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https://github.com/ruby/ruby/blob/master/doc/yjit/yjit.md#co...
It just dumps all the JIT-compiled code? I'd expect to see some kind of heuristic or algorithm there... LFU or something.
The internals of a JIT are essentially black magic to me, and I know the people working on YJIT are super talented, so I am sure there is a good reason why they just dump everything instead of the least-frequently used stuff. Maybe the overhead of trying frecency outweighs the gains, maybe they just haven't implemented it yet, or maybe it's just a rarely-reached condition.