kernel/events/core.c

2221 static void sync_child_event(struct perf_event *child_event);
13024 static void sync_child_event(struct perf_event *child_event)
13026 	struct perf_event *parent_event = child_event->parent;
13029 	if (child_event->attr.inherit_stat) {
13030 		struct task_struct *task = child_event->ctx->task;
13033 			perf_event_read_event(child_event, task);
13036 	child_val = perf_event_count(child_event);
13042 	atomic64_add(child_event->total_time_enabled,
13044 	atomic64_add(child_event->total_time_running,
13101 	struct perf_event *child_event, *next;
13151 	list_for_each_entry_safe(child_event, next, &child_ctx->event_list, event_entry)
13152 		perf_event_exit_event(child_event, child_ctx);
13321 	struct perf_event *child_event;
13333 	child_event = perf_event_alloc(&parent_event->attr,
13338 	if (IS_ERR(child_event))
13339 		return child_event;
13341 	pmu_ctx = find_get_pmu_context(child_event->pmu, child_ctx, child_event);
13343 		free_event(child_event);
13346 	child_event->pmu_ctx = pmu_ctx;
13359 		free_event(child_event);
13371 		child_event->state = PERF_EVENT_STATE_INACTIVE;
13373 		child_event->state = PERF_EVENT_STATE_OFF;
13377 		struct hw_perf_event *hwc = &child_event->hw;
13385 	child_event->ctx = child_ctx;
13386 	child_event->overflow_handler = parent_event->overflow_handler;
13387 	child_event->overflow_handler_context
13393 	perf_event__header_size(child_event);
13394 	perf_event__id_header_size(child_event);
13400 	add_event_to_ctx(child_event, child_ctx);
13401 	child_event->attach_state |= PERF_ATTACH_CHILD;
13407 	list_add_tail(&child_event->child_list, &parent_event->child_list);
13410 	return child_event;