RFR: Concurrent uncommit should be recorded as GC event + perf

[Roman Kennke]

Am 06.07.2018 um 19:10 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/uncommit-events/webrev.01/
> 
> This implements two easy improvements in heap uncommit: recording the currently hidden event
> properly in statistics to observe the real time concurrent thread spend dealing with uncommits, and
> simple lock interleaving with SpinPause, like we do in FreeSet::recycle_trash.
> 
> Testing: tier3_gc_shenandoah, ad-hoc benchmarks
> 
> Thanks,
> -Aleksey
> 

Ok. Go!