free_event

函数名称：Used to free events which have a known refcount of 1, such as in error paths* where the event isn't exposed yet and inherited events.

函数原型：static void free_event(struct perf_event *event)

返回类型：void

参数：

类型	参数	名称
struct perf_event *	event

4644

如果WARN(atomic_long_cmpxchg( & refcount, 1, 0) != 1, "unexpected event refcount: %ld; ptr=%p\n", atomic_long_read( & refcount), event)则

**调用者**
名称	描述
perf_event_release_kernel	Kill an event dead; while event:refcount will preserve the event* object, it will not preserve its functionality. Once the last 'user'* gives up the object, we'll destroy the thing.
perf_event_create_kernel_counter	perf_event_create_kernel_counter@attr: attributes of the counter to create@cpu: cpu in which the counter is bound*@task: task to profile (NULL for percpu)
perf_event_exit_event
perf_free_event
inherit_event	Inherit an event from parent task to child task.* Returns:* - valid pointer on success* - NULL for orphaned events* - IS_ERR() on error

函数逻辑报告