Add playbook to set SMT on worker nodes

Author: kishen-v

kubetest2-tf/data/k8s-ansible/group_vars/masters

@@ -1,2 +1,3 @@
 ---
-node_type: master
+node_type: master
+smt_level: 8

kubetest2-tf/data/k8s-ansible/group_vars/workers

@@ -1,2 +1,3 @@
 ---
-node_type: worker
+node_type: worker
+smt_level: 4

kubetest2-tf/data/k8s-ansible/install-k8s-ha.yml

@@ -22,6 +22,13 @@
     - download-k8s
     - install-k8s
 
+- name: Set desired SMT levels on nodes
+  hosts:
+    - masters
+    - workers
+  roles:
+    - set-smt
+
 - name: Install networking - calico
   hosts: masters
   roles:

kubetest2-tf/data/k8s-ansible/patch-nodes.yaml

@@ -3,7 +3,7 @@
     - masters
     - workers
   roles:
-    - role: update-node-os
+    - update-node-os
 
 - name: Reboot Kubernetes nodes one-by-one
   hosts:
@@ -12,4 +12,11 @@
   serial: 1
   become: yes
   roles:
-    - role: reboot-sequentially
+    - reboot-sequentially
+
+- name: Set desired SMT levels on nodes
+  hosts:
+    - masters
+    - workers
+  roles:
+    - set-smt

kubetest2-tf/data/k8s-ansible/roles/set-smt/tasks/main.yml

@@ -0,0 +1,17 @@
+- name: Resolve Kubernetes node name from inventory IP
+  shell: |
+    kubectl get nodes -o jsonpath="{range .items[*]}{.metadata.name} {.status.addresses[?(@.type=='InternalIP')].address}{'\n'}{end}" \
+    --kubeconfig {{ kubeconfig_path }} | grep {{ inventory_hostname }} | awk '{print $1}'
+  register: node_name
+  delegate_to: "{{ groups['masters'][0] }}"
+
+- name: Add SMT level label to node
+  shell: |
+    kubectl label node/{{ node_name.stdout }} feature.node.kubernetes.io/ppc64le.smtlevel="{{ smt_level }}" --overwrite
+  delegate_to: "{{ groups['masters'][0] }}"
+
+- name: Set SMT level
+  shell: ppc64_cpu --smt={{ smt_level }}
+
+- name: Restart kubelet to update the node's capacity at the cluster level
+  shell: systemctl restart kubelet