RFR: JDK-8262068: Improve G1 Full GC by skipping compaction for regions with high survival ratio [v12]

Thomas Schatzl tschatzl at openjdk.java.net
Tue Apr 6 14:04:21 UTC 2021


On Wed, 31 Mar 2021 09:59:51 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> [Here](https://github.com/tschatzl/jdk/tree/bot-fixes) is a potential fix for this. This needs some discussion on whether an alternatives would be better or not; more of them could be:
>> * just initialize a dummy BOT for not-compacted young region
>> * exclude young regions from this dead-wood scheme
>> In any case this fix should probably go in separately.
>
>> [Here](https://github.com/tschatzl/jdk/tree/bot-fixes) is a potential fix for this. 
> 
> Thanks for the fix.
>>   In any case this fix should probably go in separately.
> 
> Do you mean we push this pr, then discuss the fix in another thread? If yes, I will file a bug to track the issue and initialize discussion on this bug.

This change should go in after PR#3356 which fixes this issue. I think it is a change that is worth pointing out and discussing separately - as you might see from the long description.

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



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