kernel/time/tick-sched.h

   1 #ifndef _TICK_SCHED_H
   2 #define _TICK_SCHED_H
   3
   4 #include <linux/hrtimer.h>
   5
   6 enum tick_nohz_mode {
   7         NOHZ_MODE_INACTIVE,
   8         NOHZ_MODE_LOWRES,
   9         NOHZ_MODE_HIGHRES,
  10 };
  11
  12 /**
  13  * struct tick_sched - sched tick emulation and no idle tick control/stats
  14  * @sched_timer:        hrtimer to schedule the periodic tick in high
  15  *                      resolution mode
  16  * @last_tick:          Store the last tick expiry time when the tick
  17  *                      timer is modified for nohz sleeps. This is necessary
  18  *                      to resume the tick timer operation in the timeline
  19  *                      when the CPU returns from nohz sleep.
  20  * @tick_stopped:       Indicator that the idle tick has been stopped
  21  * @idle_jiffies:       jiffies at the entry to idle for idle time accounting
  22  * @idle_calls:         Total number of idle calls
  23  * @idle_sleeps:        Number of idle calls, where the sched tick was stopped
  24  * @idle_entrytime:     Time when the idle call was entered
  25  * @idle_waketime:      Time when the idle was interrupted
  26  * @idle_exittime:      Time when the idle state was left
  27  * @idle_sleeptime:     Sum of the time slept in idle with sched tick stopped
  28  * @iowait_sleeptime:   Sum of the time slept in idle with sched tick stopped, with IO outstanding
  29  * @sleep_length:       Duration of the current idle sleep
  30  * @do_timer_lst:       CPU was the last one doing do_timer before going idle
  31  */
  32 struct tick_sched {
  33         struct hrtimer                  sched_timer;
  34         unsigned long                   check_clocks;
  35         enum tick_nohz_mode             nohz_mode;
  36         ktime_t                         last_tick;
  37         int                             inidle;
  38         int                             tick_stopped;
  39         unsigned long                   idle_jiffies;
  40         unsigned long                   idle_calls;
  41         unsigned long                   idle_sleeps;
  42         int                             idle_active;
  43         ktime_t                         idle_entrytime;
  44         ktime_t                         idle_waketime;
  45         ktime_t                         idle_exittime;
  46         ktime_t                         idle_sleeptime;
  47         ktime_t                         iowait_sleeptime;
  48         ktime_t                         sleep_length;
  49         unsigned long                   last_jiffies;
  50         unsigned long                   next_jiffies;
  51         ktime_t                         idle_expires;
  52         int                             do_timer_last;
  53 };
  54
  55 extern struct tick_sched *tick_get_tick_sched(int cpu);
  56
  57 extern void tick_setup_sched_timer(void);
  58 #if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
  59 extern void tick_cancel_sched_timer(int cpu);
  60 #else
  61 static inline void tick_cancel_sched_timer(int cpu) { }
  62 #endif
  63
  64 #endif