RFR: Borrow from old gen [v2]

[Kelvin Nilsen]

On Tue, 8 Feb 2022 00:22:10 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp line 309:
>> 
>>> 307:           range(1,100)                                                      \
>>> 308:                                                                             \
>>> 309:   product(uintx, ShenandoahOldEvacRatioPer128, 16, EXPERIMENTAL,            \
>> 
>> These `Per128` options are evaluated once per cycle? I would just take the floating point hit for a more user friendly percentage.
>
> That's a good improvement.  I'll work on this.

This has been addressed.

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PR: https://git.openjdk.java.net/shenandoah/pull/110