This subtest tests the 'freezer.state' cgroup functionality. It assignes the
virtual machine into freezer cgroup, schedule cpu-intensive work and verifies
the correct function in both states (frozen/thawed) during long and short
period of time.
* Adds TestFreezer (freezer) test
* Adds assign_vm_into_cgroup() function
* Code cleanup
Signed-off-by: Lukas Doktor <ldoktor@xxxxxxxxxx>
---
client/tests/cgroup/cgroup_common.py | 16 +---
client/tests/kvm/tests/cgroup.py | 158 +++++++++++++++++++++++++++++++---
2 files changed, 145 insertions(+), 29 deletions(-)
diff --git a/client/tests/cgroup/cgroup_common.py b/client/tests/cgroup/cgroup_common.py
index 0c86398..7d5daf2 100755
--- a/client/tests/cgroup/cgroup_common.py
+++ b/client/tests/cgroup/cgroup_common.py
@@ -6,25 +6,11 @@ Helpers for cgroup testing.
@copyright: 2011 Red Hat Inc.
@author: Lukas Doktor <ldoktor@xxxxxxxxxx>
"""
-import logging, os, shutil, subprocess, time, traceback
+import logging, os, shutil, subprocess, time
from tempfile import mkdtemp
from autotest_lib.client.bin import utils
from autotest_lib.client.common_lib import error
-def _traceback(name, exc_info):
- """
- Formats traceback into lines "name: line\nname: line"
- @param name: desired line preposition
- @param exc_info: sys.exc_info of the exception
- @return: string which contains beautifully formatted exception
- """
- out = "\n"
- for line in traceback.format_exception(exc_info[0], exc_info[1],
- exc_info[2]):
- out += "%s: %s" % (name, line)
- return out
-
-
class Cgroup(object):
"""
Cgroup handling class.
diff --git a/client/tests/kvm/tests/cgroup.py b/client/tests/kvm/tests/cgroup.py
index f31ef0c..fd36f9a 100644
--- a/client/tests/kvm/tests/cgroup.py
+++ b/client/tests/kvm/tests/cgroup.py
@@ -40,6 +40,20 @@ def run_cgroup(test, params, env):
raise error.TestFail("WM [%s] had to be recreated" % err[:-2])
+ def assign_vm_into_cgroup(vm, cgroup, pwd=None):
+ """
+ Assigns all threads of VM into cgroup
+ @param vm: desired VM
+ @param cgroup: cgroup handler
+ @param pwd: desired cgroup's pwd, cgroup index or None for root cgroup
+ """
+ if isinstance(pwd, int):
+ pwd = cgroup.cgroups[pwd]
+ cgroup.set_cgroup(vm.get_shell_pid(), pwd)
+ for pid in utils.get_children_pids(vm.get_shell_pid()):
+ cgroup.set_cgroup(int(pid), pwd)
+
+
def distance(actual, reference):
"""
Absolute value of relative distance of two numbers
@@ -118,10 +132,12 @@ def run_cgroup(test, params, env):
utils.system("dd if=/dev/zero of=%s bs=1M count=8 &>/dev/null"
% (host_file.name))
ret_file = host_file
- logging.debug("add_file_drive: new file %s as drive", host_file.name)
+ logging.debug("add_file_drive: new file %s as drive",
+ host_file.name)
else:
ret_file = None
- logging.debug("add_file_drive: using file %s as drive", host_file.name)
+ logging.debug("add_file_drive: using file %s as drive",
+ host_file.name)
out = vm.monitor.cmd("pci_add auto storage file=%s,if=%s,snapshot=off,"
"cache=off" % (host_file.name, driver))
@@ -277,10 +293,7 @@ def run_cgroup(test, params, env):
blkio.initialize(self.modules)
for i in range(2):
pwd.append(blkio.mk_cgroup())
- blkio.set_cgroup(self.vms[i].get_shell_pid(), pwd[i])
- # Move all existing threads into cgroup
- for tmp in utils.get_children_pids(self.vms[i].get_shell_pid()):
- blkio.set_cgroup(int(tmp), pwd[i])
+ assign_vm_into_cgroup(self.vms[i], blkio, pwd[i])
self.blkio.set_property("blkio.weight", 100, pwd[0])
self.blkio.set_property("blkio.weight", 1000, pwd[1])
@@ -475,9 +488,7 @@ def run_cgroup(test, params, env):
for i in range(len(self.cgroups)):
logging.info("Limiting speed to: %s", (self.speeds[i]))
# Assign all threads of vm
- self.cgroup.set_cgroup(self.vm.get_shell_pid(), self.cgroups[i])
- for pid in utils.get_children_pids(self.vm.get_shell_pid()):
- self.cgroup.set_cgroup(int(pid), self.cgroups[i])
+ assign_vm_into_cgroup(self.vm, self.cgroup, self.cgroups[i])
# Standard test-time is 60s. If the slice time is less than 30s,
# test-time is prolonged to 30s per slice.
@@ -668,10 +679,7 @@ def run_cgroup(test, params, env):
self.cgroup.initialize(self.modules)
self.cgroup.mk_cgroup()
- self.cgroup.set_cgroup(self.vm.get_shell_pid(),
- self.cgroup.cgroups[0])
- for pid in utils.get_children_pids(self.vm.get_shell_pid()):
- self.cgroup.set_cgroup(int(pid), self.cgroup.cgroups[0])
+ assign_vm_into_cgroup(self.vm, self.cgroup, 0)
# Test dictionary
# Beware of persistence of some setting to another round!!!
@@ -765,6 +773,127 @@ def run_cgroup(test, params, env):
return ("All restrictions enforced successfully.")
+
+ class TestFreezer:
+ """
+ Tests the freezer.state cgroup functionality. (it freezes the guest
+ and unfreeze it again)
+ """
+ def __init__(self, vms, modules):
+ """
+ Initialization
+ @param vms: list of vms
+ @param modules: initialized cgroup module class
+ """
+ self.vm = vms[0] # Virt machines
+ self.modules = modules # cgroup module handler
+ self.cgroup = Cgroup('freezer', '') # cgroup blkio handler
+ self.files = None # Temporary files (files of virt disks)
+ self.devices = None # Temporary virt devices
+
+
+ def cleanup(self):
+ """ Cleanup """
+ err = ""
+ try:
+ self.cgroup.set_property('freezer.state', 'THAWED',
+ self.cgroup.cgroups[0])
+ except Exception, failure_detail:
+ err += "\nCan't unfreeze vm: %s" % failure_detail
+
+ try:
+ _ = self.vm.wait_for_login(timeout=30)
+ _.cmd('rm -f /tmp/freeze-lock')
+ _.close()
+ except Exception, failure_detail:
+ err += "\nCan't stop the stresses."
+
+ try:
+ del(self.cgroup)
+ except Exception, failure_detail:
+ err += "\nCan't remove Cgroup: %s" % failure_detail
+
+ if err:
+ logging.error("Some cleanup operations failed: %s", err)
+ raise error.TestFail("Some cleanup operations failed: %s" %
+ err)
+
+
+ def init(self):
+ """
+ Initialization
+ * prepares one cgroup and assign vm to it
+ """
+ self.cgroup.initialize(self.modules)
+ self.cgroup.mk_cgroup()
+ assign_vm_into_cgroup(self.vm, self.cgroup, 0)
+
+
+ def run(self):
+ """
+ Actual test:
+ * Freezes the guest and thaws it again couple of times
+ * verifies that guest is frozen and runs when expected
+ """
+ def get_stat(pid):
+ """
+ Gather statistics of pid+1st level subprocesses cpu usage
+ @param pid: PID of the desired process
+ @return: sum of all cpu-related values of 1st level subprocesses
+ """
+ out = None
+ for i in range(10):
+ try:
+ out = utils.system_output("cat /proc/%s/task/*/stat" %
+ pid)
+ except error.CmdError:
+ out = None
+ else:
+ break
+ out = out.split('\n')
+ ret = 0
+ for i in out:
+ ret += sum([int(_) for _ in i.split(' ')[13:17]])
+ return ret
+
+
+ session = self.vm.wait_for_serial_login(timeout=30)
+ session.cmd('touch /tmp/freeze-lock')
+ session.sendline('while [ -e /tmp/freeze-lock ]; do :; done')
+ cgroup = self.cgroup
+ pid = self.vm.get_pid()
+
+ for tsttime in [0.5, 3, 20]:
+ # Let it work for short, mid and long period of time
+ logging.info("FREEZING (%ss)", tsttime)
+ # Death line for freezing is 1s
+ cgroup.set_property('freezer.state', 'FROZEN',
+ cgroup.cgroups[0], check=False)
+ time.sleep(1)
+ _ = cgroup.get_property('freezer.state', cgroup.cgroups[0])
+ if 'FROZEN' not in _:
+ raise error.TestFail("Couldn't freeze the VM: state %s" % _)
+ stat_ = get_stat(pid)
+ time.sleep(tsttime)
+ stat = get_stat(pid)
+ if stat != stat_:
+ raise error.TestFail('Process was running in FROZEN state; '
+ 'stat=%s, stat_=%s, diff=%s' %
+ (stat, stat_, stat-stat_))
+ logging.info("THAWING (%ss)", tsttime)
+ self.cgroup.set_property('freezer.state', 'THAWED',
+ self.cgroup.cgroups[0])
+ stat_ = get_stat(pid)
+ time.sleep(tsttime)
+ stat = get_stat(pid)
+ if (stat - stat_) < (90*tsttime):
+ raise error.TestFail('Process was not active in FROZEN'
+ 'state; stat=%s, stat_=%s, diff=%s' %
+ (stat, stat_, stat-stat_))
+
+ return ("Freezer works fine")
+
+
# Setup
# TODO: Add all new tests here
tests = {"blkio_bandwidth_weigth_read" : TestBlkioBandwidthWeigthRead,
@@ -774,9 +903,10 @@ def run_cgroup(test, params, env):
"blkio_throttle_multiple_read" : TestBlkioThrottleMultipleRead,
"blkio_throttle_multiple_write" : TestBlkioThrottleMultipleWrite,
"devices_access" : TestDevicesAccess,
+ "freezer" : TestFreezer,
}
modules = CgroupModules()
- if (modules.init(['blkio', 'devices']) <= 0):
+ if (modules.init(['blkio', 'devices', 'freezer']) <= 0):
raise error.TestFail('Can\'t mount any cgroup modules')
# Add all vms
vms = []
--
1.7.6.4
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