How to use discover_container_style method in autotest

Best Python code snippet using autotest_python

cpuset.py

Source:cpuset.py

...16fake_numa_containers = False # container mem via numa=fake mem nodes, else pages17mem_isolation_on = False18node_mbytes = 0         # mbytes in one typical mem node19root_container_bytes = 0  # squishy limit on effective size of root container20def discover_container_style():21    global super_root_path, cpuset_prefix22    global mem_isolation_on, fake_numa_containers23    global node_mbytes, root_container_bytes24    if super_root_path != '':25        return  # already looked up26    if os.path.exists('/dev/cgroup/tasks'):27        # running on 2.6.26 or later kernel with containers on:28        super_root_path = '/dev/cgroup'29        cpuset_prefix = 'cpuset.'30        if get_boot_numa():31            mem_isolation_on = fake_numa_containers = True32        else:  # memcg containers IFF compiled-in & mounted & non-fakenuma boot33            fake_numa_containers = False34            mem_isolation_on = os.path.exists(35                    '/dev/cgroup/memory.limit_in_bytes')36            # TODO: handle possibility of where memcg is mounted as its own37            #       cgroup hierarchy, separate from cpuset??38    elif os.path.exists('/dev/cpuset/tasks'):39        # running on 2.6.18 kernel with containers on:40        super_root_path = '/dev/cpuset'41        cpuset_prefix = ''42        mem_isolation_on = fake_numa_containers = get_boot_numa() != ''43    else:44        # neither cpuset nor cgroup filesystem active:45        super_root_path = None46        cpuset_prefix = 'no_cpusets_or_cgroups_exist'47        mem_isolation_on = fake_numa_containers = False48    logging.debug('mem_isolation: %s', mem_isolation_on)49    logging.debug('fake_numa_containers: %s', fake_numa_containers)50    if fake_numa_containers:51        node_mbytes = int(mbytes_per_mem_node())52    elif mem_isolation_on:  # memcg-style containers53        # For now, limit total of all containers to using just 98% of system's54        #   visible total ram, to avoid oom events at system level, and avoid55        #   page reclaim overhead from going above kswapd highwater mark.56        system_visible_pages = utils.memtotal() >> 257        usable_pages = int(system_visible_pages * 0.98)58        root_container_bytes = usable_pages << 1259        logging.debug('root_container_bytes: %s',60                      utils.human_format(root_container_bytes))61def need_mem_containers():62    discover_container_style()63    if not mem_isolation_on:64        raise error.AutotestError('Mem-isolation containers not enabled '65                                  'by latest reboot')66def need_fake_numa():67    discover_container_style()68    if not fake_numa_containers:69        raise error.AutotestError('fake=numa not enabled by latest reboot')70def full_path(container_name):71    discover_container_style()72    return os.path.join(super_root_path, container_name)73def unpath(container_path):74    return container_path[len(super_root_path)+1:]75def cpuset_attr(container_name, attr):76    discover_container_style()77    return os.path.join(super_root_path, container_name, cpuset_prefix+attr)78def io_attr(container_name, attr):79    discover_container_style()80    # current version assumes shared cgroup hierarchy81    return os.path.join(super_root_path, container_name, 'io.'+attr)82def tasks_path(container_name):83    return os.path.join(full_path(container_name), 'tasks')84def mems_path(container_name):85    return cpuset_attr(container_name, 'mems')86def memory_path(container_name):87    return os.path.join(super_root_path, container_name, 'memory')88def cpus_path(container_name):89    return cpuset_attr(container_name, 'cpus')90def container_exists(name):91    return name is not None and os.path.exists(tasks_path(name))92def move_tasks_into_container(name, tasks):93    task_file = tasks_path(name)94    for task in tasks:95        try:96            logging.debug('moving task %s into container "%s"', task, name)97            utils.write_one_line(task_file, task)98        except Exception:99            if utils.pid_is_alive(task):100                raise   # task exists but couldn't move it101            # task is gone or zombie so ignore this exception102def move_self_into_container(name):103    me = str(os.getpid())104    move_tasks_into_container(name, [me])105    logging.debug('running self (pid %s) in container "%s"', me, name)106def _avail_mbytes_via_nodes(parent):107    # total mbytes of mem nodes available for new containers in parent108    free_nodes = available_exclusive_mem_nodes(parent)109    mbytes = nodes_avail_mbytes(free_nodes)110    # don't have exact model for how container mgr measures mem space111    # better here to underestimate than overestimate112    mbytes = max(mbytes - node_mbytes//2, 0)113    return mbytes114def _avail_bytes_via_pages(parent):115    # Get memory bytes available to parent container which could116    #  be allocated exclusively to new child containers.117    # This excludes mem previously allocated to existing children.118    available = container_bytes(parent)119    mem_files_pattern = os.path.join(full_path(parent),120                                     '*', 'memory.limit_in_bytes')121    for mem_file in glob.glob(mem_files_pattern):122        child_container = unpath(os.path.dirname(mem_file))123        available -= container_bytes(child_container)124    return available125def avail_mbytes(parent=SUPER_ROOT):126    # total mbytes available in parent, for exclusive use in new containers127    if fake_numa_containers:128        return _avail_mbytes_via_nodes(parent)129    else:130        return _avail_bytes_via_pages(parent) >> 20131def delete_leftover_test_containers():132    # recover mems and cores tied up by containers of prior failed tests:133    for child in inner_containers_of(SUPER_ROOT):134        _release_container_nest(child)135def my_lock(lockname):136    # lockname is 'inner'137    lockdir = os.environ['AUTODIR']138    lockname = os.path.join(lockdir, '.cpuset.lock.'+lockname)139    lockfile = open(lockname, 'w')140    fcntl.flock(lockfile, fcntl.LOCK_EX)141    return lockfile142def my_unlock(lockfile):143    fcntl.flock(lockfile, fcntl.LOCK_UN)144    lockfile.close()145# Convert '1-3,7,9-12' to set(1,2,3,7,9,10,11,12)146def rangelist_to_set(rangelist):147    result = set()148    if not rangelist:149        return result150    for x in rangelist.split(','):151        if re.match(r'^(\d+)$', x):152            result.add(int(x))153            continue154        m = re.match(r'^(\d+)-(\d+)$', x)155        if m:156            start = int(m.group(1))157            end = int(m.group(2))158            result.update(set(range(start, end+1)))159            continue160        msg = 'Cannot understand data input: %s %s' % (x, rangelist)161        raise ValueError(msg)162    return result163def my_container_name():164    # Get current process's inherited or self-built container name165    #   within /dev/cpuset or /dev/cgroup.  Is '' for root container.166    name = utils.read_one_line('/proc/%i/cpuset' % os.getpid())167    return name[1:]   # strip leading /168def get_mem_nodes(container_name):169    # all mem nodes now available to a container, both exclusive & shared170    file_name = mems_path(container_name)171    if os.path.exists(file_name):172        return rangelist_to_set(utils.read_one_line(file_name))173    else:174        return set()175def _busy_mem_nodes(parent_container):176    # Get set of numa memory nodes now used (exclusively or shared)177    #   by existing children of parent container178    busy = set()179    mem_files_pattern = os.path.join(full_path(parent_container),180                                     '*', cpuset_prefix+'mems')181    for mem_file in glob.glob(mem_files_pattern):182        child_container = os.path.dirname(mem_file)183        busy |= get_mem_nodes(child_container)184    return busy185def available_exclusive_mem_nodes(parent_container):186    # Get subset of numa memory nodes of parent container which could187    #  be allocated exclusively to new child containers.188    # This excludes nodes now allocated to existing children.189    need_fake_numa()190    available = get_mem_nodes(parent_container)191    available -= _busy_mem_nodes(parent_container)192    return available193def my_mem_nodes():194    # Get set of numa memory nodes owned by current process's container.195    discover_container_style()196    if not mem_isolation_on:197        return set()    # as expected by vmstress198    return get_mem_nodes(my_container_name())199def my_available_exclusive_mem_nodes():200    # Get subset of numa memory nodes owned by current process's201    # container, which could be allocated exclusively to new child202    # containers.  This excludes any nodes now allocated203    # to existing children.204    return available_exclusive_mem_nodes(my_container_name())205def node_avail_kbytes(node):206    return node_mbytes << 10  # crude; fixed numa node size207def nodes_avail_mbytes(nodes):208    # nodes' combined user+avail size, in Mbytes209    return sum(node_avail_kbytes(n) for n in nodes) // 1024...

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.