[jdk16] RFR: 8259032: MappedMemorySegmentImpl#makeMappedSegment() ignores Unmapper#pagePosition

[Maurizio Cimadamore]

On Tue, 5 Jan 2021 16:03:04 GMT, Uwe Schindler <uschindler at openjdk.org> wrote:

>> In fact the new test only checks if everything is aligned like we expect, but it does not test that our mapping returns a memory segment with expected contents.
>
> So I tend to make a simple test without reflection that writes a defined sequence of bytes to a file and then maps it with various offsets, checking that the first byte in the mapped segment is from that sequence.

Good suggestion!

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PR: https://git.openjdk.java.net/jdk16/pull/84