8361099: Shenandoah: Improve heap lock contention by using CAS for memory allocation

[pengxiaolong]

TBD

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8361099: Shenandoah: Improve heap lock contention by using CAS for memory allocation (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/26171/head:pull/26171
$ git checkout pull/26171

Update a local copy of the PR:
$ git checkout pull/26171
$ git pull https://git.openjdk.org/jdk.git pull/26171/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 26171

View PR using the GUI difftool:
$ git pr show -t 26171

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/26171.diff

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@pengxiaolong The following labels will be automatically applied to this pull request:

• hotspot-gc
• shenandoah

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