In jdk8, permanent heap is replaced with metaSpace. Some of our embedded customers had been using permanent heap with fixed size during VM lifecycle, i.e -XX:PermSize's value is set as the value of -XX:MaxPermSize. One of our customers requires that jdk8 JVM should have a new JVM option to set initial Metaspace size similar to -Xms and -XX:InitialCodeCacheSize.

    The current -XX:MetaSpaceSize is just used for controlling High-Warer Mark for GC. It is not works as the old -XX:PermSize JVM option.