rcu_sched_clock

Name:Check to see if the scheduling-clock interrupt came from an extended* quiescent state, and, if so, tell RCU about it. This function must* be called from hardirq context. It is normally called from the* scheduling-clock interrupt.

Proto:void rcu_sched_clock_irq(int user)

Type:void

Parameter:

Type	Parameter	Name
int	user

If user Then

Note a quiescent state for PREEMPT=n. Because we do not need to know* how many quiescent states passed, just if there was at least one since* the start of the grace period, this just sets a flag. The caller must* have disabled preemption.

Else if ->next pointer of last "done" CB. != ->next pointer of last CB. Then

set_tsk_need_resched(current process)

We fold the NEED_RESCHED bit into the preempt count such that* preempt_enable() can decrement and test for needing to reschedule with a* single instruction.* We invert the actual bit, so that when the decrement hits 0 we know we both

**Caller**
Name	Describe
update_process_times	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.

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Function report