Messages in this thread | | | Date | Fri, 14 Sep 2012 13:39:25 -0700 | From | Tejun Heo <> | Subject | Re: [RFC] cgroup TODOs |
| |
Hello, again.
On Fri, Sep 14, 2012 at 12:49:50PM -0700, Tejun Heo wrote: > That said, if someone can think of a better solution, I'm all ears. > One thing that *has* to be maintained is that it should be able to tag > a resource in such way that its associated controllers are > identifiable regardless of which task is looking at it.
So, I thought about it more. How about we do "consider / ignore this node" instead of "(don't) nest beyond this level". For example, let's assume a tree like the following.
R / | \ A B C / \ AA AB
If we want to differentiate between AA and AB, we'll have to consider the whole tree with the previous sheme - A needs to nest, so R needs to nest and we end up with the whole tree. Instead, if we have honor / ignore this node. We can set the honor bit on A, AA and AB and see the tree as
R / A / \ AA AB
We still see the intermediate A node but can ignore the other branches. Implementation and concept-wise, it's fairly simple too. For any given node and controller, you travel upwards until you meet a node which has the controller enabled and that's the cgroup the controller considers.
Thanks.
-- tejun
| |