I'm not sure that'd help - as someone else observed in another thread, loading anything into a cache requires evicting something else, and that eviction can be

I'm not sure that'd help - as someone else observed in another thread, loading anything into a cache requires evicting something else, and that eviction can be measured. You could do something like maintaining a full duplicate of the cache and tracking deltas, but I feel like that's back in "rearchitect the CPU from the ground up" territory.