diff options
Diffstat (limited to 'include/linux/tick.h')
| -rw-r--r-- | include/linux/tick.h | 71 |
1 files changed, 69 insertions, 2 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h index e5c0a4e22706..cf435e459598 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -20,12 +20,79 @@ struct tick_device { enum tick_device_mode mode; }; +enum tick_nohz_mode { + NOHZ_MODE_INACTIVE, + NOHZ_MODE_LOWRES, + NOHZ_MODE_HIGHRES, +}; + +/** + * struct tick_sched - sched tick emulation and no idle tick control/stats + * @sched_timer: hrtimer to schedule the periodic tick in high + * resolution mode + * @idle_tick: Store the last idle tick expiry time when the tick + * timer is modified for idle sleeps. This is necessary + * to resume the tick timer operation in the timeline + * when the CPU returns from idle + * @tick_stopped: Indicator that the idle tick has been stopped + * @idle_jiffies: jiffies at the entry to idle for idle time accounting + * @idle_calls: Total number of idle calls + * @idle_sleeps: Number of idle calls, where the sched tick was stopped + * @idle_entrytime: Time when the idle call was entered + * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped + */ +struct tick_sched { + struct hrtimer sched_timer; + unsigned long check_clocks; + enum tick_nohz_mode nohz_mode; + ktime_t idle_tick; + int tick_stopped; + unsigned long idle_jiffies; + unsigned long idle_calls; + unsigned long idle_sleeps; + ktime_t idle_entrytime; + ktime_t idle_sleeptime; + unsigned long last_jiffies; + unsigned long next_jiffies; + ktime_t idle_expires; +}; + extern void __init tick_init(void); +extern int tick_is_oneshot_available(void); + +# ifdef CONFIG_HIGH_RES_TIMERS +extern int tick_init_highres(void); +extern int tick_program_event(ktime_t expires, int force); +extern void tick_setup_sched_timer(void); +extern void tick_cancel_sched_timer(int cpu); +# else +static inline void tick_cancel_sched_timer(int cpu) { } +# endif /* HIGHRES */ -#else +# ifdef CONFIG_TICK_ONESHOT +extern void tick_clock_notify(void); +extern int tick_check_oneshot_change(int allow_nohz); +extern struct tick_sched *tick_get_tick_sched(int cpu); +# else +static inline void tick_clock_notify(void) { } +static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } +# endif +#else /* CONFIG_GENERIC_CLOCKEVENTS */ static inline void tick_init(void) { } +static inline void tick_cancel_sched_timer(int cpu) { } +static inline void tick_clock_notify(void) { } +static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } +#endif /* !CONFIG_GENERIC_CLOCKEVENTS */ -#endif +# ifdef CONFIG_NO_HZ +extern void tick_nohz_stop_sched_tick(void); +extern void tick_nohz_restart_sched_tick(void); +extern void tick_nohz_update_jiffies(void); +# else +static inline void tick_nohz_stop_sched_tick(void) { } +static inline void tick_nohz_restart_sched_tick(void) { } +static inline void tick_nohz_update_jiffies(void) { } +# endif /* !NO_HZ */ #endif |