DIRECT_FOOT_PAD   844 lj_alloc.c           size_t psize = mmsize - offset - DIRECT_FOOT_PAD;
DIRECT_FOOT_PAD   867 lj_alloc.c         size_t oldmmsize = oldsize + offset + DIRECT_FOOT_PAD;
DIRECT_FOOT_PAD   873 lj_alloc.c           size_t psize = newmmsize - offset - DIRECT_FOOT_PAD;
DIRECT_FOOT_PAD  1367 lj_alloc.c     	psize += prevsize + DIRECT_FOOT_PAD;