cpu_bufs
if (pb->cpu_bufs) {
struct perf_cpu_buf *cpu_buf = pb->cpu_bufs[i];
free(pb->cpu_bufs);
pb->cpu_bufs = calloc(pb->cpu_cnt, sizeof(*pb->cpu_bufs));
if (!pb->cpu_bufs) {
pb->cpu_bufs[j] = cpu_buf;
cpu_buf = pb->cpu_bufs[buf_idx];
cpu_buf = pb->cpu_bufs[buf_idx];
cpu_buf = pb->cpu_bufs[buf_idx];
struct perf_cpu_buf *cpu_buf = pb->cpu_bufs[i];
struct perf_cpu_buf **cpu_bufs;