RFR: JDK-8262068: Improve G1 Full GC by skipping compaction for regions with high survival ratio

[Hamlin Li]

On Fri, 5 Mar 2021 08:41:58 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Hi Stefan,
>> 
>> There is jdk/tier1 test failure on MaxOS, it passed on other platforms: https://github.com/openjdk/jdk/pull/2760/checks?check_run_id=2033359984. 
>> Rerun passed: https://github.com/Hamlin-Li/jdk/actions/runs/622899539
>
> Even if the re-run passes this seems to be a real problem, probably just a bit intermittent. Looking at the test output you can see there is a segmentation fault in:
> `G1FullGCPrepareTask::G1CalculatePointersClosure::prepare_for_skipping_compaction(...)`
> 
> Running the test with debug builds might make the issue reproduce on more platforms and give hints on what the problem is.
> 
> Hope this helps,
> Stefan

Thanks Stefan, we're investigating. (currently, we don't have mac env)
BTW, before it's reproduced locally, is there any way to get more information from the online test result? I can only find the "View raw logs".

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PR: https://git.openjdk.java.net/jdk/pull/2760