tick-common.c (da733563be5a9da26fe81d9f007262d00b846e22) tick-common.c (d6ad418763888f617ac5b4849823e4cd670df1dd)
1/*
2 * linux/kernel/time/tick-common.c
3 *
4 * This file contains the base functions to manage periodic tick
5 * related events.
6 *
7 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
8 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar

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58}
59
60/*
61 * Periodic tick
62 */
63static void tick_periodic(int cpu)
64{
65 if (tick_do_timer_cpu == cpu) {
1/*
2 * linux/kernel/time/tick-common.c
3 *
4 * This file contains the base functions to manage periodic tick
5 * related events.
6 *
7 * Copyright(C) 2005-2006, Thomas Gleixner <tglx@linutronix.de>
8 * Copyright(C) 2005-2007, Red Hat, Inc., Ingo Molnar

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58}
59
60/*
61 * Periodic tick
62 */
63static void tick_periodic(int cpu)
64{
65 if (tick_do_timer_cpu == cpu) {
66 write_seqlock(&xtime_lock);
66 write_seqlock(&jiffies_lock);
67
68 /* Keep track of the next tick event */
69 tick_next_period = ktime_add(tick_next_period, tick_period);
70
71 do_timer(1);
67
68 /* Keep track of the next tick event */
69 tick_next_period = ktime_add(tick_next_period, tick_period);
70
71 do_timer(1);
72 write_sequnlock(&xtime_lock);
72 write_sequnlock(&jiffies_lock);
73 }
74
75 update_process_times(user_mode(get_irq_regs()));
76 profile_tick(CPU_PROFILING);
77}
78
79/*
80 * Event handler for periodic ticks

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125 if ((dev->features & CLOCK_EVT_FEAT_PERIODIC) &&
126 !tick_broadcast_oneshot_active()) {
127 clockevents_set_mode(dev, CLOCK_EVT_MODE_PERIODIC);
128 } else {
129 unsigned long seq;
130 ktime_t next;
131
132 do {
73 }
74
75 update_process_times(user_mode(get_irq_regs()));
76 profile_tick(CPU_PROFILING);
77}
78
79/*
80 * Event handler for periodic ticks

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125 if ((dev->features & CLOCK_EVT_FEAT_PERIODIC) &&
126 !tick_broadcast_oneshot_active()) {
127 clockevents_set_mode(dev, CLOCK_EVT_MODE_PERIODIC);
128 } else {
129 unsigned long seq;
130 ktime_t next;
131
132 do {
133 seq = read_seqbegin(&xtime_lock);
133 seq = read_seqbegin(&jiffies_lock);
134 next = tick_next_period;
134 next = tick_next_period;
135 } while (read_seqretry(&xtime_lock, seq));
135 } while (read_seqretry(&jiffies_lock, seq));
136
137 clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
138
139 for (;;) {
140 if (!clockevents_program_event(dev, next, false))
141 return;
142 next = ktime_add(next, tick_period);
143 }

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137 clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT);
138
139 for (;;) {
140 if (!clockevents_program_event(dev, next, false))
141 return;
142 next = ktime_add(next, tick_period);
143 }

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