RFR: 8355681: G1HeapRegionManager::find_contiguous_allow_expand ignores free regions when checking regions available for allocation [v2]

[Albert Mingkun Yang]

On Thu, 1 May 2025 08:27:32 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi,
>> 
>> Please review this change to account for free regions when checking if we have enough regions to satisfy an allocation request. Currently, we have that a `_hrm.expand_and_allocate_humongous` call fails where an `expand_and_allocate` call succeeds for the same allocation request. 
>> 
>> Testing: Tier 1-3
>
> Ivan Walulya has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Albert review
>  - Merge branch 'master' into 8355681-find_contiguous_allow_expand
>  - init

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24915#pullrequestreview-2809538391