~carstengrohmann/OOMAnalyser

OOMAnalyser/OOMAnalyser.py -rw-r--r-- 76.9 KiB
a7e1e4cc — Carsten Grohmann Add support for journalctl output 3 days ago
                                                                                
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
# -*- coding: Latin-1 -*-
#
# Linux OOM Analyser
#
# Copyright (c) 2017-2021 Carsten Grohmann
# License: MIT - THIS PROGRAM COMES WITH NO WARRANTY

import re

DEBUG = False
"""Show additional information during the development cycle"""

VERSION = "0.5.0 (devel)"
"""Version number"""

# __pragma__ ('skip')
# MOC objects to satisfy statical checker and imports in unit tests
js_undefined = 0
class classList():

    def add(self, *args, **kwargs):
        pass

    def remove(self, *args, **kwargs):
        pass


class document():

    def querySelectorAll(self, *args, **kwargs):
        return [element()]

    def getElementById(self, *arg, **kwargs):
        return element()

    def createElementNS(self, *arg, **kwargs):
        return element()

    def createElement(self, *args, **kwargs):
        return element()


class element():

    firstChild = []
    classList = classList()
    offsetWidth = 0

    def removeChild(self, *args, **kwargs):
        return

    def appendChild(self, *args, **kwargs):
        return
# __pragma__ ('noskip')


class OOMEntityState:
    """Enum for completeness of the OOM block"""
    unknown = 0
    empty = 1
    invalid = 2
    started = 3
    complete = 4


class OOMEntityType:
    """Enum for the type of the OOM"""
    unknown = 0
    automatic = 1
    manual = 2


def is_visible(element):
    return element.offsetWidth > 0 and element.offsetHeight > 0


def hide_element(element_id):
    """Hide the given HTML element"""
    element = document.getElementById(element_id)
    element.classList.add('js-text--display-none')


def show_element(element_id):
    """Show the given HTML element"""
    element = document.getElementById(element_id)
    element.classList.remove('js-text--display-none')


def hide_elements(selector):
    """Hide all matching elements by adding class js-text--display-none"""
    for element in document.querySelectorAll(selector):
        element.classList.add('js-text--display-none')


def show_elements(selector):
    """Show all matching elements by removing class js-text--display-none"""
    for element in document.querySelectorAll(selector):
        element.classList.remove('js-text--display-none')


def toggle(element_id):
    """Toggle the visibility of the given HTML element"""
    element = document.getElementById(element_id)
    element.classList.toggle('js-text--display-none')


def escape_html(unsafe):
    """
    Escape unsafe HTML entities

    @type unsafe: str
    @rtype: str
    """
    return unsafe.replace('&', "&")\
        .replace('<', "&lt;")\
        .replace('>', "&gt;")\
        .replace('"', "&quot;")\
        .replace("'", "&#039;")


def error(msg):
    """Show the error box and add the error message"""
    show_notifybox('ERROR', msg)


def internal_error(msg):
    """Show the error box and add the internal error message"""
    show_notifybox('INTERNAL ERROR', msg)


def warning(msg):
    """Show the error box and add the warning message"""
    show_notifybox('WARNING', msg)


def show_notifybox(prefix, msg):
    """Show escaped message in the notification box"""
    if prefix == 'WARNING':
        css_class = 'js-notify_box__msg--warning'
    else:
        css_class = 'js-notify_box__msg--error'
    show_element('notify_box')
    notify_box = document.getElementById('notify_box')
    notification = document.createElement('div')
    notification.classList.add(css_class)
    notification.innerHTML = '{}: {}<br>'.format(prefix, escape_html(msg))
    notify_box.appendChild(notification)


class BaseKernelConfig:
    """Base class for all kernel specific configuration"""

    name = 'Base configuration for all kernels'
    """Name/description of this kernel configuration"""

    EXTRACT_PATTERN = None
    """
    Instance specific dictionary of RE pattern to analyse a OOM block for a specific kernel version
    
    This dict will be filled from EXTRACT_PATTERN_BASE and EXTRACT_PATTERN_OVERLAY during class constructor is executed.
    
    :type: None|Dict
    :see: EXTRACT_PATTERN_BASE and EXTRACT_PATTERN_OVERLAY
    """

    EXTRACT_PATTERN_BASE = {
        'invoked oom-killer': (
            r'^(?P<trigger_proc_name>[\S ]+) invoked oom-killer: '
            r'gfp_mask=(?P<trigger_proc_gfp_mask>0x[a-z0-9]+)(\((?P<trigger_proc_gfp_flags>[A-Z_|]+)\))?, '
            r'(nodemask=(?P<trigger_proc_nodemask>([\d,-]+|\(null\))), )?'
            r'order=(?P<trigger_proc_order>-?\d+), '
            r'oom_score_adj=(?P<trigger_proc_oomscore>\d+)',
            True,
        ),
        'Trigger process and kernel version': (
            r'^CPU: \d+ PID: (?P<trigger_proc_pid>\d+) '
            r'Comm: .* (Not tainted|Tainted:.*) '
            r'(?P<kernel_version>\d[\w.-]+) #\d',
            True,
        ),

        # split caused by a limited number of iterations during converting PY regex into JS regex
        'Mem-Info (part 1)': (
            r'^Mem-Info:.*'
            r'(?:\n)'

            # first line (starting w/o a space)
            r'^active_anon:(?P<active_anon_pages>\d+) inactive_anon:(?P<inactive_anon_pages>\d+) '
            r'isolated_anon:(?P<isolated_anon_pages>\d+)'
            r'(?:\n)'

            # remaining lines (w/ leading space)
            r'^ active_file:(?P<active_file_pages>\d+) inactive_file:(?P<inactive_file_pages>\d+) '
            r'isolated_file:(?P<isolated_file_pages>\d+)'
            r'(?:\n)'

            r'^ unevictable:(?P<unevictable_pages>\d+) dirty:(?P<dirty_pages>\d+) writeback:(?P<writeback_pages>\d+) '
            r'unstable:(?P<unstable_pages>\d+)',
            True,
        ),
        'Mem-Info (part 2)': (
            r'^ slab_reclaimable:(?P<slab_reclaimable_pages>\d+) slab_unreclaimable:(?P<slab_unreclaimable_pages>\d+)'
            r'(?:\n)'
            r'^ mapped:(?P<mapped_pages>\d+) shmem:(?P<shmem_pages>\d+) pagetables:(?P<pagetables_pages>\d+) '
            r'bounce:(?P<bounce_pages>\d+)'
            r'(?:\n)'
            r'^ free:(?P<free_pages>\d+) free_pcp:(?P<free_pcp_pages>\d+) free_cma:(?P<free_cma_pages>\d+)',
            True,
        ),
        'Memory node information': (
            r'(^Node \d+ (DMA|Normal|hugepages).*(:?\n))+',
            False,
        ),
        'Page cache': (
            r'^(?P<pagecache_total_pages>\d+) total pagecache pages.*$',
            True,
        ),
        'Swap usage information': (
            r'^(?P<swap_cache_pages>\d+) pages in swap cache'
            r'(?:\n)'
            r'^Swap cache stats: add \d+, delete \d+, find \d+\/\d+'
            r'(?:\n)'
            r'^Free swap  = (?P<swap_free_kb>\d+)kB'
            r'(?:\n)'
            r'^Total swap = (?P<swap_total_kb>\d+)kB',
            False,
        ),
        'Page information': (
            r'^(?P<ram_pages>\d+) pages RAM'
            r'('
            r'(?:\n)'
            r'^(?P<highmem_pages>\d+) pages HighMem/MovableOnly'
            r')?'
            r'(?:\n)'
            r'^(?P<reserved_pages>\d+) pages reserved'
            r'('
            r'(?:\n)'
            r'^(?P<cma_pages>\d+) pages cma reserved'
            r')?'
            r'('
            r'(?:\n)'
            r'^(?P<pagetablecache_pages>\d+) pages in pagetable cache'
            r')?'
            r'('
            r'(?:\n)'
            r'^(?P<hwpoisoned_pages>\d+) pages hwpoisoned'
            r')?',
            True,
        ),
        'Process killed by OOM': (
            r'^Out of memory: Kill process (?P<killed_proc_pid>\d+) \((?P<killed_proc_name>[\S ]+)\) '
            r'score (?P<killed_proc_score>\d+) or sacrifice child',
            True,
        ),
        'Details of process killed by OOM': (
            r'^Killed process \d+ \(.*\)'
            r'(, UID \d+,)?'
            r' total-vm:(?P<killed_proc_total_vm_kb>\d+)kB, anon-rss:(?P<killed_proc_anon_rss_kb>\d+)kB, '
            r'file-rss:(?P<killed_proc_file_rss_kb>\d+)kB, shmem-rss:(?P<killed_proc_shmem_rss_kb>\d+)kB.*',
            True,
        ),
    }
    """
    RE pattern to extract information from OOM.
    
    The first item is the RE pattern and the second is whether it is mandatory to find this pattern.
    
    This dictionary will be copied to EXTRACT_PATTERN during class constructor is executed. 
    
    :type: dict(tuple(str, bool))
    :see: EXTRACT_PATTERN
    """

    EXTRACT_PATTERN_OVERLAY = {}
    """
    To extend / overwrite parts of EXTRACT_PATTERN in kernel configuration.
    
    :type: dict(tuple(str, bool))
    :see: EXTRACT_PATTERN
    """

    GFP_FLAGS = {
        'GFP_ATOMIC':           {'value': '__GFP_HIGH | __GFP_ATOMIC | __GFP_KSWAPD_RECLAIM'},
        'GFP_KERNEL':           {'value': '__GFP_RECLAIM | __GFP_IO | __GFP_FS'},
        'GFP_KERNEL_ACCOUNT':   {'value': 'GFP_KERNEL | __GFP_ACCOUNT'},
        'GFP_NOWAIT':           {'value': '__GFP_KSWAPD_RECLAIM'},
        'GFP_NOIO':             {'value': '__GFP_RECLAIM'},
        'GFP_NOFS':             {'value': '__GFP_RECLAIM | __GFP_IO'},
        'GFP_USER':             {'value': '__GFP_RECLAIM | __GFP_IO | __GFP_FS | __GFP_HARDWALL'},
        'GFP_DMA':              {'value': '__GFP_DMA'},
        'GFP_DMA32':            {'value': '__GFP_DMA32'},
        'GFP_HIGHUSER':         {'value': 'GFP_USER | __GFP_HIGHMEM'},
        'GFP_HIGHUSER_MOVABLE': {'value': 'GFP_HIGHUSER | __GFP_MOVABLE'},
        'GFP_TRANSHUGE_LIGHT':  {'value': 'GFP_HIGHUSER_MOVABLE | __GFP_COMP |  __GFP_NOMEMALLOC | __GFP_NOWARN & ~__GFP_RECLAIM'},
        'GFP_TRANSHUGE':        {'value': 'GFP_TRANSHUGE_LIGHT | __GFP_DIRECT_RECLAIM'},
        '__GFP_DMA':            {'value': 0x01},
        '__GFP_HIGHMEM':        {'value': 0x02},
        '__GFP_DMA32':          {'value': 0x04},
        '__GFP_MOVABLE':        {'value': 0x08},
        '__GFP_RECLAIMABLE':    {'value': 0x10},
        '__GFP_HIGH':           {'value': 0x20},
        '__GFP_IO':             {'value': 0x40},
        '__GFP_FS':             {'value': 0x80},
        '__GFP_COLD':           {'value': 0x100},
        '__GFP_NOWARN':         {'value': 0x200},
        '__GFP_RETRY_MAYFAIL':  {'value': 0x400},
        '__GFP_NOFAIL':         {'value': 0x800},
        '__GFP_NORETRY':        {'value': 0x1000},
        '__GFP_MEMALLOC':       {'value': 0x2000},
        '__GFP_COMP':           {'value': 0x4000},
        '__GFP_ZERO':           {'value': 0x8000},
        '__GFP_NOMEMALLOC':     {'value': 0x10000},
        '__GFP_HARDWALL':       {'value': 0x20000},
        '__GFP_THISNODE':       {'value': 0x40000},
        '__GFP_ATOMIC':         {'value': 0x80000},
        '__GFP_ACCOUNT':        {'value': 0x100000},
        '__GFP_DIRECT_RECLAIM': {'value': 0x400000},
        '__GFP_WRITE':          {'value': 0x800000},
        '__GFP_KSWAPD_RECLAIM': {'value': 0x1000000},
        '__GFP_NOLOCKDEP':      {'value': 0x2000000},
        '__GFP_RECLAIM':        {'value': '__GFP_DIRECT_RECLAIM|__GFP_KSWAPD_RECLAIM'},
    }
    """
    Definition of GFP flags

    The decimal value of a flag will be calculated by evaluating the entries from left to right. Grouping by
    parentheses is not supported.

    Source: include/linux/gpf.h

    @note : This list os probably a mixture of different kernel versions - be carefully

    @todo: Implement kernel specific versions because this flags are not constant
          (see https://github.com/torvalds/linux/commit/e67d4ca79aaf9d13a00d229b1b1c96b86828e8ba#diff-020720d0699e3ae1afb6fcd815ca8500)
    """

    ps_table_items = ['pid', 'uid', 'tgid', 'total_vm_pages', 'rss_pages', 'nr_ptes_pages', 'swapents_pages',
                      'oom_score_adj']
    """Elements of the process table"""

    REC_PROCESS_LINE = re.compile(
        r'^\[(?P<pid>[ \d]+)\]\s+(?P<uid>\d+)\s+(?P<tgid>\d+)\s+(?P<total_vm_pages>\d+)\s+(?P<rss_pages>\d+)\s+'
        r'(?P<nr_ptes_pages>\d+)\s+(?P<swapents_pages>\d+)\s+(?P<oom_score_adj>-?\d+)\s+(?P<name>.+)\s*')
    """Match content of process table"""

    rec_version4kconfig = re.compile('.+')
    """RE to match kernel version to kernel configuration"""

    rec_oom_begin = re.compile(r'invoked oom-killer:', re.MULTILINE)
    """RE to match the first line of an OOM block"""

    rec_oom_end = re.compile(r'^Killed process \d+', re.MULTILINE)
    """RE to match the last line of an OOM block"""

    def __init__(self):
        super().__init__()

        if self.EXTRACT_PATTERN is None:
            # Create a copy to prevent modifications on the class dictionary
            # TODO replace with self.EXTRACT_PATTERN = self.EXTRACT_PATTERN.copy() after
            #      https://github.com/QQuick/Transcrypt/issues/716 "dict does not have a copy method" is fixed
            self.EXTRACT_PATTERN = {}
            self.EXTRACT_PATTERN.update(self.EXTRACT_PATTERN_BASE)

        if self.EXTRACT_PATTERN_OVERLAY:
            self.EXTRACT_PATTERN.update(self.EXTRACT_PATTERN_OVERLAY)


class KernelConfig_4_6(BaseKernelConfig):
    # Support changes:
    #  * "mm, oom_reaper: report success/failure" (bc448e897b6d24aae32701763b8a1fe15d29fa26)

    name = 'Configuration for Linux kernel 4.6 or later'
    rec_version4kconfig = re.compile(r'^4\.([6-9]\.|[12][0-9]\.).+')

    # The "oom_reaper" line is optionally
    rec_oom_end = re.compile(r'^((Out of memory.*|Memory cgroup out of memory): Killed process \d+|oom_reaper:)',
                             re.MULTILINE)

    def __init__(self):
        super().__init__()


class KernelConfig_4_9(KernelConfig_4_6):
    # Support changes:
    # * "mm: oom: deduplicate victim selection code for memcg and global oom" (7c5f64f84483bd13886348edda8b3e7b799a7fdb)

    name = 'Configuration for Linux kernel 4.9 or later'
    rec_version4kconfig = re.compile(r'^4\.([9]\.|[12][0-9]\.).+')

    EXTRACT_PATTERN_OVERLAY_49 = {
        'Details of process killed by OOM': (
            r'^(Out of memory.*|Memory cgroup out of memory): Killed process \d+ \(.*\)'
            r'(, UID \d+,)?'
            r' total-vm:(?P<killed_proc_total_vm_kb>\d+)kB, anon-rss:(?P<killed_proc_anon_rss_kb>\d+)kB, '
            r'file-rss:(?P<killed_proc_file_rss_kb>\d+)kB, shmem-rss:(?P<killed_proc_shmem_rss_kb>\d+)kB.*',
            True,
        ),
    }

    def __init__(self):
        super().__init__()
        self.EXTRACT_PATTERN.update(self.EXTRACT_PATTERN_OVERLAY_49)


class KernelConfig_5_0(KernelConfig_4_9):
    # Support changes:
    #  * "mm, oom: reorganize the oom report in dump_header" (ef8444ea01d7442652f8e1b8a8b94278cb57eafd)

    name = 'Configuration for Linux kernel 5.0 or later'
    rec_version4kconfig = re.compile(r'^[5-9]\..+')

    EXTRACT_PATTERN_OVERLAY_50 = {
        # third last line - not integrated yet
        # oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/,task=sed,pid=29481,uid=12345

        'Process killed by OOM': (
            r'^Out of memory: Killed process (?P<killed_proc_pid>\d+) \((?P<killed_proc_name>[\S ]+)\) '
            r'total-vm:(?P<killed_proc_total_vm_kb>\d+)kB, anon-rss:(?P<killed_proc_anon_rss_kb>\d+)kB, '
            r'file-rss:(?P<killed_proc_file_rss_kb>\d+)kB, shmem-rss:(?P<killed_proc_shmem_rss_kb>\d+)kB, '
            r'UID:\d+ pgtables:(?P<killed_proc_pgtables>\d+)kB oom_score_adj:(?P<killed_proc_oom_score_adj>\d+)',
            True,
        ),
    }

    def __init__(self):
        super().__init__()
        self.EXTRACT_PATTERN.update(self.EXTRACT_PATTERN_OVERLAY_50)


class KernelConfig_5_8(KernelConfig_5_0):
    # Support changes:
    #  * "mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead" (8d92890bd6b8502d6aee4b37430ae6444ade7a8c)

    name = 'Configuration for Linux kernel 5.8 or later'

    rec_version4kconfig = re.compile(r'^(5\.[8-9]\.|5\.[1-9][0-9]\.|[6-9]\.).+')

    EXTRACT_PATTERN_OVERLAY_58 = {
        'Mem-Info (part 1)': (
            r'^Mem-Info:.*'
            r'(?:\n)'

            # first line (starting w/o a space)
            r'^active_anon:(?P<active_anon_pages>\d+) inactive_anon:(?P<inactive_anon_pages>\d+) '
            r'isolated_anon:(?P<isolated_anon_pages>\d+)'
            r'(?:\n)'
        
            # remaining lines (w/ leading space)
            r'^ active_file:(?P<active_file_pages>\d+) inactive_file:(?P<inactive_file_pages>\d+) '
            r'isolated_file:(?P<isolated_file_pages>\d+)'
            r'(?:\n)'
        
            r'^ unevictable:(?P<unevictable_pages>\d+) dirty:(?P<dirty_pages>\d+) writeback:(?P<writeback_pages>\d+)',
            True,
        ),
    }

    def __init__(self):
        super().__init__()
        self.EXTRACT_PATTERN.update(self.EXTRACT_PATTERN_OVERLAY_58)


class KernelConfigRhel7(BaseKernelConfig):
    """RHEL7 / CentOS7 specific configuration"""

    name = 'Configuration for RHEL7 / CentOS7 specific Linux kernel (3.10)'

    rec_version4kconfig = re.compile(r'^3\..+')

    def __init__(self):
        super().__init__()


AllKernelConfigs = [
    KernelConfig_5_8(),
    KernelConfig_5_0(),
    KernelConfig_4_9(),
    KernelConfig_4_6(),
    KernelConfigRhel7(),
    BaseKernelConfig(),
]
"""
Instances of all available kernel configurations.

The last entry in this list is the base configuration as a fallback.

@type: List(BaseKernelConfig)
"""


class OOMEntity:
    """Hold whole OOM message block and provide access"""

    current_line = 0
    """Zero based index of the current line in self.lines"""

    lines = []
    """OOM text as list of lines"""

    state = OOMEntityState.unknown
    """State of the OOM after initial parsing"""

    text = ""
    """OOM as text"""

    def __init__(self, text):
        # use Unix LF only
        text = text.replace('\r\n', '\r')
        text = text.strip()
        oom_lines = text.split('\n')

        self.current_line = 0
        self.lines = oom_lines
        self.text = text

        # don't do anything if the text is empty or does not contains the leading OOM message
        if not text:
            self.state = OOMEntityState.empty
            return
        elif 'invoked oom-killer:' not in text:
            self.state = OOMEntityState.invalid
            return

        oom_lines = self._remove_non_oom_lines(oom_lines)
        oom_lines = self._remove_kernel_colon(oom_lines)
        cols_to_strip = self._number_of_columns_to_strip(oom_lines[self._get_CPU_index(oom_lines)])
        oom_lines = self._journalctl_add_leading_columns_to_meminfo(oom_lines, cols_to_strip)
        oom_lines = self._strip_needless_columns(oom_lines, cols_to_strip)
        oom_lines = self._rsyslog_unescape_lf(oom_lines)

        self.lines = oom_lines
        self.text = '\n'.join(oom_lines)

        if 'Killed process' in text:
            self.state = OOMEntityState.complete
        else:
            self.state = OOMEntityState.started

    def _journalctl_add_leading_columns_to_meminfo(self, oom_lines, cols_to_add):
        """
        Add leading columns to handle line breaks in journalctl output correctly.

        The output of the "Mem-Info:" block contains line breaks. journalctl breaks these lines accordingly, but
        inserts at the beginning spaces instead of date and time. As a result, removing the needless columns no longer
        works correctly.

        This function adds columns back in the affected rows so that the removal works cleanly over all rows.

        @see: _rsyslog_unescape_lf()
        """
        pattern = r'^\s+ (active_file|unevictable|slab_reclaimable|mapped|free):.+$'
        rec = re.compile(pattern)

        add_cols = ""
        for i in range(cols_to_add):
            add_cols += "Col{} ".format(i)

        expanded_lines = []
        for line in oom_lines:
            match = rec.search(line)
            if match:
                line = "{} {}".format(add_cols, line.strip())
            expanded_lines.append(line)

        return expanded_lines

    def _get_CPU_index(self, lines):
        """
        Return the index of the first line with "CPU: "

        Depending on the OOM version the "CPU: " pattern is in second or third oom line.
        """
        for i in range(len(lines)):
            if 'CPU: ' in lines[i]:
                return i

        return 0

    def _number_of_columns_to_strip(self, line):
        """
        Determinate number of columns left to the OOM message to strip.

        Sometime timestamps, hostnames and or syslog tags are left to the OOM message. This columns will be count to
        strip later.
        """
        to_strip = 0
        columns = line.split(" ")

        # Examples:
        # [11686.888109] CPU: 4 PID: 29481 Comm: sed Not tainted 3.10.0-514.6.1.el7.x86_64 #1
        # Apr 01 14:13:32 mysrv kernel: CPU: 4 PID: 29481 Comm: sed Not tainted 3.10.0-514.6.1.el7.x86_64 #1
        # Apr 01 14:13:32 mysrv kernel: [11686.888109] CPU: 4 PID: 29481 Comm: sed Not tainted 3.10.0-514.6.1.el7.x86_64 #1
        try:
            # strip all excl. "CPU:"
            if 'CPU:' in line:
                to_strip = columns.index("CPU:")
        except ValueError:
            pass

        return to_strip

    def _remove_non_oom_lines(self, oom_lines):
        """Remove all lines before and after OOM message block"""
        cleaned_lines = []
        in_oom_lines = False
        killed_process = False

        for line in oom_lines:
            # first line of the oom message block
            if "invoked oom-killer:" in line:
                in_oom_lines = True

            if in_oom_lines:
                cleaned_lines.append(line)

            # OOM blocks ends with the second last only or both lines
            #   Out of memory: Killed process ...
            #   oom_reaper: reaped process ...
            if 'Killed process' in line:
                killed_process = True
                continue

            # next line after "Killed process \d+ ..."
            if killed_process:
                if 'oom_reaper' in line:
                    break
                else:
                    # remove this line
                    del cleaned_lines[-1]
                    break

        return cleaned_lines

    def _rsyslog_unescape_lf(self, oom_lines):
        """
        Split lines at '#012' (octal representation of LF).

        The output of the "Mem-Info:" block contains line breaks. Rsyslog replaces these line breaks with their octal
        representation #012. This breaks the removal of needless columns as well as the detection of the OOM values.

        Splitting the lines (again) solves this issue.

        This feature can be controlled inside the rsyslog configuration with the directives
        $EscapeControlCharactersOnReceive, $Escape8BitCharactersOnReceive and $ControlCharactersEscapePrefix.

        @see: _journalctl_add_leading_columns_to_meminfo()
        """
        lines = []

        for line in oom_lines:
            if '#012' in line:
                lines.extend(line.split('#012'))
            else:
                lines.append(line)

        return lines

    def _remove_kernel_colon(self, oom_lines):
        """
        Remove the "kernel:" pattern w/o leading and tailing spaces.

        Some OOM messages don't have a space between "kernel:" and the process name. _strip_needless_columns() will
        fail in such cases. Therefore the pattern is removed.
        """
        oom_lines = [i.replace('kernel:', '') for i in oom_lines]
        return oom_lines

    def _strip_needless_columns(self, oom_lines, cols_to_strip=0):
        """
        Remove needless columns at the start of every line.

        This function removes all leading items w/o any relation to the OOM message like, date and time, hostname,
        syslog priority/facility.
        """
        stripped_lines = []
        for line in oom_lines:
            # remove empty lines
            if not line.strip():
                continue

            if cols_to_strip:
                # [-1] slicing needs Transcrypt operator overloading
                line = line.split(" ", cols_to_strip)[-1]  # __:opov
            stripped_lines.append(line)

        return stripped_lines

    def back(self):
        """Return the previous line"""
        if self.current_line - 1 < 0:
            raise StopIteration()
        self.current_line -= 1
        return self.lines[self.current_line]

    def current(self):
        """Return the current line"""
        return self.lines[self.current_line]

    def next(self):
        """Return the next line"""
        if self.current_line + 1 < len(self.lines):
            self.current_line += 1
            return self.lines[self.current_line]
        raise StopIteration()

    def find_text(self, pattern):
        """
        Search the pattern and set the position to the first found line.
        Otherwise the position pointer won't be changed.

        :param pattern: Text to find
        :type pattern: str

        :return: True if the marker has found.
        """
        for line in self.lines:
            if pattern in line:
                self.current_line = self.lines.index(line)
                return True
        return False

    def __iter__(self):
        return self

    def __next__(self):
        return self.next()


class OOMResult:
    """Results of an OOM analysis"""

    kconfig = BaseKernelConfig()
    """Kernel configuration"""

    details = {}
    """Extracted result"""

    oom_entity = None
    """
    State of this OOM (unknown, incomplete, ...)
    
    :type: OOMEntityState
    """

    oom_type = OOMEntityType.unknown
    """
    Type of this OOM (manually or automatically triggered)
    
    :type: OOMEntityType
    """

    error_msg = ""
    """
    Error message
    
    @type: str
    """

    kversion = None
    """
    Kernel version
    
    @type: str
    """

    oom_text = None
    """
    OOM text
    
    @type: str
    """

    swap_active = False
    """
    Swap space active or inactive
    
    @type: bool
    """


class OOMAnalyser:
    """Analyse an OOM object and calculate additional values"""

    oom_entity = None
    """
    State of this OOM (unknown, incomplete, ...)
    
    :type: OOMEntityState
    """

    oom_result = OOMResult()
    """
    Store details of OOM analysis
    
    :type: OOMResult
    """

    def __init__(self, oom):
        self.oom_entity = oom
        self.oom_result = OOMResult()

    def _identify_kernel_version(self):
        """
        Identify the used kernel version and

        @rtype: bool
        """
        pattern = r'CPU: \d+ PID: \d+ Comm: .* (Not tainted|Tainted: [A-Z ]+) (?P<kernel_version>\d[\w.-]+) #.+'
        rec = re.compile(pattern, re.MULTILINE)
        match = rec.search(self.oom_entity.text)
        if not match:
            self.oom_result.error_msg = 'Failed to extract kernel version from OOM text'
            return False
        self.oom_result.kversion = match.group('kernel_version')
        return True

    def _choose_kernel_config(self):
        """
        Select proper kernel configuration

        @rtype: bool
        """
        for kcfg in AllKernelConfigs:
            match = kcfg.rec_version4kconfig.match(self.oom_result.kversion)
            if match:
                self.oom_result.kconfig = kcfg
                break

        if not self.oom_result.kconfig:
            warning('Failed to find a proper configuration for kernel "{}"'.format(self.oom_result.kversion))
            self.oom_result.kconfig = BaseKernelConfig()
        return True

    def _check_for_empty_oom(self):
        """
        Check for an empty OOM text

        @rtype: bool
        """
        if not self.oom_entity.text:
            self.state = OOMEntityState.empty
            self.oom_result.error_msg = 'Empty OOM text. Please insert an OOM message block.'
            return False
        return True

    def _check_for_complete_oom(self):
        """
        Check if the OOM in self.oom_entity is complete and update self.oom_state accordingly

        @rtype: bool
        """
        self.oom_state = OOMEntityState.unknown
        self.oom_result.error_msg = 'Unknown OOM format'

        if not self.oom_result.kconfig.rec_oom_begin.search(self.oom_entity.text):
            self.state = OOMEntityState.invalid
            self.oom_result.error_msg = 'The inserted text is not a valid OOM block! The initial pattern was not found!'
            return False

        if not self.oom_result.kconfig.rec_oom_end.search(self.oom_entity.text):
            self.state = OOMEntityState.started
            self.oom_result.error_msg = 'The inserted OOM is incomplete! The initial pattern was found but not the '\
                                        'final.'
            return False

        self.state = OOMEntityState.complete
        self.oom_result.error_msg = None
        return True

    def _extract_block_from_next_pos(self, marker):
        """
        Extract a block that starts with the marker and contains all lines up to the next line with ":".
        :rtype: str
        """
        block = ''
        if not self.oom_entity.find_text(marker):
            return block

        line = self.oom_entity.current()
        block += "{}\n".format(line)
        for line in self.oom_entity:
            if ':' in line:
                self.oom_entity.back()
                break
            block += "{}\n".format(line)
        return block

    def _extract_from_oom_text(self):
        """Extract details from OOM message text"""

        self.oom_result.details = {}
        # __pragma__ ('jsiter')
        for k in self.oom_result.kconfig.EXTRACT_PATTERN:
            pattern, is_mandatory = self.oom_result.kconfig.EXTRACT_PATTERN[k]
            rec = re.compile(pattern, re.MULTILINE)
            match = rec.search(self.oom_entity.text)
            if match:
                self.oom_result.details.update(match.groupdict())
            elif is_mandatory:
                error('Failed to extract information from OOM text. The regular expression "{}" (pattern "{}") '
                      'does not find anything. This can lead to errors later on.'.format(k, pattern))
        # __pragma__ ('nojsiter')

        if self.oom_result.details['trigger_proc_order'] == "-1":
            self.oom_result.oom_type = OOMEntityType.manual
        else:
            self.oom_result.oom_type = OOMEntityType.automatic

        self.oom_result.details['hardware_info'] = self._extract_block_from_next_pos('Hardware name:')

        # strip "Call Trace" line at beginning and remove leading spaces
        call_trace = ''
        block = self._extract_block_from_next_pos('Call Trace:')
        for line in block.split('\n'):
            if line.startswith('Call Trace'):
                continue
            call_trace += "{}\n".format(line.strip())
        self.oom_result.details['call_trace'] = call_trace

        # extract process table
        self.oom_result.details['_ps'] = {}
        self.oom_entity.find_text('[ pid ]')
        for line in self.oom_entity:
            if not line.startswith('['):
                break
            if line.startswith('[ pid ]'):
                continue
            match = self.oom_result.kconfig.REC_PROCESS_LINE.match(line)
            if match:
                details = match.groupdict()
                details['notes'] = ''
                pid = details.pop('pid')
                self.oom_result.details['_ps'][pid] = {}
                self.oom_result.details['_ps'][pid].update(details)

    def _hex2flags(self, hexvalue, flag_definition):
        """\
        Convert the hexadecimal value into flags specified by definition

        @return: list of flags and the decimal sum of all unknown flags
        """
        remaining = int(hexvalue, 16)
        converted_flags = []

        # __pragma__ ('jsiter')
        for flag in flag_definition:
            value = self._flag2decimal(flag, flag_definition)
            if remaining & value:
                # delete flag by "and" with a reverted mask
                remaining &= ~value
                converted_flags.append(flag)
        # __pragma__ ('nojsiter')

        return converted_flags, remaining

    def _flag2decimal(self, flag, flag_definition):
        """\
        Convert a single flag into a decimal value
        """
        if flag not in flag_definition:
            error('No definition for flag {} found'.format(flag))
            return 0

        value = flag_definition[flag]['value']
        if isinstance(value, int):
            return value

        tokenlist = iter(re.split('([|&])', value))
        operator = None
        negate_rvalue = False
        lvalue = 0
        while True:
            try:
                token = next(tokenlist)
            except StopIteration:
                break
            token = token.strip()
            if token in ['|', '&']:
                operator = token
                continue

            if token.startswith('~'):
                token = token[1:]
                negate_rvalue = True

            if token.isdigit():
                rvalue = int(token)
            elif token.startswith('0x') and token[2:].isdigit():
                rvalue = int(token, 16)
            else:
                # it's not a decimal nor a hexadecimal value - reiterate assuming it's a flag string
                rvalue = self._flag2decimal(token, flag_definition)

            if negate_rvalue:
                rvalue = ~rvalue

            if operator == '|':
                lvalue |= rvalue
            elif operator == '&':
                lvalue &= rvalue

            operator = None
            negate_rvalue = False

        return lvalue

    def _convert_numeric_results_to_integer(self):
        """Convert all *_pages and *_kb to integer"""
        # __pragma__ ('jsiter')
        for item in self.oom_result.details:
            if self.oom_result.details[item] is None:
                self.oom_result.details[item] = '<not found>'
                continue
            if item.endswith('_kb') or item.endswith('_pages') or item.endswith('_pid') or \
                    item in ['killed_proc_score', 'trigger_proc_order', 'trigger_proc_oomscore']:
                try:
                    self.oom_result.details[item] = int(self.oom_result.details[item])
                except:
                    error('Converting item "{}={}" to integer failed'.format(item, self.oom_result.details[item]))

        # __pragma__ ('nojsiter')

    def _convert_numeric_process_values_to_integer(self):
        """Convert numeric values in process table to integer values"""
        ps = self.oom_result.details['_ps']
        ps_index = []
        # TODO Check if transcrypt issue: pragma jsiter for the whole block "for pid_str in ps: ..."
        #      sets item in "for item in ['uid',..." to 0 instead of 'uid'
        #      jsiter is necessary to iterate over ps
        for pid_str in ps.keys():
            converted = {}
            process = ps[pid_str]
            for item in self.oom_result.kconfig.ps_table_items:
                if item == 'pid':
                    continue
                try:
                    converted[item] = int(process[item])
                except:
                    error('Converting process parameter "{}={}" to integer failed'.format(item, process[item]))

            converted['name'] = process['name']
            converted['notes'] = process['notes']
            pid_int = int(pid_str)
            del ps[pid_str]
            ps[pid_int] = converted
            ps_index.append(pid_int)

        ps_index.sort(key=int)
        self.oom_result.details['_ps_index'] = ps_index

    def _calc_pstable_values(self):
        """Set additional notes to processes listed in the process table"""
        tpid = self.oom_result.details['trigger_proc_pid']
        kpid = self.oom_result.details['killed_proc_pid']

        # sometimes the trigger process isn't part of the process table
        if tpid in self.oom_result.details['_ps']:
            self.oom_result.details['_ps'][tpid]['notes'] = 'trigger process'

        # assume the killed process may also not part of the process table
        if kpid in self.oom_result.details['_ps']:
            self.oom_result.details['_ps'][kpid]['notes'] = 'killed process'

    def _calc_trigger_process_values(self):
        """Calculate all values related with the trigger process"""
        self.oom_result.details['trigger_proc_requested_memory_pages'] = 2 ** self.oom_result.details['trigger_proc_order']
        self.oom_result.details['trigger_proc_requested_memory_pages_kb'] = self.oom_result.details['trigger_proc_requested_memory_pages'] * \
                                                                            self.oom_result.details['page_size_kb']
        # process gfp_mask
        if self.oom_result.details['trigger_proc_gfp_flags'] != '<not found>':     # None has been is converted to '<not found>'
            flags = self.oom_result.details['trigger_proc_gfp_flags']
            del self.oom_result.details['trigger_proc_gfp_flags']
        else:
            flags, unknown = self._hex2flags(self.oom_result.details['trigger_proc_gfp_mask'], self.oom_result.kconfig.GFP_FLAGS)
            if unknown:
                flags.append('0x{0:x}'.format(unknown))
            flags = ' | '.join(flags)

        self.oom_result.details['trigger_proc_gfp_mask'] = '{} ({})'.format(self.oom_result.details['trigger_proc_gfp_mask'], flags)
        # already fully processed and no own element to display -> delete otherwise an error msg will be shown
        del self.oom_result.details['trigger_proc_gfp_flags']

    def _calc_killed_process_values(self):
        """Calculate all values related with the killed process"""
        self.oom_result.details['killed_proc_total_rss_kb'] = self.oom_result.details['killed_proc_anon_rss_kb'] + \
                                                              self.oom_result.details['killed_proc_file_rss_kb'] + \
                                                              self.oom_result.details['killed_proc_shmem_rss_kb']

        self.oom_result.details['killed_proc_rss_percent'] = int(100 *
                                                                 self.oom_result.details['killed_proc_total_rss_kb'] /
                                                                 int(self.oom_result.details['system_total_ram_kb']))

    def _calc_swap_values(self):
        """Calculate all swap related values"""
        try:
            self.oom_result.swap_active = self.oom_result.details['swap_total_kb'] > 0
        except KeyError:
            self.oom_result.swap_active = False

        if not self.oom_result.swap_active:
            return

        self.oom_result.details['swap_cache_kb'] = self.oom_result.details['swap_cache_pages'] * self.oom_result.details['page_size_kb']
        del self.oom_result.details['swap_cache_pages']

        #  SwapUsed = SwapTotal - SwapFree - SwapCache
        self.oom_result.details['swap_used_kb'] = self.oom_result.details['swap_total_kb'] - self.oom_result.details['swap_free_kb'] - \
                                                  self.oom_result.details['swap_cache_kb']
        self.oom_result.details['system_swap_used_percent'] = int(100 *
                                                                  self.oom_result.details['swap_total_kb'] /
                                                                  self.oom_result.details['swap_used_kb'])

    def _calc_system_values(self):
        """Calculate system memory"""

        # educated guess
        self.oom_result.details['page_size_kb'] = 4

        # calculate remaining explanation values
        self.oom_result.details['system_total_ram_kb'] = self.oom_result.details['ram_pages'] * self.oom_result.details['page_size_kb']
        if self.oom_result.swap_active:
            self.oom_result.details['system_total_ramswap_kb'] = self.oom_result.details['system_total_ram_kb'] + \
                                                                 self.oom_result.details['swap_total_kb']
        else:
            self.oom_result.details['system_total_ramswap_kb'] = self.oom_result.details['system_total_ram_kb']
        total_rss_pages = 0
        for pid in self.oom_result.details['_ps'].keys():
            total_rss_pages += self.oom_result.details['_ps'][pid]['rss_pages']
        self.oom_result.details['system_total_ram_used_kb'] = total_rss_pages * self.oom_result.details['page_size_kb']

        self.oom_result.details['system_total_used_percent'] = int(100 *
                                                                   self.oom_result.details['system_total_ram_used_kb'] /
                                                                   self.oom_result.details['system_total_ram_kb'])

    def _determinate_platform_and_distribution(self):
        """Determinate platform and distribution"""
        kernel_version = self.oom_result.details.get('kernel_version', '')
        if 'x86_64' in kernel_version:
            self.oom_result.details['platform'] = 'x86 64bit'
        else:
            self.oom_result.details['platform'] = 'unknown'

        dist = 'unknown'
        if '.el7uek' in kernel_version:
            dist = 'Oracle Linux 7 (Unbreakable Enterprise Kernel)'
        elif '.el7' in kernel_version:
            dist = 'RHEL 7/CentOS 7'
        elif '.el6' in kernel_version:
            dist = 'RHEL 6/CentOS 6'
        elif '.el5' in kernel_version:
            dist = 'RHEL 5/CentOS 5'
        elif 'ARCH' in kernel_version:
            dist = 'Arch Linux'
        elif '-generic' in kernel_version:
            dist = 'Ubuntu'
        self.oom_result.details['dist'] = dist

    def _calc_from_oom_details(self):
        """
        Calculate values from already extracted details

        @see: self.details
        """
        self._convert_numeric_results_to_integer()
        self._convert_numeric_process_values_to_integer()
        self._calc_pstable_values()

        self._determinate_platform_and_distribution()
        self._calc_system_values()
        self._calc_trigger_process_values()
        self._calc_killed_process_values()
        self._calc_swap_values()

    def analyse(self):
        """
        Extract and calculate values from the given OOM object

        If the return value is False, the OOM is too incomplete to perform an analysis.

        @rtype: bool
        """
        if not self._check_for_empty_oom():
            error(self.oom_result.error_msg)
            return False

        if not self._identify_kernel_version():
            error(self.oom_result.error_msg)
            return False

        if not self._choose_kernel_config():
            error(self.oom_result.error_msg)
            return False

        if not self._check_for_complete_oom():
            error(self.oom_result.error_msg)
            return False

        self._extract_from_oom_text()
        self._calc_from_oom_details()
        self.oom_result.oom_text = self.oom_entity.text

        return True


class OOMDisplay:
    """Display the OOM analysis"""

    # result ergibt an manchen stellen self.result.result :-/
    oom_result = OOMResult()
    """
    OOM analysis details
    
    @rtype: OOMResult
    """

    example_rhel7 = u'''\
sed invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0
sed cpuset=/ mems_allowed=0-1
CPU: 4 PID: 29481 Comm: sed Not tainted 3.10.0-514.6.1.el7.x86_64 #1
Hardware name: HP ProLiant DL385 G7, BIOS A18 12/08/2012
 ffff880182272f10 00000000021dcb0a ffff880418207938 ffffffff816861ac
 ffff8804182079c8 ffffffff81681157 ffffffff810eab9c ffff8804182fe910
 ffff8804182fe928 0000000000000202 ffff880182272f10 ffff8804182079b8
Call Trace:
 [<ffffffff816861ac>] dump_stack+0x19/0x1b
 [<ffffffff81681157>] dump_header+0x8e/0x225
 [<ffffffff810eab9c>] ? ktime_get_ts64+0x4c/0xf0
 [<ffffffff8113ccaf>] ? delayacct_end+0x8f/0xb0
 [<ffffffff8118475e>] oom_kill_process+0x24e/0x3c0
 [<ffffffff811841fd>] ? oom_unkillable_task+0xcd/0x120
 [<ffffffff811842a6>] ? find_lock_task_mm+0x56/0xc0
 [<ffffffff810937ee>] ? has_capability_noaudit+0x1e/0x30
 [<ffffffff81184f96>] out_of_memory+0x4b6/0x4f0
 [<ffffffff81681c60>] __alloc_pages_slowpath+0x5d7/0x725
 [<ffffffff8118b0a5>] __alloc_pages_nodemask+0x405/0x420
 [<ffffffff811cf25a>] alloc_pages_current+0xaa/0x170
 [<ffffffff81180667>] __page_cache_alloc+0x97/0xb0
 [<ffffffff811831b0>] filemap_fault+0x170/0x410
 [<ffffffffa018f016>] ext4_filemap_fault+0x36/0x50 [ext4]
 [<ffffffff811ac2ec>] __do_fault+0x4c/0xc0
 [<ffffffff811ac783>] do_read_fault.isra.42+0x43/0x130
 [<ffffffff811b0f11>] handle_mm_fault+0x6b1/0xfe0
 [<ffffffff811b7825>] ? do_mmap_pgoff+0x305/0x3c0
 [<ffffffff81691c94>] __do_page_fault+0x154/0x450
 [<ffffffff81691fc5>] do_page_fault+0x35/0x90
 [<ffffffff8168e288>] page_fault+0x28/0x30
Mem-Info:
active_anon:7355653 inactive_anon:660960 isolated_anon:0#012 active_file:1263 inactive_file:1167 isolated_file:32#012 unevictable:0 dirty:4 writeback:0 unstable:0#012 slab_reclaimable:27412 slab_unreclaimable:13708#012 mapped:4818 shmem:87896 pagetables:25222 bounce:0#012 free:39513 free_pcp:2958 free_cma:0
Node 0 DMA free:15872kB min:40kB low:48kB high:60kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes lowmem_reserve[]: 0 2780 15835 15835
Node 0 DMA32 free:59728kB min:7832kB low:9788kB high:11748kB active_anon:2154380kB inactive_anon:604748kB active_file:500kB inactive_file:112kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3094644kB managed:2848912kB mlocked:0kB dirty:0kB writeback:0kB mapped:4016kB shmem:5140kB slab_reclaimable:6448kB slab_unreclaimable:2796kB kernel_stack:1040kB pagetables:6876kB unstable:0kB bounce:0kB free_pcp:3788kB local_pcp:228kB free_cma:0kB writeback_tmp:0kB pages_scanned:28 all_unreclaimable? no lowmem_reserve[]: 0 0 13055 13055
Node 0 Normal free:36692kB min:36784kB low:45980kB high:55176kB active_anon:12301636kB inactive_anon:793132kB active_file:604kB inactive_file:176kB unevictable:0kB isolated(anon):0kB isolated(file):128kB present:13631488kB managed:13368348kB mlocked:0kB dirty:0kB writeback:0kB mapped:4108kB shmem:207940kB slab_reclaimable:47900kB slab_unreclaimable:28884kB kernel_stack:6624kB pagetables:43340kB unstable:0kB bounce:0kB free_pcp:4204kB local_pcp:640kB free_cma:0kB writeback_tmp:0kB pages_scanned:128 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0
Node 1 Normal free:49436kB min:45444kB low:56804kB high:68164kB active_anon:14967844kB inactive_anon:1244560kB active_file:1552kB inactive_file:1992kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:16777212kB managed:16514220kB mlocked:0kB dirty:16kB writeback:0kB mapped:10760kB shmem:138504kB slab_reclaimable:55300kB slab_unreclaimable:23152kB kernel_stack:6176kB pagetables:50672kB unstable:0kB bounce:0kB free_pcp:3360kB local_pcp:248kB free_cma:0kB writeback_tmp:0kB pages_scanned:125777 all_unreclaimable? yes lowmem_reserve[]: 0 0 0 0
Node 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15872kB
Node 0 DMA32: 203*4kB (UEM) 231*8kB (UEM) 259*16kB (UEM) 231*32kB (UEM) 157*64kB (UEM) 90*128kB (UEM) 49*256kB (UEM) 20*512kB (UE) 3*1024kB (UEM) 1*2048kB (M) 0*4096kB = 63668kB
Node 0 Normal: 1231*4kB (UEM) 391*8kB (UEM) 456*16kB (UEM) 342*32kB (UEM) 141*64kB (UEM) 23*128kB (UEM) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 38260kB
Node 1 Normal: 2245*4kB (UEM) 732*8kB (UEM) 594*16kB (UEM) 396*32kB (UEM) 160*64kB (UEM) 16*128kB (UEM) 2*256kB (UM) 0*512kB 1*1024kB (M) 0*2048kB 0*4096kB = 50836kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
Node 1 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
100155 total pagecache pages
11342 pages in swap cache
Swap cache stats: add 31260615, delete 31249273, find 295999950/297583545
Free swap  = 0kB
Total swap = 8388604kB
8379834 pages RAM
0 pages HighMem/MovableOnly
192987 pages reserved
[ pid ]   uid  tgid total_vm      rss nr_ptes swapents oom_score_adj name
[  390]     0   390    39012     6739      78       51             0 systemd-journal
[  433]     0   433    11104        2      22      360         -1000 systemd-udevd
[  530]     0   530    13854       28      27       83         -1000 auditd
[  559]     0   559     7692       65      19       87             0 systemd-logind
[  563]     0   563     4817       41      14       36             0 irqbalance
[  569]    87   569     7684       52      20       48          -900 dbus-daemon
[  587]    32   587    16240       17      34      116             0 rpcbind
[  647]     0   647    50303       11      36      113             0 gssproxy
[  796]     0   796   193856     2897     207      112             0 rsyslogd
[  818]     0   818    13177        0      27      146             0 vsftpd
[  840]     0   840    62892        9      36      103             0 ypbind
[  868]     0   868    21663       28      43      191         -1000 sshd
[  871]    29   871    11126        2      25      222             0 rpc.statd
[  907]     0   907     8044        4      21       53             0 atd
[  916]     0   916    27509        2      10       30             0 agetty
[  934]     0   934    27509        2      10       31             0 agetty
[ 1255]     0  1255    45716        1      39      337             0 rscd
[ 1268]     0  1268    45746       28      38      353             0 rscd
[ 1269]     0  1269    45716       29      38      311             0 rscd
[ 1285]     0  1285    23290       25      45      235             0 master
[ 1287]    89  1287    23379       52      47      242             0 qmgr
[ 1830]     0  1830   446643      959      68     1234             0 ovcd
[ 2062]     0  2062   144894      511      37      309             0 ovbbccb
[ 2121]     0  2121    33138       26      19      138             0 crond
[ 2136]    38  2136     7846       40      19       88             0 ntpd
[ 2451]     0  2451   177827        0      36      816             0 ovconfd
[ 8145]     0  8145   300303     1616      58      692             0 hpsensor
[ 8204]     0  8204    31508      119      31      328             0 opcmsgi
[ 8405]     0  8405   201479     1289      49      244             0 opcmsga
[ 8472]     0  8472   134080      236      46      514             0 opcmona
[ 8596]     0  8596    31377      172      29      301             0 opcle
[ 8658]     0  8658    81199      124      34      336             0 opcacta
[ 8685]     0  8685   137169    23313      97     3256             0 oacore
[ 6330] 12345  6330     7520       15      18       61             0 rotatelogs
[ 6331] 12345  6331    28318        0      12       83             0 run.sh
[ 6576] 12345  6576  8478546  5157063   15483  1527848             0 mysqld
[27171] 12345 27171     7522       10      18       58             0 rotatelogs
[27172] 12345 27172    28320        3      11       94             0 run.sh
[27502] 12345 27502  4029300  2716569    6505   226225             0 java
[11729]     0 11729    64122     5003      79     2465             0 snmpd
[12130]     0 12130   122202      565      29      175             0 hpasmlited
[12166]     0 12166    11905       89      24      121             0 cmahealthd
[12190]     0 12190    11871       89      24      119             0 cmastdeqd
[12214]     0 12214    13707       84      31      211             0 cmahostd
[12237]     0 12237    12493       38      28      352             0 cmathreshd
[12276]     0 12276    12368       45      30      210             0 cmasm2d
[12299]     0 12299    12485       43      26      282             0 cmaperfd
[12324]     0 12324    31932      184      31      143             0 cmapeerd
[12352]     0 12352    14280       48      32      169             0 cmaeventd
[12379]     0 12379    14831       26      30      198             0 cmafcad
[12407]     0 12407    11806       12      25      128             0 cmasasd
[12436]     0 12436    14364       86      31      181             0 cmaidad
[12463]     0 12463    11288       15      25      125             0 cmaided
[12492]     0 12492    11805       14      26      127             0 cmascsid
[12523]     0 12523    92228      129      63      433             0 cmanicd
[14002]     0 14002    11803       12      25      128             0 cmasm2d
[32615]     0 32615    36254      323      73        7             0 sshd
[  894] 12345   894    36254      328      70        5             0 sshd
[  895] 12345   895     3389      123      11        0             0 ksh
[10620]     0 10620    36254      328      72        0             0 sshd
[10634] 38714 10634    36290      329      70        8             0 sshd
[10635] 38714 10635    14221       25      31      124             0 sftp-server
[29021]     0 29021    36254      314      69        0             0 sshd
[29025] 12345 29025    36254      316      67        0             0 sshd
[29026] 12345 29026    29286       96      12        1             0 ksh
[29051] 12345 29051    29494      330      12       74             0 svr05
[29979] 12345 29979     1666       42       9        0             0 less
[29662]    89 29662    23316      258      43        0             0 pickup
[26065]    89 26065    23317      256      45        0             0 trivial-rewrite
[26066]    89 26066    23353      265      45        0             0 cleanup
[26067]    89 26067    23368      271      45        0             0 smtp
[26743]     0 26743    36254      314      68        0             0 sshd
[26937] 12345 26937    36254      314      67        0             0 sshd
[26938] 12345 26938    29286       96      11        0             0 ksh
[27122] 12345 27122    29494      459      12        0             0 svr05
[28657]     0 28657    36254      314      74        0             0 sshd
[28702] 12345 28702    36254      314      72        0             0 sshd
[28703] 12345 28703    29286       97      11        0             0 ksh
[28993]     0 28993    36254      314      72        0             0 sshd
[28996] 12345 28996    29526      531      12        0             0 svr05
[29006] 12345 29006    36254      314      69        0             0 sshd
[29007] 12345 29007    29286       96      11        0             0 ksh
[29110] 12345 29110    29558      745      12        0             0 svr05
[29481] 12345 29481    29214       58      14        0             0 sed
[29752] 12345 29752     7522      296      19        0             0 rotatelogs
Out of memory: Kill process 6576 (mysqld) score 651 or sacrifice child
Killed process 6576 (mysqld) total-vm:33914892kB, anon-rss:20629004kB, file-rss:0kB, shmem-rss:0kB
'''

    example_ubuntu2110 = u'''\
kworker/0:2 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=-1, oom_score_adj=0
CPU: 0 PID: 735 Comm: kworker/0:2 Not tainted 5.13.0-19-generic #19-Ubuntu
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ArchLinux 1.14.0-1 04/01/2014
Workqueue: events moom_callback
Call Trace:
 show_stack+0x52/0x58
 dump_stack+0x7d/0x9c
 dump_header+0x4f/0x1f9
 oom_kill_process.cold+0xb/0x10
 out_of_memory.part.0+0xce/0x270
 out_of_memory+0x41/0x80
 moom_callback+0x7a/0xb0
 process_one_work+0x220/0x3c0
 worker_thread+0x53/0x420
 kthread+0x11f/0x140
 ? process_one_work+0x3c0/0x3c0
 ? set_kthread_struct+0x50/0x50
 ret_from_fork+0x22/0x30
Mem-Info:
active_anon:221 inactive_anon:14331 isolated_anon:0
 active_file:18099 inactive_file:22324 isolated_file:0
 unevictable:4785 dirty:633 writeback:0
 slab_reclaimable:6027 slab_unreclaimable:6546
 mapped:15338 shmem:231 pagetables:412 bounce:0
 free:427891 free_pcp:153 free_cma:0
Node 0 active_anon:884kB inactive_anon:57324kB active_file:72396kB inactive_file:89296kB unevictable:19140kB isolated(anon):0kB isolated(file):0kB mapped:61352kB dirty:2532kB writeback:0kB shmem:924kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:1856kB pagetables:1648kB all_unreclaimable? no
Node 0 DMA free:15036kB min:352kB low:440kB high:528kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
lowmem_reserve[]: 0 1893 1893 1893 1893
Node 0 DMA32 free:1696528kB min:44700kB low:55872kB high:67044kB reserved_highatomic:0KB active_anon:884kB inactive_anon:57324kB active_file:72396kB inactive_file:89296kB unevictable:19140kB writepending:2532kB present:2080640kB managed:2010036kB mlocked:19140kB bounce:0kB free_pcp:612kB local_pcp:612kB free_cma:0kB
lowmem_reserve[]: 0 0 0 0 0
Node 0 DMA: 1*4kB (U) 1*8kB (U) 1*16kB (U) 1*32kB (U) 0*64kB 1*128kB (U) 0*256kB 1*512kB (U) 0*1024kB 1*2048kB (M) 3*4096kB (M) = 15036kB
Node 0 DMA32: 0*4kB 4*8kB (UM) 25*16kB (UME) 151*32kB (UM) 56*64kB (UM) 21*128kB (ME) 36*256kB (UME) 47*512kB (UM) 41*1024kB (UM) 32*2048kB (UM) 377*4096kB (UM) = 1696528kB
Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
42845 total pagecache pages
0 pages in swap cache
Swap cache stats: add 0, delete 0, find 0/0
Free swap  = 0kB
Total swap = 0kB
524158 pages RAM
0 pages HighMem/MovableOnly
17809 pages reserved
0 pages hwpoisoned
Tasks state (memory values in pages):
[  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
[    323]     0   323     9458     2766    77824        0          -250 systemd-journal
[    356]     0   356     5886     1346    69632        0         -1000 systemd-udevd
[    507]     0   507    70208     4646    98304        0         -1000 multipathd
[    542]   101   542    21915     1391    69632        0             0 systemd-timesyn
[    587]   102   587     4635     1882    73728        0             0 systemd-network
[    589]   103   589     5875     2951    86016        0             0 systemd-resolve
[    602]     0   602     1720      322    53248        0             0 cron
[    603]   104   603     2159     1168    53248        0          -900 dbus-daemon
[    608]     0   608     7543     4677    94208        0             0 networkd-dispat
[    609]   107   609    55313     1248    73728        0             0 rsyslogd
[    611]     0   611   311571     8248   221184        0          -900 snapd
[    613]     0   613     3404     1668    65536        0             0 systemd-logind
[    615]     0   615    98223     3142   126976        0             0 udisksd
[    620]     0   620     1443      278    45056        0             0 agetty
[    623]     0   623     1947     1147    57344        0             0 login
[    650]     0   650     3283     1683    65536        0         -1000 sshd
[    651]     0   651    27005     5232   106496        0             0 unattended-upgr
[    661]     0   661    58546     1812    90112        0             0 polkitd
[    856]  1000   856     3789     2157    73728        0             0 systemd
[    857]  1000   857    25433      835    86016        0             0 (sd-pam)
[    862]  1000   862     2208     1373    53248        0             0 bash
[    876]  1000   876     2870     1356    57344        0             0 sudo
[    877]     0   877     1899     1052    53248        0             0 bash
oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/unattended-upgrades.service,task=unattended-upgr,pid=651,uid=0
Out of memory: Killed process 651 (unattended-upgr) total-vm:108020kB, anon-rss:8380kB, file-rss:12548kB, shmem-rss:0kB, UID:0 pgtables:104kB oom_score_adj:0
'''

    sorted_column = None
    """Processes will sort by values in this column"""

    sort_order = None
    """Sort order for process values"""

    svg_namespace = 'http://www.w3.org/2000/svg'

    # generated with Colorgorical http://vrl.cs.brown.edu/color
    svg_colors_mem = [
        '#aee39a',
        '#344b46',
        '#1ceaf9',
        '#5d99aa',
        '#32e195',
        '#b02949',
        '#deae9e',
        '#805257',
        '#add51f',
        '#544793',
        '#a794d3',
        '#e057e1',
        '#769b5a',
        '#76f014',
        '#621da6',
        '#ffce54',
        '#d64405',
        '#bb8801',
        '#096013',
        '#ff0087'
    ]
    """20 different colors for memory usage diagram"""

    # generated with ColorBrewer (v2.0) https://colorbrewer2.org/?type=diverging&scheme=PuOr&n=3
    svg_colors_swap = [
        '#f1a340',
        '#f7f7f7',
        '#998ec3'
    ]
    """3 different colors for swap usage diagram"""

    svg_array_updown = """
<svg width="8" height="11">
  <use xlink:href="#svg_array_updown" />
</svg>
    """
    """SVG graphics with two black triangles UP and DOWN for sorting"""

    svg_array_up = """
<svg width="8" height="11">
    <use xlink:href="#svg_array_up" />
</svg>
    """
    """SVG graphics with one black triangle UP for sorting"""

    svg_array_down = """
<svg width="8" height="11">
    <use xlink:href="#svg_array_down" />
</svg>
    """
    """SVG graphics with one black triangle DOWN for sorting"""

    def __init__(self):
        self.oom = None
        self.set_HTML_defaults()
        self.update_toc()

        element = document.getElementById('version')
        element.textContent = "v{}".format(VERSION)

    def _set_item(self, item):
        """
        Paste the content into HTML elements with the ID / Class that matches the item name.

        The content won't be formatted. Only suffixes for pages and kbytes are added in the singular or plural.
        """
        elements = document.getElementsByClassName(item)
        for element in elements:
            content = self.oom_result.details.get(item, '')
            if isinstance(content, str):
                content = content.strip()

            if content == '<not found>':
                row = element.parentNode
                row.classList.add('js-text--display-none')

            if item.endswith('_pages') and isinstance(content, int):
                if content == 1:
                    content = "{} page".format(content)
                else:
                    content = "{} pages".format(content)

            if item.endswith('_kb') and isinstance(content, int):
                if content == 1:
                    content = "{} kByte".format(content)
                else:
                    content = "{} kBytes".format(content)

            if item.endswith('_percent') and isinstance(content, int):
                content = "{}%".format(content)

            element.textContent = content

        if DEBUG:
            show_element('notify_box')

    def update_toc(self):
        """
        Update the TOC to show current headlines only

        There are two conditions to show a h2 headline in TOC:
         * the headline is visible
         * the id attribute is set
        """
        new_toc = ''

        toc_content = document.querySelectorAll('nav > ul')[0]

        for element in document.querySelectorAll('h2'):
            if not (is_visible(element) and element.id):
                continue

            new_toc += '<li><a href="#{}">{}</a></li>'.format(element.id, element.textContent)

        toc_content.innerHTML = new_toc

    def update_process_table(self):
        """
        Re-create the process table with additional information
        """
        new_table = ''
        table_content = document.getElementById('process_table')

        for pid in self.oom_result.details['_ps_index']:
            if pid == self.oom_result.details['trigger_proc_pid']:
                css_class = 'class="js-pstable__triggerproc--bgcolor"'
            elif pid == self.oom_result.details['killed_proc_pid']:
                css_class = 'class="js-pstable__killedproc--bgcolor"'
            else:
                css_class = ''
            process = self.oom_result.details['_ps'][pid]
            line = """
            <tr {}>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
                <td>{}</td>
            </tr>
            """.format(css_class, pid, process['uid'], process['tgid'], process['total_vm_pages'], process['rss_pages'],
                       process['nr_ptes_pages'], process['swapents_pages'], process['oom_score_adj'], process['name'],
                       process['notes'])
            new_table += line

        table_content.innerHTML = new_table

        self.set_sort_triangle()

    def set_sort_triangle(self):
        """Set the sorting symbols for all columns in the process table"""
        # TODO Check operator overloading
        #      Operator overloading (Pragma opov) does not work in this context.
        #      self.oom_result.kconfig.ps_table_items + ['notes'] will compile to a string
        #      "pid,uid,tgid,total_vm_pages,rss_pages,nr_ptes_pages,swapents_pages,oom_score_adjNotes" and not to an
        #      array
        ps_table_and_notes = self.oom_result.kconfig.ps_table_items[:]
        ps_table_and_notes.append('notes')
        for column_name in ps_table_and_notes:
            element_id = "pstable_sort_{}".format(column_name)
            element = document.getElementById(element_id)
            if not element:
                internal_error('Missing id "{}" in process table.'.format(element_id))
                continue

            if column_name == self.sorted_column:
                if self.sort_order == 'descending':
                    element.innerHTML = self.svg_array_down
                else:
                    element.innerHTML = self.svg_array_up
            else:
                element.innerHTML = self.svg_array_updown

    def set_HTML_defaults(self):
        """Reset the HTML document but don't clean elements"""
        # hide all elements marked to be hidden by default
        hide_elements('.js-text--default-hide')

        # show all elements marked to be shown by default
        show_elements('.js-text--default-show')

        # show hidden rows
        show_elements('table .js-text--display-none')

        # clear notification box
        element = document.getElementById('notify_box')
        while element.firstChild:
            element.removeChild(element.firstChild)

        # clear process table
        element = document.getElementById('process_table')
        while element.firstChild:
            element.removeChild(element.firstChild)

        # reset sort triangles
        self.sorted_column = None
        self.sort_order = None
        self.set_sort_triangle()

        # remove svg charts
        for element_id in ('svg_swap', 'svg_ram'):
            element = document.getElementById(element_id)
            while element.firstChild:
                element.removeChild(element.firstChild)

    def svg_create_element(self, height, width, css_class):
        """Return an empty SVG element"""
        svg = document.createElementNS(self.svg_namespace, 'svg')
        svg.setAttribute('version', '1.1')
        svg.setAttribute('height', height)
        svg.setAttribute('width', width)
        svg.setAttribute('viewBox', '0 0 {} {}'.format(width, height))
        svg.setAttribute('class', css_class)
        return svg

    def svg_create_rect(self, x=0, y=0, width=0, height=0, color=None, title=None):
        g = document.createElementNS(self.svg_namespace, 'g')
        rect = document.createElementNS(self.svg_namespace, 'rect')
        if x:
            rect.setAttribute('x', x)
        if y:
            rect.setAttribute('y', y)
        if width:
            rect.setAttribute('width', width)
        if height:
            rect.setAttribute('height', height)
        if color:
            rect.setAttribute('fill', color)
        if title:
            t = document.createElementNS(self.svg_namespace, 'title')
            t.textContent = title
            g.appendChild(t)
        g.appendChild(rect)
        return g

    def svg_generate_bar_chart(self, color_list, *elements):
        """Generate a SVG bar chart"""
        bar_height = 100
        label_height = 80
        length_factor = 4
        overall_height = bar_height + label_height
        overall_width = 100 * length_factor
        css_class = 'js-mem-usage__svg'

        svg = self.svg_create_element(overall_height, overall_width, css_class)

        sum_all_elements = sum([length for unused, length in elements])

        current_pos = 0
        bar_group = document.createElementNS(self.svg_namespace, 'g')
        bar_group.setAttribute('id', 'bar_group')
        bar_group.setAttribute('stroke', 'black')
        bar_group.setAttribute('stroke-width', 2)

        nr_processed_elements = 0
        for title, length in elements:
            # length is None/undefined is the regular expression doesn't find any values
            if not length:
                continue

            rect_len = int(100 * length / sum_all_elements) * length_factor

            if not rect_len:
                continue

            color = color_list[nr_processed_elements % len(color_list)]

            rect = self.svg_create_rect(current_pos, 0, rect_len, bar_height, color, title)
            bar_group.appendChild(rect)

            label_group = document.createElementNS(self.svg_namespace, 'g')
            label_group.setAttribute('id', title)
            color_rect = self.svg_create_rect(0, 0, 20, 20, color)
            color_rect.setAttribute('stroke', 'black')
            color_rect.setAttribute('stroke-width', 2)

            text = document.createElementNS(self.svg_namespace, 'text')
            text.setAttribute('x', '30')
            text.setAttribute('y', '18')
            text.textContent = title

            label_group.appendChild(color_rect)
            label_group.appendChild(text)

            # TODO replace hardcoded values
            x = 5 + 125 * (nr_processed_elements // 2)
            y = bar_height + 10 + (nr_processed_elements % 2) * 40
            label_group.setAttribute('transform', 'translate({}, {})'.format(x, y))

            bar_group.appendChild(label_group)

            current_pos += rect_len
            nr_processed_elements += 1

        svg.appendChild(bar_group)

        return svg

    def copy_example_rhel7_to_form(self):
        document.getElementById('textarea_oom').value = self.example_rhel7

    def copy_example_ubuntu_to_form(self):
        document.getElementById('textarea_oom').value = self.example_ubuntu2110

    def reset_form(self):
        document.getElementById('textarea_oom').value = ""
        self.set_HTML_defaults()
        self.update_toc()

    def toggle_oom(self, show=False):
        """Toggle the visibility of the full OOM message"""
        oom_element = document.getElementById('oom')
        row_with_oom = oom_element.parentNode.parentNode
        toggle_msg = document.getElementById('oom_toogle_msg')

        if show or row_with_oom.classList.contains('js-text--display-none'):
            row_with_oom.classList.remove('js-text--display-none')
            toggle_msg.text = "(click to hide)"
        else:
            row_with_oom.classList.add('js-text--display-none')
            toggle_msg.text = "(click to show)"

    def analyse_and_show(self):
        """Analyse the OOM text inserted into the form and show the results"""
        self.oom = OOMEntity(self.load_from_form())

        # set defaults and clear notifications
        self.set_HTML_defaults()

        analyser = OOMAnalyser(self.oom)
        success = analyser.analyse()
        if success:
            self.oom_result = analyser.oom_result
            self.show_oom_details()
            self.update_toc()
        else:
            # don't show results - just return
            return

    def load_from_form(self):
        """
        Return the OOM text from textarea element
        
        @rtype: str 
        """
        element = document.getElementById('textarea_oom')
        oom_text = element.value
        return oom_text

    def show_oom_details(self):
        """
        Show all extracted details as well as additionally generated information
        """
        hide_element('input')
        show_element('analysis')
        if self.oom_result.oom_type == OOMEntityType.manual:
            hide_elements('.js-oom-automatic--show')
            show_elements('.js-oom-manual--show')
        else:
            show_elements('.js-oom-automatic--show')
            hide_elements('.js-oom-manual--show')

        for item in self.oom_result.details.keys():
            # ignore internal items
            if item.startswith('_'):
                continue
            self._set_item(item)

        # Hide "OOM Score" if not available
        # since KernelConfig_5_0.EXTRACT_PATTERN_OVERLAY_50['Process killed by OOM']
        if 'killed_proc_score' in self.oom_result.details:
            show_elements('.js-killed-proc-score--show')
        else:
            hide_elements('.js-killed-proc-score--show')

        # generate process table
        self.update_process_table()

        # show/hide swap space
        if self.oom_result.swap_active:
            # generate swap usage diagram
            svg_swap = self.svg_generate_bar_chart(
                self.svg_colors_swap,
                ('Swap Used', self.oom_result.details['swap_used_kb']),
                ('Swap Free', self.oom_result.details['swap_free_kb']),
                ('Swap Cached', self.oom_result.details['swap_cache_kb']),
            )
            elem_svg_swap = document.getElementById('svg_swap')
            elem_svg_swap.appendChild(svg_swap)
            show_elements('.js-swap-active--show')
            hide_elements('.js-swap-inactive--show')
        else:
            hide_elements('.js-swap-active--show')
            show_elements('.js-swap-inactive--show')

        # generate RAM usage diagram
        ram_title_attr = (
            ('Active mem',         'active_anon_pages'),
            ('Inactive mem',       'inactive_anon_pages'),
            ('Isolated mem',       'isolated_anon_pages'),
            ('Active PC',          'active_file_pages'),
            ('Inactive PC',        'inactive_file_pages'),
            ('Isolated PC',        'isolated_file_pages'),
            ('Unevictable',        'unevictable_pages'),
            ('Dirty',              'dirty_pages'),
            ('Writeback',          'writeback_pages'),
            ('Unstable',           'unstable_pages'),
            ('Slab reclaimable',   'slab_reclaimable_pages'),
            ('Slab unreclaimable', 'slab_unreclaimable_pages'),
            ('Mapped',             'mapped_pages'),
            ('Shared',             'shmem_pages'),
            ('Pagetable',          'pagetables_pages'),
            ('Bounce',             'bounce_pages'),
            ('Free',               'free_pages'),
            ('Free PCP',           'free_pcp_pages'),
            ('Free CMA',           'free_cma_pages'),
        )
        chart_elements = [(title, self.oom_result.details[value]) for title, value in ram_title_attr
                          if value in self.oom_result.details]
        svg_ram = self.svg_generate_bar_chart(self.svg_colors_mem, *chart_elements)
        elem_svg_ram = document.getElementById('svg_ram')
        elem_svg_ram.appendChild(svg_ram)

        element = document.getElementById('oom')
        element.textContent = self.oom_result.oom_text
        self.toggle_oom(show=False)

    def sort_pstable(self, column_name):
        """Sort process table by the values in the given column"""
        # TODO Check operator overloading
        #      Operator overloading (Pragma opov) does not work in this context.
        #      self.oom_result.kconfig.ps_table_items + ['notes'] will compile to a string
        #      "pid,uid,tgid,total_vm_pages,rss_pages,nr_ptes_pages,swapents_pages,oom_score_adjNotes" and not to an
        #      array
        ps_table_and_notes = self.oom_result.kconfig.ps_table_items[:]
        ps_table_and_notes.append('notes')
        if column_name not in ps_table_and_notes:
            internal_error('Can not sort process table with an unknown column name "{}"'.format(column_name))
            return

        # reset sort order if the column has changes
        if column_name != self.sorted_column:
            self.sort_order = None
        self.sorted_column = column_name

        if not self.sort_order or self.sort_order == 'descending':
            self.sort_order = 'ascending'
            self.sort_psindex_by_column(column_name)
        else:
            self.sort_order = 'descending'
            self.sort_psindex_by_column(column_name, True)

        self.sorted_column = column_name

        self.update_process_table()

    def sort_psindex_by_column(self, column_name, reverse=False):
        """
        Sort the pid list '_ps_index' based on the values in the process dict '_ps'.

        Is uses bubble sort with all disadvantages but just a few lines of code
        """

        ps = self.oom_result.details['_ps']
        ps_index = self.oom_result.details['_ps_index']

        def getvalue(column, pos):
            if column == 'pid':
                value = ps_index[pos]
            else:
                value = ps[ps_index[pos]][column]
            # JS sorts alphanumeric by default, convert values explicit to integers to sort numerically
            if column not in ['name', 'notes'] and value is not js_undefined:
                value = int(value)
            return value

        # We set swapped to True so the loop looks runs at least once
        swapped = True
        while swapped:
            swapped = False
            for i in range(len(ps_index) - 1):

                v1 = getvalue(column_name, i)
                v2 = getvalue(column_name, i+1)

                if (not reverse and v1 > v2) or (reverse and v1 < v2):
                    # Swap the elements
                    ps_index[i], ps_index[i+1] = ps_index[i+1], ps_index[i]

                    # Set the flag to True so we'll loop again
                    swapped = True


OOMDisplayInstance = OOMDisplay()