perf_event__synthesize_event_update_cpus
!perf_event__synthesize_event_update_cpus(&tmp.tool, evsel, process_event_cpus));
err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
int perf_event__synthesize_event_update_cpus(const struct perf_tool *tool, struct evsel *evsel, perf_event__handler_t process);