system.hugepages: sysctl vm.nr_hugepages

Allow hugepages to be used right away. This is a best effort attempt,
as memory might be too fragmented to free enough contiguous regions
for all hugepages, so early allocation during boot remains the norm.

This allows using ovs-switchd-dpdk without rebooting the node first.

Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

linux/system/hugepages.sls

     - mkmnt: true
     - opts: mode=775,pagesize={{ hugepages.size }}
 
+# Make hugepages available right away with a temporary systctl write
+# This will be handled via krn args after reboot, so don't use `sysctl.present`
+hugepages_sysctl_vm_nr_hugepages:
+  cmd.run:
+    - name: "sysctl vm.nr_hugepages={{ hugepages.count }}"
+    - unless: "sysctl vm.nr_hugepages | grep -qE '{{ hugepages.count }}'"
+
 {%- endif %}
 
 {%- endfor %}