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

JDK7, JDK8

    Code Cache

JDK9 后

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

Perm Gen

JDK7

ParallelGC: PS Perm Gen

ConcMarkSweepGC: CMS Perm Gen

SerialGC: Perm Gen

Metaspace

JDK8 之后

    Metaspace
    Compressed Class Space

SerialGC

    Eden Space
    Survivor Space
    Tenured Gen

ParallelGC + ParallelOldGC

    PS Eden Space
    PS Survivor Space
    PS Old Gen

ConcMarkSweepGC + ParNewGC

JDK9后 deprecated，JDK14后移除

    Par Eden Space
    Par Survivor Space
    CMS Old Gen

G1GC

    G1 Eden Space
    G1 Survivor Space
    G1 Old Gen

ZGC

    ZHeap