def create_user_cgroups(user, script=True):
logger.info('Creating cgroups sub-directories for user %s' % user)
# Get hierarchies and create cgroups sub-directories
try:
hierarchies = os.listdir(BASE_CGROUPS)
except OSError as e:
if e.errno == 2:
raise CgroupsException(
"cgroups filesystem is not mounted on %s" % BASE_CGROUPS)
else:
raise OSError(e)
logger.debug('Hierarchies availables: %s' % hierarchies)
for hierarchy in hierarchies:
user_cgroup = os.path.join(BASE_CGROUPS, hierarchy, user)
if not os.path.exists(user_cgroup):
try:
os.mkdir(user_cgroup)
except OSError as e:
if e.errno == 13:
if script:
raise CgroupsException(
"Permission denied, you don't have root privileges")
else:
raise CgroupsException(
"Permission denied. If you want to use cgroups " +
"without root priviliges, please execute first " +
"the 'user_cgroups' command (as root or sudo).")
elif e.errno == 17:
pass
else:
raise OSError(e)
else:
uid, gid = get_user_info(user)
os.chown(user_cgroup, uid, gid)
logger.warn('cgroups sub-directories created for user %s' % user)
def set_freezer_state(self, state):
if state not in ('THAWED', 'FROZEN'):
raise CgroupsException(
"there is two values of freezer.state paramener available - THAWED|FROZEN."
)
if 'freezer' in self.cgroups:
freezer_state_file = self._get_cgroup_file('freezer',
'freezer.state')
with open(freezer_state_file, 'w+') as f:
f.write("%s\n" % state)
else:
raise CgroupsException(
'FREEZER hierarchy not available in this cgroup')
def set_swappiness(self, swappiness=SWAPPINESS_DEFAULT):
if 'memory' in self.cgroups:
swappiness = int(swappiness)
if swappiness < 0 and swappiness > 100:
raise CgroupsException(
"swappiness value must be in range 1..100")
value = swappiness
swappiness_file = self._get_cgroup_file('memory',
'memory.swappiness')
with open(swappiness_file, 'w+') as f:
f.write('%s\n' % value)
else:
raise CgroupsException(
'MEMORY hierarchy not available in this cgroup')
def _format_cpu_value(self, limit=None):
if limit is None:
value = CPU_DEFAULT
else:
try:
limit = float(limit)
except ValueError:
raise CgroupsException('Limit must be convertible to a float')
else:
if limit <= float(0) or limit > float(100):
raise CgroupsException('Limit must be between 0 and 100')
else:
limit = limit / 100
value = int(round(CPU_DEFAULT * limit))
return value
def _format_cpu_share_value(self, share=None):
if share is None:
value = CPU_DEFAULT
else:
try:
share = float(share)
except ValueError:
raise CgroupsException('Share must be convertible to a float')
else:
if share <= float(0) or share > float(100):
raise CgroupsException('Share must be between 0 and 100')
else:
share = share / 100
value = int(round(CPU_DEFAULT * share))
return value
def __init__(self, name, hierarchies='all', user='******'):
self.name = name
# Get user
self.user = user
if self.user == 'current':
self.user = getpass.getuser()
# Get hierarchies
if hierarchies == 'all':
hierarchies = HIERARCHIES
self.hierarchies = [h for h in hierarchies if h in HIERARCHIES]
# Get user cgroups
self.user_cgroups = {}
system_hierarchies = os.listdir(BASE_CGROUPS)
for hierarchy in self.hierarchies:
if hierarchy not in system_hierarchies:
raise CgroupsException("Hierarchy %s is not mounted" %
hierarchy)
user_cgroup = os.path.join(BASE_CGROUPS, hierarchy, self.user)
self.user_cgroups[hierarchy] = user_cgroup
create_user_cgroups(self.user, script=False)
# Create name cgroups
self.cgroups = {}
for hierarchy, user_cgroup in self.user_cgroups.items():
cgroup = os.path.join(user_cgroup, self.name)
if not os.path.exists(cgroup):
os.mkdir(cgroup)
self.cgroups[hierarchy] = cgroup
def get_user_info(user):
try:
user_system = getpwnam(user)
except KeyError:
raise CgroupsException("User %s doesn't exists" % user)
else:
uid = user_system.pw_uid
gid = user_system.pw_gid
return uid, gid
def set_cpu_limit(self, limit=None):
if 'cpu' in self.cgroups:
value = self._format_cpu_value(limit)
cpu_shares_file = self._get_cgroup_file('cpu', 'cpu.shares')
with open(cpu_shares_file, 'w+') as f:
f.write('%s\n' % value)
else:
raise CgroupsException(
'CPU hierarchy not available in this cgroup')
def _format_cfs(self, value=None):
if value is None:
value = CFS_DEFAULT
else:
try:
value = int(value)
except ValueError:
raise CgroupsException('value must be convertible to an int')
else:
if (value >= int(1000)
and value <= int(1000000)) or value == int(-1):
value = int(value)
else:
raise CgroupsException(
'value must be between 1000us and 1000000us or -1 for no restriction'
)
return value
def set_memory_limit(self, limit=None, unit='megabytes'):
if 'memory' in self.cgroups:
value = self._format_memory_value(unit, limit)
memory_limit_file = self._get_cgroup_file('memory',
'memory.limit_in_bytes')
with open(memory_limit_file, 'w+') as f:
f.write('%s\n' % value)
else:
raise CgroupsException(
'MEMORY hierarchy not available in this cgroup')
def set_cfs_period_us(self, period=100000):
'''specifies a period of time in microseconds µs for how regularly a cgroup's access to CPU resources should be reallocated'''
if 'cpu' in self.cgroups:
value = self._format_cfs(period)
cfs_period_file = self._get_cgroup_file('cpu', 'cpu.cfs_period_us')
with open(cfs_period_file, 'w+') as f:
f.write('%s\n' % value)
else:
raise CgroupsException(
'CPU hierarchy not available in this cgroup')
def set_cfs_quota_us(self, quota=-1):
'''cpu.cfs_quota_us = [1000us - 1000000us]'''
if 'cpu' in self.cgroups:
value = self._format_cfs(quota)
cfs_quota_file = self._get_cgroup_file('cpu', 'cpu.cfs_quota_us')
with open(cfs_quota_file, 'w+') as f:
print(type(value))
f.write('%s\n' % value)
else:
raise CgroupsException(
'CPU hierarchy not available in this cgroup')
def add(self, pid):
try:
os.kill(pid, 0)
except OSError:
raise CgroupsException('Pid %s does not exists' % pid)
for hierarchy, cgroup in self.cgroups.items():
tasks_file = self._get_cgroup_file(hierarchy, 'tasks')
with open(tasks_file, 'r+') as f:
cgroups_pids = f.read().split('\n')
if not str(pid) in cgroups_pids:
with open(tasks_file, 'a+') as f:
f.write('%s\n' % pid)
def _format_memory_value(self, unit, limit=None):
units = ('bytes', 'kilobytes', 'megabytes', 'gigabytes')
if unit not in units:
raise CgroupsException('Unit must be in %s' % units)
if limit is None:
value = MEMORY_DEFAULT
else:
try:
limit = int(limit)
except ValueError:
raise CgroupsException('Limit must be convertible to an int')
else:
if unit == 'bytes':
value = limit
elif unit == 'kilobytes':
value = limit * 1024
elif unit == 'megabytes':
value = limit * 1024 * 1024
elif unit == 'gigabytes':
value = limit * 1024 * 1024 * 1024
return value
def set_omm_kill(self, allow=True):
if 'memory' in self.cgroups:
oom_control_file = self._get_cgroup_file('memory',
'memory.oom_control')
oom_kill_disable = 0 if allow else 1
under_oom = 1 if self.is_under_oom else 0
with open(oom_control_file, 'w+') as f:
f.write("oom_kill_disable %s\nunder_oom %s\n" %
(oom_kill_disable, under_oom))
else:
raise CgroupsException(
'MEMORY hierarchy not available in this cgroup')
def _quota_set_cpu_limit(self, limit=None):
if 'cpu' in self.cgroups:
value = int(CPU_PER_PERIOD * CPU_COUNT * (limit / 100))
# cgroup 限制最小值为 1000
quota = 1000 if value < 1000 else value
cpu_cfs_peroid_file = self._get_cgroup_file('cpu', 'cpu.cfs_period_us')
cpu_cfs_quota_file = self._get_cgroup_file('cpu', 'cpu.cfs_quota_us')
with open(cpu_cfs_peroid_file, 'w+') as f:
f.write('{}\n'.format(CPU_PER_PERIOD))
with open(cpu_cfs_quota_file, 'w+') as f:
f.write('{}\n'.format(quota))
else:
raise CgroupsException('CPU hierarchy not available in this cgroup')
