Implement isolcpu grub configuration

Separate cpu for host os from workload.

Change-Id: I5b274a6324fe2fa47c09df82c01e3b95dadb5e53
Epic: PROD-8959

README.rst

@@ -288,6 +288,20 @@ PCI-SIG Single Root I/O Virtualization and Sharing (SR-IOV) specification define
             echo 7 > /sys/class/net/eth1/device/sriov_numvfs; sleep 2; ifup -a
             exit 0
 
+Isolate CPU options
+~~~~~~~~~~~~~~~~~~~
+
+Remove the specified CPUs, as defined by the cpu_number values, from the general kernel
+SMP balancing and scheduler algroithms. The only way to move a process onto or off an
+"isolated" CPU is via the CPU affinity syscalls. cpu_number begins at 0, so the
+maximum value is 1 less than the number of CPUs on the system.
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        kernel:
+          isolcpu: 1,2,3,4,5,6,7 # isolate first cpu 0
 
 Repositories
 ~~~~~~~~~~~~

linux/system/kernel.sls

@@ -3,6 +3,21 @@
 
 {%- if system.kernel is defined %}
 
+{%- if system.kernel.isolcpu is defined %}
+
+include:
+  - linux.system.grub
+
+/etc/default/grub.d/90-isolcpu.cfg:
+  file.managed:
+    - contents: 'GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT isolcpu={{ system.kernel.isolcpu }}"'
+    - require:
+      - file: grub_d_directory
+    - watch_in:
+      - cmd: grub_update
+
+{%- endif %}
+
 {%- if system.kernel.version is defined %}
 
 linux_kernel_package:

tests/pillar/system.sls

@@ -20,6 +20,8 @@ linux:
     prompt:
       default: "test01.local$"
     kernel:
+      sriov: True
+      isolcpu: 1,2,3,4
       hugepages:
         large:
           default: true