On Mon, 16 Dec 2024 11:01:11 GMT, Maurizio Cimadamore <mcimadam...@openjdk.org>
wrote:
>> Quan Anh Mai has updated the pull request incrementally with two additional
>> commits since the last revision:
>>
>> - wrong init
>> - move segment instance creation to SegmentFactories
>
> test/micro/org/openjdk/bench/java/lang/foreign/AllocTest.java line 77:
>
>> 75: var freeAddr = lookup.findOrThrow("free");
>> 76: CALLOC = linker.downcallHandle(callocAddr,
>> FunctionDescriptor.of(ValueLayout.JAVA_LONG, ValueLayout.JAVA_LONG,
>> ValueLayout.JAVA_LONG));
>> 77: FREE = linker.downcallHandle(freeAddr,
>> FunctionDescriptor.ofVoid(ValueLayout.JAVA_LONG));
>
> I'm not sure these changes are needed. It seems the main goal here is to
> avoid the cost of the capture associated with `CLayouts::freeMemory` ? If so,
> can't we just store that consumer into a static final and call it a day? I
> think then we could avoid the `static` init, and leave most of the code
> unchanged, except for the additional static field?
The main goal here is that passing/receiving raw addresses as longs is cheaper
than as `MemorySegment`s.
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PR Review Comment: https://git.openjdk.org/jdk/pull/22610#discussion_r1925646301
