Seriously? Windows has had this bizarre “working set” concept effectively forever. I thought it was weird when Windows 2000 was new, and I still think it’s wei

Seriously? Windows has had this bizarre “working set” concept effectively forever. I thought it was weird when Windows 2000 was new, and I still think it’s weird. In the land of page replacement algorithms, there are many of various degrees of cleverness, and then there’s “we exceeded an arbitrarily limit — nothing else needed that memory, but we’re going to zap it out of the page tables anyway!” (x86 has had “accessed” tracking for a long long time. What would be wrong with keeping over-the-working-set pages present but not “accessed” and tracking accesses without causing page faults? Or at least only trying to expire pages when there’s some degree of memory pressure.)