RFR: 8036696: Add metaspace gc threshold to metaspace summary trace event

[Jon Masamitsu]

Erik,

Why the choice of the variable name _gc_threshold instead of the
variable name _capacity_until_gc (the same variable name as
in Metaspace)?  Using the label "GC Threshold" seems ok.  I
can understand not making that title too geeky.

Otherwise, looks good.

Jon

On 3/6/2014 12:07 AM, Erik Helin wrote:
> Hi all,
>
> this change add the metaspace GC threshold 
> (Metaspace::_capacity_until_gc) to the trace event
> vm/gc/heap/metaspace_summary.
>
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8036696
>
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8036696/webrev.00/
>
> Testing:
> - JFR JTREG tests
> - JPRT
>
> Thanks,
> Erik