I don't think I've ever written a substantial program that didn't have *some* sort of caching in it, to trade off space against time somewhere where `spend the time, every time' was undesirable. Often these caches are not expected to be terribly large, and have the exciting expiration policy `never', but it would be fairly trivial to respond to a mem_notify signal by just ditching the entire contents of all of those caches.
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