RFR 8149469: ByteBuffer API and implementation enhancements for VarHandles

[Paul Sandoz]

> On 18 Feb 2016, at 16:54, Paul Sandoz <paul.sandoz at oracle.com> wrote:
> I still need to think a little more about the upper bound of unitSize, i put a limit of 64 (cache line size) to stop silly values:
> 
> - implementation-wise, for non-direct buffers any value above 8 should throw a USO.
> 
> - for direct buffers is 64 too small? what about for page size alignment?
> 

I updated the webrev in place to:

1) throw a USO for non-direct buffers with unit sizes > 8, this is documented in an implementation note.

2) removed the upper limit on unit size, so for direct buffers one could choose page size as the unit size

  http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8149469-byte-buffer-align-and-unifying-enhancements/webrev/ <http://cr.openjdk.java.net/~psandoz/jdk9/JDK-8149469-byte-buffer-align-and-unifying-enhancements/webrev/>

Paul.
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