RFR: Broaden plab region search [v2]

[Kelvin Nilsen]

On Wed, 11 Jan 2023 16:43:31 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Unify GC heap status logging
>
> src/hotspot/share/gc/shenandoah/shenandoahFullGC.cpp line 179:
> 
>> 177:     size_t old_available = heap->old_generation()->available();
>> 178:     size_t young_available = heap->young_generation()->available();
>> 179:     log_info(gc, ergo)("At end of Full GC,  old_available: " SIZE_FORMAT "%s out of total: " SIZE_FORMAT "%s,"
> 
> Consider `ShenandoahGeneration::log_status`.

I've integrated the two heap-status logging approaches.  Let me know what you think...  Thanks for suggestion.

> src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp line 3194:
> 
>> 3192:           } else {
>> 3193:             // This object is not live so we don't verify dirty cards contained therein
>> 3194:             assert(tams != nullptr, "If object is not live, ctx and tams should be non-null");
> 
> Might need to rebase these changes after integrating #197 .

So far, git seems to feel like there are "no conflicts".  This code is identical to what I delivered in PR197.

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PR: https://git.openjdk.org/shenandoah/pull/198