RFR: 8368599: ShenandoahConcurrentMark could use ThreadsClaimTokenScope [v2]

[Albert Mingkun Yang]

On Thu, 25 Sep 2025 14:16:43 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Francesco Andreuzzi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   as field
>
> Hold on a second.
> 
> 
> class StrongRootsScope : public MarkScope {
> 
> 
> ...and:
> 
> 
> MarkScope::MarkScope() {
>   nmethod::oops_do_marking_prologue();
> }
> 
> MarkScope::~MarkScope() {
>   nmethod::oops_do_marking_epilogue();
> }
> 
> 
> So, what calls `nmethod::oops_do_marking_prologue`/`epilogue`, and do we know it is (not) needed?

@shipilev Is the above explanation enough? If so, hopefully, this PR can be merged to unblock further cleanups around `StrongRootsScope`.

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PR Comment: https://git.openjdk.org/jdk/pull/27477#issuecomment-3350610528