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As\npart of that effort, we had to drop support for the ability to boot\ninstances with \u0027hw:cpu_thread_policy\u003disolate\u0027 (i.e. I don\u0027t want\nhyperthreads) on hosts with hyperthreading. This had been previously\nimplemented by marking thread siblings of the host cores used by such an\ninstance as reserved and unusable by other instances, but such a design\nwasn\u0027t possible in world where we had to track resource consumption in\nplacement before landing in the host. Instead, the \u0027isolate\u0027 policy now\nsimply means \"give me a host without hyperthreads\". This is enforced by\nhosts with hyperthreads reporting the \u0027HW_CPU_HYPERTHREADING\u0027 trait, and\ninstances with the \u0027isolate\u0027 policy requesting\n\u0027HW_CPU_HYPERTHREADING\u003dforbidden\u0027.\n\nOr at least, that\u0027s how it should work. We also have a fallback query\nfor placement to find hosts with \u0027VCPU\u0027 inventory and that doesn\u0027t care\nabout the \u0027HW_CPU_HYPERTHREADING\u0027 trait. This was envisioned to ensure\nhosts with old style configuration (\u0027[DEFAULT] vcpu_pin_set\u0027) could\ncontinue to be scheduled to. We figured that this second fallback query\ncould accidentally pick up hosts with new-style configuration, but we\nare also tracking the available and used cores from those listed in the\n\u0027[compute] cpu_dedicated_set\u0027 as part of the host \u0027NUMATopology\u0027 objects\n(specifically, via the \u0027pcpuset\u0027 and \u0027cpu_pinning\u0027 fields of the\n\u0027NUMACell\u0027 child objects). These are validated by both the\n\u0027NUMATopologyFilter\u0027 and the virt driver itself, which means hosts with\nnew style configuration that got caught up in this second query would be\nrejected by this filter or by a late failure on the host. (Hint: there\u0027s\nmuch more detail on this in the spec).\n\nUnfortunately we didn\u0027t think about hyperthreading. If a host gets\npicked up in the second request, it might well have enough PCPU\ninventory but simply be rejected in the first query since it had\nhyperthreads. In this case, because it has enough free cores available\nfor pinning, neither the filter nor the virt driver will reject the\nrequest, resulting in a situation whereby the instance ends up falling\nback to the old code paths and consuming $flavor.vcpu host cores, plus\nthe thread siblings for each of these cores. Despite this, it will be\nmarked as consuming $flavor.vcpu VCPU (not PCPU) inventory in placement.\n\nThis patch proves this to be the case, allowing us to resolve the issue\nlater.\n\n[1] https://specs.openstack.org/openstack/nova-specs/specs/train/approved/cpu-resources.html\n\nChange-Id: I87cd4d14192b1a40cbdca6e3af0f818f2cab613e\nSigned-off-by: Stephen Finucane \u003cstephenfin@redhat.com\u003e\nRelated-Bug: #1889633\n(cherry picked from commit 737e0c0111acd364d1481bdabd9d23bc8d5d6a2e)\n(cherry picked from commit 49a793c8ee7a9be26e4e3d6ddd097a6ee6fea29d)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/b60be4a9416cb5b15b7accb99c6e5ecdac40c3c9"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/b60be4a9416cb5b15b7accb99c6e5ecdac40c3c9"}]},"branch":"refs/heads/stable/train"}},"requirements":[],"submit_records":[],"submit_requirements":[]}