[Collectl-interest] Clarification on counters

Hello.

I was emptying out a swap volume (swapoff) and looking at the output of
collectl  -sm  --verbose -oT , while trying to make sense of a system with
a continuously rising swap occupation despite vm.swappiness set to 0.

Since the total swap memory was progressively shrinking down from a few
hundreds MB, I can't quite understand the values of swapped-in memory in
the GB range ( e.g. 6220M, 8536M ).
Is it a collectl bug or just a misunderstanding of mine?

# uname -a
Linux mail 4.4.0-79-generic #100-Ubuntu SMP Wed May 17 19:58:14 UTC 2017
x86_64 x86_64 x86_64 GNU/Linux


# MEMORY SUMMARY
#         <------------------------------------Physical
Memory------------------------------------------><-----------Swap------------><-------Paging------>

#            Total    Used    Free    Buff  Cached    Slab  Mapped    Anon
  AnonH  Commit  Locked Inact Total  Used  Free   In  Out Fault MajFt   In
 Out
10:24:46    28143M  27931M 216776K   1504M   5453M   1089M 348180K  19686M
 17818M  21190M   3656K 3186M  247M  247M     0 6220M    0    15     0 6240
 164
10:24:47    28143M  27936M 211496K   1504M   5454M   1089M 348180K  19691M
 17818M  21190M   3656K 3186M  240M  240M     0 6472M    0     1     0 6472
1860
10:24:48    28143M  27945M 203004K   1504M   5455M   1089M 348180K  19698M
 17818M  21190M   3656K 3186M  232M  232M     0 8484M    0    44     0 9020
 664
10:24:49    28143M  27927M 220972K   1500M   5437M   1089M 347972K  19702M
 17818M  21190M   3656K 3180M  227M  227M     0 4768M    0   113     0 4772
2876
10:24:50    28143M  27934M 214276K   1500M   5438M   1089M 347972K  19708M
 17818M  21190M   3656K 3179M  221M  221M     0 6752M    0    67     0 7464
1468
10:24:51    28143M  27943M 204968K   1500M   5439M   1089M 347976K  19715M
 17818M  21190M   3656K 3179M  212M  212M     0 8536M    0   278     0 9184
 364
10:24:52    28143M  27927M 220716K   1498M   5419M   1089M 347908K  19721M
 17816M  21190M   3656K 3173M  205M  205M     0 7428M    0   388     0 7724
1444
10:24:53    28143M  27934M 213628K   1498M   5421M   1089M 347908K  19728M
 17816M  21190M   3656K 3173M  197M  197M     0 7812M    0    95     0 7864
 320
10:24:54    28143M  27941M 206700K   1499M   5423M   1089M 347908K  19732M
 17816M  21190M   3656K 3173M  192M  192M     0 5576M    0    77     0 6080
 388
10:24:55    28143M  27925M 223432K   1496M   5404M   1089M 347940K  19736M
 17816M  21190M   3656K 3166M  186M  186M     0 5876M    0    53     7 5960
 268
10:24:56    28143M  27933M 215256K   1497M   5407M   1089M 347824K  19739M
 17816M  21190M   3656K 3167M  181M  181M     0 5720M    0  3721     0 6444
5568
10:24:57    28143M  27938M 209808K   1497M   5409M   1089M 347828K  19743M
 17816M  21190M   3656K 3167M  176M  176M     0 4756M    0    67     0 4904
1312
10:24:58    28143M  27922M 225808K   1495M   5390M   1089M 347868K  19748M
 17816M  21190M   3656K 3162M  171M  171M     0 4588M    0   559     1 5540
3680
10:24:59    28143M  27928M 220016K   1495M   5391M   1089M 347712K  19753M
 17816M  21190M   3656K 3162M  166M  166M     0 5696M    0    45     0 5700
3056
10:25:00    28143M  27934M 213708K   1495M   5392M   1089M 347712K  19757M
 17816M  21190M   3656K 3162M  161M  161M     0 4537M    0    77    12 4661
 740
10:25:01    28143M  27939M 208256K   1495M   5393M   1089M 347768K  19761M
 17816M  21155M   3656K 3162M  157M  157M     0 4000M    0  2374     2 4253
1122
10:25:02    28143M  27943M 204628K   1496M   5395M   1089M 347828K  19764M
 17816M  21155M   3656K 3162M  153M  153M     0 4768M    0   724     8 5052
4244
10:25:03    28143M  27929M 218600K   1493M   5377M   1089M 347800K  19769M
 17816M  21155M   3656K 3156M  146M  146M     0 6524M    0    90     4 6544
2748
10:25:04    28143M  27930M 217436K   1494M   5376M   1089M 347848K  19772M
 17816M  21155M   3656K 3155M  142M  142M     0 4012M    0   103     0 4456
8308
10:25:05    28143M  27935M 212584K   1494M   5377M   1089M 347848K  19777M
 17816M  21155M   3656K 3155M  138M  138M     0 4964M    0    64     0 4968
 928
10:25:06    28143M  27940M 207656K   1494M   5379M   1089M 347872K  19780M
 17816M  21155M   3656K 3155M  133M  133M     0 4900M    0    31     0 4928
 316
10:25:07    28143M  27923M 224816K   1488M   5363M   1089M 347872K  19785M
 17816M  21155M   3656K 3149M  125M  125M     0 5828M    0   147    10 5872
 392



Thanks in advance and also thanks a lot for collectl as a tool.


Regards,
Fulvio Scapin