Fix hugepages node config

modules/configuring-huge-pages.adoc

@@ -1,3 +1,7 @@
+// Module included in the following assemblies:
+//
+// * scalability_and_performance/what-huge-pages-do-and-how-they-are-consumed-by-apps.adoc
+
 [id="configuring-huge-pages_{context}"]
 = Configuring huge pages
 
@@ -10,46 +14,53 @@ Node Tuning Operator to allocate huge pages on a specific node.
 tuned profile, which describes how many huge pages should be allocated:
 +
 ----
-$ oc label node <node-using-hugepages> hugepages=true
+$ oc label node <node_using_hugepages> hugepages=true
 ----
 
-. Create a tuned profile for this specific node and allocate some huge pages. To
-associate the profile to the correct node, edit the tuned resource and add a
-`profile` and `match` section:
+. Create a file with the following content and name it `hugepages_tuning.yaml`:
 +
 ----
-$ oc edit tuned
-----
+apiVersion: tuned.openshift.io/v1
+kind: Tuned
+metadata:
+  name: hugepages <1>
+  namespace: openshift-cluster-node-tuning-operator
+spec:
+  profile: <2>
+  - data: |
+      [main]
+      summary=Configuration for hugepages
+      include=openshift-node
 
-.. In the `profile` section, add the following tuned profile for allocating huge
-pages:
+      [vm]
+      transparent_hugepages=never
+
+      [sysctl]
+      vm.nr_hugepages=1024
+    name: node-hugepages
+  recommend:
+  - match: <3>
+    - label: hugepages
+    priority: 30
+    profile: node-hugepages
+----
+<1> Set the `name` parameter value to `hugepages`.
+<2> Set the `profile` section to allocate huge pages.
+<3> Set the `match` section to associate the profile to nodes with the `hugepages` label.
+
+. Create the custom `hugepages` tuned profile by using the `hugepages_tuning.yaml` file:
 +
 ----
-- data: |
-    [main]
-    summary=Configuration for hugepages
-    include=openshift-node
-    [vm]
-    transparent_hugepages=never
-    [sysctl]
-    vm.nr_hugepages=1024
+$ oc create -f hugepages_tuning.yaml
 ----
 
-.. To apply the profile to the correct node, add the following to the `match`
-section:
+. After creating the profile, the Operator applies the new profile to the correct
+node and allocates huge pages. Check the logs of a tuned pod on a node using
+huge pages to verify:
 +
 ----
- - match:
-   - label: hugepages
-   priority: 30
-   profile: hugepages
-----
-
-The Operator applies the new profile to the correct node and allocates huge
-pages:
+$ oc logs <tuned_pod_on_node_using_hugepages> \
+    -n openshift-cluster-node-tuning-operator | grep 'applied$' | tail -n1
 
-----
-2019-04-30 13:38:26,831 INFO  tuned.plugins.plugin_sysctl: reapplying system sysctl
-2019-04-30 13:38:26,837 INFO  tuned.daemon.daemon: static tuning from profile 'hugepages' applied
-2019-04-30 13:38:26,845 INFO  tuned.daemon.daemon: terminating Tuned
+2019-08-08 07:20:41,286 INFO     tuned.daemon.daemon: static tuning from profile 'node-hugepages' applied
 ----