eventfd_signal

Name:ventfd_signal - Adds @n to the eventfd counter

Proto:__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n)

Type:__u64

Parameter:

Type	Parameter	Name
struct eventfd_ctx *	ctx
__u64	n

73

If WARN_ON_ONCE(Operations with implied preemption/interrupt protection. These* operations can be used without worrying about preemption or interrupt.(eventfd_wake_count)) Then Return 0

76

spin_lock_irqsave( & lock, flags)

77

this_cpu_inc(eventfd_wake_count)

78

If ULLONG_MAX - * Every time that a write(2) is performed on an eventfd, the * value of the __u64 being written is added to "count" and a * wakeup is performed on "wqh". A read(2) will return the "count" * value to userspace, and will reset "count" to zero. The kernel * s < n Then n = ULLONG_MAX - * Every time that a write(2) is performed on an eventfd, the * value of the __u64 being written is added to "count" and a * wakeup is performed on "wqh". A read(2) will return the "count" * value to userspace, and will reset "count" to zero. The kernel * s

80

* Every time that a write(2) is performed on an eventfd, the * value of the __u64 being written is added to "count" and a * wakeup is performed on "wqh". A read(2) will return the "count" * value to userspace, and will reset "count" to zero. The kernel * s += n

81

If waitqueue_active -- locklessly test for waiters on the queue*@wq_head: the waitqueue to test for waiters* returns true if the wait list is not empty* NOTE: this function is lockless and requires care, incorrect usage _will_ Then wake_up_locked_poll( & wqh, Epoll event masks )

83

this_cpu_dec(eventfd_wake_count)

84

spin_unlock_irqrestore( & lock, flags)

86

Return n

**Caller**
Name	Describe
__mem_cgroup_threshold
mem_cgroup_oom_notify_cb
mem_cgroup_oom_register_event
memcg_event_remove	Unregister event and free resources.* Gets called from workqueue.
vmpressure_event
aio_complete	aio_complete* Called when the io request on the given iocb is complete.
__io_cqring_ev_posted
io_poll_trigger_evfd

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