Bug ID: JDK-8278241 Implement JVM SpinPause on linux-aarch64

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JDK 17	JDK 19
17.0.12-oracleFixed	19 b03Fixed

JDK-8186670 added OnSpinWaitInst/OnSpinWaitInstCount options which allow to specify an implementation of spin pause: an instruction and a number of it. These information can be used in an implementation of JVM SpinPause.

A pull request was submitted for review. URL: https://git.openjdk.java.net/jdk17u-dev/pull/116 Date: 2022-01-24 15:09:15 +0000

24-01-2022

Fix Request (17u) A backport of a configurable implementation of JVM SpinPause to improve performance of contended locks and to achieve parity with x86 which has implemented SpinPause. The risk of changes is low. They enable one ISB-based implementation for Neoverse N1. Other AArch64 will continue using an empty implementation. Tested for fastdebug and release builds: - gtest: Passed - tier1...tier4: Passed - hotspot/jtreg/runtime/Thread/TestSpinPause.java: Passed It can be considered as clean. Applying the patch has an issue to find a proper position in stubGenerator_aarch64.cpp. No code changes are needed after repositioning.

24-01-2022

Changeset: bcb79fd0 Author: Evgeny Astigeevich <eastig@amazon.com> Committer: Paul Hohensee <phh@openjdk.org> Date: 2021-12-15 16:57:30 +0000 URL: https://git.openjdk.java.net/jdk/commit/bcb79fd012c9c298e58c20c59e564e9d2c16b970

15-12-2021

Duplicate :	JDK-8258604 - Use 'isb' instruction in SpinPause on linux-aarch64
Duplicate :	JDK-8186671 - Use `yield` instruction in SpinPause on linux-aarch64
Relates :	JDK-8186670 - Implement _onSpinWait() intrinsic for AArch64