[jdk8u-dev] RFR: 8159720: Failure of C2 compilation with tiered prevents some C1 compilations

Tue Nov 8 19:57:41 UTC 2022

On Tue, 8 Nov 2022 02:29:19 GMT, Yi Yang <yyang at openjdk.org> wrote:

> 8u backport request: Spark observes a significant performance deterioration between jdk17 and jdk8, too many live locals prevent C2 from compilation and it refreshes all tiers of results, please see [SPARK-40303](https://issues.apache.org/jira/browse/SPARK-40303?focusedCommentId=17619978&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17619978) for more details and explanations. This fix makes C2 compilation failure not affect C1. Low risk and apply clean.
> 
> Please help review it, thanks in advance.

Lgtm. This backport doesn't affect C2 itself, it just allows C1 to compile methods that C2 can't.

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Marked as reviewed by phh (Reviewer).

PR: https://git.openjdk.org/jdk8u-dev/pull/161