RFR: 8234768: Shenandoah: Streamline enqueueing runtime barriers

Roman Kennke rkennke at redhat.com
Tue Nov 26 13:48:19 UTC 2019

Shenandoah's runtime barriers for SATB pre-date the GC interface, and
have been very coarsly fitted into the new GC interfaces. It leaves room
for improvements:
- Rename methods to make more sense
- Group enqueueing barrier methods together
- Make them inlinable, including the ultimate enqueue() method
- Avoid barriers on DEST_UNINITIALIZED pre-barriers
- Benefit from static resolution of decorators when possible, and don't
generate barriers at all in those cases

As a bonus, add SATB and traversal store-value barriers to native oop
stores. This is not doing anything now, but will enable concurrent roots
scanning in the near future.


Can I please get a review?


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