RFR: 8316694: Implement relocation of nmethod within CodeCache [v42]

[Erik Österlund]

On Thu, 21 Aug 2025 14:56:30 GMT, Robbin Ehn <rehn at openjdk.org> wrote:

> By using less itbl entries we can significant increase ipc on these CPUs.
> 
> Simple testing with some eariler version of this got ~10% reduction in frontend stalls (take that number with a grain of salt).
> 
> Now if this is correct approach or not, that's is still unclear to me.

Okay that sounds quite promising.

So what is the driver for this relocation in the JVM, which makes sure hot nmethods get moved together?

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PR Comment: https://git.openjdk.org/jdk/pull/23573#issuecomment-3211194188