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Re-optimizing at guest termination rather than via a periodic/runtime interface was Dave Hansen's suggestion in the v2 review — see https://lore.kernel.org/kvm/5102edd8-8eaa-4688-b3f7-3004c4cbc8f3@intel.com/" > >> and dropped because of being too disruptive — a timer-based scan would run >> on all cores every time it fires, even when no memory has been freed. > > What if it ran very seldomly, say once an hour? > >> 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. > > Are you saying a periodic scan won't handle anything? > > Because if it catches something, it will handle that something. A couple more reasons the event-driven trigger fits better than a fixed period: - Under churn (many SNP guests terminating and respawning), an hourly scan is too coarse — freed regions would sit un-optimized for up to an hour. The teardown trigger re-optimizes right after each burst of terminations (batched by the timeout), so it's more responsive than a periodic scan exactly when there's the most optimization work to do. - When no SNP guests run, a periodic scan achieves nothing: the initial pass already optimized all of memory and nothing has changed, so it just re-scans physmem for zero benefit. So the event-driven approach self-scales with real work — it runs as often as memory is actually freed and not at all when the system is idle — whereas a fixed timer is both too slow under load and pure overhead when idle. The mid-life contiguous-1 GB case is then caught precisely by the 1 GB-hugetlb page-cleanup hook when that lands, rather than by a coarse sweep. Thanks, Ashish > >> 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. > > Sorry, this is not how upstream review works. >