psi_schedule_poll

Name:Schedule polling if it's not already scheduled. It's safe to call even from* hotpath because even though kthread_queue_delayed_work takes worker->lock* spinlock that spinlock is never contended due to poll_scheduled atomic* preventing such competition.

Proto:static void psi_schedule_poll_work(struct psi_group *group, unsigned long delay)

Type:void

Parameter:

Type	Parameter	Name
struct psi_group *	group
unsigned long	delay

561

If atomic_cmpxchg( & poll_scheduled, 0, 1) != 0 Then Return

564

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

566

kworker = fetch RCU-protected pointer for dereferencing(poll_kworker)

571

If Value is more likely to compile time(kworker) Then kthread_queue_delayed_work - queue the associated kthread work* after a delay

573

Else atomic_set( & poll_scheduled, 0)

576

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

**Caller**
Name	Describe
psi_poll_work
psi_task_change

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Function report