State of "simplified barriers" for G1

[Gerhard Hueller]

Hi,

I remember a slide deck talking about the improvements to G1 since JDK8/9 and one bullet point on the todo-list was simplified barriers for G1.

I wonder what happened to this improvement, has it been already implemented? Is this the non-concurrent refinement option implemented by google some time ago?
Improvements in this area would be really great, CMS still provides better throughput for most workloads - with the only real advantage of G1 does offer are avoiding those degenerated STW full GCs.

Thanks, Gerhard