RFR: 8369420: Parallel: Using multiple workers for class unloading

[Francesco Andreuzzi]

On Wed, 8 Oct 2025 10:58:59 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Support parallel class unloading in ParallelGC. Much inspiration taken from `G1ParallelCleaningTask`.
> 
> Test: tier1-5

src/hotspot/share/gc/parallel/psParallelCompact.cpp line 1167:

> 1165: 
> 1166: public:
> 1167:   PSParallelCleaningTask(uint num_workers,

Is `num_workers` used somewhere?

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PR Review Comment: https://git.openjdk.org/jdk/pull/27689#discussion_r2413729656