RFR: 8312180: (bf) MappedMemoryUtils passes incorrect arguments to msync (aix) [v3]

[Christoph Langer]

On Mon, 31 Jul 2023 21:49:06 GMT, Tyler Steele <tsteele at openjdk.org> wrote:

>> This change is as an alternate solution to my original proposal for [JDK-8312180](https://bugs.openjdk.org/browse/JDK-8312180).
>> 
>> Suggested by @tstuefe.
>> 
>> This change matches the return value of Bits.pageSize with the system page size (which is not currently true on AIX).
>> 
>> These tests are upstream of my target test (TestByteBuffer) and results are encouraging. Tier1 testing ~in ongoing for this change~ passes with flying colours.
>
> Tyler Steele has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Removes include unistd & replaces it with util/globalDefs.hpp
>  - Replace os::vm_page_size call with sysconf(_SC_PAGESIZE) on AIX in javaClasses.cpp

Marked as reviewed by clanger (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14963#pullrequestreview-1570222488