RFR: JDK-8262068: Improve G1 Full GC by skipping compaction for regions with high survival ratio [v14]

[Hamlin Li]

On Fri, 9 Apr 2021 12:26:35 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

>> It is fine with me to fix this separately.
>> 
>> There is some lazy mechanism to fill this BOT, but it does not work in this case (which is the gist of what I said above).
>
> Note that if that were fixed, I think PR #3356 would not be needed - because then young region BOTs have the expected contents :) Your call.

Thanks Thomas!
Although I'm not sure if pr #3356  is still necessary. But sure, I will add code to fill BOTs for "young" regions as a follow-up fix/enhanacement of this issue, I have just created an bug to track it https://bugs.openjdk.java.net/browse/JDK-8264987.
So after this pr is approved and integrated I will initialize the pr for JDK-8264987.

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PR: https://git.openjdk.java.net/jdk/pull/2760