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+ o Minor features (DOS resistance):
+ - Count the total number of bytes used storing hidden service descriptors
+ against the value of MaxMemInQueues. If we're low on memory, and more
+ than 20% of our memory is used holding hidden service descriptors, free
+ them until no more than 10% of our memory holds hidden service
+ descriptors. Free the least recently fetched descriptors first.
+ Resolves ticket 13806.
+