RFR (XS) 8076759: AbstractStringBuilder.append(...) should ensure enough capacity for the upcoming "trivial" append calls

[Aleksey Shipilev]

Hi Roger,

On 05/01/2015 08:19 PM, Roger Riggs wrote:
> Is there any additional benefit by rounding up the next multiple of 4 or 8.
> That would avoid a few wasted bytes at the end of the buffer modulo the
> allocation size.

It does not seem to help any further. Tried "plus32-round8", as in:
  http://cr.openjdk.java.net/~shade/8076759/patches.txt

...and it performs similar to "plus32":
  http://cr.openjdk.java.net/~shade/8076759/data-foot.png
  http://cr.openjdk.java.net/~shade/8076759/data-perf.png

> Otherwise, looks fine to me also.

I actually wonder if my change in ensureCapacity Javadoc requires a CCC?
On that topic, I also tempted to remove the implementation details from
the Javadoc there, since it does not play well with "describe what you
will do, not how would you do it".

Thanks,
-Aleksey.