RFR: Enable ShenandoahEvacReserveOverflow by default

[Roman Kennke]

Yes that makes sense. Thanks!

Roman


Am 3. September 2018 11:08:33 MESZ schrieb Aleksey Shipilev <shade at redhat.com>:
>Some of weekend tests feel much better with evac-reserve overflows
>allowed. Let's make that the default:
>
>diff -r f8f9c1f0f62b
>src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp
>--- a/src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp    Sat Sep
>01 17:09:56 2018 +0200
>+++ b/src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp    Mon Sep
>03 11:07:17 2018 +0200
>@@ -202,10 +202,9 @@
>    range(1,100)                                                      \
>                                                                      \
>-  experimental(bool, ShenandoahEvacReserveOverflow, false,            
>     \
>+  experimental(bool, ShenandoahEvacReserveOverflow, true,             
>     \
>         "Allow evacuations to overflow the reserved space. "         \
>         "Enabling it will make evacuations more resilient when "     \
>         "evacuation reserve/waste is incorrect, at the risk that "   \
>-               "application allocations run out of memory too early. "
>     \
>-               "This is safe to enable when pacing is disabled.")     
>     \
>+               "application allocations run out of memory too early.")
>     \
>                                                                      \
>experimental(uintx, ShenandoahImmediateThreshold, 90,                  
>  \
>
>Testing: tier1_gc_shenandoah, ad-hoc benchmarks
>
>Thanks,
>-Aleksey