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

[Glauber Costa]

On 08/15/2012 05:02 PM, Michal Hocko wrote:
> 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.
> 

Yes, you can. Do you see any problem with that?