RFR: 8036698: Add trace event for updates to metaspace gc threshold

[Stefan Karlsson]

On 2014-03-06 09:14, Erik Helin wrote:
> Hi all,
>
> this change adds a new trace event, vm/gc/metaspace/gc_threshold that 
> tracks updates to the metaspace GC threshold 
> (MetaspaceGC::_capacity_until_gc).
>
> The event contains the old value of MetaspaceGC::_capacity_until_gc, 
> the new value and also the named of the method that changed the value.
>
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8036698
>
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8036698/webrev.00/

Looks good.

StefanK

>
> Testing:
> - JFR JTREG tests
> - JPRT
>
> Thanks,
> Erik