[foreign-memaccess+abi] RFR: MemorySegmentPool + Allocator [v13]

[Radoslaw Smogura]

On Mon, 4 Sep 2023 17:59:58 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> Radoslaw Smogura has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Make acquire of parent (pool scope) optional - 5ns per ops / down.
>>   
>>   ```StrLenTest.panama_strlen_arena                               5  avgt   10   35.290 ?   1.756  ns/op
>>     StrLenTest.panama_strlen_arena                              20  avgt   10   54.778 ?   3.094  ns/op
>>     StrLenTest.panama_strlen_arena                             100  avgt    3   97.301 ? 137.266  ns/op
>>     StrLenTest.panama_strlen_memsegmentpool_allocator            5  avgt   10   46.160 ?   0.654  ns/op
>>     StrLenTest.panama_strlen_memsegmentpool_allocator           20  avgt   10   52.966 ?   1.095  ns/op
>>     StrLenTest.panama_strlen_memsegmentpool_allocator          100  avgt   10   66.377 ?   0.878  ns/op
>>     StrLenTest.panama_strlen_memsegmentpool_allocator_copy       5  avgt   10   47.412 ?   1.073  ns/op
>>     StrLenTest.panama_strlen_memsegmentpool_allocator_copy      20  avgt   10   52.349 ?   1.296  ns/op
>>     StrLenTest.panama_strlen_memsegmentpool_allocator_copy     100  avgt   10   79.623 ?   1.616  ns/op
>>     StrLenTest.panama_strlen_prefix                              5  avgt   10   27.352 ?   0.659  ns/op
>>     StrLenTest.panama_strlen_prefix                             20  avgt   10   33.634 ?   0.081  ns/op
>>     StrLenTest.panama_strlen_prefix                            100  avgt   10   49.974 ?   0.097  ns/op
>>     StrLenTest.panama_strlen_unsafe                              5  avgt   10   51.266 ?   0.558  ns/op
>>     StrLenTest.panama_strlen_unsafe                             20  avgt   10   63.194 ?   0.360  ns/op
>>     StrLenTest.panama_strlen_unsafe                            100  avgt   10   60.800 ?   0.821  ns/op
>>     StrLenTest.panama_strlen_unsafe_trivial                      5  avgt   10   27.343 ?   0.094  ns/op
>>     StrLenTest.panama_strlen_unsafe_trivial                     20  avgt   10   32.997 ?   0.383  ns/op
>>     StrLenTest.panama_strlen_unsafe_trivial                    100  avgt   10   49.065 ?   0.756  ns/op
>>    ```
>
> Ping: does this PR needs to be open? (Perhaps it might be useful to update and make it a draft JEP, as an example of how the allocator API could be used?)

Hi @mcimadamore - I hope you have good day. I wonder if this PR should be kept or closed. I remember that plan was to introduce it after stabilisation of API, but not sure if this plan have not changed?

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PR Comment: https://git.openjdk.org/panama-foreign/pull/509#issuecomment-1861801695