RFR: 8358483: G1: Remove G1HeapRegionManager::num_available_regions

[Ivan Walulya]

On Tue, 10 Jun 2025 13:14:16 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> In general though, I think we should not expose G1HeapRegionManager to other classes via the suggested hrm() getter because imo the region management (getting information about them, iteration) seems to be fairly central to the heap. G1HeapRegionManagerto me is an integral part of the CollectedHeap, and only factored out into an extra class for convenience.

If this is the general approach, then it is fine by me.

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PR Comment: https://git.openjdk.org/jdk/pull/25611#issuecomment-2959538317