RFR(S) 8154467: Cleanup initialization of GCPolicyCounters

[Erik Helin]

On 2016-04-20, Mikael Gerdin wrote:
> Hi all,
> 
> Please review this small cleanup to how GCPolicyCounters are initialized and
> managed.
> 
> GCPolicyCounters* counters() is part of the CollectorPolicy API but in fact
> it is not necessary to expose it at such a general level.
> G1 has only used the object internally in the policy code and managing the
> policy counters object can be safely moved inside the G1Policy.
> 
> ParalellGC has ignored initializing the field in the CollectorPolicy at
> all, since it does not really use the CollectorPolicy API.
> 
> The Gen collectors can be adapted to access the counters() accessor through
> the GenCollectorPolicy class instead.
> 
> Testing: RBT GC Testing
> Webrev: http://cr.openjdk.java.net/~mgerdin/8154467/webrev.0/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8154467

Nice cleanup. Could you make
GenCollectorPolicy::initialize_gc_policy_counters pure virtual and let
the implementors of GenCollectorPolicy decide if they want to call
ShouldNotReachHere in their implementation?

Thanks,
Erik

> /Mikael