~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/linux/tick.h

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*  linux/include/linux/tick.h
  2  *
  3  *  This file contains the structure definitions for tick related functions
  4  *
  5  */
  6 #ifndef _LINUX_TICK_H
  7 #define _LINUX_TICK_H
  8 
  9 #include <linux/clockchips.h>
 10 #include <linux/irqflags.h>
 11 #include <linux/percpu.h>
 12 #include <linux/hrtimer.h>
 13 #include <linux/context_tracking_state.h>
 14 #include <linux/cpumask.h>
 15 
 16 #ifdef CONFIG_GENERIC_CLOCKEVENTS
 17 
 18 enum tick_device_mode {
 19         TICKDEV_MODE_PERIODIC,
 20         TICKDEV_MODE_ONESHOT,
 21 };
 22 
 23 struct tick_device {
 24         struct clock_event_device *evtdev;
 25         enum tick_device_mode mode;
 26 };
 27 
 28 enum tick_nohz_mode {
 29         NOHZ_MODE_INACTIVE,
 30         NOHZ_MODE_LOWRES,
 31         NOHZ_MODE_HIGHRES,
 32 };
 33 
 34 /**
 35  * struct tick_sched - sched tick emulation and no idle tick control/stats
 36  * @sched_timer:        hrtimer to schedule the periodic tick in high
 37  *                      resolution mode
 38  * @last_tick:          Store the last tick expiry time when the tick
 39  *                      timer is modified for nohz sleeps. This is necessary
 40  *                      to resume the tick timer operation in the timeline
 41  *                      when the CPU returns from nohz sleep.
 42  * @tick_stopped:       Indicator that the idle tick has been stopped
 43  * @idle_jiffies:       jiffies at the entry to idle for idle time accounting
 44  * @idle_calls:         Total number of idle calls
 45  * @idle_sleeps:        Number of idle calls, where the sched tick was stopped
 46  * @idle_entrytime:     Time when the idle call was entered
 47  * @idle_waketime:      Time when the idle was interrupted
 48  * @idle_exittime:      Time when the idle state was left
 49  * @idle_sleeptime:     Sum of the time slept in idle with sched tick stopped
 50  * @iowait_sleeptime:   Sum of the time slept in idle with sched tick stopped, with IO outstanding
 51  * @sleep_length:       Duration of the current idle sleep
 52  * @do_timer_lst:       CPU was the last one doing do_timer before going idle
 53  */
 54 struct tick_sched {
 55         struct hrtimer                  sched_timer;
 56         unsigned long                   check_clocks;
 57         enum tick_nohz_mode             nohz_mode;
 58         ktime_t                         last_tick;
 59         int                             inidle;
 60         int                             tick_stopped;
 61         unsigned long                   idle_jiffies;
 62         unsigned long                   idle_calls;
 63         unsigned long                   idle_sleeps;
 64         int                             idle_active;
 65         ktime_t                         idle_entrytime;
 66         ktime_t                         idle_waketime;
 67         ktime_t                         idle_exittime;
 68         ktime_t                         idle_sleeptime;
 69         ktime_t                         iowait_sleeptime;
 70         ktime_t                         sleep_length;
 71         unsigned long                   last_jiffies;
 72         unsigned long                   next_jiffies;
 73         ktime_t                         idle_expires;
 74         int                             do_timer_last;
 75 };
 76 
 77 extern void __init tick_init(void);
 78 extern int tick_is_oneshot_available(void);
 79 extern struct tick_device *tick_get_device(int cpu);
 80 
 81 # ifdef CONFIG_HIGH_RES_TIMERS
 82 extern int tick_init_highres(void);
 83 extern int tick_program_event(ktime_t expires, int force);
 84 extern void tick_setup_sched_timer(void);
 85 # endif
 86 
 87 # if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
 88 extern void tick_cancel_sched_timer(int cpu);
 89 # else
 90 static inline void tick_cancel_sched_timer(int cpu) { }
 91 # endif
 92 
 93 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 94 extern struct tick_device *tick_get_broadcast_device(void);
 95 extern struct cpumask *tick_get_broadcast_mask(void);
 96 
 97 #  ifdef CONFIG_TICK_ONESHOT
 98 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
 99 #  endif
100 
101 # endif /* BROADCAST */
102 
103 # ifdef CONFIG_TICK_ONESHOT
104 extern void tick_clock_notify(void);
105 extern int tick_check_oneshot_change(int allow_nohz);
106 extern struct tick_sched *tick_get_tick_sched(int cpu);
107 extern void tick_check_idle(int cpu);
108 extern int tick_oneshot_mode_active(void);
109 #  ifndef arch_needs_cpu
110 #   define arch_needs_cpu(cpu) (0)
111 #  endif
112 # else
113 static inline void tick_clock_notify(void) { }
114 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
115 static inline void tick_check_idle(int cpu) { }
116 static inline int tick_oneshot_mode_active(void) { return 0; }
117 # endif
118 
119 #else /* CONFIG_GENERIC_CLOCKEVENTS */
120 static inline void tick_init(void) { }
121 static inline void tick_cancel_sched_timer(int cpu) { }
122 static inline void tick_clock_notify(void) { }
123 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
124 static inline void tick_check_idle(int cpu) { }
125 static inline int tick_oneshot_mode_active(void) { return 0; }
126 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
127 
128 # ifdef CONFIG_NO_HZ_COMMON
129 DECLARE_PER_CPU(struct tick_sched, tick_cpu_sched);
130 
131 static inline int tick_nohz_tick_stopped(void)
132 {
133         return __this_cpu_read(tick_cpu_sched.tick_stopped);
134 }
135 
136 extern void tick_nohz_idle_enter(void);
137 extern void tick_nohz_idle_exit(void);
138 extern void tick_nohz_irq_exit(void);
139 extern ktime_t tick_nohz_get_sleep_length(void);
140 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
141 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
142 
143 # else /* !CONFIG_NO_HZ_COMMON */
144 static inline int tick_nohz_tick_stopped(void)
145 {
146         return 0;
147 }
148 
149 static inline void tick_nohz_idle_enter(void) { }
150 static inline void tick_nohz_idle_exit(void) { }
151 
152 static inline ktime_t tick_nohz_get_sleep_length(void)
153 {
154         ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
155 
156         return len;
157 }
158 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
159 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
160 # endif /* !CONFIG_NO_HZ_COMMON */
161 
162 #ifdef CONFIG_NO_HZ_FULL
163 extern bool tick_nohz_full_running;
164 extern cpumask_var_t tick_nohz_full_mask;
165 
166 static inline bool tick_nohz_full_enabled(void)
167 {
168         if (!static_key_false(&context_tracking_enabled))
169                 return false;
170 
171         return tick_nohz_full_running;
172 }
173 
174 static inline bool tick_nohz_full_cpu(int cpu)
175 {
176         if (!tick_nohz_full_enabled())
177                 return false;
178 
179         return cpumask_test_cpu(cpu, tick_nohz_full_mask);
180 }
181 
182 extern void tick_nohz_init(void);
183 extern void __tick_nohz_full_check(void);
184 extern void tick_nohz_full_kick(void);
185 extern void tick_nohz_full_kick_all(void);
186 extern void __tick_nohz_task_switch(struct task_struct *tsk);
187 #else
188 static inline void tick_nohz_init(void) { }
189 static inline bool tick_nohz_full_enabled(void) { return false; }
190 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
191 static inline void __tick_nohz_full_check(void) { }
192 static inline void tick_nohz_full_kick(void) { }
193 static inline void tick_nohz_full_kick_all(void) { }
194 static inline void __tick_nohz_task_switch(struct task_struct *tsk) { }
195 #endif
196 
197 static inline void tick_nohz_full_check(void)
198 {
199         if (tick_nohz_full_enabled())
200                 __tick_nohz_full_check();
201 }
202 
203 static inline void tick_nohz_task_switch(struct task_struct *tsk)
204 {
205         if (tick_nohz_full_enabled())
206                 __tick_nohz_task_switch(tsk);
207 }
208 
209 
210 #endif
211 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp