RFR [9]: Purge partial GC and matrix code

[Roman Kennke]

Am 16.10.2017 um 13:20 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/purge-partial-9/webrev.01/
>
> sh/jdk8u does not have partial and matrix code. sh/jdk9 has STW partial and matrix code. sh/jdk10
> has concurrent partial and matrix code. The backports from sh/jdk10 to sh/jdk9 are now very
> complicated, because they require touching shared code in 9 to fit the changes in barriers (e.g.
> keep_alive_barrier).
>
> Knowing that sh/jdk9 is our backport repository, and the roadmap for JDK release cadence that
> probably skips lots of sh/jdk9 deployments, and that partial is the experimental feature, I propose
> we purge the partial and matrix code from sh/jdk9. This cuts down the backporting and support work
> significantly, and keeps our intrusive experimental features contained in sh/jdk10.
>
> Thoughts?

That sounds right. jdk9 and 8u should be more or less the same.

Ok from me.

Roman