RFR (XL): 8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data

Jesper Wilhelmsson jesper.wilhelmsson at oracle.com
Wed Aug 13 15:01:24 UTC 2014

Looks good.

You made changes in vmStructs_g1.hpp. Did you verify that this didn't trigger 
any changes in the serviceability agent?

Thomas Schatzl skrev 12/8/14 17:09:
> Hi all,
>    can I have reviews for this somewhat large refactoring change? It is
> about refactoring the HeapRegionSeq class to manage heap region and
> auxiliary data.
> I.e. currently HeapRegionSeq only manages the HeapRegion instances
> corresponding to the heap's region. The change gives HeapRegionSeq more
> responsibilities, encapsulating functionality related to heap memory
> management. This decreases the amount of responsibilities (and
> complexity) for the G1CollectedHeap class: decisions about how heap
> related memory is allocated/freed/iterated (i.e. how the heap regions
> are actually allocated in the heap) is removed from G1CollectedHeap.
> This change only changes the interface to this functionality. It is a
> preparatory change for JDK-8038423 "G1: Decommit memory within the
> heap", so the change might be slightly more extensive than really
> required.
> The RFR for JDK-8038423 will follow to look at it in context.
> There is another CR that renames HeapRegionSeq to HeapRegionmanager too.
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8054818
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8054818/webrev/
> Testing:
> jprt, nightly and bigapps (kitchensink, ...) with -XX:+UseG1GC
> Thanks,
>    Thomas

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