perf_refcount 99 kernel/trace/trace_event_perf.c if (tp_event->perf_refcount++ > 0) perf_refcount 141 kernel/trace/trace_event_perf.c if (!--tp_event->perf_refcount) { perf_refcount 154 kernel/trace/trace_event_perf.c if (--tp_event->perf_refcount > 0) perf_refcount 2331 kernel/trace/trace_events.c if (call->perf_refcount)