RFR: 8079080: ConcurrentMark::mark_stack_push(oop) is unused

[Thomas Schatzl]

Hi Kim,

On Wed, 2015-04-29 at 19:42 -0400, Kim Barrett wrote:
> Please review this cleanup of ConcurrentMark and CMMarkStack.
> 
> The following functions were unused, so are being removed:
> 
> - ConcurrentMark::mark_stack_push(oop) - the other overload is used and retained.
> - CMMarkStack::push(oop)
> - CMMarkStack::par_push(oop)
> - CMMarkStack::par_adjoin_arr(oop*, int)
> 
> In addition, CMMarkStack::pop() is only used in the implementation of
> CMMarkStack::drain(), so is being made private.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8079080
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8079080/webrev.00/
> 

 while cleaning up there, could you also remove the following places:

- "friend class CMGlobalObjectClosure" - there is no
CMGlobalObjectClosure class

- CMMarkStack::_max_stack can be removed. While the member is updated in
non-product builds, the value is never used anywhere.

- CMMarkStack::isFull() is not referenced

- maybe in the declaration of ConcurrentMark::_remark_mark_times and
ConcurrentMark::_remark_weak_ref_times the extra space could be removed.

Thanks,
  Thomas