perf_event_state
enum perf_event_state state;
enum perf_event_state parent_state = parent_event->state;
enum perf_event_state state);
enum perf_event_state state = PERF_EVENT_STATE_INACTIVE;
enum perf_event_state state = PERF_EVENT_STATE_OFF;
enum perf_event_state state)
enum perf_event_state state = READ_ONCE(event->state);
static __always_inline enum perf_event_state
enum perf_event_state state = __perf_effective_state(event);
perf_event_set_state(struct perf_event *event, enum perf_event_state state)