show swapped processes

swapped_process.py

#!/usr/bin/env python
# -*- Mode: python; tab-width: 4; indent-tabs-mode: nil; coding: utf-8; -*-

import sys
import subprocess
from operator import itemgetter


def show_swapped_processes():
    p = subprocess.Popen('grep VmSwap /proc/*/status',
                         shell=True, stdout=subprocess.PIPE)
    entries = []
    for line in p.stdout.readlines():
        s = str(line, encoding='utf8') if sys.version_info[0] == 3 else line
        s = s.split(':')
        pid = s[0].split('/')[2]
        size_kb = int(s[2].split()[0])
        if pid == 'self' or size_kb == 0:
            continue
        proc_name = None
        try:
            with open('/proc/{}/status'.format(pid)) as f:
                for prop in f.readlines():
                    if prop.startswith('Name'):
                        proc_name = prop.split(':')[1].strip()
                        break
        except:
            continue
        else:
            entries.append((pid, proc_name, size_kb))
    entries.sort(key=itemgetter(2), reverse=True)
    print('{:^8}|{:^18}| {:^10}  |'.format('pid', 'process name', 'size'))
    for entry in entries:
        print('{:<7} | {:>16} | {:>8} kb |'.format(*entry))
    total = sum(map(itemgetter(2), entries))
    print('*{:<28}{:>8} kb'.format('Total', total))

if __name__ == '__main__':
    show_swapped_processes()

# EOF

''' output 
$ ./swapped_process.py
  pid   |   process name   |    size     |
897     |           python |    16916 kb |
898     |           python |    13928 kb |
704     |  systemd-journal |     4196 kb |
~~snip~~
235     |           agetty |      100 kb |
*Total                          68720 kb
$
'''