RFR: 8198515: Extract SoftReferencePolicy code out of CollectorPolicy

[Stefan Karlsson]

Hi all,

Updated webrevs:
  http://cr.openjdk.java.net/~stefank/8198515/webrev.02.delta/
  http://cr.openjdk.java.net/~stefank/8198515/webrev.02/

I realized that I could get rid of the set_size_policy code by simply 
fetching the size_policy() from the GenCollectedHeap. That way, I don't 
add any behavioral changes to this patch.

I also added _soft_ref_gen_policy to the initializer list.

Thanks,
StefanK

On 2018-02-21 18:59, Stefan Karlsson wrote:
> Hi all,
>
> Please review this patch to move code related to SoftReference 
> handling out from CollectorPolicy into its own classes and files.
>
>  http://cr.openjdk.java.net/~stefank/8198515/webrev.01/
>  https://bugs.openjdk.java.net/browse/JDK-8198515
>
> This patch simply reduces the code in CollectorPolicy, as a step 
> towards JDK-8198505. There might be some future cleanups that could be 
> done here in the future.
>
> Note the addition in genCollectedHeap.cpp:
> +  // Connect the two policies.
> + _soft_ref_gen_policy.set_size_policy(_gen_policy->size_policy());
>
> There might be possible to straighten up this code, so that the 
> size_policy gets set up earlier, before the SoftRefGenPolicy instance. 
> If/when that happens, we could set this field in the constructor and 
> get rid of this line.
>
> Thanks,
> StefanK