RFR: Abandon mixed collections if all candidates are pinned [v2]

[William Kemper]

On Wed, 29 Mar 2023 23:44:29 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Improve description of new ShenandoahCoalesceChance diagnostic option
>
> src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp line 454:
> 
>> 452:           "Testing: make lots of artificial allocation failures.")          \
>> 453:                                                                             \
>> 454:   product(uintx, ShenandoahCoalesceChance, 0, DIAGNOSTIC,                   \
> 
> Should this read: "Abandon remaining mixed collections with this likelihood.  Following each mixed collection, we abandon all remaining mixed collection candidate regions with likelihood ShenandoahCoalesceChance." ?  (I don't think this is precisely abandon this percentage of mixed collections".)

Yes, that's a more accurate description. I'll update this description.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/236#discussion_r1153525025