Hugepages support

Grub hugepages configuration and mount point action.

Change-Id: I49b26871c325b95a7d3f264892a9e997b58765bc
Epic: PROD-8959

README.rst

         cpu:
           governor: performance
 
+Huge Pages
+~~~~~~~~~~~~
+
+Huge Pages give a performance boost to applications that intensively deal
+with memory allocation/deallocation by decreasing memory fragmentation.
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        kernel:
+          hugepages:
+            small:
+              size: 2M
+              count: 107520
+              mount_point: /mnt/hugepages_2MB
+              mount: false/true # default false
+            large:
+              default: true # default automatically mounted
+              size: 1G
+              count: 210
+              mount_point: /mnt/hugepages_1GB
+
+Note: not recommended to use both pagesizes in concurrently.
 
 
 Repositories

linux/files/grub_hugepages

+{%- from "linux/map.jinja" import system with context %}
+GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT {%- for hugepages_type, hugepages in system.kernel.hugepages.iteritems() %}{%- if hugepages.get('default', False) %} default_hugepagesz={{ hugepages.size }} {%- endif %} hugepagesz={{ hugepages.size }} hugepages={{ hugepages.count }} {%- endfor %}"

linux/system/hugepages.sls

+{%- from "linux/map.jinja" import system with context %}
+
+{%- if "pse" in grains.cpu_flags or "pdpe1gb" in grains.cpu_flags %}
+
+/etc/default/grub.d/90-hugepages.cfg:
+  file.managed:
+    - source: salt://linux/files/grub_hugepages
+    - template: jinja
+
+{%- for hugepages_type, hugepages in system.kernel.hugepages.iteritems() %}
+
+{%- if hugepages.get('mount', False) or hugepages.get('default', False) %}
+
+hugepages_mount_{{ hugepages_type }}:
+  mount.mounted:
+    - name: {{ hugepages.mount_point }}
+    - device: Hugetlbfs-kvm
+    - fstype: hugetlbfs
+    - mkmnt: true
+    - opts: mode=775,pagesize={{ hugepages.size }}
+
+{%- endif %}
+
+{%- endfor %}
+
+{%- endif %}

linux/system/init.sls

 {%- endif %}
 {%- if system.kernel is defined %}
 - linux.system.kernel
+{%- if system.kernel.hugepages is defined %}
+- linux.system.hugepages
+{%- endif %}
 {%- endif %}
 {%- if system.cpu is defined %}
 - linux.system.cpu
 {%- endif %}
 {%- if system.config is defined %}
 - linux.system.config
-{%- endif %}
+{%- endif %}

tests/pillar/system.sls

         term: xterm
     prompt:
       default: "test01.local$"
+    kernel:
+      hugepages:
+        large:
+          default: true
+          size: 1G
+          count: 210
+          mount_point: /mnt/hugepages_1GB
     motd:
       - warning: |
           #!/bin/sh