From: peusterm <manuel.peuster@uni-paderborn.de>
Date: Mon, 18 Apr 2016 15:37:19 +0000 (+0200)
Subject: Cleanup of RM model.
X-Git-Tag: v3.1~140^2~2^2~3
X-Git-Url: https://osm.etsi.org/gitweb/?p=osm%2Fvim-emu.git;a=commitdiff_plain;h=3b9527f59c16a29d4fe0c74565a5ac82a21aed3a

Cleanup of RM model.
---

diff --git a/src/emuvim/dcemulator/resourcemodel/upb/simple.py b/src/emuvim/dcemulator/resourcemodel/upb/simple.py
index 6cc1687..1b2f4a3 100644
--- a/src/emuvim/dcemulator/resourcemodel/upb/simple.py
+++ b/src/emuvim/dcemulator/resourcemodel/upb/simple.py
@@ -9,6 +9,8 @@ from emuvim.dcemulator.resourcemodel import BaseResourceModel
 LOG = logging.getLogger("rm.upb.simple")
 LOG.setLevel(logging.DEBUG)
 
+CPU_PERIOD = 1000000
+
 
 class UpbSimpleCloudDcRM(BaseResourceModel):
     """
@@ -130,20 +132,29 @@ class UpbSimpleCloudDcRM(BaseResourceModel):
         self.single_cu = float(e_cpu) / sum([rm.dc_max_cu for rm in list(self.registrar.resource_models)])
         # calculate cpu time fraction for container with given flavor
         cpu_time_percentage = self.single_cu * number_cu
-        # calculate cpu period and quota for CFS
+        # calculate input values for CFS scheduler bandwidth limitation
+        cpu_period, cpu_quota = self._calculate_cpu_cfs_values(cpu_time_percentage)
+        # apply limits to container if changed
+        if d.cpu_period != cpu_period or d.cpu_quota != cpu_quota:
+            LOG.debug("Setting CPU limit for %r: cpu_quota = cpu_period * limit = %f * %f = %f" % (
+                      d.name, cpu_period, cpu_time_percentage, cpu_quota))
+            d.updateCpuLimit(cpu_period=int(cpu_period), cpu_quota=int(cpu_quota))
+
+    def _calculate_cpu_cfs_values(self, cpu_time_percentage):
+        """
+        Calculate cpu period and quota for CFS
+        :param cpu_time_percentage: percentage of overall CPU to be used
+        :return: cpu_period, cpu_quota
+        """
         # (see: https://www.kernel.org/doc/Documentation/scheduler/sched-bwc.txt)
         # Attention minimum cpu_quota is 1ms (micro)
-        cpu_period = 1000000  # lets consider a fixed period of 1000000 microseconds for now
+        cpu_period = CPU_PERIOD  # lets consider a fixed period of 1000000 microseconds for now
         cpu_quota = cpu_period * cpu_time_percentage  # calculate the fraction of cpu time for this container
         # ATTENTION >= 1000 to avoid a invalid argument system error ... no idea why
         if cpu_quota < 1000:
             cpu_quota = 1000
             LOG.warning("Increased CPU quota for %r to avoid system error." % d.name)
-        # apply to container if changed
-        if d.cpu_period != cpu_period or d.cpu_quota != cpu_quota:
-            LOG.debug("Setting CPU limit for %r: cpu_quota = cpu_period * limit = %f * %f = %f" % (
-                      d.name, cpu_period, cpu_time_percentage, cpu_quota))
-            d.updateCpuLimit(cpu_period=int(cpu_period), cpu_quota=int(cpu_quota))
+        return cpu_period, cpu_quota
 
     def _apply_mem_limits(self, d):
         """
@@ -158,16 +169,24 @@ class UpbSimpleCloudDcRM(BaseResourceModel):
         self.single_mu = float(e_mem) / sum([rm.dc_max_mu for rm in list(self.registrar.resource_models)])
         # calculate mem for given flavor
         mem_limit = self.single_mu * number_mu
+        mem_limit = self._calculate_mem_limit_value(mem_limit)
+        # apply to container if changed
+        if d.mem_limit != mem_limit:
+            LOG.debug("Setting MEM limit for %r: mem_limit = %f MB" % (d.name, mem_limit/1024/1024))
+            d.updateMemoryLimit(mem_limit=mem_limit)
+
+    def _calculate_mem_limit_value(self, mem_limit):
+        """
+        Calculate actual mem limit as input for cgroup API
+        :param mem_limit: abstract mem limit
+        :return: concrete mem limit
+        """
         # ATTENTION minimum mem_limit per container is 4MB
         if mem_limit < 4:
             mem_limit = 4
             LOG.warning("Increased MEM limit for %r because it was less than 4.0 MB." % d.name)
         # to byte!
-        mem_limit = int(mem_limit*1024*1024)
-        # apply to container if changed
-        if d.mem_limit != mem_limit:
-            LOG.debug("Setting MEM limit for %r: mem_limit = %f MB" % (d.name, mem_limit/1024/1024))
-            d.updateMemoryLimit(mem_limit=mem_limit)
+        return int(mem_limit*1024*1024)
 
     def get_state_dict(self):
         """