[jdk25] RFR: 8352075: Perf regression accessing fields

[Coleen Phillimore]

On Thu, 19 Jun 2025 10:02:45 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Thank you for the backport! @shipilev indicated that the backport to 21 should wait a bit, could you clarify when should I file that (e.g. end of July, ...)?
>
>> @shipilev indicated that the backport to 21 should wait a bit, could you clarify when should I file that (e.g. end of July, ...)?
> 
> I would say for the fairly big change like this, we want to wait until JDK 25 GA (that would pass the all-tests-run). It would be too late for Oct 2025 release, though. So realistically, this would target January 2026 release. You can pull this patch to your downstream JDK 21 to see if there are any troubles ahead of this path, this will also soothe 21u maintainer concerns, I think.

So @shipilev, JDK 25 is in rampdown phase 1.  Rampdown phase 2 starts 7/17.  It's a big change for JDK 25.  My sense of the risk is that it's not high.  If it's checked in now, I think it'll get more testing than if it gets backported to a 25.01 release.  I'll discuss it with people here.  I think for JDK 21, we should wait for more testing to be run after 25 GA.

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PR Comment: https://git.openjdk.org/jdk/pull/25877#issuecomment-2992962430