perf_pmu__file_exists
return perf_pmu__file_exists(pmu, pmu_path);
has_sysfs_event = perf_pmu__file_exists(pmu, event_file_name);
has_sysfs_event = perf_pmu__file_exists(pmu, event_file_name);
bool perf_pmu__file_exists(const struct perf_pmu *pmu, const char *name);