RFR: 8303040: linux PPC64le: Implementation of Foreign Function & Memory API (Preview) [v3]

[Robbin Ehn]

On Fri, 24 Feb 2023 07:17:30 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> ~I don't think we've done that much testing with UseSystemMemoryBarrier since it was added~. I'm a bit nervous about turning it on by default since it's currently also used for JNI. Let's see what Robbin thinks.

For reliability:
On every Oracle tier 5 we run these test two groups:
vmTestbase_nsk_jvmti, open/test/hotspot/jtreg/:hotspot_runtime
For each of  linux_x64_debug,  windows_x64, linux_aarch64_debug with sysmembar on.
I picked jvmti as this is very heavy on 'JNI'. No issues reported that I know about.
We also have this test:
SystemMembarHandshakeTransitionTest.java which only JNI transisition with this options.

For performance, the heavy lifting is on reader of thread state and the only case I have identified is JFR.

I suggest changing the default now, if there is issues we have time to revert it back before RDP1.

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PR: https://git.openjdk.org/jdk/pull/12708