psi_schedule_poll

函数名称：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.

函数原型：static void psi_schedule_poll_work(struct psi_group *group, unsigned long delay)

返回类型：void

参数：

类型	参数	名称
struct psi_group *	group
unsigned long	delay

561

如果atomic_cmpxchg( & poll_scheduled, 0, 1)不等于0则返回

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等于cu_dereference() - fetch RCU-protected pointer for dereferencing*@p: The pointer to read, prior to dereferencing* This is a simple wrapper around rcu_dereference_check().(poll_kworker)

571

如果此条件成立可能性大(为编译器优化)(kworker)则kthread_queue_delayed_work - queue the associated kthread work* after a delay

573

否则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()

**调用者**
名称	描述
psi_poll_work
psi_task_change

源代码转换工具开放的插件接口	X
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