RFR: Mixed evacuation [v7]

[Kelvin Nilsen]

On Thu, 22 Apr 2021 17:53:30 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Cosmetic improvements requested by review
>>   
>>   Following these changes, we ran jtreg TIER1 and hotspot_gc_shenandoah tests with no regressions.
>>   Also ran a stress Extremem workload.
>
> src/hotspot/share/gc/shenandoah/shenandoahOldGC.cpp line 88:
> 
>> 86:   entry_coalesce_and_fill();
>> 87: 
>> 88:   old_heuristics->start_old_evacuations();
> 
> Could you encapsulate in entry_old_evacuations() with proper timing/logging?  it really helps future debugging the crashes with hs_err file.

Thanks.  I've created new function entry_old_evacuations(), which calls entry_coalesce_and_fill() followed by old_heuristics->start_old_evacuations().  There is already timing/logging in entry_coalesce_and_fill().  old_heuristics->start_old_evacuations() just "flips a switch" so that subsequent evacuations will fold in old-gen collection sets so I don't think we need any timing there.

This will show up in next commit.

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PR: https://git.openjdk.java.net/shenandoah/pull/29