RFR: 8254167 G1: Record regions where evacuation failed to provide targeted iteration [v4]

[Hamlin Li]

On Thu, 2 Sep 2021 13:22:12 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> Do you mean to just do some refactoring for G1EvacuationFailureRegions or for hrm/cset together?
>
> Actually, the collection set does not need the atomicity of addition to the array. So, probably it's best for this change to factor out the iteration over an array of heap region indexes into a `G1CollectedHeap`(probably the best place for now?) method which you pass the array information too - to be used in both places.
> 
> There is imho no point in delaying this into a separate CR, it's just one method and two uses afaict.

I see your point. 
Did a very simple refactoring to move the iteration from G1CollectionSet  to G1CollectedHeap, and reuse this in both G1CollectionSet  and G1EvacFailureRegions.

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PR: https://git.openjdk.java.net/jdk/pull/5272