When will a StackDepotNode be removed from StackDepot?

[Robin Wen]

From the source code, I see that a StackDepotNode is inserted into the hash table maintained by StackDepot, but I don't see any code that removes a node from the hash table. Is this hash table only growing without shrinking?

I encountered an issue where the program becomes abnormally slow over time when running under tsan. Based on my tests, the main overhead is in the function StackDepotBase<Node, kReservedBits, kTabSizeLog>::Put. Could this be because the bucket size of the hash table is fixed, and as the number of entries increases, the lookup performance of the hash table significantly degrades?