RFR: 8201826: G1: Don't invoke WeakProcessor if mark stack has overflowed

[Kim Barrett]

> On Apr 19, 2018, at 3:12 AM, Stefan Karlsson <stefan.karlsson at oracle.com> wrote:
> 
> Looks good.
> 
> StefanK

Thanks.

> On 2018-04-19 06:56, Kim Barrett wrote:
>> Please review this change to G1 concurrent marking to not invoke the
>> WeakProcessor when the mark stack has overflowed, as the is-alive
>> closure is not accurate in that situation.
>> CR:
>> https://bugs.openjdk.java.net/browse/JDK-8201826
>> Webrev:
>> http://cr.openjdk.java.net/~kbarrett/8201826/open.00/
>> Testing:
>> {jdk,hs}-tier{1,2,3} on all Oracle supported platforms.