[jdk21u-dev] RFR: 8334371: [AIX] Beginning with AIX 7.3 TL1 mmap() supports 64K memory pages

[Martin Doerr]

On Mon, 27 Jan 2025 12:13:46 GMT, Joachim Kern <jkern at openjdk.org> wrote:

> Beginning with AIX 7.3 TL1 mmap() supports 64K memory pages. As an enhancement, during the initialization of the VM the availability of this new feature is examined. If the 64K pages are supported the VM will use mmap() with 64K pages instead of shmget()/shmat() with 64K pages due to the bad 256M alignment of shmget()/shmat().

This change differs significantly from the original change. Please explain all differences.

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PR Review: https://git.openjdk.org/jdk21u-dev/pull/1362#pullrequestreview-2575449090