[RFD] cgroup: about multiple hierarchies
Li Zefan
lizf at cn.fujitsu.com
Thu Feb 23 07:59:44 UTC 2012
> Trying to make all the controllers uniform in terms of their treatment
> of cgroup hiearchy sounds like a good thing to do.
Agreed.
Apart from nesting cgroups, there're other inconsistencies.
- Some controllers disallow more than one cgroup layer. That's the new
net_prio controller, and I don't know why it's made so, but I guess
it's fine to eliminate this restriction.
- Some controllers move resource charges when a task is moved to
a different cgroup, but some don't?
- Some controllers disallow task attaching under some circumstances.
So if we have a single hierarchy with all subsystems, the chance
that attaching a task to a cgroup fails may be bigger.
> Once that is done,
> one can probably see if it is worth to put all the controllers in a
> single hierarchy.
>
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