MemoryPoolMXBean 各内存池名字

MemoryPoolMXBean 是 Java 内存池的管理接口，如果要做内存监控，就会用到这个类。

下面整理下各版本内存池的名字。

Code Cache
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    Code Cache

    CodeHeap 'non-nmethods'
    CodeHeap 'profiled nmethods'
    CodeHeap 'non-profiled nmethods'

ParallelGC: PS Perm Gen

ConcMarkSweepGC: CMS Perm Gen

SerialGC: Perm Gen

    Metaspace
    Compressed Class Space

    Eden Space
    Survivor Space
    Tenured Gen

    PS Eden Space
    PS Survivor Space
    PS Old Gen

JDK9后 deprecated，JDK14后移除

    Par Eden Space
    Par Survivor Space
    CMS Old Gen

    G1 Eden Space
    G1 Survivor Space
    G1 Old Gen

    ZHeap

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