RFR (XS) 8242638: Shenandoah: restore heap logging for uncommit

[Zhengyu Gu]

Looks good.

-Zhengyu

On 4/14/20 9:24 AM, Aleksey Shipilev wrote:
> Bug:
>    https://bugs.openjdk.java.net/browse/JDK-8242638
> 
> Fix:
> 
> diff -r 72920184520f src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp
> --- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp        Tue Apr 14 14:45:24 2020 +0200
> +++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp        Tue Apr 14 15:22:52 2020 +0200
> @@ -2870,5 +2870,5 @@
>   void ShenandoahHeap::entry_uncommit(double shrink_before) {
>     static const char *msg = "Concurrent uncommit";
> -  ShenandoahConcurrentPhase gc_phase(msg);
> +  ShenandoahConcurrentPhase gc_phase(msg, true /* log_heap_usage */);
>     EventMark em("%s", msg);
> 
> Testing: hotspot_gc_shenandoah, eyeballing logs
>