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。

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.

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程序对堆、非堆、永久保存区（Permanent Generation），以及JVM包含的不同内存池（新生对象区、长期对象区、存活空间等）的内存使用情况

The Memory usage for the applications Heap, Non Heap, Permanent Generation and the different memory pools that the JVM has (new generation, tenured generation, survivor space, etc.)

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