Integrated: 8261504: Shenandoah: reconsider ShenandoahJavaThreadsIterator::claim memory ordering

[Aleksey Shipilev]

On Wed, 10 Feb 2021 12:00:38 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> JDK-8256298 added the thread iterator for thread roots, and I don't think we need the Hotspot's default memory_order_conservative, which emits two-way memory fences around the CASes at least on AArch64 and PPC64. The simple "relaxed" should do.
> 
> Additional testing:
>  - [x] Linux x86_64 hotspot_gc_shenandoah
>  - [x] Linux AArch64 hotspot_gc_shenandoah
>  - [x] Linux AArch64 tier1 with Shenandoah

This pull request has now been integrated.

Changeset: df0897ea
Author:    Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/df0897ea
Stats:     1 line in 1 file changed: 0 ins; 0 del; 1 mod

8261504: Shenandoah: reconsider ShenandoahJavaThreadsIterator::claim memory ordering

Reviewed-by: zgu

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PR: https://git.openjdk.java.net/jdk/pull/2506