FIRST_BUCKET_SHIFT
#define FIRST_BUCKET_SIZE (1U << FIRST_BUCKET_SHIFT)
nblks = amt >> (bucket + FIRST_BUCKET_SHIFT);
onb = 1 << (i + FIRST_BUCKET_SHIFT);
totfree += j * (1 << (i + FIRST_BUCKET_SHIFT));
totused += nmalloc[i] * (1 << (i + FIRST_BUCKET_SHIFT));