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Linux/kernel/time/Kconfig

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Diff markup

Differences between /kernel/time/Kconfig (Version linux-6.11.5) and /kernel/time/Kconfig (Version linux-2.6.0)


  1 # SPDX-License-Identifier: GPL-2.0-only           
  2 #                                                 
  3 # Timer subsystem related configuration option    
  4 #                                                 
  5                                                   
  6 # Options selectable by arch Kconfig              
  7                                                   
  8 # Watchdog function for clocksources to detect    
  9 config CLOCKSOURCE_WATCHDOG                       
 10         bool                                      
 11                                                   
 12 # Architecture has extra clocksource data         
 13 config ARCH_CLOCKSOURCE_DATA                      
 14         bool                                      
 15                                                   
 16 # Architecture has extra clocksource init call    
 17 config ARCH_CLOCKSOURCE_INIT                      
 18         bool                                      
 19                                                   
 20 # Clocksources require validation of the clock    
 21 # cycle update - x86/TSC misfeature               
 22 config CLOCKSOURCE_VALIDATE_LAST_CYCLE            
 23         bool                                      
 24                                                   
 25 # Timekeeping vsyscall support                    
 26 config GENERIC_TIME_VSYSCALL                      
 27         bool                                      
 28                                                   
 29 # The generic clock events infrastructure         
 30 config GENERIC_CLOCKEVENTS                        
 31         def_bool !LEGACY_TIMER_TICK               
 32                                                   
 33 # Architecture can handle broadcast in a drive    
 34 config ARCH_HAS_TICK_BROADCAST                    
 35         bool                                      
 36                                                   
 37 # Clockevents broadcasting infrastructure         
 38 config GENERIC_CLOCKEVENTS_BROADCAST              
 39         bool                                      
 40         depends on GENERIC_CLOCKEVENTS            
 41                                                   
 42 # Handle broadcast in default_idle_call()         
 43 config GENERIC_CLOCKEVENTS_BROADCAST_IDLE         
 44         bool                                      
 45         depends on GENERIC_CLOCKEVENTS_BROADCA    
 46                                                   
 47 # Automatically adjust the min. reprogramming     
 48 # clock event device                              
 49 config GENERIC_CLOCKEVENTS_MIN_ADJUST             
 50         bool                                      
 51                                                   
 52 # Generic update of CMOS clock                    
 53 config GENERIC_CMOS_UPDATE                        
 54         bool                                      
 55                                                   
 56 # Select to handle posix CPU timers from task_    
 57 # and not from the timer interrupt context        
 58 config HAVE_POSIX_CPU_TIMERS_TASK_WORK            
 59         bool                                      
 60                                                   
 61 config POSIX_CPU_TIMERS_TASK_WORK                 
 62         bool                                      
 63         default y if POSIX_TIMERS && HAVE_POSI    
 64                                                   
 65 config LEGACY_TIMER_TICK                          
 66         bool                                      
 67         help                                      
 68           The legacy timer tick helper is used    
 69           lack support for the generic clockev    
 70           New platforms should use generic clo    
 71                                                   
 72 config TIME_KUNIT_TEST                            
 73         tristate "KUnit test for kernel/time f    
 74         depends on KUNIT                          
 75         default KUNIT_ALL_TESTS                   
 76         help                                      
 77           Enable this option to test RTC libra    
 78                                                   
 79           If unsure, say N.                       
 80                                                   
 81 config CONTEXT_TRACKING                           
 82         bool                                      
 83                                                   
 84 config CONTEXT_TRACKING_IDLE                      
 85         bool                                      
 86         select CONTEXT_TRACKING                   
 87         help                                      
 88           Tracks idle state on behalf of RCU.     
 89                                                   
 90 if GENERIC_CLOCKEVENTS                            
 91 menu "Timers subsystem"                           
 92                                                   
 93 # Core internal switch. Selected by NO_HZ_COMM    
 94 # only related to the tick functionality. Ones    
 95 # are supported independent of this.              
 96 config TICK_ONESHOT                               
 97         bool                                      
 98                                                   
 99 config NO_HZ_COMMON                               
100         bool                                      
101         select TICK_ONESHOT                       
102                                                   
103 choice                                            
104         prompt "Timer tick handling"              
105         default NO_HZ_IDLE if NO_HZ               
106                                                   
107 config HZ_PERIODIC                                
108         bool "Periodic timer ticks (constant r    
109         help                                      
110           This option keeps the tick running p    
111           rate, even when the CPU doesn't need    
112                                                   
113 config NO_HZ_IDLE                                 
114         bool "Idle dynticks system (tickless i    
115         select NO_HZ_COMMON                       
116         help                                      
117           This option enables a tickless idle     
118           will only trigger on an as-needed ba    
119           This is usually interesting for ener    
120                                                   
121           Most of the time you want to say Y h    
122                                                   
123 config NO_HZ_FULL                                 
124         bool "Full dynticks system (tickless)"    
125         # NO_HZ_COMMON dependency                 
126         # We need at least one periodic CPU fo    
127         depends on SMP                            
128         depends on HAVE_CONTEXT_TRACKING_USER     
129         # VIRT_CPU_ACCOUNTING_GEN dependency      
130         depends on HAVE_VIRT_CPU_ACCOUNTING_GE    
131         select NO_HZ_COMMON                       
132         select RCU_NOCB_CPU                       
133         select VIRT_CPU_ACCOUNTING_GEN            
134         select IRQ_WORK                           
135         select CPU_ISOLATION                      
136         help                                      
137          Adaptively try to shutdown the tick w    
138          the CPU is running tasks. Typically t    
139          task on the CPU. Chances for running     
140          the task mostly runs in userspace and    
141                                                   
142          You need to fill up the nohz_full boo    
143          desired range of dynticks CPUs to use    
144          the expense of some overhead in user     
145          syscalls, exceptions and interrupts.     
146                                                   
147          By default, without passing the nohz_    
148          like NO_HZ_IDLE.                         
149                                                   
150          If you're a distro say Y.                
151                                                   
152 endchoice                                         
153                                                   
154 config CONTEXT_TRACKING_USER                      
155         bool                                      
156         depends on HAVE_CONTEXT_TRACKING_USER     
157         select CONTEXT_TRACKING                   
158         help                                      
159           Track transitions between kernel and    
160           tickless cputime accounting. The for    
161           tracking to enter/exit RCU extended     
162                                                   
163 config CONTEXT_TRACKING_USER_FORCE                
164         bool "Force user context tracking"        
165         depends on CONTEXT_TRACKING_USER          
166         default y if !NO_HZ_FULL                  
167         help                                      
168           The major pre-requirement for full d    
169           support the user context tracking su    
170           other dependencies to provide in ord    
171           dynticks working.                       
172                                                   
173           This option stands for testing when     
174           user context tracking backend but do    
175           requirements to make the full dyntic    
176           Without the full dynticks, there is     
177           for user context tracking and the su    
178           userspace extended quiescent state a    
179           accounting. This option copes with t    
180           dynticks subsystem by forcing the us    
181           CPUs in the system.                     
182                                                   
183           Say Y only if you're working on the     
184           architecture backend for the user co    
185                                                   
186           Say N otherwise, this option brings     
187           don't want in production.               
188                                                   
189 config NO_HZ                                      
190         bool "Old Idle dynticks config"           
191         help                                      
192           This is the old config entry that en    
193           We keep it around for a little while    
194           compatibility with older config file    
195                                                   
196 config HIGH_RES_TIMERS                            
197         bool "High Resolution Timer Support"      
198         select TICK_ONESHOT                       
199         help                                      
200           This option enables high resolution     
201           hardware is not capable then this op    
202           the size of the kernel image.           
203                                                   
204 config CLOCKSOURCE_WATCHDOG_MAX_SKEW_US           
205         int "Clocksource watchdog maximum allo    
206         depends on CLOCKSOURCE_WATCHDOG           
207         range 50 1000                             
208         default 125                               
209         help                                      
210           Specify the maximum amount of allowa    
211           microseconds before reporting the cl    
212           The default is based on a half-secon    
213           interval and NTP's maximum frequency    
214           per million.  If the clocksource is     
215           it is good enough for the clocksourc    
216                                                   
217 endmenu                                           
218 endif                                             
                                                      

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