Well, remember that we _are_ talking about pages that have been aged (just
a bit more aggressively than some other pages), and are not being used.
Dropping them may well be the right thing to do, and migrating them is
potentially very costly indeed (and can cause oscillating patterns etc
Yes, true page migration might eventually be something we have to start
thinking about for NUMA machines, but I'd really really prefer just about
any alternative. Getting a good balance would be _much_ preferable to
having to take out the sledgehammer..
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