/*
  * A callback you can register to apply pressure to ageable caches.

It's much more than just a single callback these days.

+ * @scan_objects will be made from the current reclaim context.
  */
 struct shrinker {
 	int (*shrink)(struct shrinker *, struct shrink_control *sc);
+	long (*count_objects)(struct shrinker *, struct shrink_control *sc);
+	long (*scan_objects)(struct shrinker *, struct shrink_control *sc);

Is shrink_object really such a good name for this method?

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