perf_env__find_br_cntr_info
perf_env__find_br_cntr_info(evsel__env(evsel), NULL, &width);
perf_env__find_br_cntr_info(evsel__env(evsel), NULL, &width);
void perf_env__find_br_cntr_info(struct perf_env *env,
perf_env__find_br_cntr_info(evsel__env(evsel), &br_cntr_nr, &br_cntr_width);