RFR: 8361099: Shenandoah: Improve heap lock contention by using CAS for memory allocation [v17]

[Xiaolong Peng]

On Tue, 6 Jan 2026 21:00:03 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> Are you running any experiments (on different hardware configurations) to test your assumptions about this?
>
> Please document the results of any experiments as rationale for the final design.

I did run some experiments and didn't see significant difference, I will keep keep current code using PaddedArray, meanwhile keep this conversation open and make a decision based metrics later after I address the other comments.

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PR Review Comment: https://git.openjdk.org/jdk/pull/26171#discussion_r2670084604