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

[Thomas Schatzl]

Hi all,

  ping! :-)

Thanks,
  Thomas

On Mon, 2018-06-04 at 12:27 +0200, Thomas Schatzl 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