On Fri, 24 Feb 2023 07:17:30 GMT, Jorn Vernee <jver...@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. ------------- PR: https://git.openjdk.org/jdk/pull/12708
