RFR: 8264818: G1: Improve liveness check for empty pinned regions after full gc marking

Thu Apr 15 07:46:37 UTC 2021

On Wed, 14 Apr 2021 08:40:56 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this small change improving the check for empty Open Archive regions using information that has recently been added to the full gc in [JDK-8263495](https://bugs.openjdk.java.net/browse/JDK-8263495) instead of scanning the region?
>> 
>> Testing: tier1-3, manual check that the freeing still works using some hack to create a dummy Open Archive region which contents are completely unreferenced and then running a "Hello World" app doing a system.gc. The patch for the VM to create that archive is [here](https://github.com/openjdk/jdk/commit/47d740d244b09b104df635c07ee49f89f480ebc6).
>
> Looks good.

Thanks @kstefanj @Hamlin-Li @albertnetymk for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/3485