RFR: 8309874: NMethod barriers may remain armed when regions are promoted in place [v2]

[Y. Srinivas Ramakrishna]

On Wed, 14 Jun 2023 23:16:43 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Genshen runs in-place promotions during the evacuation phase. If the cycle is _only_ performing in-place promotions, it should not arm NMethod barriers. The barriers are now only armed and disarmed if the collection set is not empty.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Describe nmethod barrier arming/disarming protocol in comments

Thanks for adding the comment!

-------------

Marked as reviewed by ysr (Reviewer).

PR Review: https://git.openjdk.org/shenandoah/pull/286#pullrequestreview-1480450362