RFR: 8230109: G1DirtyCardQueueSet should use card counts rather than buffer counts

[Stefan Johansson]

> 26 aug. 2019 kl. 17:42 skrev Kim Barrett <kim.barrett at oracle.com>:
> 
>> On Aug 26, 2019, at 4:52 AM, Stefan Johansson <stefan.johansson at oracle.com> wrote:
>>> 
>>> CR:
>>> https://bugs.openjdk.java.net/browse/JDK-8230109
>>> 
>>> Webrev:
>>> http://cr.openjdk.java.net/~kbarrett/8230109/open.00/
>> 
>> I really like the cleanups you’ve done in this area of the code base and this one is no exception. Looks good, just one question around the different G1ConcRefinement-flags (threshold and zones). Couldn’t we make these be number of cards and get rid of the buffers_to_cards conversion in g1ConcurrentRefine.cpp?
> 
> Those are product options; changing their semantics like that is not so easy.
> 

True, but I think it is something we want to do in the longer run so maybe creating an enhancement for it to track it?