Peter Zijlstra wrote:

Yes, why would unmapping a range make the pages more likely to be used
in the immediate future than otherwise indicated by their individual
young bits?

Even the opposite was suggested, that unmapping a range makes it less
likely to be used again.

I agree, the VM looks at the usage of individual pages and makes
decisions based on that.  We can only see how often individual
pages are referenced, and do not have much additional information
(except from the readahead code).

Making sweeping generalizations like "unmapping makes pages less
likely to be needed again" is bound to cause trouble for some
workloads.

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calls the other unpatriotic.

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