mm/page_alloc: prevent merging between isolated and other pageblocks
[linux-2.6-block.git] / kernel / time / tick-sched.h
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1#ifndef _TICK_SCHED_H
2#define _TICK_SCHED_H
3
4#include <linux/hrtimer.h>
5
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6enum tick_device_mode {
7 TICKDEV_MODE_PERIODIC,
8 TICKDEV_MODE_ONESHOT,
9};
10
11struct tick_device {
12 struct clock_event_device *evtdev;
13 enum tick_device_mode mode;
14};
15
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16enum tick_nohz_mode {
17 NOHZ_MODE_INACTIVE,
18 NOHZ_MODE_LOWRES,
19 NOHZ_MODE_HIGHRES,
20};
21
22/**
23 * struct tick_sched - sched tick emulation and no idle tick control/stats
24 * @sched_timer: hrtimer to schedule the periodic tick in high
25 * resolution mode
26 * @last_tick: Store the last tick expiry time when the tick
27 * timer is modified for nohz sleeps. This is necessary
28 * to resume the tick timer operation in the timeline
29 * when the CPU returns from nohz sleep.
30 * @tick_stopped: Indicator that the idle tick has been stopped
31 * @idle_jiffies: jiffies at the entry to idle for idle time accounting
32 * @idle_calls: Total number of idle calls
33 * @idle_sleeps: Number of idle calls, where the sched tick was stopped
34 * @idle_entrytime: Time when the idle call was entered
35 * @idle_waketime: Time when the idle was interrupted
36 * @idle_exittime: Time when the idle state was left
37 * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped
38 * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding
39 * @sleep_length: Duration of the current idle sleep
40 * @do_timer_lst: CPU was the last one doing do_timer before going idle
41 */
42struct tick_sched {
43 struct hrtimer sched_timer;
44 unsigned long check_clocks;
45 enum tick_nohz_mode nohz_mode;
46 ktime_t last_tick;
47 int inidle;
48 int tick_stopped;
49 unsigned long idle_jiffies;
50 unsigned long idle_calls;
51 unsigned long idle_sleeps;
52 int idle_active;
53 ktime_t idle_entrytime;
54 ktime_t idle_waketime;
55 ktime_t idle_exittime;
56 ktime_t idle_sleeptime;
57 ktime_t iowait_sleeptime;
58 ktime_t sleep_length;
59 unsigned long last_jiffies;
c1ad348b 60 u64 next_timer;
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61 ktime_t idle_expires;
62 int do_timer_last;
d027d45d 63 unsigned long tick_dep_mask;
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64};
65
66extern struct tick_sched *tick_get_tick_sched(int cpu);
67
68extern void tick_setup_sched_timer(void);
69#if defined CONFIG_NO_HZ_COMMON || defined CONFIG_HIGH_RES_TIMERS
70extern void tick_cancel_sched_timer(int cpu);
71#else
72static inline void tick_cancel_sched_timer(int cpu) { }
73#endif
74
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75#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
76extern int __tick_broadcast_oneshot_control(enum tick_broadcast_state state);
77#else
78static inline int
79__tick_broadcast_oneshot_control(enum tick_broadcast_state state)
80{
81 return -EBUSY;
82}
83#endif
84
c1797baf 85#endif