[aarch64-port-dev ] RFR: Bulk integration of Shenandoah 2018-05-15

[Aleksey Shipilev]

On 05/17/2018 07:41 PM, Andrew Haley wrote:
> That looks reasonable.

Have you reviewed the entire patch already? Oh wow, that was fast! I suspected it would take a full
day to read through them.

> Is there a well-defined process for handling changes as the GC
> interface progresses in upstream trunk?  Is it a matter of
> back-porting the GC interface to JDK 8, or do you still do things the
> "old" way?

We are trying our best not to touch the shared parts in backports, preferring to be slightly less
performance efficient with the benefits for our own development sanity. Backporting the JDK 10+ GC
interface to JDK 8 would be an insane endeavor.

So, sh/jdk8, sh/jdk9, sh/jdk10, sh/jdk all touch the runtime in slightly different ways, but not
frustratingly different. Most of the barrier logic is encapsulated in ShenandoahBarrierSet and
friends. The actual calls around the runtime are one-liner differences.

Thanks,
-Aleksey