diff --git a/sensors/ps_mem.py b/sensors/ps_mem.py
index f98e5c3..2e0fed8 100644
--- a/sensors/ps_mem.py
+++ b/sensors/ps_mem.py
@@ -1,115 +1,17 @@
 #!/usr/bin/env python
 
-# Try to determine how much RAM is currently being used per program.
-# Note per _program_, not per process. So for example this script
-# will report RAM used by all httpd process together. In detail it reports:
-# sum(private RAM for program processes) + sum(Shared RAM for program processes)
-# The shared RAM is problematic to calculate, and this script automatically
-# selects the most accurate method available for your kernel.
-
+# Based on ps_mem.py:
 # Licence: LGPLv2
 # Author:  P@draigBrady.com
 # Source:  http://www.pixelbeat.org/scripts/ps_mem.py
-
-# V1.0      06 Jul 2005     Initial release
-# V1.1      11 Aug 2006     root permission required for accuracy
-# V1.2      08 Nov 2006     Add total to output
-#                           Use KiB,MiB,... for units rather than K,M,...
-# V1.3      22 Nov 2006     Ignore shared col from /proc/$pid/statm for
-#                           2.6 kernels up to and including 2.6.9.
-#                           There it represented the total file backed extent
-# V1.4      23 Nov 2006     Remove total from output as it's meaningless
-#                           (the shared values overlap with other programs).
-#                           Display the shared column. This extra info is
-#                           useful, especially as it overlaps between programs.
-# V1.5      26 Mar 2007     Remove redundant recursion from human()
-# V1.6      05 Jun 2007     Also report number of processes with a given name.
-#                           Patch from riccardo.murri@gmail.com
-# V1.7      20 Sep 2007     Use PSS from /proc/$pid/smaps if available, which
-#                           fixes some over-estimation and allows totalling.
-#                           Enumerate the PIDs directly rather than using ps,
-#                           which fixes the possible race between reading
-#                           RSS with ps, and shared memory with this program.
-#                           Also we can show non truncated command names.
-# V1.8      28 Sep 2007     More accurate matching for stats in /proc/$pid/smaps
-#                           as otherwise could match libraries causing a crash.
-#                           Patch from patrice.bouchand.fedora@gmail.com
-# V1.9      20 Feb 2008     Fix invalid values reported when PSS is available.
-#                           Reported by Andrey Borzenkov <arvidjaar@mail.ru>
-# V3.3      24 Jun 2014
 #   http://github.com/pixelb/scripts/commits/master/scripts/ps_mem.py
 
-# Notes:
-#
-# All interpreted programs where the interpreter is started
-# by the shell or with env, will be merged to the interpreter
-# (as that's what's given to exec). For e.g. all python programs
-# starting with "#!/usr/bin/env python" will be grouped under python.
-# You can change this by using the full command line but that will
-# have the undesirable affect of splitting up programs started with
-# differing parameters (for e.g. mingetty tty[1-6]).
-#
-# For 2.6 kernels up to and including 2.6.13 and later 2.4 redhat kernels
-# (rmap vm without smaps) it can not be accurately determined how many pages
-# are shared between processes in general or within a program in our case:
-# http://lkml.org/lkml/2005/7/6/250
-# A warning is printed if overestimation is possible.
-# In addition for 2.6 kernels up to 2.6.9 inclusive, the shared
-# value in /proc/$pid/statm is the total file-backed extent of a process.
-# We ignore that, introducing more overestimation, again printing a warning.
-# Since kernel 2.6.23-rc8-mm1 PSS is available in smaps, which allows
-# us to calculate a more accurate value for the total RAM used by programs.
-#
-# Programs that use CLONE_VM without CLONE_THREAD are discounted by assuming
-# they're the only programs that have the same /proc/$PID/smaps file for
-# each instance.  This will fail if there are multiple real instances of a
-# program that then use CLONE_VM without CLONE_THREAD, or if a clone changes
-# its memory map while we're checksumming each /proc/$PID/smaps.
-#
-# I don't take account of memory allocated for a program
-# by other programs. For e.g. memory used in the X server for
-# a program could be determined, but is not.
-#
-# FreeBSD is supported if linprocfs is mounted at /compat/linux/proc/
-# FreeBSD 8.0 supports up to a level of Linux 2.6.16
-
-import getopt
-import time
 import errno
 import os
 import sys
 
-try:
-    # md5 module is deprecated on python 2.6
-    # so try the newer hashlib first
-    import hashlib
-    md5_new = hashlib.md5
-except ImportError:
-    import md5
-    md5_new = md5.new
 
 
-# The following exits cleanly on Ctrl-C or EPIPE
-# while treating other exceptions as before.
-def std_exceptions(etype, value, tb):
-    sys.excepthook = sys.__excepthook__
-    if issubclass(etype, KeyboardInterrupt):
-        pass
-    elif issubclass(etype, IOError) and value.errno == errno.EPIPE:
-        pass
-    else:
-        sys.__excepthook__(etype, value, tb)
-sys.excepthook = std_exceptions
-
-#
-#   Define some global variables
-#
-
-PAGESIZE = os.sysconf("SC_PAGE_SIZE") / 1024 #KiB
-our_pid = os.getpid()
-
-have_pss = 0
-
 class Proc:
     def __init__(self):
         uname = os.uname()
@@ -131,68 +33,10 @@
                 raise LookupError
             raise
 
-proc = Proc()
 
-
-#
-#   Functions
-#
-
-def parse_options():
-    try:
-        long_options = ['split-args', 'help', 'total']
-        opts, args = getopt.getopt(sys.argv[1:], "shtp:w:", long_options)
-    except getopt.GetoptError:
-        sys.stderr.write(help())
-        sys.exit(3)
-
-    if len(args):
-        sys.stderr.write("Extraneous arguments: %s\n" % args)
-        sys.exit(3)
-
-    # ps_mem.py options
-    split_args = False
-    pids_to_show = None
-    watch = None
-    only_total = False
-
-    for o, a in opts:
-        if o in ('-s', '--split-args'):
-            split_args = True
-        if o in ('-t', '--total'):
-            only_total = True
-        if o in ('-h', '--help'):
-            sys.stdout.write(help())
-            sys.exit(0)
-        if o in ('-p',):
-            try:
-                pids_to_show = [int(x) for x in a.split(',')]
-            except:
-                sys.stderr.write(help())
-                sys.exit(3)
-        if o in ('-w',):
-            try:
-                watch = int(a)
-            except:
-                sys.stderr.write(help())
-                sys.exit(3)
-
-    return (split_args, pids_to_show, watch, only_total)
-
-def help():
-    help_msg = 'Usage: ps_mem [OPTION]...\n' \
-    'Show program core memory usage\n' \
-    '\n' \
-    '  -h, -help                   Show this help\n' \
-    '  -p <pid>[,pid2,...pidN]     Only show memory usage PIDs in the specified list\n' \
-    '  -s, --split-args            Show and separate by, all command line arguments\n' \
-    '  -t, --total                 Show only the total value\n' \
-    '  -w <N>                      Measure and show process memory every N seconds\n'
-
-    return help_msg
-
-#(major,minor,release)
 def kernel_ver():
+    """ Return (major,minor,release)"""
+    proc = Proc()
     kv = proc.open('sys/kernel/osrelease').readline().split(".")[:3]
     last = len(kv)
     if last == 2:
@@ -209,22 +53,24 @@
     return (int(kv[0]), int(kv[1]), int(kv[2]))
 
 
-#return Private,Shared
 #Note shared is always a subset of rss (trs is not always)
 def getMemStats(pid):
-    global have_pss
-    mem_id = pid #unique
+    """ Return memory data of pid in format (Private, Shared) """
+
+    PAGESIZE = os.sysconf("SC_PAGE_SIZE") / 1024 #KiB
+    proc = Proc()
+
     Private_lines = []
     Shared_lines = []
     Pss_lines = []
+
     Rss = (int(proc.open(pid, 'statm').readline().split()[1])
            * PAGESIZE)
+
     if os.path.exists(proc.path(pid, 'smaps')): #stat
-        digester = md5_new()
         for line in proc.open(pid, 'smaps').readlines(): #open
             # Note we checksum smaps as maps is usually but
             # not always different for separate processes.
-            digester.update(line.encode('latin1'))
             if line.startswith("Shared"):
                 Shared_lines.append(line)
             elif line.startswith("Private"):
@@ -232,7 +78,6 @@
             elif line.startswith("Pss"):
                 have_pss = 1
                 Pss_lines.append(line)
-        mem_id = digester.hexdigest()
         Shared = sum([int(line.split()[1]) for line in Shared_lines])
         Private = sum([int(line.split()[1]) for line in Private_lines])
         #Note Shared + Private = Rss above
@@ -241,257 +86,11 @@
             pss_adjust = 0.5 # add 0.5KiB as this avg error due to trunctation
             Pss = sum([float(line.split()[1])+pss_adjust for line in Pss_lines])
             Shared = Pss - Private
-    elif (2,6,1) <= kernel_ver() <= (2,6,9):
+    elif (2, 6, 1) <= kernel_ver() <= (2, 6, 9):
         Shared = 0 #lots of overestimation, but what can we do?
         Private = Rss
     else:
         Shared = int(proc.open(pid, 'statm').readline().split()[2])
         Shared *= PAGESIZE
         Private = Rss - Shared
-    return (Private, Shared, mem_id)
-
-
-def getCmdName(pid, split_args):
-    cmdline = proc.open(pid, 'cmdline').read().split("\0")
-    if cmdline[-1] == '' and len(cmdline) > 1:
-        cmdline = cmdline[:-1]
-
-    path = proc.path(pid, 'exe')
-    try:
-        path = os.readlink(path)
-        # Some symlink targets were seen to contain NULs on RHEL 5 at least
-        # https://github.com/pixelb/scripts/pull/10, so take string up to NUL
-        path = path.split('\0')[0]
-    except OSError:
-        val = sys.exc_info()[1]
-        if (val.errno == errno.ENOENT or # either kernel thread or process gone
-            val.errno == errno.EPERM):
-            raise LookupError
-        raise
-
-    if split_args:
-        return " ".join(cmdline)
-    if path.endswith(" (deleted)"):
-        path = path[:-10]
-        if os.path.exists(path):
-            path += " [updated]"
-        else:
-            #The path could be have prelink stuff so try cmdline
-            #which might have the full path present. This helped for:
-            #/usr/libexec/notification-area-applet.#prelink#.fX7LCT (deleted)
-            if os.path.exists(cmdline[0]):
-                path = cmdline[0] + " [updated]"
-            else:
-                path += " [deleted]"
-    exe = os.path.basename(path)
-    cmd = proc.open(pid, 'status').readline()[6:-1]
-    if exe.startswith(cmd):
-        cmd = exe #show non truncated version
-        #Note because we show the non truncated name
-        #one can have separated programs as follows:
-        #584.0 KiB +   1.0 MiB =   1.6 MiB    mozilla-thunder (exe -> bash)
-        # 56.0 MiB +  22.2 MiB =  78.2 MiB    mozilla-thunderbird-bin
-    return cmd
-
-
-#The following matches "du -h" output
-#see also human.py
-def human(num, power="Ki", units=None):
-    if units is None:
-        powers = ["Ki", "Mi", "Gi", "Ti"]
-        while num >= 1000: #4 digits
-            num /= 1024.0
-            power = powers[powers.index(power)+1]
-        return "%.1f %sB" % (num, power)
-    else:
-        return "%.f" % ((num * 1024) / units)
-
-
-def cmd_with_count(cmd, count):
-    if count > 1:
-        return "%s (%u)" % (cmd, count)
-    else:
-        return cmd
-
-#Warn of possible inaccuracies
-#2 = accurate & can total
-#1 = accurate only considering each process in isolation
-#0 = some shared mem not reported
-#-1= all shared mem not reported
-def shared_val_accuracy():
-    """http://wiki.apache.org/spamassassin/TopSharedMemoryBug"""
-    kv = kernel_ver()
-    pid = os.getpid()
-    if kv[:2] == (2,4):
-        if proc.open('meminfo').read().find("Inact_") == -1:
-            return 1
-        return 0
-    elif kv[:2] == (2,6):
-        if os.path.exists(proc.path(pid, 'smaps')):
-            if proc.open(pid, 'smaps').read().find("Pss:")!=-1:
-                return 2
-            else:
-                return 1
-        if (2,6,1) <= kv <= (2,6,9):
-            return -1
-        return 0
-    elif kv[0] > 2 and os.path.exists(proc.path(pid, 'smaps')):
-        return 2
-    else:
-        return 1
-
-def show_shared_val_accuracy( possible_inacc, only_total=False ):
-    level = ("Warning","Error")[only_total]
-    if possible_inacc == -1:
-        sys.stderr.write(
-         "%s: Shared memory is not reported by this system.\n" % level
-        )
-        sys.stderr.write(
-         "Values reported will be too large, and totals are not reported\n"
-        )
-    elif possible_inacc == 0:
-        sys.stderr.write(
-         "%s: Shared memory is not reported accurately by this system.\n" % level
-        )
-        sys.stderr.write(
-         "Values reported could be too large, and totals are not reported\n"
-        )
-    elif possible_inacc == 1:
-        sys.stderr.write(
-         "%s: Shared memory is slightly over-estimated by this system\n"
-         "for each program, so totals are not reported.\n" % level
-        )
-    sys.stderr.close()
-    if only_total and possible_inacc != 2:
-        sys.exit(1)
-
-def get_memory_usage( pids_to_show, split_args, include_self=False, only_self=False ):
-    cmds = {}
-    shareds = {}
-    mem_ids = {}
-    count = {}
-    for pid in os.listdir(proc.path('')):
-        if not pid.isdigit():
-            continue
-        pid = int(pid)
-
-        # Some filters
-        if only_self and pid != our_pid:
-            continue
-        if pid == our_pid and not include_self:
-            continue
-        if pids_to_show is not None and pid not in pids_to_show:
-            continue
-
-        try:
-            cmd = getCmdName(pid, split_args)
-        except LookupError:
-            #operation not permitted
-            #kernel threads don't have exe links or
-            #process gone
-            continue
-
-        try:
-            private, shared, mem_id = getMemStats(pid)
-        except RuntimeError:
-            continue #process gone
-        if shareds.get(cmd):
-            if have_pss: #add shared portion of PSS together
-                shareds[cmd] += shared
-            elif shareds[cmd] < shared: #just take largest shared val
-                shareds[cmd] = shared
-        else:
-            shareds[cmd] = shared
-        cmds[cmd] = cmds.setdefault(cmd, 0) + private
-        if cmd in count:
-            count[cmd] += 1
-        else:
-            count[cmd] = 1
-        mem_ids.setdefault(cmd, {}).update({mem_id:None})
-
-    #Add shared mem for each program
-    total = 0
-    for cmd in cmds:
-        cmd_count = count[cmd]
-        if len(mem_ids[cmd]) == 1 and cmd_count > 1:
-            # Assume this program is using CLONE_VM without CLONE_THREAD
-            # so only account for one of the processes
-            cmds[cmd] /= cmd_count
-            if have_pss:
-                shareds[cmd] /= cmd_count
-        cmds[cmd] = cmds[cmd] + shareds[cmd]
-        total += cmds[cmd] #valid if PSS available
-
-    sorted_cmds = sorted(cmds.items(), key=lambda x:x[1])
-    sorted_cmds = [x for x in sorted_cmds if x[1]]
-
-    return sorted_cmds, shareds, count, total
-
-def print_header():
-    sys.stdout.write(" Private  +   Shared  =  RAM used\tProgram\n\n")
-
-def print_memory_usage(sorted_cmds, shareds, count, total):
-    for cmd in sorted_cmds:
-        sys.stdout.write("%9s + %9s = %9s\t%s\n" %
-                         (human(cmd[1]-shareds[cmd[0]]),
-                          human(shareds[cmd[0]]), human(cmd[1]),
-                          cmd_with_count(cmd[0], count[cmd[0]])))
-    if have_pss:
-        sys.stdout.write("%s\n%s%9s\n%s\n" %
-                         ("-" * 33, " " * 24, human(total), "=" * 33))
-
-def verify_environment():
-    if os.geteuid() != 0:
-        sys.stderr.write("Sorry, root permission required.\n")
-        if __name__ == '__main__':
-            sys.stderr.close()
-            sys.exit(1)
-
-    try:
-        kv = kernel_ver()
-    except (IOError, OSError):
-        val = sys.exc_info()[1]
-        if val.errno == errno.ENOENT:
-            sys.stderr.write(
-              "Couldn't access " + proc.path('') + "\n"
-              "Only GNU/Linux and FreeBSD (with linprocfs) are supported\n")
-            sys.exit(2)
-        else:
-            raise
-
-if __name__ == '__main__':
-    split_args, pids_to_show, watch, only_total = parse_options()
-    verify_environment()
-
-    if not only_total:
-        print_header()
-
-    if watch is not None:
-        try:
-            sorted_cmds = True
-            while sorted_cmds:
-                sorted_cmds, shareds, count, total = get_memory_usage( pids_to_show, split_args )
-                if only_total and have_pss:
-                    sys.stdout.write(human(total, units=1)+'\n')
-                elif not only_total:
-                    print_memory_usage(sorted_cmds, shareds, count, total)
-                time.sleep(watch)
-            else:
-                sys.stdout.write('Process does not exist anymore.\n')
-        except KeyboardInterrupt:
-            pass
-    else:
-        # This is the default behavior
-        sorted_cmds, shareds, count, total = get_memory_usage( pids_to_show, split_args )
-        if only_total and have_pss:
-            sys.stdout.write(human(total, units=1)+'\n')
-        elif not only_total:
-            print_memory_usage(sorted_cmds, shareds, count, total)
-
-    # We must close explicitly, so that any EPIPE exception
-    # is handled by our excepthook, rather than the default
-    # one which is reenabled after this script finishes.
-    sys.stdout.close()
-
-    vm_accuracy = shared_val_accuracy()
-    show_shared_val_accuracy( vm_accuracy, only_total )
+    return (Private, Shared)
diff --git a/sensors/psram_sensors.py b/sensors/psram_sensors.py
index 74bc65e..db36710 100644
--- a/sensors/psram_sensors.py
+++ b/sensors/psram_sensors.py
@@ -1,10 +1,7 @@
-import os
-import time
-
 from ps_mem import getMemStats
 
 from discover import provides
-from utils import SensorInfo, get_pid_name, get_pid_list
+from utils import SensorInfo, get_pid_name
 
 
 
@@ -17,7 +14,7 @@
         try:
             dev_name = get_pid_name(pid)
 
-            private, shared, _ = getMemStats(pid)
+            private, shared = getMemStats(pid)
             total = private + shared
             sys_total = get_ram_size()
             usage = float(total) / float(sys_total)
@@ -39,6 +36,3 @@
     with open("/proc/meminfo") as proc:
         mem_total = proc.readline().split()
         return mem_total[1]
-
-if __name__ == '__main__':
-    print psram_stat(allowed_prefixes=["skype"])