RFR: 8274340: [BACKOUT] JDK-8271880: Tighten condition for excluding regions from collecting cards with cross-references

[Thomas Schatzl]

On Wed, 29 Sep 2021 12:05:33 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Hi all,
>> 
>>   please review this backout of JDK-8271880: Tighten condition for excluding regions from collecting cards with cross-references because it causes failures with Kitchensink runs.
>> 
>> As the CR indicates, with proper verification these runs fail fairly quickly after 5-20mins with a remembered set verification failure on the discovered field of some j.l.ref.References instances; without that patch multiple instances are already running for an hour without issue (out of 8h). This is enough evidence for me that the change is responsible, backing it out to keep the CI clean(er) as I do not really have an idea why at this time (another merge issue after splitting up the original change?).
>> 
>> Revert applied cleanly except for the hunk in G1PostEvacuateCollectionSetCleanupTask1::G1PostEvacuateCollectionSetCleanupTask1 line 138: an earlier cleanup moved evacuation failure handling to `G1YoungCollector`, causing some merge problems.
>> 
>> Testing: gha
>> 
>> Thanks,
>>   Thomas
>
> Marked as reviewed by ayang (Reviewer).

Thanks @albertnetymk @kimbarrett for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/5734