RFR: 8327000: GenShen: Integrate updated Shenandoah implementation of FreeSet into GenShen [v27]

[Kelvin Nilsen]

On Tue, 25 Jun 2024 21:38:49 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Improve consistency of OOM in GenShen mode
>>   
>>   Treat any full GC that enables a previously blocked allocation as good
>>   progress.
>
> The other side of the oom issue is test failures and timeouts caused by Shenandoah not giving up soon enough. If I recall correctly, there were three tests that would fail because they did _not_ raise an OOME when expected. Could we also run:
> 
> make test TEST="runtime/ClassInitErrors/TestOutOfMemoryDuringInit.java compiler/uncommontrap/TestDeoptOOM.java runtime/reflect/ReflectOutOfMemoryError.java" TEST_VM_OPTS="-Xlog:gc:file=/tmp/shen.log -XX:+UseShenandoahGC"
> 
> and for genshen:
> 
> make test TEST="runtime/ClassInitErrors/TestOutOfMemoryDuringInit.java compiler/uncommontrap/TestDeoptOOM.java runtime/reflect/ReflectOutOfMemoryError.java" TEST_VM_OPTS="-Xlog:gc:file=/tmp/shen.log -XX:+UseShenandoahGC -XX:ShenandoahGCMode=generational"

@earthling-amzn I've tested both command lines with REPEAT_COUNT=10 and all tests pass.  (Had to add -XX:+UnlockExperimentalVMOptions to second command)

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PR Comment: https://git.openjdk.org/shenandoah/pull/440#issuecomment-2190166092