RFR: JDK-8320368: Per-CPU optimization of Klass range reservation [v10]

[Thomas Stuefe]

On Sun, 26 Nov 2023 14:57:22 GMT, Andrew Haley <aph at openjdk.org> wrote:

> AArch64 looks good. One question, though: did you ever find the root cause of JDK-8318119? Without that, how do we know we've fixed it?

Didn't find it, no. I'll ping the originator again before pushing. The over-allocate-for-alignment allocation is just a stab, albeit an informed one. 

I had looked into kernel sources for OrangePi and examined the delta to the stock kernel. I did not find anything of note; the largest delta was added hardware descriptions for those SBCs. I wanted to find if the kernel limited mmap to specific addresses somehow, or if the address space was very small.

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PR Comment: https://git.openjdk.org/jdk/pull/16743#issuecomment-1827207959