RE: [OT] When does the Working set manager invalidate s PT E's to share d pages?

> The Working Set contains a list of all valid PTEs,

And when the last reference to a shared page is deleted (when the working
set tuner invalidates the last PTE),
then the working set tuner will move the page to the modified or standby


If this so, why does the PFN entry need a back pointer to the referencing

For a shared page, it points to the referencing prototype PTE.
The purpose is to invalidate the PTE or PPTE completely (from Transition to Non-Present) when the page is re-allocated for some
other needs.


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