Function report |
Source Code:kernel\events\core.c |
Create Date:2022-07-28 13:41:23 |
Last Modify:2022-05-20 07:50:19 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
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 |
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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.) |
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:) |
11990 | perf_free_event(event, ctx) |
12008 | wait_var_event( & refcount, _read - get a refcount's value*@r: the refcount* Return: the refcount's value == 1) |
Name | Describe |
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perf_event_init_task | Initialize the perf_event context in task_struct |
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