SUPERBLOCK_FULLNESS_GROUP
for (int i = 0; i < SUPERBLOCK_FULLNESS_GROUP; i++) {
while (i < SUPERBLOCK_FULLNESS_GROUP) {
for (int i = 0; i < SUPERBLOCK_FULLNESS_GROUP; i++) {
superblock *_superblocks[SUPERBLOCK_FULLNESS_GROUP][SIZE_CLASSES];
enum { EMPTY_FRACTION = SUPERBLOCK_FULLNESS_GROUP - 1 };
enum { RESET_LEAST_EMPTY_BIN = SUPERBLOCK_FULLNESS_GROUP - 2 };
_fullness = (((SUPERBLOCK_FULLNESS_GROUP - 1)