RFR: 8269870: PS: Membar in PSPromotionManager::copy_unmarked_to_survivor_space could be relaxed [v3]

[Thomas Schatzl]

On Wed, 26 Jun 2024 05:42:23 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> The acquire-release mem-barrier was probably used/required before but not any more. Inspiration taken from `G1ParScanThreadState::do_oop_evac`.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Lgtm.

Fwiw, now that it is established that nobody is looking at the object's contents, PR#17227 can be resurrected too.

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Marked as reviewed by tschatzl (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19764#pullrequestreview-2140992067