int unit_get_memory_current(Unit *u, uint64_t *ret);
int unit_get_memory_peak(Unit *u, uint64_t *ret);
+int unit_get_memory_swap_current(Unit *u, uint64_t *ret);
int unit_get_memory_swap_peak(Unit *u, uint64_t *ret);
int unit_get_memory_available(Unit *u, uint64_t *ret);
int unit_get_tasks_current(Unit *u, uint64_t *ret);