On Tue, 5 Jan 2021 15:33:54 GMT, Maurizio Cimadamore <mcimadam...@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.

Hi,
The new test looks fine to me.
Uwe

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

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