functions: added cpulist_present

This function filters the input cpulist against CPUs present on the
system. It returns unpacked list.

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>

tuned/profiles/functions/function_cpulist_present.py

@@ -0,0 +1,22 @@
+import os
+import tuned.logs
+import base
+from tuned.utils.commands import commands
+
+log = tuned.logs.get()
+
+class cpulist_online(base.Function):
+	"""
+	Checks whether CPUs from list are present, returns list containing
+	only present CPUs
+	"""
+	def __init__(self):
+		# arbitrary number of arguments
+		super(self.__class__, self).__init__("cpulist_present", 0)
+
+	def execute(self, args):
+		if not super(self.__class__, self).execute(args):
+			return None
+		cpus = self._cmd.cpulist_unpack(",,".join(args))
+		present = self._cmd.cpulist_unpack(self._cmd.read_file("/sys/devices/system/cpu/present"))
+		return ",".join(str(v) for v in set(cpus).intersection(set(present)))