[jdk21u-dev] RFR: 8180450: secondary_super_cache does not scale well

[Andrew Haley]

On Thu, 24 Oct 2024 10:10:45 GMT, Andrew Haley <aph at openjdk.org> wrote:

> See [8180450](https://github.com/openjdk/jdk/pull/18309) for a full description of how this works.
> This is a pretty clean backport, but a few files had to be fiddled manually because things had been added nearby.
> 
> This PR also includes a fix for [[8337958](https://bugs.openjdk.org/browse/JDK-8337958)](https://bugs.openjdk.org/browse/JDK-8337958), which was a minor bug in the original commit.
> 
> For a justification of why this PR should be backported to JDK 21u, see 
> [Franz's email](https://mail.openjdk.org/pipermail/jdk-updates-dev/2024-October/038649.html).

For avoidance of doubt:

A later bug, https://bugs.openjdk.org/browse/JDK-8344355, does not apply to this PR. The bug 8344355 fixed was caused by 8331341: secondary_super_cache does not scale well: C1 and interpreter. 8331341 is not included here, and I have no intention of ever backporting it.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1090#issuecomment-2640710960