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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. > > Yes. > >> - 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. > > Well, no. You won't even run that when there are no SNP guests present. > >> 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. > > I wanted to have this in case pages do get freed up from time to time and you > get some sort of a fragmentation. But I'm being told that we don't support > balooning yet, neither memory hotplug and when the pages get freed, they > remain guest-owned. So yes, the points in time where those page become > HV-owned and potentially freed, then we should optimize. > > Please hold down that in the commit message so that it is clear for future > readers why we did it this way. > Will do — I have updated the patch 6 commit message to spell out why re-optimization is tied to guest teardown: SNP guests don't support ballooning or memory hotplug yet, so pages freed during a guest's lifetime stay guest-owned, and teardown is the only point where memory returns to hypervisor ownership and becomes eligible for re-optimization. That will be in the next revision. Thanks, Ashish