RFR: 8364541: Parallel: Support allocation in old generation when heap is almost full

[Albert Mingkun Yang]

On Mon, 11 Aug 2025 08:46:04 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Not sure why the condition had to be broken into two if-statements, but seems good.

The first (tlab-checking) is for correctness (old-gen can't hold tlab), while the other (size and heap-fullness) is more like heuristics.

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26599#issuecomment-3174200175