ansible: add role to install Linux perf on Ubuntu

Ansible role to install Linux perf on Ubuntu by cloning the Linux source
code and building tools/perf to avoid Kernel mismatch errors.

PR-URL: #1231
Ref: #1274
Reviewed-By: Jon Moss <me@jonathanmoss.me>

ansible/playbooks/jenkins/worker/create.yml

@@ -54,4 +54,13 @@
     - release-joyent-ubuntu1604_arm_cross-x64-1
 
   roles:
-    - cross-compiler
+    - cross-compiler
+
+#
+# Install Linux perf on Ubuntu 16.04 servers
+#
+
+- hosts:
+    - test-*-ubuntu1604-x*
+  roles:
+    - linux-perf

ansible/roles/linux-perf/tasks/main.yml

@@ -0,0 +1,46 @@
+---
+
+#
+# installs Linux perf @ /usr/local/bin/perf
+#
+
+- stat:
+    path: /usr/local/bin/perf
+  register: linux_perf
+  tags: linux_perf
+
+- name: install perf on linux
+  tags: linux_perf
+  when: not (linux_perf.stat.exists | bool)
+  block:
+    - name: Clean path
+      file:
+        state: absent
+        path: "{{ tmp_folder }}"
+
+    - name: Download Linux source code
+      git:
+        repo: https://github.com/torvalds/linux.git
+        depth: 1
+        dest: "{{ tmp_folder }}/linux"
+
+    - name: Install packages
+      package:
+        name: "{{ package }}"
+        state: present
+      loop_control:
+        loop_var: package
+      with_items: "{{ packages }}"
+
+    - name: build Linux perf
+      shell: make -j{{ ansible_processor_cores | default(1) }}
+      args:
+        chdir: "{{ tmp_folder }}/linux/tools/perf"
+
+    - name: install Linux perf
+      shell: "cp {{ tmp_folder }}/linux/tools/perf/perf /usr/local/bin/perf"
+
+    - name: Clean path
+      file:
+        state: absent
+        path: "{{ tmp_folder }}"

ansible/roles/linux-perf/vars/main.yml

@@ -0,0 +1,6 @@
+---
+packages:
+  - build-essential
+  - flex
+  - bison
+tmp_folder: /data/tmp