Card marking algorithms can add as little as two or three machine instructions per non-initializing heap pointer store, and entails scanning any objects on dirty cards at minor collection time.

• 对每一个非初始化堆指针存储,卡片标记算法可以只增加两到三个机器指令,并要求在小的收集时对所有脏卡片上的对象进行扫描。