On Sat, 2021-03-13 at 00:57 -0700, Yu Zhao wrote:

> +/*
> + * After pages are faulted in, they become the youngest generation.
> They must
> + * go through aging process twice before they can be evicted. After
> first scan,
> + * their accessed bit set during initial faults are cleared and they
> become the
> + * second youngest generation. And second scan makes sure they
> haven't been used
> + * since the first.
> + */

I have to wonder if the reductions in OOM kills and 
low-memory tab discards is due to this aging policy
change, rather than from the switch to virtual scanning.

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