Hello, Parav. On Mon, Oct 10, 2016 at 11:59:45AM +0530, Parav Pandit wrote: > >> Weight can be in range of 1 to 10,000 similar to cpu cgroup. > > > > This is exactly what I don't like, the percentage will remove from the > > user the translation needs between weight and actual limitation. > > > > IMHO CPU used weights because everything there is in weights :). > > I admit weight are not very intuitive, I was aligning to the existing > other cgroup interfaces which achieves similar functionality. > I will let Tejun approve the "percentage" or "ratio" new file > interface as its little different than weight. So, if there is gonna be a proportional control mechanism, it should use the same interface convention as other proportional controls. Also, I don't get what you mean by using percentage and when people brought up this idea, it always has been stemming from misunderstanding. Can you please elaborate how percentage based proportional control would work? What would 100% mean when cgroups can come and go? If you're suggesting expressing absolute limits in terms of percentage, that is not proportional control. That's just using a different unit for absolute resource limits and it must not be called weight. > weight or percentage helps in abstracting as starting point. So I like > to add it too. Way back, when rdmacg was proposed first, I asked the same question - whether there can be a higher level abstraction for rdma resources, and, IIRC, the collective answer was that the there can be no universal measure of resources in the kernel because a large part of resource management actually takes place in userspace. If I misunderstood, please correct me but what's being suggested here seems to be implementing the knob in rdamcg and letting the specific drivers worry about the actual resource provisioning and even then there doesn't seem to be a clear way of semantically defining what ratios would mean. Let's please first establish what the resource control would exactly mean. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
