Edit File: tick.h
/* linux/include/linux/tick.h * * This file contains the structure definitions for tick related functions * */ #ifndef _LINUX_TICK_H #define _LINUX_TICK_H #include <linux/clockchips.h> #include <linux/irqflags.h> #include <linux/percpu.h> #include <linux/hrtimer.h> #include <linux/context_tracking_state.h> #include <linux/cpumask.h> #include <linux/sched.h> #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu); #else static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { } #endif #ifdef CONFIG_GENERIC_CLOCKEVENTS enum tick_device_mode { TICKDEV_MODE_PERIODIC, TICKDEV_MODE_ONESHOT, }; struct tick_device { struct clock_event_device *evtdev; 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 * @last_tick: Store the last tick expiry time when the tick * timer is modified for nohz sleeps. This is necessary * to resume the tick timer operation in the timeline * when the CPU returns from nohz sleep. * @next_tick: Next tick to be fired when in dynticks mode. * @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_waketime: Time when the idle was interrupted * @idle_exittime: Time when the idle state was left * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding * @sleep_length: Duration of the current idle sleep * @do_timer_lst: CPU was the last one doing do_timer before going idle */ struct tick_sched { struct hrtimer sched_timer; unsigned long check_clocks; enum tick_nohz_mode nohz_mode; ktime_t last_tick; ktime_t next_tick; int inidle; int tick_stopped; unsigned long idle_jiffies; unsigned long idle_calls; unsigned long idle_sleeps; int idle_active; ktime_t idle_entrytime; ktime_t idle_waketime; ktime_t idle_exittime; ktime_t idle_sleeptime; ktime_t iowait_sleeptime; ktime_t sleep_length; unsigned long last_jiffies; u64 next_timer; ktime_t idle_expires; int do_timer_last; }; extern void __init tick_init(void); extern int tick_is_oneshot_available(void); extern struct tick_device *tick_get_device(int cpu); # 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); # endif # if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS extern void tick_cancel_sched_timer(int cpu); # else static inline void tick_cancel_sched_timer(int cpu) { } # endif # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST extern struct tick_device *tick_get_broadcast_device(void); extern struct cpumask *tick_get_broadcast_mask(void); # ifdef CONFIG_TICK_ONESHOT extern struct cpumask *tick_get_broadcast_oneshot_mask(void); # endif # endif /* BROADCAST */ # 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); extern void tick_check_idle(void); extern int tick_oneshot_mode_active(void); # ifndef arch_needs_cpu # define arch_needs_cpu(cpu) (0) # endif # else static inline void tick_clock_notify(void) { } static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } static inline void tick_check_idle(void) { } static inline int tick_oneshot_mode_active(void) { 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; } static inline void tick_check_idle(void) { } static inline int tick_oneshot_mode_active(void) { return 0; } #endif /* !CONFIG_GENERIC_CLOCKEVENTS */ # ifdef CONFIG_NO_HZ_COMMON DECLARE_PER_CPU(struct tick_sched, tick_cpu_sched); static inline int tick_nohz_tick_stopped(void) { return __this_cpu_read(tick_cpu_sched.tick_stopped); } extern void tick_nohz_idle_enter(void); extern void tick_nohz_idle_exit(void); extern void tick_nohz_irq_exit(void); extern ktime_t tick_nohz_get_sleep_length(void); extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); # else /* !CONFIG_NO_HZ_COMMON */ static inline int tick_nohz_tick_stopped(void) { return 0; } static inline void tick_nohz_idle_enter(void) { } static inline void tick_nohz_idle_exit(void) { } static inline ktime_t tick_nohz_get_sleep_length(void) { ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; return len; } static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } # endif /* !CONFIG_NO_HZ_COMMON */ #ifdef CONFIG_NO_HZ_FULL extern bool tick_nohz_full_running; extern cpumask_var_t tick_nohz_full_mask; extern cpumask_var_t housekeeping_mask; static inline bool tick_nohz_full_enabled(void) { if (!context_tracking_is_enabled()) return false; return tick_nohz_full_running; } static inline bool tick_nohz_full_cpu(int cpu) { if (!tick_nohz_full_enabled()) return false; return cpumask_test_cpu(cpu, tick_nohz_full_mask); } static inline int housekeeping_any_cpu(void) { return cpumask_any_and(housekeeping_mask, cpu_online_mask); } extern void tick_nohz_init(void); extern void __tick_nohz_full_check(void); extern void tick_nohz_full_kick(void); extern void tick_nohz_full_kick_cpu(int cpu); extern void tick_nohz_full_kick_all(void); extern void __tick_nohz_task_switch(struct task_struct *tsk); #else static inline int housekeeping_any_cpu(void) { return smp_processor_id(); } static inline void tick_nohz_init(void) { } static inline bool tick_nohz_full_enabled(void) { return false; } static inline bool tick_nohz_full_cpu(int cpu) { return false; } static inline void __tick_nohz_full_check(void) { } static inline void tick_nohz_full_kick_cpu(int cpu) { } static inline void tick_nohz_full_kick(void) { } static inline void tick_nohz_full_kick_all(void) { } static inline void __tick_nohz_task_switch(struct task_struct *tsk) { } #endif static inline bool is_housekeeping_cpu(int cpu) { #ifdef CONFIG_NO_HZ_FULL if (tick_nohz_full_enabled()) return cpumask_test_cpu(cpu, housekeeping_mask); #endif return true; } static inline void tick_nohz_full_check(void) { if (tick_nohz_full_enabled()) __tick_nohz_full_check(); } static inline void tick_nohz_task_switch(struct task_struct *tsk) { if (tick_nohz_full_enabled()) __tick_nohz_task_switch(tsk); } #endif