quoted

Sorry, I have trouble parsing this sentence, could you elaborate on "when"?

page_referenced() indicates if a page was accessed since the previous
page_referenced() call.

page_referenced_kstaled() indicates if a page was accessed since the
previous page_referenced_kstaled() call.

Both of the functions need to clear PTE young bits; however we don't
want the two functions to interfere with each other. To achieve this,
we add two page bits to indicate when a young PTE has been observed by
one of the functions but not by the other.

OK and this gives different page aging schemes for the same page? Is
this to track state changes

PR1 sees: PTE x young as 0
PR2 sees: PTE x as 1, the rest to 0

so PR1 and PR2 will disagree? Should I be looking deeper in the
patches to understand

Balbir

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