
265                                                !! 231           For each such CPU, a kthread ("rcuox/N") will be created to
266 config RCU_NOCB_CPU_DEFAULT_ALL                !! 232           invoke callbacks, where the "N" is the CPU being offloaded,
267         bool "Offload RCU callback processing  !! 233           and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and
268         depends on RCU_NOCB_CPU                !! 234           "s" for RCU-sched.  Nothing prevents this kthread from running
269         default n                              !! 235           on the specified CPUs, but (1) the kthreads may be preempted
270         help                                   !! 236           between each callback, and (2) affinity or cgroups can be used
271           Use this option to offload callback  !! 237           to force the kthreads to run on whatever set of CPUs is desired.
272           by default, in the absence of the rc << 
273           parameter. This also avoids the need << 
274           to achieve the effect of offloading  << 
275                                                << 
276           Say Y here if you want offload all C << 
277           Say N here if you are unsure.        << 
278                                                << 
279 config RCU_NOCB_CPU_CB_BOOST                   << 
280         bool "Offload RCU callback from real-t << 
281         depends on RCU_NOCB_CPU && RCU_BOOST   << 
282         default y if PREEMPT_RT                << 
283         help                                   << 
284           Use this option to invoke offloaded  << 
285           to avoid starvation by heavy SCHED_O << 
286           Of course, running as SCHED_FIFO dur << 
287           cause the rcuo[ps] kthreads to monop << 
288           of milliseconds or more.  Therefore, << 
289           it is your responsibility to ensure  << 
290           tasks either run with higher priorit << 
291                                                << 
292           Say Y here if you want to set RT pri << 
293           Say N here if you are building a !PR << 
294                                                << 
295 config TASKS_TRACE_RCU_READ_MB                 << 
296         bool "Tasks Trace RCU readers use memo << 
297         depends on RCU_EXPERT && TASKS_TRACE_R << 
298         default PREEMPT_RT || NR_CPUS < 8      << 
299         help                                   << 
300           Use this option to further reduce th << 
301           to CPUs executing in userspace or id << 
302           RCU grace periods.  Given that a rea << 
303           the rcupdate.rcu_task_ipi_delay kern << 
304           eliminates such IPIs for many worklo << 
305           of this Kconfig option is important  << 
306           real-time installations and for batt << 
307           hence the default chosen above.      << 
308                                                << 
309           Say Y here if you hate IPIs.         << 
310           Say N here if you hate read-side mem << 
311           Take the default if you are unsure.  << 
312                                                << 
313 config RCU_LAZY                                << 
314         bool "RCU callback lazy invocation fun << 
315         depends on RCU_NOCB_CPU                << 
316         default n                              << 
317         help                                   << 
318           To save power, batch RCU callbacks a << 
319           pressure, or callback list growing t << 
320                                                << 
321           Requires rcu_nocbs=all to be set.    << 
322                                                << 
323           Use rcutree.enable_rcu_lazy=0 to tur << 
324                                                << 
325 config RCU_LAZY_DEFAULT_OFF                    << 
326         bool "Turn RCU lazy invocation off by  << 
327         depends on RCU_LAZY                    << 
328         default n                              << 
329         help                                   << 
330           Allows building the kernel with CONF << 
331           off. Boot time param rcutree.enable_ << 
332           it back on.                          << 
333                                                << 
334 config RCU_DOUBLE_CHECK_CB_TIME                << 
335         bool "RCU callback-batch backup time c << 
336         depends on RCU_EXPERT                  << 
337         default n                              << 
338         help                                   << 
339           Use this option to provide more prec << 
340           rcutree.rcu_resched_ns module parame << 
341           a single RCU callback might run for  << 
342           thus defeating the 32-callback batch << 
343           cost of the fine-grained but expensi << 
344                                                << 
345           This option rounds rcutree.rcu_resch << 
346           jiffy, and overrides the 32-callback << 
347           is exceeded.                         << 
348                                                   238 
349           Say Y here if you need tighter callb !! 239           Say Y here if you want to help to debug reduced OS jitter.
350           Say N here if you are unsure.           240           Say N here if you are unsure.
351                                                   241 
352 endmenu # "RCU Subsystem"                         242 endmenu # "RCU Subsystem"
                                                      

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