OPS-966 - disable transparent hugepages

playbooks/roles/mongo_3_0/files/disable-transparent-hugepages

+#!/bin/sh
+### BEGIN INIT INFO
+# Provides:          disable-transparent-hugepages
+# Required-Start:    $local_fs
+# Required-Stop:
+# X-Start-Before:    mongod mongodb-mms-automation-agent
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Disable Linux transparent huge pages
+# Description:       Disable Linux transparent huge pages, to improve
+#                    database performance.
+### END INIT INFO
+
+case $1 in
+  start)
+    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
+      thp_path=/sys/kernel/mm/transparent_hugepage
+    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
+      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
+    else
+      return 0
+    fi
+
+    echo 'never' > ${thp_path}/enabled
+    echo 'never' > ${thp_path}/defrag
+
+    unset thp_path
+    ;;
+  stop)
+    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
+      thp_path=/sys/kernel/mm/transparent_hugepage
+    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
+      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
+    else
+      return 0
+    fi
+
+    echo 'always' > ${thp_path}/enabled
+    echo 'always' > ${thp_path}/defrag
+
+    unset thp_path
+    ;;
+  status)
+    if [ -d /sys/kernel/mm/transparent_hugepage ]; then
+      thp_path=/sys/kernel/mm/transparent_hugepage
+    elif [ -d /sys/kernel/mm/redhat_transparent_hugepage ]; then
+      thp_path=/sys/kernel/mm/redhat_transparent_hugepage
+    else
+      return 0
+    fi
+
+    case $(cat ${thp_path}/enabled | sed -e 's/.*\[//' -e 's/\].*//') in
+      always)
+        echo "always"
+        return 1
+        ;;
+      madvise)
+        echo "madvise"
+        return 1
+        ;;
+      never)
+        echo "never"
+        return 0
+        ;;
+    esac
+    unset thp_path
+    ;;
+esac

playbooks/roles/mongo_3_0/tasks/main.yml

@@ -22,7 +22,21 @@
     state=absent purge=yes
     force=yes
   when: mongodb_needs_upgrade.stat.exists and not MONGO_CLUSTERED
-  
+
+- name: disable transparent huge pages on startup (http://docs.mongodb.org/manual/tutorial/transparent-huge-pages/)
+  copy: >
+    src=disable-transparent-hugepages
+    dest=/etc/init.d/disable-transparent-hugepages
+    owner=root
+    group=root
+    mode=0755
+
+- name: disable transparent huge pages
+  service: >
+    name=disable-transparent-hugepages
+    enabled=yes
+    state=started
+
 - name: install python pymongo for mongo_user ansible module
   pip: >
     name=pymongo state=present