_vmem_free
_vmem_free(slab->chunks, slab->slab_size);
_vmem_free(slab, slab->slab_size);
static void _vmem_free(void *ptr, size_t slab_size);
_vmem_free(*memptr, size);
_vmem_free(chunk, size);
_vmem_free(ptr, size);
_vmem_free(excess[i], ZoneSize);
_vmem_free(z, ZoneSize);
static void _vmem_free(void *ptr, size_t bytes);