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Release 4.15 kernel/time/tick-sched.h

Directory: kernel/time
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _TICK_SCHED_H

#define _TICK_SCHED_H

#include <linux/hrtimer.h>


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;
	
atomic_t			tick_dep_mask;
};

extern struct tick_sched *tick_get_tick_sched(int cpu);

extern void tick_setup_sched_timer(void);
#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) { }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner9100.00%1100.00%
Total9100.00%1100.00%

#endif #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state); #else
static inline int __tick_broadcast_oneshot_control(enum tick_broadcast_state state) { return -EBUSY; }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner15100.00%1100.00%
Total15100.00%1100.00%

#endif #endif

Overall Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner19195.98%450.00%
Frédéric Weisbecker73.52%337.50%
Greg Kroah-Hartman10.50%112.50%
Total199100.00%8100.00%
Directory: kernel/time
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