TFA says "By mmap'ing a region and then accessing into it, the overhead of creating multitudes of small interlinked items can be reduced hugely." You do not ne

TFA says "By mmap'ing a region and then accessing into it, the overhead of creating multitudes of small interlinked items can be reduced hugely." You do not need to call mmap directly, because malloc() will do it if your allocation exceeds MMAP_THRESHOLD (usually on the order of a megabyte). So you get this optimization "for free"--the only important part is that you do not call malloc() for each tiny object.