Integrated: 8364936: Shenandoah: Switch nmethod entry barriers to conc_instruction_and_data_patch

Mon Sep 8 21:47:21 UTC 2025

On Fri, 29 Aug 2025 00:02:42 GMT, Cesar Soares Lucas <cslucas at openjdk.org> wrote:

> Please, review this patch to make nmethod entry barriers use `conc-instruction-and-data-patch` fence mechanics when ShenandoahGC is being used on AArch64. The patch also removes (including from JVMCI interface) the old constant that was being used only by Shenandoah on AArch64.
> 
> The patch has been tested with functional and performance benchmarks on AArch64. Improvements in DaCapo and Renaissance benchmarks can be as high as 30%. Maximum critical Jops in SPEC improved by ~10%.

This pull request has now been integrated.

Changeset: 81a1e8e1
Author:    Cesar Soares Lucas <cslucas at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/81a1e8e1363446de499a59fc706221efde12dd86
Stats:     28 lines in 12 files changed: 0 ins; 19 del; 9 mod

8364936: Shenandoah: Switch nmethod entry barriers to conc_instruction_and_data_patch

Reviewed-by: fyang, dzhang, kdnilsen, wkemper

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PR: https://git.openjdk.org/jdk/pull/26999