RFR (S): 8204169: Humongous continues region remembered set states do not match the one from the corresponding humongous start region

[Kim Barrett]

> On Jun 4, 2018, at 6:27 AM, Thomas Schatzl <thomas.schatzl at oracle.com> wrote:
> 
> Hi all,
> 
>  can I have reviews for this small change that fixes up remembered set
> states of humongous continues regions? In particular they are not
> necessarily consistent with the humongous starts region at the moment.
> 
> This makes for some surprises when reading the logs. Otherwise there is
> no impact: all decisions on how to treat the humongous object are made
> on the humongous start region anyway.
> 
> As for testing, I added code to the heap verification to check this
> consistency requirement. This makes for a 100% failure rate in
> gc/g1/TestEagerReclaimHumongousRegionsClearMarkBits if not fixed.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8204169
> Webrev:
> http://cr.openjdk.java.net/~tschatzl/8204169/webrev/
> Testing:
> hs-tier1-3
> 
> Thanks,
>  Thomas

Looks good.