RFR: 8324186: AARCH64: Use "dmb.ishst+dmb.ishld" for release barrier

[Andrew Haley]

On Mon, 22 Jan 2024 03:59:33 GMT, Fei Yang <fyang at openjdk.org> wrote:

> I wonder if this was tested on other vendors' hardware? I witnessed some negative impact at least on HiSilicon TSV110 running the same JMH. So I guess it might be safer to go as a vendor-specific change.

That's interesting, but I guess it's only 14% on a microbenchmark which is intended to stress this as much as possible. Do we have any idea why this regresses?

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PR Comment: https://git.openjdk.org/jdk/pull/17511#issuecomment-1903671810