G1: Lightweight remembered set logging

[Thomas Schatzl]

Hi,

On 25.04.22 11:04, Clemens Eisserer wrote:
> Hi Thomas,
> 
>> There have been two major changes in G1 remset recently:
>>>
>>> https://bugs.openjdk.java.net/browse/JDK-8262185
>>> https://bugs.openjdk.java.net/browse/JDK-8017163
>>>
>>> It can be interesting to try the latest release (JDK18) first.
>>
> 
> I read your blog post when it was published and was glad to hear G1 still
> has so much potential for improvements.
> Do you think there is any chance to get it back-ported to JDK-17 once it
> has proven to be solid, otherwise it will take years to be useful for
> production...

   I'm not aware of any efforts of backporting the remembered set 
refactoring (JDK-8017163) to JDK 17 within Oracle at this point. You 
will need to ask the current maintainers 
(https://wiki.openjdk.java.net/display/JDKUpdates/JDK+17u) and find 
somebody to actually do this backport.

While apparently very stable (the changes just missed the JDK 17 release 
window; iirc we have not needed to do anything significant but minor 
cleanups for it until now), it is a very big change that risks stability.

The next LTS release is scheduled to be JDK 21 
(https://www.oracle.com/java/technologies/java-se-support-roadmap.html) 
next year.

Thanks,
   Thomas