[Devel] Re: [RFC/PATCH] cgroup swap subsystem

[Pavel Emelyanov]

Paul Menage wrote:
> On Thu, Mar 6, 2008 at 12:38 AM, Pavel Emelyanov <xemul at openvz.org> wrote:
>>  > Hierarchical res_counter makes sense.
>>  > Making it in simple/reasonable style will be our challenge.
>>
>>  I have this in my TODO list. Since this is not so urgent, then if you
>>  don't mind I can prepare the patches next week - after I set the git
>>  tree up. This change doesn't seem that big.
>>
> 
> The change that you're referring to is allowing a cgroup to have a
> total memory limit for itself and all its children, and then giving
> that cgroup's children separate memory limits within that overall
> limit?

Yup. Isn't this reasonable? 

Without this, if I'm a task in a 1GB limited cgroup, I can create a new 
one, set 2GB limit and spawn a kid into it (or move there myself) and be 
happy with 2GB of memory... With the proposed change, even if I set a 2GB
for a subgroup it will not pass _my_ (1GB) limit.

> Paul
>