RFR: 8277736: G1: Allow forced evacuation failure of first N regions in collection set [v2]

[Thomas Schatzl]

On Wed, 1 Dec 2021 01:19:38 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> src/hotspot/share/gc/g1/g1_globals.hpp line 78:
>> 
>>> 76:           "evacuation pauses")                                              \
>>> 77:                                                                             \
>>> 78:   product(uintx, G1EvacuationFailureALotCSetPercent, 100,                   \
>> 
>> Why `uintx`? Does `uint` work?
>
> I will refine the explanation specifically.
> As Thomas suggested, an random selection will be added later, I plan to add another bool option to indicate if it's random selection or not, so will keep `G1EvacuationFailureALotCSetPercent`.

Another, imo better way would be allowing a string for the type of selection algorithm, like `VerifyGCType`, with current possible values being `NthObject` (or just default) and `FirstRegions` or so.

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PR: https://git.openjdk.java.net/jdk/pull/6561