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####################################################################
# This class open the /proc/PID/maps and /proc/PID/smaps files
# to get useful information about the real memory usage
####################################################################
import os
import logging
_smaps_has_references = None
# Parse the /proc/PID/smaps file
class ProcSmaps:
mappings = [] # Devices information
def __init__(self, pid):
global _smaps_has_references
if _smaps_has_references is None:
_smaps_has_references = os.path.isfile('/proc/%s/clear_refs' %
os.getpid())
smapfile = "/proc/%s/smaps" % pid
self.mappings = []
# Coded by Federico Mena (script)
infile = open(smapfile, "r")
input = infile.read()
infile.close()
lines = input.splitlines()
num_lines = len (lines)
line_idx = 0
# 08065000-08067000 rw-p 0001c000 03:01 147613 /opt/gnome/bin/evolution-2.6
# Size: 8 kB
# Rss: 8 kB
# Shared_Clean: 0 kB
# Shared_Dirty: 0 kB
# Private_Clean: 8 kB
# Private_Dirty: 0 kB
# Referenced: 4 kb -> Introduced in kernel 2.6.22
while num_lines > 0:
fields = lines[line_idx].split (" ", 5)
if len (fields) == 6:
(offsets, permissions, bin_permissions, device, inode, name) = fields
else:
(offsets, permissions, bin_permissions, device, inode) = fields
name = ""
size = self.parse_smaps_size_line (lines[line_idx + 1])
rss = self.parse_smaps_size_line (lines[line_idx + 2])
shared_clean = self.parse_smaps_size_line (lines[line_idx + 3])
shared_dirty = self.parse_smaps_size_line (lines[line_idx + 4])
private_clean = self.parse_smaps_size_line (lines[line_idx + 5])
private_dirty = self.parse_smaps_size_line (lines[line_idx + 6])
if _smaps_has_references:
referenced = self.parse_smaps_size_line (lines[line_idx + 7])
else:
referenced = None
name = name.strip ()
mapping = Mapping (size, rss, shared_clean, shared_dirty, \
private_clean, private_dirty, referenced, permissions, name)
self.mappings.append (mapping)
if _smaps_has_references:
num_lines -= 8
line_idx += 8
else:
num_lines -= 7
line_idx += 7
if _smaps_has_references:
self._clear_reference(pid)
def _clear_reference(self, pid):
os.system("echo 1 > /proc/%s/clear_refs" % pid)
# Parses a line of the form "foo: 42 kB" and returns an integer for the "42" field
def parse_smaps_size_line (self, line):
# Rss: 8 kB
fields = line.split ()
return int(fields[1])
class Mapping:
def __init__ (self, size, rss, shared_clean, shared_dirty, \
private_clean, private_dirty, referenced, permissions, name):
self.size = size
self.rss = rss
self.shared_clean = shared_clean
self.shared_dirty = shared_dirty
self.private_clean = private_clean
self.private_dirty = private_dirty
self.referenced = referenced
self.permissions = permissions
self.name = name
# Parse /proc/PID/maps file to get the clean memory usage by process,
# we avoid lines with backed-files
class ProcMaps:
clean_size = 0
def __init__(self, pid):
mapfile = "/proc/%s/maps" % pid
try:
infile = open(mapfile, "r")
except:
print "Error trying " + mapfile
return None
sum = 0
to_data_do = {
"[anon]": self.parse_size_line,
"[heap]": self.parse_size_line
}
for line in infile:
arr = line.split()
# Just parse writable mapped areas
if arr[1][1] != "w":
continue
if len(arr) == 6:
# if we got a backed-file we skip this info
if os.path.isfile(arr[5]):
continue
else:
line_size = to_data_do.get(arr[5], self.skip)(line)
sum += line_size
else:
line_size = self.parse_size_line(line)
sum += line_size
infile.close()
self.clean_size = sum
def skip(self, line):
return 0
# Parse a maps line and return the mapped size
def parse_size_line(self, line):
start, end = line.split()[0].split('-')
size = int(end, 16) - int(start, 16)
return size
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