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

Uwe Schindler uschindler at openjdk.java.net
Tue Jan 5 19:41:59 UTC 2021

On Tue, 5 Jan 2021 15:33:54 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> Hi,
> this patch fixes an oversight where the address() method in FileChannelImpl.Unmapper does not take into account the value of `pagePosition` - this leads to a situation in which, effectively, the specified offset when mapping the segment is ignored by the runtime (because base address will always be aligned to some known quantity - which is OS/platform dependent).
> To test this I had to break open into FileChannelImpl and ready the granularity.

The new test looks fine to me.


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

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