RFR: 8303210: [linux, Windows] Enable UseSystemMemoryBarrier by default if possible [v2]

Tue Feb 28 05:33:04 UTC 2023

On Tue, 28 Feb 2023 01:15:13 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I'm running a swag of our benchmarks on linux-x64 and linux-aarch64 with the flag simply set to true. Preliminary results show a big hit on startup benchmarks on both platforms!

Interesting. I had only checked large benchmarks before. I don't know why startup is impacted. There were also concerns when many single thread handshakes are used. Maybe you're right and I should only make the feature available on all platforms for now (and keep it experimental and switched off).

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PR: https://git.openjdk.org/jdk/pull/12753