RFR: 8240745: Implementation: JEP 377: ZGC: A Scalable Low-Latency Garbage Collector (Production)

[Erik Gahlin]

Hi Per,

I couldn’t see any unit tests for the JFR events. All supported events should have that. 

I also wonder about the ZStatisticsCounter event. JFR events should provide metadata (label, name, units etc) describing values. Either refactor it into well-formed events, or keep the event experimental.

Thanks
Erik

> On 27 Mar 2020, at 15:30, Per Liden <per.liden at oracle.com> wrote:
> 
> Please review the patch for JEP 377: ZGC: A Scalable Low-Latency Garbage Collector (Production).
> 
> This patch changes the UseZGC option, some of the ZGC-specific options, as well as some of the ZGC-specific JFR events from experimental to product. It also adjusts tests using ZGC to not supply -XX:+UnlockExperimentalVMOptions.
> 
> Note that this patch builds on JDK-8241361, which as of this writing, has not yet been pushed.
> 
> JEP: https://openjdk.java.net/jeps/377
> Bug: https://bugs.openjdk.java.net/browse/JDK-8240745
> Webrev: http://cr.openjdk.java.net/~pliden/8240745/webrev.0
> 
> Testing: Passed tier 1-7 on all platforms.
> 
> /Per