RFR: 8307058: Implementation of Generational ZGC [v2]

[Stefan Karlsson]

On Wed, 3 May 2023 21:08:39 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> test/jdk/ProblemList-generational-zgc.txt line 27:
>> 
>>> 25: #
>>> 26: # List of quarantined tests for testing with Generational ZGC.
>>> 27: #
>> 
>> Are the tests in `test/jdk/sun/tools/jhsdb/` not failing?
>
> It seems like these tests are only run with all GCs at the end of the development cycle. I've run them manually and verified that these tests fail as well. I'm going to problem list them.
> 
> That run also revealed that jstat doesn't like when we report the initial capacity of the old generation as zero. See the calculation in:
> src/jdk.jcmd/share/classes/sun/tools/jstat/resources/jstat_options
> 
>   column {
>     header "^O^"        /* Old Space - Percent Used */
>     data (1-((sun.gc.generation.1.space.0.capacity - sun.gc.generation.1.space.0.used)/sun.gc.generation.1.space.0.capacity)) * 100
>     align right
>     scale raw
>     width 6
>     format "0.00"
>   }
> 
> 
> I can work around the test problem by faking the capacity to be non-zero, but that's not a pretty solution IMO.

The jhsdb tests have been ProblemListed. The jstat test is going to be fixed with #13796.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13771#discussion_r1184781772