RFR: 8371260: Improve scaling of downcalls using MemorySegments allocated with shared arenas.

[Stuart Monteith]

On Mon, 1 Dec 2025 13:13:13 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> Can you confirm that you aren't planning to try to try to integrate this before the fork for JDK 26 this week? There are several discussion points, and some of the changes are in risky areas, will likely need back time in main line.

I am not planning, and wouldn't want to integrate this just before a fork. While I've checked it the best I can, I'd appreciate some scrutiny.

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PR Comment: https://git.openjdk.org/jdk/pull/28575#issuecomment-3596636408