struct X {
	int                        x;                    /*     0     4 */

	/* XXX 4 bytes hole, try to pack */

	double *                   p;                    /*     8     8 */

	/* size: 16, cachelines: 1, members: 2 */
	/* sum members: 12, holes: 1, sum holes: 4 */
	/* last cacheline: 16 bytes */
};
struct Y {
	double *                   p;                    /*     0     8 */
	int                        x;                    /*     8     4 */

	/* size: 16, cachelines: 1, members: 2 */
	/* padding: 4 */
	/* last cacheline: 16 bytes */
};