RFR [8u] 8165489 (S): Missing G1 barrier in Unsafe_GetObjectVolatile

[Thomas Schatzl]

Hi,

On Wed, 2018-04-25 at 12:34 +0200, Aleksey Shipilev wrote:
> (trying again on hotspot-dev@)
> 
> Hi,
> 
> Please review this this backport/fix for 8u. This improves G1
> stability in 8u, and provides the base
> for Shenandoah JDK 8 backport that piggybacks on G1 pre-barriers. The
> fix does not apply cleanly,
> because there is also Unsafe_GetObject140 that needs fixing too.
> 
> JDK 9 bug:
>   https://bugs.openjdk.java.net/browse/JDK-8165489
> 
> JDK 9 fix:
>   http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/a696583f5ddb
> 
> JDK 8u fix:
>   http://cr.openjdk.java.net/~shade/8165489-8u/webrev.01/
> 
> Testing: x86_64 build, Shenandoah tests

  I think this is good. Let me run it through jprt, I will report back
later.

Thomas