Re: About cgroup memory limits

Hi Johannes,

   Thank you very much for your reply, it does help us to understand the
numbers we have at hand.

   Could you clarify your following statement further:

quoted

Below is the sum of each field in /proc/$PID/statm for every process
running inside a test container, converted to bytes:

       size  resident     share     text  lib       data  dt
  897208320  28741632  20500480  1171456    0  170676224   0

statms accounts based on virtual memory, not physical memory like
memcg does.  If you have the same page mapped into two tasks, both
their "share" counters will show a page, while the memcg will only
account the single physical page in mapped_file.

   You mean when those two tasks are in the same cgroup, don't you? Is
there a case in which a page is shared by two tasks that are in
different cgroups but that page is accounted only for one of the two
cgroups? If so, how's this case triggered?

-- 
[ ]'s
Michel Machado