RFR(S): 8132713: Add tests which check that Humongous objects behave as expected after finishing ConcMark Cycle

[Thomas Schatzl]

Hi,

On Mi, 2016-05-11 at 13:42 +0300, Kirill Zhaldbybin wrote:
> Dear all,
> 
> Could you please review this fix for 8132713?
> 
> This fix adds two CMC scenarios to
> gc/g1/humongousObjects/objectGraphTest/TestObjectGraphAfterGC.java
> which creates different types of object graphs with Object arrays as
> nodes (to make them humongous) and checks that after different types
> GCs objects' graphs were handled correctly.
> 
> During first CMC scenario the test expects that weakly reachable
> non-humongous nodes which are not referenced by weakly reachable
> humongous nodes should be collected and other weakly reachable nodes
> should not be collected (since weakly reachable non-humongous nodes
> are in young gen and during CMC they are handled as strong roots).
> During second CMC scenario the test expects that all weakly reachable
> nodes should be collected since non-humongous nodes were previously
> promoted to old gen.
> During both scenarios softly reachable nodes should not be collected.
> 
> WebRev:
> http://cr.openjdk.java.net/~kzhaldyb/webrevs/JDK-8132713/webrev.00/
> CR: https://bugs.openjdk.java.net/browse/JDK-8132713

  Looks good.

Thomas