[13u] RFR: 8230565: ZGC: Redesign C2 load barrier to expand on the MachNode level

[Erik Österlund]

Hi Per,

Looks good.

Thanks,
/Erik

On måndag 14 oktober 2019 kl. 23:43:16 CEST Per Liden wrote:
> Hi,
> 
> Please review this back port of JDK-8230565 to 13u. This fix
> significantly improves stability of ZGC (or more specifically ZGC's C2
> load barrier). The back port was trivial, but not completely clean, as
> it required manual merge to resolve 4 simple conflicts.
> 
> Original bug: https://bugs.openjdk.java.net/browse/JDK-8230565
> Original commit: https://hg.openjdk.java.net/jdk/jdk/rev/d376d86b0a01
> 
> JDK 13u webrev: http://cr.openjdk.java.net/~pliden/8230565/webrev.jdk13u
> 
> Testing:
> - Tier1-3 on all Oracle platforms.
> - Tier1-6 on Linux/x64.
> - Multiple iterations of gc-test-suite on Linux/x64.
> - Builds on Linux/AArch64.
> 
> /Per