>
> > * the key is automatically regenerated every 2 hours (or whatever); as
> > pages encrypted under the old key age out, it can be freed eventually
>
> This'll require changes to dmcrypt but it's doable.
but it's not useful since linux actually generally keeps the pages also
in swap even when they're back in memory (so that if there's memory
pressure again they can just be swapped out cheap again), this leads to
very very long lived swap pages
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