perf_counts__new
evsel->counts = perf_counts__new(perf_cpu_map__nr(cpus), nthreads);
struct perf_counts *perf_counts__new(int ncpus, int nthreads);
evsel->counts = perf_counts__new(ncpus, nthreads);
evsel->prev_raw_counts = perf_counts__new(ncpus, nthreads);
counts = perf_counts__new(cpu_map_nr, nthreads);