RFR: 8296796: Provide clean, platform-agnostic interface to C-heap trimming

[Thomas Stuefe]

On Mon, 14 Nov 2022 01:35:35 GMT, David Holmes <dholmes at openjdk.org> wrote:

> This looks good for doing what it says, but I have to wonder whether it is actually worthwhile doing this unless most OS/lib will support it? What will the implementation be in AIX?

I think C-Heap trimming is useful even if only Linux does it. Linux is arguably the most important platform. And https://github.com/openjdk/jdk/pull/10085 would bring demonstratable benefits but did not garner a lot of interest. So I hope to speed it up by splitting parts that are hopefully non-contentious into separate RFEs.

I know that AIX has an API to disclaim memory, but have not yet looked deeply into the integration. I also cannot rule out that other platforms may give us similar APIs in the future.

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PR: https://git.openjdk.org/jdk/pull/11089