RFR: 8213352: Separate BufferNode allocation from PtrQueueSet

[Thomas Schatzl]

Hi,

On Sun, 2018-11-04 at 23:51 -0500, Kim Barrett wrote:
> Please review this change to PtrQueue buffer allocation, moving the
> implementation of free-list based allocation from PtrQueueSet to a
> separate BufferNode::Allocator object.  The old code supported
> sharing
> of free-lists by having one PtrQueueSet delegate to another; now
> free-list sharing is provided by using the same allocator object.
> 
> CR:
> https://bugs.openjdk.java.net/browse/JDK-8213352
> 
> Webrev:
> http://cr.openjdk.java.net/~kbarrett/8213352/open.00/
> 
> Testing:
> mach5 tier1-5
> Added gtest for new allocator class.
> 

  - copyright for the gtest should be 2018 only
  - out of curiosity, not an issue in the code, but why the need for
Atomic::load() in BufferNode::Allocator::free_count? It's okay, but I
do not see what Atomic::load provides you in this case compared to a
normal load. Is this the new preferred style to load from a volatile
variable of primitive type?

Don't need to see the new webrev for the copyright date change.

Thanks,
  Thomas