RFR: 8338977: Parallel: Improve heap resizing heuristics [v3]

[Albert Mingkun Yang]

On Mon, 7 Jul 2025 00:39:20 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> but OOM and heap dump have to be, in a sense of atomic

I see; it can indeed be annoying that heap-dump doesn't capture the intended snapshot -- a java thread can trigger a gc that changes heap-content. However, AFAICS, fixing that non-atomic issue requires updating callers of `report_java_out_of_memory`. Therefore, I am inclined to think it should be addressed in its own ticket. It's a preexisting issue on master as well, not sth newly introduced by this PR.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25000#discussion_r2189268507