On Fri, Jun 5, 2009 at 2:36 AM, Balbir Singh<bal...@linux.vnet.ibm.com> wrote: > > The important scenario I have is adding and removing groups. > > Consider 10 cgroups with shares of 10 each, what if 5 new are created > with the same shares? We now start getting 100/15, even though we did > not change our shares.
Are you assuming that arbitrary users can create new cgroups whenever they like, with whatever shares they like? In that situation, how would you use hard limits to provide guarantees? Presumably if the user could create a cgroup with an arbitrary share, they could create one with an arbitrary hard limit too. Can you explain a bit more about how you're envisaging cgroups being created, and how their shares and hard limits would get set? I was working on the assumption that (for any sub-tree of the CFS hierarchy) there's a single managing entity that gets to decide the shares given to the cgroups within that tree. That managing entity would be responsible for ensuring that the shares given out allowed guarantees to be met (or alternatively, that the probability of violating those guarantees based on the shares given out was within some tolerance threshold). Paul -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
