RFR: 8139892: Allow G1CollectorPolicy to specify if reference processing should be enabled

[Kim Barrett]

On Nov 10, 2015, at 8:05 AM, Erik Helin <erik.helin at oracle.com> wrote:
> 
> Hi all,
> 
> this patch adds the method `bool should_process_references() const` to
> G1CollectorPolicy and also updates G1CollectedHeap to make use of it.
> This enables a G1CollectorPolicy to make decisions about whether
> references should be processed or not.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8139892
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8139892/webrev.00/
> 
> Testing:
> JPRT
> 
> Thanks,
> Erik

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src/share/vm/gc/g1/g1CollectorPolicy.hpp
 738   virtual bool should_process_references() const {
 739     return true;
 740   }

Is the new behavior really strictly G1-specific?  Or should this be at
the CollectorPolicy level?

And I'm assuming some other G1 policy is going to provide a less
trivial implementation?