RFR [8u]: ShenandoahSATBBufferSize cannot be size_t in 8u

[Roman Kennke]

Ok.

> This is 8u-specific. We cannot have the size_t flag here, because it would not be settable without:
>   https://bugs.openjdk.java.net/browse/JDK-8054823
> 
> The attempt to set it would fail with "Improperly specified VM option: -XX:ShenandoahSATBBufferSize=1K".
> 
> Fix:
> 
> diff -r d215450bcdca -r 3355d7c81b7b src/share/vm/gc_implementation/shenandoah/shenandoah_globals.hpp
> --- a/src/share/vm/gc_implementation/shenandoah/shenandoah_globals.hpp  Mon Nov 12 18:02:02 2018 +0100
> +++ b/src/share/vm/gc_implementation/shenandoah/shenandoah_globals.hpp  Mon Nov 12 18:31:06 2018 +0100
> @@ -235,7 +235,7 @@
>    experimental(bool, ShenandoahWriteBarrierCsetTestInIR, true,              \
>            "Perform cset test in IR rather than in the stub")                \
>                                                                              \
> -  experimental(size_t, ShenandoahSATBBufferSize, 1 * K,                     \
> +  experimental(intx, ShenandoahSATBBufferSize, 1 * K,                       \
>            "Number of entries in an SATB log buffer.")                       \
>                                                                              \
>    product_rw(int, ShenandoahRegionSamplingRate, 40,                         \
> 
> 
> Testing: tier1_gc_shenandoah, ad-hoc tests
> 
> Thanks,
> -Aleksey
>