RFR: 8344009: Improve compiler memory statistics

[Roberto Castañeda Lozano]

On Fri, 14 Feb 2025 08:55:26 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

> Hi Thomas, this looks very useful, thanks! I will run some Oracle-internal functional and performance testing and come back with the results next week.

Functional test results (Oracle internal tier1-tier5) look good.

I measured C2 execution time before and after the changeset using DaCapo 23 and did not find any statistically significant difference, except for a 2-3% regression on the jython benchmark (using large input size). This small regression is IMO acceptable, particularly given that these changes can be seen as an investment to improve compiler resource utilization in the long run.

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PR Comment: https://git.openjdk.org/jdk/pull/23530#issuecomment-2665162403