allocator_stats
void get_allocator_stats(struct allocator_struct *x, struct allocator_stats *s)
extern void get_allocator_stats(struct allocator_struct *, struct allocator_stats *);
extern void get_##x##_stats(struct allocator_stats *); \
void get_##x##_stats(struct allocator_stats *s) \
static void show_stats(get_t get, struct allocator_stats * tot)
struct allocator_stats x;
struct allocator_stats tot = { .name = "total", };
typedef void (*get_t)(struct allocator_stats*);