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Running it at guest teardown (batched by the timeout) is a better fit: teardown is when large contiguous regions actually go back to the hypervisor, so the scan only runs when there's real work to do instead of on a fixed timer. The case of a guest freeing a 1 GB region mid-life is then handled by the 1 GB-hugetlb page-cleanup follow-on, not by a periodic scan. I will also like to avoid looping on this — periodic vs teardown was already worked through in an earlier revision, and this is where we landed. Happy to revisit if there's a specific new concern, but otherwise I'd prefer to keep the current approach. Thanks, Ashish