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-rw-r--r--kernel/time/tick-sched.h64
1 files changed, 64 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.h b/kernel/time/tick-sched.h
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+++ b/kernel/time/tick-sched.h
@@ -0,0 +1,64 @@
+#ifndef _TICK_SCHED_H
+#define _TICK_SCHED_H
+
+#include <linux/hrtimer.h>
+
+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.
+ * @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;
+ 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;
+ unsigned long next_jiffies;
+ ktime_t idle_expires;
+ int do_timer_last;
+};
+
+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) { }
+#endif
+
+#endif