data.py

#
# Check for requirements:
#   o Linux >= 2.6.20 with I/O accounting and VM event counters
#

ioaccounting = os.path.exists('/proc/self/io')

try:
    from iotop.vmstat import VmStat
    vmstat_f = VmStat()
except:
    vm_event_counters = False
else:
    vm_event_counters = True

if not ioaccounting or not vm_event_counters:
    print('Could not run iotop as some of the requirements are not met:')
    print('- Linux >= 2.6.20 with')
    if not ioaccounting:
        print('  - I/O accounting support ' \
          '(CONFIG_TASKSTATS, CONFIG_TASK_DELAY_ACCT, ' \
          'CONFIG_TASK_IO_ACCOUNTING)')
    if not vm_event_counters:
        print('  - VM event counters (CONFIG_VM_EVENT_COUNTERS)')
    sys.exit(1)