tick_periodic

Name:Periodic tick

Proto:static void tick_periodic(int cpu)

Type:void

Parameter:

Type	Parameter	Name
int	cpu

85

If ick_do_timer_cpu is a timer core internal variable which holds the CPU NR* which is responsible for calling do_timer(), i == cpu Then

86

Lock out other writers and update the count.* Acts like a normal spin_lock/unlock.* Don't need preempt_disable() because that is in the spin_lock already.

89

Tick next event: keeps track of the tick time = Add two ktime_t variables. res = lhs + rhs: (Tick next event: keeps track of the tick time, tick_period)

91

Must hold jiffies_lock

92

write_sequnlock( & jiffies_lock)

93

pdate_wall_time - Uses the current clocksource to increment the wall time

96

Called from the timer interrupt handler to charge one tick to the current* process. user_tick is 1 if the tick is user time, 0 for system.

97

profile_tick(CPU_PROFILING)

**Caller**
Name	Describe
tick_handle_periodic	Event handler for periodic ticks

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