RFR: 8143847: Remove REF_CLEANER reference category

[Jesper Wilhelmsson]

Den 11/1/16 kl. 06:51, skrev Kim Barrett:
> On Jan 8, 2016, at 3:04 PM, Jesper Wilhelmsson <jesper.wilhelmsson at oracle.com> wrote:
>>
>> Looks good!
>>
>> Since you change vmStructs.cpp it's a good idea to run some SA test just to make sure there is no use of the deleted field in there. There's a bunch of jtreg tests in hotspot/test/serviceability/sa/. Last time I checked these were not run by jprt.
>
> Oh, you are right, jprt doesn't run the SA tests.  I ran all the
> servicability tests locally with no problems.
>
>> Slightly unrelated: Is it worth to make number_of_subclasses_of_ref() slightly more robust by adding a "REF_LAST" or similar to use in there? I guess we don't intend to add more reference types, but it is easy to forget to update this method if a new type is added last in the enum.
>
> I was going to say "sure", but then looked at the code more carefully,
> and think I'd rather not, at least not as part of this change.
>
> number_of_subclasses_of_ref not only knows about REF_PHANTOM (was
> REF_CLEANER) being the last, but it also knows about REF_OTHER.  I'm
> inclined to think REF_OTHER is a mistake, and should be removed.  I'd
> be happy to add a "last reference type" constant as part of such a
> change.  But my preference would be to not add any of that to the
> current change, which is about backing out REF_CLEANER.
>

Sounds good.
Ship it!
/Jesper