Return barriers

[Erik Österlund]

Hello everyone,

I'm wondering if it would be possible to add return barriers to hotspot and if so if it's a good idea? Coming from a GC background I see that response times could be decreased at no performance loss. I also have a wait-free GC implementation relying on them (however not without performance loss).
Therefore, currently my implementation relies on JikesRVM since they have return barriers.

Is there any good reason why this should not be implemented in hotspot?

Regards,
Erik Österlund