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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...

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