RFR: 8368740: Serial: Swap eden and survivor spaces position in young generation [v3]

[Guoxiong Li]

On Mon, 13 Oct 2025 09:37:03 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Change the relative position of eden and survior spaces in young-gen so that eden can be expanded to fulfill allocation request in heap-near-full scenario. What is on master doesn't allow eden expansion if there is live objs inside from/to after full-gc.
>> 
>> Test: tier1-8
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'master' into sgc-expand-allocate
>  - review
>  - sgc-expand-allocate

Looks good.

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Marked as reviewed by gli (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27513#pullrequestreview-3344486294