RFR: JDK-8266419: [aix] in mmap mode, os::attempt_reserve_memory_at() fails to handle wrong mapping address

[Thomas Stuefe]

On Mon, 3 May 2021 06:36:15 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> On AIX, in mmap() mode, if the mmap call succeeds but not at the requested address, the mapping should be unmapped and the operation should count as error - like it is done on all other platforms.
> 
> (AFAICS this is a day zero bug in our port - mmap mode is seldomly used).
> 
> Tested: Nightlies at SAP with and without 4K pages.

Note that since we don't have that many AIX reviewers, and this only concerns AIX code, I go ahead and push. It is our port anyway, if something breaks we will have to fix it.

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PR: https://git.openjdk.java.net/jdk/pull/3834