RFR: 8369622: GlobalChunkPoolMutex needs to be recursive [v3]

[Coleen Phillimore]

On Thu, 16 Oct 2025 13:21:41 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> The GlobalChunkPoolMutex replaced ThreadCritical in [JDK-8356173](https://bugs.openjdk.org/browse/JDK-8356173). In NMT, we can unfortunately reach a recursive locking situation in situations when the VM is crashing and NMT attempts to perform a error report. I suggest that we make this particular mutex recursive, until we can resolve the design issues that causes this.
>> 
>> This PR also replaces the static initialization with `DeferredStatic`, and fixes the indentation of access modifiers to be consistently 0-indented.
>> 
>> Please note that we do not take the lock in NMT in order to allocate memory, but in order to have a "static picture" of the arena counters.
>
> Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Revert access modifier style

I like this last suggestion.  I'll take it over for you while on vacation.

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PR Comment: https://git.openjdk.org/jdk/pull/27759#issuecomment-3415174258