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# Copyright (C) 2007 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
# USA
import os
# /proc/PID/maps consists of a number of lines like this:
# 00400000-004b1000 r-xp 00000000 fd:00 5767206 /bin/bash
# 006b1000-006bb000 rw-p 000b1000 fd:00 5767206 /bin/bash
# 006bb000-006c0000 rw-p 006bb000 00:00 0
# ...
# The fields are: address, permissions, offset, device, inode, and
# (for non-anonymous mappings) pathname.
#
# /proc/PID/smaps gives additional information for each mapping:
# 00400000-004b1000 r-xp 00000000 fd:00 5767206 /bin/bash
# Size: 708 kB
# Rss: 476 kB
# Shared_Clean: 468 kB
# Shared_Dirty: 0 kB
# Private_Clean: 8 kB
# Private_Dirty: 0 kB
# Referenced: 0 kb
#
# The "Referenced" line only appears in kernel 2.6.22 and later.
def get_shared_mapping_names(pid):
"""Returns a set of the files for which PID has a shared mapping"""
mappings = set()
infile = open("/proc/%s/maps" % pid, "r")
for line in infile:
# sharable mappings are non-anonymous and either read-only
# (permissions "r-..") or writable but explicitly marked
# shared ("rw.s")
fields = line.split()
if len(fields) < 6 or not fields[5].startswith('/'):
continue
if fields[1][0] != 'r' or (fields[1][1] == 'w' and fields[1][3] != 's'):
continue
mappings.add(fields[5])
infile.close()
return mappings
_smaps_lines_per_entry = None
def get_mappings(pid, ignored_shared_mappings):
"""Returns a list of (name, private, shared) tuples describing the
memory mappings of PID. Shared mappings named in
ignored_shared_mappings are ignored
"""
global _smaps_lines_per_entry
if _smaps_lines_per_entry is None:
if os.path.isfile('/proc/%s/clear_refs' % os.getpid()):
_smaps_lines_per_entry = 8
else:
_smaps_lines_per_entry = 7
mappings = []
smapfile = "/proc/%s/smaps" % pid
infile = open(smapfile, "r")
input = infile.read()
infile.close()
lines = input.splitlines()
for line_idx in range(0, len(lines), _smaps_lines_per_entry):
name_idx = lines[line_idx].find('/')
if name_idx == -1:
name = None
else:
name = lines[line_idx][name_idx:]
private_clean = int(lines[line_idx + 5][14:-3])
private_dirty = int(lines[line_idx + 6][14:-3])
if name in ignored_shared_mappings:
shared_clean = 0
shared_dirty = 0
else:
shared_clean = int(lines[line_idx + 3][14:-3])
shared_dirty = int(lines[line_idx + 4][14:-3])
mapping = Mapping(name, private_clean + private_dirty,
shared_clean + shared_dirty)
mappings.append (mapping)
return mappings
class Mapping:
def __init__ (self, name, private, shared):
self.name = name
self.private = private
self.shared = shared
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