[jdk8u-dev] RFR: 8072422: Cleanup: Remove some unused flags/code in loop optimizations [v2]

Yi Yang yyang at openjdk.java.net
Wed Apr 6 06:59:41 UTC 2022


On Fri, 25 Mar 2022 10:27:51 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> > We do need the cleanup patch, because [alibaba/dragonwell8#305](https://github.com/alibaba/dragonwell8/issues/305) reports a crash due to use of UnrollLoopLimit, this flag is not supposed to be used by end users, it could be removed by cleanup patch. As I understand, the cleanup patch introduces another problem that can be fixed by JDK-8159715, so once cleanup backport is merged, I will backport JDK-8159715 as well.
> 
> So we have a work-around: Don't use `-XX:+UnlockDiagnosticVMOptions -XX:-UnrollLimitCheck`. We shouldn't take backporting non-critical fixes to JDK 8u lightly. This very much sounds like a `jdk8u-fix-no` candidate to me. Are you aware of this? https://mail.openjdk.java.net/pipermail/jdk8u-dev/2020-June/012002.html

Okay, I've read this guideline, it seems that the upstream mainline is not less willing to accept non-critical backports, I'm considering doing a backport in downstream.

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PR: https://git.openjdk.java.net/jdk8u-dev/pull/22


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