RFR: 8369286: Parallel: Assertion failure in mutableNUMASpace

[Joel Sikström]

On Tue, 7 Oct 2025 13:10:56 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Parallel will try to expand eden to satisfy allocation request. However, the current NUMA implementation in Parallel requires a space to be empty on resizing so that the memory inside the space can be freely distributed among all NUMA nodes.
> 
> Add an early-return to `PSYoungGen::try_expand_to_hold` if NUMA is enabled and eden is not empty.
> 
> Test: tier1-3

Looks good.

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Marked as reviewed by jsikstro (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27675#pullrequestreview-3310235099