RFR: 8343658: Parallel: Implement block_start for Young generation

[Albert Mingkun Yang]

On Wed, 6 Nov 2024 14:14:14 GMT, Volker Simonis <simonis at openjdk.org> wrote:

> this will not work in the general case, if the heap is not walkable.

True, but this is the best-effort approach used in other GCs, as far as I can tell. Is there a real use case that warrants a more sophisticated variant?

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PR Review Comment: https://git.openjdk.org/jdk/pull/21919#discussion_r1831500873