RFR: 8320969: Shenandoah: Enforce stable number of GC workers

[Aleksey Shipilev]

On Wed, 29 Nov 2023 11:01:32 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> See bug for rationale.
> 
> Additional testing:
>  - [x] MacOS AArch64 server fastdebug, `hotspot_gc_shenandoah`
>  - [x] Linux x86_64 server fastdebug, `tier{1,2,3}` with `-XX:+UseShenandoahGC`
>  - [x] Linux AArch64 server fastdebug, `tier{1,2,3}` with `-XX:+UseShenandoahGC`

Right, that makes sense. I'll rework the patch a bit to still allow _some_ policy adjustments without relying on shared policy.

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PR Comment: https://git.openjdk.org/jdk/pull/16878#issuecomment-1832404059