#!/usr/bin/python

# restart multipath service if multipathd needs to much memory

# Copyright 2013,2017 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import os
import errno
import sys
import psutil
import subprocess

total_mem = psutil.virtual_memory().total

for p in psutil.process_iter():
	try:
		if p.name() != 'multipathd': continue
		parent = p.parent()
		if parent is None: continue
		if parent.pid != 1: continue
		#
		used = p.memory_info().vms
		if used > 6*1024**3:
			subprocess.check_call(['/usr/sbin/service', 'multipathd', 'restart'])
			print("Did restart multipathd, one hopes.  Virtual Memory Used: %d"%(used,))
	except psutil.NoSuchProcess:
		pass