BUCKETS
struct chunk_head chunk_info_list[BUCKETS + 1];
struct chunk_head chunk_dir[BUCKETS + 1][MALLOC_CHUNK_LISTS];
for (i = 0; i <= BUCKETS; i++) {
for (i = 0; i <= BUCKETS; i++) {
struct circq timeout_wheel[BUCKETS]; /* [T] Tick-based timeouts */
struct circq timeout_wheel_kc[BUCKETS]; /* [T] Clock-based timeouts */