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6378ddb592
Current idle time in kstat is based on jiffies and is coarse grained. tick_sched.idle_sleeptime is making some attempt to keep track of idle time in a fine grained manner. But, it is not handling the time spent in interrupts fully. Make tick_sched.idle_sleeptime accurate with respect to time spent on handling interrupts and also add tick_sched.idle_lastupdate, which keeps track of last time when idle_sleeptime was updated. This statistics will be crucial for cpufreq-ondemand governor, which can shed some conservative gaurd band that is uses today while setting the frequency. The ondemand changes that uses the exact idle time is coming soon. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
/* linux/include/linux/tick.h
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*
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* This file contains the structure definitions for tick related functions
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*
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*/
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#ifndef _LINUX_TICK_H
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#define _LINUX_TICK_H
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#include <linux/clockchips.h>
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#ifdef CONFIG_GENERIC_CLOCKEVENTS
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enum tick_device_mode {
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TICKDEV_MODE_PERIODIC,
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TICKDEV_MODE_ONESHOT,
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};
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struct tick_device {
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struct clock_event_device *evtdev;
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enum tick_device_mode mode;
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};
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enum tick_nohz_mode {
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NOHZ_MODE_INACTIVE,
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NOHZ_MODE_LOWRES,
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NOHZ_MODE_HIGHRES,
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};
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/**
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* struct tick_sched - sched tick emulation and no idle tick control/stats
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* @sched_timer: hrtimer to schedule the periodic tick in high
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* resolution mode
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* @idle_tick: Store the last idle tick expiry time when the tick
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* timer is modified for idle sleeps. This is necessary
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* to resume the tick timer operation in the timeline
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* when the CPU returns from idle
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* @tick_stopped: Indicator that the idle tick has been stopped
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* @idle_jiffies: jiffies at the entry to idle for idle time accounting
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* @idle_calls: Total number of idle calls
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* @idle_sleeps: Number of idle calls, where the sched tick was stopped
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* @idle_entrytime: Time when the idle call was entered
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* @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
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* @sleep_length: Duration of the current idle sleep
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*/
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struct tick_sched {
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struct hrtimer sched_timer;
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unsigned long check_clocks;
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enum tick_nohz_mode nohz_mode;
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ktime_t idle_tick;
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int tick_stopped;
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unsigned long idle_jiffies;
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unsigned long idle_calls;
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unsigned long idle_sleeps;
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int idle_active;
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ktime_t idle_entrytime;
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ktime_t idle_sleeptime;
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ktime_t idle_lastupdate;
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ktime_t sleep_length;
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unsigned long last_jiffies;
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unsigned long next_jiffies;
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ktime_t idle_expires;
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};
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extern void __init tick_init(void);
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extern int tick_is_oneshot_available(void);
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extern struct tick_device *tick_get_device(int cpu);
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# ifdef CONFIG_HIGH_RES_TIMERS
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extern int tick_init_highres(void);
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extern int tick_program_event(ktime_t expires, int force);
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extern void tick_setup_sched_timer(void);
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extern void tick_cancel_sched_timer(int cpu);
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# else
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static inline void tick_cancel_sched_timer(int cpu) { }
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# endif /* HIGHRES */
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# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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extern struct tick_device *tick_get_broadcast_device(void);
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extern cpumask_t *tick_get_broadcast_mask(void);
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# ifdef CONFIG_TICK_ONESHOT
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extern cpumask_t *tick_get_broadcast_oneshot_mask(void);
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# endif
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# endif /* BROADCAST */
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# ifdef CONFIG_TICK_ONESHOT
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extern void tick_clock_notify(void);
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extern int tick_check_oneshot_change(int allow_nohz);
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extern struct tick_sched *tick_get_tick_sched(int cpu);
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# else
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static inline void tick_clock_notify(void) { }
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static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
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# endif
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#else /* CONFIG_GENERIC_CLOCKEVENTS */
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static inline void tick_init(void) { }
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static inline void tick_cancel_sched_timer(int cpu) { }
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static inline void tick_clock_notify(void) { }
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static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
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#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
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# ifdef CONFIG_NO_HZ
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extern void tick_nohz_stop_sched_tick(void);
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extern void tick_nohz_restart_sched_tick(void);
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extern void tick_nohz_update_jiffies(void);
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extern ktime_t tick_nohz_get_sleep_length(void);
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extern void tick_nohz_stop_idle(int cpu);
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extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
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# else
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static inline void tick_nohz_stop_sched_tick(void) { }
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static inline void tick_nohz_restart_sched_tick(void) { }
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static inline void tick_nohz_update_jiffies(void) { }
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static inline ktime_t tick_nohz_get_sleep_length(void)
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{
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ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
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return len;
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}
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static inline void tick_nohz_stop_idle(int cpu) { }
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static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return 0; }
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# endif /* !NO_HZ */
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#endif
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