Moving Forward with AHS for G1

[Man Cao]

Hi all,

Thank you Thomas for creating the umbrella CR at
https://bugs.openjdk.org/browse/JDK-8353716.
While waiting a bit on SoftMaxHeapSize PR (
https://github.com/openjdk/jdk/pull/24211) to see if others have feedback,
I could start working on CurrentMaxHeapSize (
https://bugs.openjdk.org/browse/JDK-8204088).
I also agree that CurrentMaxHeapSize may not need a JEP due to its small
size and low complexity. Should it proceed similarly to how SoftMaxHeapSize
was introduced? I.e, https://bugs.openjdk.org/browse/JDK-8222145, and
creating a CSR (https://bugs.openjdk.org/browse/JDK-8222181) for it.

Separately, for removing support for Min/MaxHeapFreeRatio for G1 (mentioned
in https://bugs.openjdk.org/browse/JDK-8353716 and
https://bugs.openjdk.org/browse/JDK-8238686), how do we handle existing
users that set these two flags?
(We have very few internal users setting these two flags. But yesterday I
ran into a use case that sets -XX:MinHeapFreeRatio=0 -XX:MaxHeapFreeRatio=0
for G1...)

Best,
Man
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