[backport][multiTenant] support multi-tenant Heap throtting

[yiiqian]

基于tag:dragonwell-extended-11.0.18.14_jdk-11.0.18-ga版本
backport dragonwell8多租户内存隔离相关代码，并完成对dragonwell11的兼容，包括模块化、并行化fullgc的兼容

[CLAassistant]

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4 out of 13 committers have signed the CLA.

✅ zhengxiaolinX
✅ yuleil
✅ lingjun-cg
✅ kuaiwei
❌ Andrew Haley
❌ gnu-andrew
❌ RealCLanger
❌ Accelerator1996
❌ martinuy
❌ jerboaa
❌ GoeLin
❌ shipilev
❌ rgithubli

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[lingjun-cg]

租户的特性随着现在容器化技术的普遍,使用的场景较少,基于此考虑Dragonwell 11不再支持租户的特性。
如果有相关的需求,是否可以将需求详细的描述一下，看是否有其它的替代方案可以解决?

[yiiqian]

租户的特性随着现在容器化技术的普遍,使用的场景较少,基于此考虑Dragonwell 11不再支持租户的特性。 如果有相关的需求,是否可以将需求详细的描述一下，看是否有其它的替代方案可以解决?

感谢回复。之前了解到dragonwell8多租户特性会用于热部署，对类资源进行隔离和切换。目前dragonwell11通过什么技术支持热部署的

[lingjun-cg]

Dragonwell 11相对Dragonwell 8在热部署方面没有太大变化，提供了Redefine class的能力： https://docs.oracle.com/javase/8/docs/technotes/guides/jpda/enhancements1.4.html。

有了上面的Redefine的能力以后，三方框架就可以基于此来使热部署更易为使用，如https://hotswapagent.org/
和https://www.jrebel.com/products/jrebel 。

总结一下即Dragonwell提供了Refine class的能力，但是借助第三方框架的让热部署更易于使用。