[foreign-jextract] RFR: MemorySegmentPool + Allocator [v8]

[Maurizio Cimadamore]

On Thu, 22 Apr 2021 20:23:56 GMT, Radoslaw Smogura <github.com+7535718+rsmogura at openjdk.org> wrote:

>> That's a pity JMH does not allow sub measurements
>
> I think that issue is related how JVM shapes code. If I'll write something like this 
> readSegment(s.memoryAddress.asSegment(size, scope));
> so I'll allocate a new segment based on address than the read performance goes up, and it's same as malloc version

See my other code comment - I think the issue here might be that the VM can't clearly see the segment size, so counted loop optimizations are not kicking in.

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PR: https://git.openjdk.java.net/panama-foreign/pull/509