perf_event_free_task

Name:Free a context as created by inheritance by perf_event_init_task() below,* used by fork() in case of fail.* Even though the task has never lived, the context and events have been* exposed through the child_list, so we must take care tearing it all down.

Proto:void perf_event_free_task(struct task_struct *task)

Type:void

Parameter:

Type	Parameter	Name
struct task_struct *	task

11972

ctx = perf_event_ctxp[ctxn]

11973

If Not ctx Then Continue

11976

mutex_lock( & Protect the list of events. Locking either mutex or lock* is sufficient to ensure the list doesn't change; to change* the list you need to lock both the mutex and the spinlock.)

11977

raw_spin_lock_irq( & Protect the states of the events in the list,* nr_active, and the list:)

11984

RCU_INIT_POINTER() - initialize an RCU protected pointer*@p: The pointer to be initialized.*@v: The value to initialized the pointer to.* Initialize an RCU-protected pointer in special cases where readers(perf_event_ctxp[ctxn], NULL)

11985

WRITE_ONCE(task, TASK_TOMBSTONE)

11986

put_task_struct(task)

11987

raw_spin_unlock_irq( & Protect the states of the events in the list,* nr_active, and the list:)

11989

list_for_each_entry_safe - iterate over list of given type safe against removal of list entry*@pos: the type * to use as a loop cursor.*@n: another type * to use as temporary storage*@head: the head for your list.(event, tmp, & event_list, event_entry)

11990

perf_free_event(event, ctx)

11992

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

12008

wait_var_event( & refcount, _read - get a refcount's value*@r: the refcount* Return: the refcount's value == 1)

12009

**Caller**
Name	Describe
perf_event_init_task	Initialize the perf_event context in task_struct

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