Re: [PATCHv12 0/3] rdmacg: IB/core: rdma controller support

[Parav Pandit <pandit.parav-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi Tejun,

Sorry for the late response. I was traveling during weekend.

On Fri, Oct 14, 2016 at 4:44 AM, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> Hello, Parav.
>
> On Mon, Oct 10, 2016 at 07:02:11PM +0530, Parav Pandit wrote:
>> Give me some more time, I will think more and take feeback from Leon
>> and others on
>> (a) how can we implement or want to implement weight like
>> functionality for non-work-conversing resource
>
> I think what you want is just a way to specify absolute limits using
> percentages of what's available at the time of configuration -
> e.g. being able to say "allow upto 30% of what's available in the
> parent".

Yes. I am concerned about how to configure < 1% value to avoid
floating point math in kernel as thats discouraged.
Configuring in range of 1 to 100% for a given resource limits to only
100 or less cgroup instances which I think is not desired.

> If so, the simplest way would be simply updating the
> existing knobs to accept % inputs in addition to absolute values on
> writes.

I was not sure to overload rdma.max file for accepting % inputs as
thats not done in other cgroups. So I was thinking more of weights
interface which avoids floating point problem and also allows much
wider configuration range.

>
> Thanks.
>
> --
> tejun