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

[Fei Yang]

On Mon, 22 Jan 2024 15:09:38 GMT, kuaiwei <duke 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.
> 
> I tried a number of different machines and saw regressions only on Kunpeng-920 (same CPU?) and A57 which is quite niche at this point.

@nick-arm : Thanks for trying it out. Yeah, TSV110 is the core micro-arch name for Kunpeng-920. @theRealAph : I don't have access to the details of TSV110 any more, I guess it's not easy to figure out what's going on :-(

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PR Comment: https://git.openjdk.org/jdk/pull/17511#issuecomment-1905181538