> 8-byte mallocs are expensive because most mallocs have per-allocation memory overhead to track things As you say, most mallocs have this overhead. But with a

> 8-byte mallocs are expensive because most mallocs have per-allocation memory overhead to track things As you say, most mallocs have this overhead. But with a bit of alignment trickery and bit masking you can put the header storage at the start of a page, bringing per-allocation overhead down to just a few bits.