SFB_NUMBUCKETS
b += SFB_NUMBUCKETS; /* next level */
b += SFB_NUMBUCKETS; /* next level */
for (i = 0; i < SFB_LEVELS * SFB_NUMBUCKETS; i++) {
*avgpm_r = totalpm / (SFB_LEVELS * SFB_NUMBUCKETS);
#define SFB_BUCKET_MASK (SFB_NUMBUCKETS - 1)
struct sfb_bucket bins[SFB_LEVELS][SFB_NUMBUCKETS];