perf_event_ctx_lock

Name:perf_event_ctx_lock

Proto:static inline struct perf_event_context *perf_event_ctx_lock(struct perf_event *event)

Type:struct perf_event_context

Parameter:

Type	Parameter	Name
struct perf_event *	event

1292

Return Because of perf_event::ctx migration in sys_perf_event_open::move_group and* perf_pmu_migrate_context() we need some magic.* Those places that change perf_event::ctx will hold both* perf_event_ctx::mutex of the 'old' and 'new' ctx value.

**Caller**
Name	Describe
perf_event_disable	Strictly speaking kernel users cannot create groups and therefore this* interface does not need the perf_event_ctx_lock() magic.
perf_event_enable	See perf_event_disable();
perf_event_refresh	See perf_event_disable()
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_read_value
perf_read
perf_event_pause	Assume it's not an event with inherit set.
perf_event_period
perf_ioctl
perf_event_task_enable
perf_event_task_disable

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