[new] cgroup_common.py
* library for handling cgroups
Signed-off-by: Lukas Doktor <ldoktor@xxxxxxxxxx>
---
client/tests/cgroup/cgroup.py | 5 +-
client/tests/cgroup/cgroup_common.py | 327 ++++++++++++++++++++++++++++++++++
2 files changed, 331 insertions(+), 1 deletions(-)
create mode 100755 client/tests/cgroup/cgroup_common.py
diff --git a/client/tests/cgroup/cgroup.py b/client/tests/cgroup/cgroup.py
index d043d65..112f012 100755
--- a/client/tests/cgroup/cgroup.py
+++ b/client/tests/cgroup/cgroup.py
@@ -118,6 +118,7 @@ class cgroup(test.test):
# Fill the memory without cgroup limitation
# Should pass
################################################
+ logging.debug("test_memory: Memfill WO cgroup")
ps = item.test("memfill %d" % mem)
ps.stdin.write('\n')
i = 0
@@ -141,6 +142,7 @@ class cgroup(test.test):
# memsw: should swap out part of the process and pass
# WO memsw: should fail (SIGKILL)
################################################
+ logging.debug("test_memory: Memfill mem only limit")
ps = item.test("memfill %d" % mem)
if item.set_cgroup(ps.pid, pwd):
logging.error("test_memory: Could not set cgroup")
@@ -187,6 +189,7 @@ class cgroup(test.test):
# Fill the memory with 1/2 memory+swap limit
# Should fail
################################################
+ logging.debug("test_memory: Memfill mem + swap limit")
if memsw:
ps = item.test("memfill %d" % mem)
if item.set_cgroup(ps.pid, pwd):
@@ -226,11 +229,11 @@ class cgroup(test.test):
logging.debug("test_memory: Memfill mem+swap cgroup passed")
# cleanup
+ logging.debug("test_memory: Cleanup")
if item.rm_cgroup(pwd):
logging.error("test_memory: Can't remove cgroup directory")
return -1
os.system("swapon -a")
- logging.debug("test_memory: Cleanup passed")
logging.info("Leaving 'test_memory': PASSED")
return 0
diff --git a/client/tests/cgroup/cgroup_common.py b/client/tests/cgroup/cgroup_common.py
new file mode 100755
index 0000000..3fd1cf7
--- /dev/null
+++ b/client/tests/cgroup/cgroup_common.py
@@ -0,0 +1,327 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+"""
+Helpers for cgroup testing
+
+@copyright: 2011 Red Hat Inc.
+@author: Lukas Doktor <ldoktor@xxxxxxxxxx>
+"""
+import os, logging
+import subprocess
+from tempfile import mkdtemp
+import time
+
+class Cgroup:
+ """
+ Cgroup handling class
+ """
+ def __init__(self, module, _client):
+ """
+ Constructor
+ @param module: Name of the cgroup module
+ @param _client: Test script pwd+name
+ """
+ self.module = module
+ self._client = _client
+ self.root = None
+
+
+ def initialize(self, modules):
+ """
+ Inicializes object for use
+ @param modules: array of all available cgroup modules
+ @return: 0 when PASSED
+ """
+ self.root = modules.get_pwd(self.module)
+ if self.root:
+ return 0
+ else:
+ logging.error("cg.initialize(): Module %s not found", self.module)
+ return -1
+ return 0
+
+
+ def mk_cgroup(self, root=None):
+ """
+ Creates new temporary cgroup
+ @param root: where to create this cgroup (default: self.root)
+ @return: 0 when PASSED
+ """
+ try:
+ if root:
+ pwd = mkdtemp(prefix='cgroup-', dir=root) + '/'
+ else:
+ pwd = mkdtemp(prefix='cgroup-', dir=self.root) + '/'
+ except Exception, inst:
+ logging.error("cg.mk_cgroup(): %s" , inst)
+ return None
+ return pwd
+
+
+ def rm_cgroup(self, pwd, supress=False):
+ """
+ Removes cgroup
+ @param pwd: cgroup directory
+ @param supress: supress output
+ @return: 0 when PASSED
+ """
+ try:
+ os.rmdir(pwd)
+ except Exception, inst:
+ if not supress:
+ logging.error("cg.rm_cgroup(): %s" , inst)
+ return -1
+ return 0
+
+
+ def test(self, cmd):
+ """
+ Executes cgroup_client.py with cmd parameter
+ @param cmd: command to be executed
+ @return: subprocess.Popen() process
+ """
+ logging.debug("cg.test(): executing paralel process '%s'" , cmd)
+ process = subprocess.Popen((self._client + ' ' + cmd), shell=True,
+ stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE, close_fds=True)
+ return process
+
+
+ def is_cgroup(self, pid, pwd):
+ """
+ Checks if the 'pid' process is in 'pwd' cgroup
+ @param pid: pid of the process
+ @param pwd: cgroup directory
+ @return: 0 when is 'pwd' member
+ """
+ if open(pwd+'/tasks').readlines().count("%d\n" % pid) > 0:
+ return 0
+ else:
+ return -1
+
+ def is_root_cgroup(self, pid):
+ """
+ Checks if the 'pid' process is in root cgroup (WO cgroup)
+ @param pid: pid of the process
+ @return: 0 when is 'root' member
+ """
+ return self.is_cgroup(pid, self.root)
+
+ def set_cgroup(self, pid, pwd):
+ """
+ Sets cgroup membership
+ @param pid: pid of the process
+ @param pwd: cgroup directory
+ @return: 0 when PASSED
+ """
+ try:
+ open(pwd+'/tasks', 'w').write(str(pid))
+ except Exception, inst:
+ logging.error("cg.set_cgroup(): %s" , inst)
+ return -1
+ if self.is_cgroup(pid, pwd):
+ logging.error("cg.set_cgroup(): Setting %d pid into %s cgroup "
+ "failed", pid, pwd)
+ return -1
+ else:
+ return 0
+
+ def set_root_cgroup(self, pid):
+ """
+ Resets the cgroup membership (sets to root)
+ @param pid: pid of the process
+ @return: 0 when PASSED
+ """
+ return self.set_cgroup(pid, self.root)
+
+
+ def get_property(self, prop, pwd=None, supress=False):
+ """
+ Gets the property value
+ @param prop: property name (file)
+ @param pwd: cgroup directory
+ @param supress: supress the output
+ @return: String value or None when FAILED
+ """
+ if pwd == None:
+ pwd = self.root
+ try:
+ ret = open(pwd+prop, 'r').readlines()
+ except Exception, inst:
+ ret = None
+ if not supress:
+ logging.error("cg.get_property(): %s" , inst)
+ return ret
+
+
+ def set_property(self, prop, value, pwd=None, check=True):
+ """
+ Sets the property value
+ @param prop: property name (file)
+ @param value: desired value
+ @param pwd: cgroup directory
+ @param check: check the value after setup
+ @return: 0 when PASSED
+ """
+ value = str(value)
+ if pwd == None:
+ pwd = self.root
+ try:
+ open(pwd+prop, 'w').write(value)
+ except Exception, inst:
+ logging.error("cg.set_property(): %s" , inst)
+ return -1
+ if check:
+ # Get the first line - '\n'
+ _value = self.get_property(prop, pwd)[0][:-1]
+ if value != _value:
+ logging.error("cg.set_property(): Setting failed: desired = %s,"
+ " real value = %s", value, _value)
+ return -1
+ return 0
+
+
+ def smoke_test(self):
+ """
+ Smoke test
+ Module independent basic tests
+ """
+ part = 0
+ pwd = self.mk_cgroup()
+ if pwd == None:
+ logging.error("cg.smoke_test[%d]: Can't create cgroup", part)
+ return -1
+
+ part += 1
+ ps = self.test("smoke")
+ if ps == None:
+ logging.error("cg.smoke_test[%d]: Couldn't create process", part)
+ return -1
+
+ part += 1
+ if (ps.poll() != None):
+ logging.error("cg.smoke_test[%d]: Process died unexpectidly", part)
+ return -1
+
+ # New process should be a root member
+ part += 1
+ if self.is_root_cgroup(ps.pid):
+ logging.error("cg.smoke_test[%d]: Process is not a root member",
+ part)
+ return -1
+
+ # Change the cgroup
+ part += 1
+ if self.set_cgroup(ps.pid, pwd):
+ logging.error("cg.smoke_test[%d]: Could not set cgroup", part)
+ return -1
+
+ # Try to remove used cgroup
+ part += 1
+ if self.rm_cgroup(pwd, supress=True) == 0:
+ logging.error("cg.smoke_test[%d]: Unexpected successful deletion of"
+ " the used cgroup", part)
+ return -1
+
+ # Return the process into the root cgroup
+ part += 1
+ if self.set_root_cgroup(ps.pid):
+ logging.error("cg.smoke_test[%d]: Could not return the root cgroup "
+ "membership", part)
+ return -1
+
+ # It should be safe to remove the cgroup now
+ part += 1
+ if self.rm_cgroup(pwd):
+ logging.error("cg.smoke_test[%d]: Can't remove cgroup direcotry",
+ part)
+ return -1
+
+ # Finish the process
+ part += 1
+ ps.stdin.write('\n')
+ time.sleep(2)
+ if (ps.poll() == None):
+ logging.error("cg.smoke_test[%d]: Process is not finished", part)
+ return -1
+
+ return 0
+
+
+class CgroupModules:
+ """
+ Handles the list of different cgroup filesystems
+ """
+ def __init__(self):
+ self.modules = []
+ self.modules.append([])
+ self.modules.append([])
+ self.modules.append([])
+ self.mountdir = mkdtemp(prefix='cgroup-') + '/'
+
+
+ def init(self, _modules):
+ """
+ Checks the mounted modules and if necessarily mounts them into tmp
+ mountdir.
+ @param _modules: desired modules
+ @return: Number of initialized modules
+ """
+ mounts = []
+ fp = open('/proc/mounts', 'r')
+ line = fp.readline().split()
+ while line:
+ if line[2] == 'cgroup':
+ mounts.append(line)
+ line = fp.readline().split()
+ fp.close()
+
+ for module in _modules:
+ # Is it already mounted?
+ i = False
+ for mount in mounts:
+ if mount[3].find(module) != -1:
+ self.modules[0].append(module)
+ self.modules[1].append(mount[1]+'/')
+ self.modules[2].append(False)
+ i = True
+ break
+
+ if not i:
+ # Not yet mounted
+ os.mkdir(self.mountdir+module)
+ logging.info('mount -t cgroup -o %s %s %s', module, module,
+ self.mountdir+module)
+ if (os.system('mount -t cgroup -o %s %s %s'
+ % (module, module, self.mountdir+module)) == 0):
+ self.modules[0].append(module)
+ self.modules[1].append(self.mountdir+module)
+ self.modules[2].append(True)
+ else:
+ logging.error("Module '%s' is not available, mount failed",
+ module)
+ return len(self.modules[0])
+
+
+ def cleanup(self):
+ """
+ Unmount all cgroups and remove the mountdir
+ """
+ for i in range(len(self.modules[0])):
+ if self.modules[2][i]:
+ os.system('umount %s -l' % self.modules[1][i])
+ os.system('rm -rf %s' % self.mountdir)
+
+
+ def get_pwd(self, module):
+ """
+ Returns the mount directory of 'module'
+ @param module: desired module (memory, ...)
+ @return: mount directory of 'module' or None
+ """
+ try:
+ i = self.modules[0].index(module)
+ except Exception, inst:
+ logging.error("module %s not found: %s", module, inst)
+ return None
+ return self.modules[1][i]
--
1.7.6
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