RFR: JDK-8311261: [AIX] TestAlwaysPreTouchStacks.java fails due to java.lang.RuntimeException: Did not find expected NMT output

[Tyler Steele]

On Tue, 18 Jul 2023 17:07:09 GMT, Varada M <duke at openjdk.org> wrote:

> On AIX we are getting the pattern “Stack: “, but the test is expecting the pattern : ".*stack: reserved=(\\d+), committed=(\\d+).*”. This is due to track_as_vm() is returning false on AIX. The function should return false because on AIX by [default page is not aligned](https://github.com/openjdk/jdk/blob/354c6605e32790ca421869636d8bf5456fc51717/src/hotspot/share/services/threadStackTracker.hpp#L57). Thus disabling the test on AIX.
> 
> JBS Issue : [JDK-8311261](https://bugs.openjdk.org/browse/JDK-8311261)

@varada1110 @tstuefe, I am thinking of this in relation to the discussion on [this PR](https://github.com/openjdk/jdk/pull/14904#issuecomment-1640558149). Are these stacks not-page aligned, or would making the change suggested there affect the validity of this test on AIX?

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PR Comment: https://git.openjdk.org/jdk/pull/14923#issuecomment-1644529393