RFR: 8324649: Shenandoah: refactor implementation of free set [v2]

[William Kemper]

On Thu, 25 Jan 2024 21:06:17 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> Was thinking it's best to let the other N-1 worker threads get right to work on updating refs, while this first worker thread starts moving the available collector regions to mutator free set
>
> We want to put these Collector regions into the service of the Mutator threads as quickly as possible in order to avoid Mutator allocation failures.  We also want to complete update-refs as quickly as possible, because that will put a lot more memory into the hands of the Mutators.
> 
> The implementation of move_collector_sets_to_mutator() takes the heap lock when it reassigns a region's purpose from Collector to Mutator.

Okay.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17561#discussion_r1468010743