def create_container_with_specific_mems_cpus(name, mems, cpus):
need_fake_numa()
os.mkdir(full_path(name))
utils.write_one_line(cpuset_attr(name, 'mem_hardwall'), '1')
utils.write_one_line(mems_path(name), ','.join(map(str, mems)))
utils.write_one_line(cpus_path(name), ','.join(map(str, cpus)))
logging.debug('container %s has %d cpus and %d nodes totalling %s bytes',
name, len(cpus), len(get_mem_nodes(name)),
utils.human_format(container_bytes(name)))
def create_container_with_specific_mems_cpus(name, mems, cpus):
need_fake_numa()
os.mkdir(full_path(name))
utils.write_one_line(cpuset_attr(name, 'mem_hardwall'), '1')
utils.write_one_line(mems_path(name), ','.join(map(str, mems)))
utils.write_one_line(cpus_path(name), ','.join(map(str, cpus)))
logging.debug('container %s has %d cpus and %d nodes totalling %s bytes',
name, len(cpus), len(get_mem_nodes(name)),
utils.human_format(container_bytes(name)))
def create_container_via_memcg(name, parent, bytes, cpus):
# create container via direct memcg cgroup writes
os.mkdir(full_path(name))
nodes = utils.read_one_line(mems_path(parent))
utils.write_one_line(mems_path(name), nodes) # inherit parent's nodes
utils.write_one_line(memory_path(name) + '.limit_in_bytes', str(bytes))
utils.write_one_line(cpus_path(name), ','.join(map(str, cpus)))
logging.debug('Created container %s directly via memcg,'
' has %d cpus and %s bytes',
name, len(cpus), utils.human_format(container_bytes(name)))
def discover_container_style():
global super_root_path, cpuset_prefix
global mem_isolation_on, fake_numa_containers
global node_mbytes, root_container_bytes
if super_root_path != '':
return # already looked up
if os.path.exists('/dev/cgroup/tasks'):
# running on 2.6.26 or later kernel with containers on:
super_root_path = '/dev/cgroup'
cpuset_prefix = 'cpuset.'
if get_boot_numa():
mem_isolation_on = fake_numa_containers = True
else: # memcg containers IFF compiled-in & mounted & non-fakenuma boot
fake_numa_containers = False
mem_isolation_on = os.path.exists(
'/dev/cgroup/memory.limit_in_bytes')
# TODO: handle possibility of where memcg is mounted as its own
# cgroup hierarchy, separate from cpuset??
elif os.path.exists('/dev/cpuset/tasks'):
# running on 2.6.18 kernel with containers on:
super_root_path = '/dev/cpuset'
cpuset_prefix = ''
mem_isolation_on = fake_numa_containers = get_boot_numa() != ''
else:
# neither cpuset nor cgroup filesystem active:
super_root_path = None
cpuset_prefix = 'no_cpusets_or_cgroups_exist'
mem_isolation_on = fake_numa_containers = False
logging.debug('mem_isolation: %s', mem_isolation_on)
logging.debug('fake_numa_containers: %s', fake_numa_containers)
if fake_numa_containers:
node_mbytes = int(mbytes_per_mem_node())
elif mem_isolation_on: # memcg-style containers
# For now, limit total of all containers to using just 98% of system's
# visible total ram, to avoid oom events at system level, and avoid
# page reclaim overhead from going above kswapd highwater mark.
system_visible_pages = utils.memtotal() >> 2
usable_pages = int(system_visible_pages * 0.98)
root_container_bytes = usable_pages << 12
logging.debug('root_container_bytes: %s',
utils.human_format(root_container_bytes))
def discover_container_style():
global super_root_path, cpuset_prefix
global mem_isolation_on, fake_numa_containers
global node_mbytes, root_container_bytes
if super_root_path != '':
return # already looked up
if os.path.exists('/dev/cgroup/tasks'):
# running on 2.6.26 or later kernel with containers on:
super_root_path = '/dev/cgroup'
cpuset_prefix = 'cpuset.'
if get_boot_numa():
mem_isolation_on = fake_numa_containers = True
else: # memcg containers IFF compiled-in & mounted & non-fakenuma boot
fake_numa_containers = False
mem_isolation_on = os.path.exists(
'/dev/cgroup/memory.limit_in_bytes')
# TODO: handle possibility of where memcg is mounted as its own
# cgroup hierarchy, separate from cpuset??
elif os.path.exists('/dev/cpuset/tasks'):
# running on 2.6.18 kernel with containers on:
super_root_path = '/dev/cpuset'
cpuset_prefix = ''
mem_isolation_on = fake_numa_containers = get_boot_numa() != ''
else:
# neither cpuset nor cgroup filesystem active:
super_root_path = None
cpuset_prefix = 'no_cpusets_or_cgroups_exist'
mem_isolation_on = fake_numa_containers = False
logging.debug('mem_isolation: %s', mem_isolation_on)
logging.debug('fake_numa_containers: %s', fake_numa_containers)
if fake_numa_containers:
node_mbytes = int(mbytes_per_mem_node())
elif mem_isolation_on: # memcg-style containers
# For now, limit total of all containers to using just 98% of system's
# visible total ram, to avoid oom events at system level, and avoid
# page reclaim overhead from going above kswapd highwater mark.
system_visible_pages = utils_memory.memtotal() >> 2
usable_pages = int(system_visible_pages * 0.98)
root_container_bytes = usable_pages << 12
logging.debug('root_container_bytes: %s',
utils.human_format(root_container_bytes))