RFR: 8352251: Implement JEP 518: JFR Cooperative Sampling [v32]

[Markus Grönlund]

On Fri, 23 May 2025 19:47:16 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

>>> Hi, Could you please incorporate this change for riscv? Thanks. [RealFYang at be8eac4](https://github.com/RealFYang/jdk/commit/be8eac493bef865d7825848f0b31a06d95b08efc) This passed `hotspot_serviceability` and `jdk_svc` tests on linux-riscv64 platform with both release and fastdebug builds.
>> 
>> Thanks a lot for the patch.
>> 
>> Unfortunately we changed direction a bit after you submitted it, because of implementation difficulties on other platforms.
>> 
>> Can you please take a look at the new and simpler version?
>> 
>> Thanks
>> Markus
>
>> > Hi, Could you please incorporate this change for riscv? Thanks. [RealFYang at be8eac4](https://github.com/RealFYang/jdk/commit/be8eac493bef865d7825848f0b31a06d95b08efc) This passed `hotspot_serviceability` and `jdk_svc` tests on linux-riscv64 platform with both release and fastdebug builds.
>> 
>> Thanks a lot for the patch.
>> 
>> Unfortunately we changed direction a bit after you submitted it, because of implementation difficulties on other platforms.
>> 
>> Can you please take a look at the new and simpler version?
>> 
>> Thanks Markus
> 
> ping @RealFYang

> @mgronlun : Thanks for the ping! New riscv version which reflects the latest changes: [RealFYang at cba533a](https://github.com/RealFYang/jdk/commit/cba533aac60476e4893fd57e2d459d69b95ecfbf) I performed tier1-3, hotspot_serviceability and jdk_svc tests on linux-riscv64 platform. Result looks good.

Thanks Fei for the patch. It has been integrated.

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PR Comment: https://git.openjdk.org/jdk/pull/24296#issuecomment-2909304625