Dump stats of memory pages which are hooked, but absent from /proc/<pid>/maps.

tools/deep_memory_profiler/dmprof.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """The deep heap profiler script for Chrome."""
 
 from datetime import datetime
 import json
 import logging
 import optparse
@@ skipping 724 matching lines @@
 
     return (version, ln)
 
   def _parse_global_stats(self):
     """Parses lines in self._lines as global stats."""
     (ln, _) = skip_while(
         0, len(self._lines),
         lambda n: self._lines[n] != 'GLOBAL_STATS:\n')
 
     global_stat_names = [
-        'total', 'file-exec', 'file-nonexec', 'anonymous', 'stack', 'other',
-        'nonprofiled-absent', 'nonprofiled-anonymous',
+        'total', 'absent', 'file-exec', 'file-nonexec', 'anonymous', 'stack',
+        'other', 'nonprofiled-absent', 'nonprofiled-anonymous',
         'nonprofiled-file-exec', 'nonprofiled-file-nonexec',
         'nonprofiled-stack', 'nonprofiled-other',
         'profiled-mmap', 'profiled-malloc']
 
     for prefix in global_stat_names:
       (ln, _) = skip_while(
           ln, len(self._lines),
           lambda n: self._lines[n].split()[0] != prefix)
       words = self._lines[ln].split()
       self._global_stats[prefix + '_virtual'] = int(words[-2])
@@ skipping 220 matching lines @@
         sizes['tc-total-log'])
     sizes['tc-total-record'] = dump.global_stat('profiled-malloc_committed')
     sizes['tc-unused'] = (
         sizes['mmap-tcmalloc'] -
         dump.global_stat('profiled-malloc_committed'))
     sizes['tc-total'] = sizes['mmap-tcmalloc']
 
     for key, value in {
         'total': 'total_committed',
         'filemapped': 'file_committed',
+        'absent': 'absent_committed',

[Alexander Potapenko, 2013/03/13 13:03:19]

I wonder if you can make this map global and use that map's keys() instead of
global_stat_names in _parse_global_stats() above. This way there'll be a single
point where you'll need to add a new global stat in this file.

[Dai Mikurube (NOT FULLTIME), 2013/03/14 11:26:22]

Yeah, I actually would like to do it, but it actually depends on the order of
global_stat_names.

I think about fixing the dependency, but it would be done in another change
since it needs more change.

         'file-exec': 'file-exec_committed',
         'file-nonexec': 'file-nonexec_committed',
         'anonymous': 'anonymous_committed',
         'stack': 'stack_committed',
         'other': 'other_committed',
         'unhooked-absent': 'nonprofiled-absent_committed',
         'unhooked-anonymous': 'nonprofiled-anonymous_committed',
         'unhooked-file-exec': 'nonprofiled-file-exec_committed',
         'unhooked-file-nonexec': 'nonprofiled-file-nonexec_committed',
         'unhooked-stack': 'nonprofiled-stack_committed',
@@ skipping 362 matching lines @@
     errorcode = COMMANDS[action]().do(sys.argv)
   except ParsingException, e:
     errorcode = 1
     sys.stderr.write('Exit by parsing error: %s\n' % e)
 
   return errorcode
 
 
 if __name__ == '__main__':
   sys.exit(main())