Re: About cgroup memory limits

[Michel Machado <michel-K36Kqf6HJK439yzSjRtAkw@public.gmane.org>]

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:

> > 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