Integrated: 8277137: Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1

[Evgeny Astigeevich]

On Tue, 16 Nov 2021 18:14:15 GMT, Evgeny Astigeevich <duke at openjdk.java.net> wrote:

> One `ISB` implementation of `Thread.OnSpinWait` shows performance improvements on Graviton2 (Arm Neoverse N1 implementation), e.g. https://github.com/openjdk/jdk/pull/5562#issuecomment-966153163. 
> 
> Testing:
> - `make test TEST=gtest`: Passed
> - `make run-test TEST=tier1`: Passed
> - `make run-test TEST=tier2`: Passed
> - `make run-test TEST=hotspot/jtreg/compiler/onSpinWait`: Passed

This pull request has now been integrated.

Changeset: 38345bd2
Author:    Evgeny Astigeevich <eastig at amazon.com>
Committer: Volker Simonis <simonis at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/38345bd28db83371676f1685806ddc207a833879
Stats:     105 lines in 2 files changed: 105 ins; 0 del; 0 mod

8277137: Set OnSpinWaitInst/OnSpinWaitInstCount defaults to "isb"/1 for Arm Neoverse N1

Reviewed-by: phh, aph, ngasson

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PR: https://git.openjdk.java.net/jdk/pull/6415