[Devel] Re: [PATCH v2 04/11] kmem accounting basic infrastructure

[Michal Hocko]

On Wed 15-08-12 16:53:40, Glauber Costa wrote:
[...]
> >>> This doesn't check for the hierachy so kmem_accounted might not be in 
> >>> sync with it's parents. mem_cgroup_create (below) needs to copy
> >>> kmem_accounted down from the parent and the above needs to check if this
> >>> is a similar dance like mem_cgroup_oom_control_write.
> >>>
> >>
> >> I don't see why we have to.
> >>
> >> I believe in a A/B/C hierarchy, C should be perfectly able to set a
> >> different limit than its parents. Note that this is not a boolean.
> > 
> > Ohh, I wasn't clear enough. I am not against setting the _limit_ I just
> > meant that the kmem_accounted should be consistent within the hierarchy.
> > 
> 
> If a parent of yours is accounted, you get accounted as well. This is
> not the state in this patch, but gets added later. Isn't this enough ?

But if the parent is not accounted, you can set the children to be
accounted, right? Or maybe this is changed later in the series? I didn't
get to the end yet.
-- 
Michal Hocko
SUSE Labs