Re: [PATCH v4 cgroup/for-3.7] cgroup: mark subsystems with broken hierarchy support and whine if cgroups are nested for them

On 09/14/2012 12:03 AM, Tejun Heo wrote:

Hello, Vivek.

On Thu, Sep 13, 2012 at 03:41:11PM -0400, Vivek Goyal wrote:

quoted

I think for blkio controller, first level of creation itself is wrong if
hierarchy is not supported. 

				root
			       / | \ 
                              T1 T2 G1

I side with Vivek, and I think we should warn first level. It just tends
to be wrong. If memcg is a special case, just special case it.
_but_, I see no reason not to do it.

While I agree with Michal point that this is not necessary, I don't
think being noisier than we need to be is a crime. Less noisy certainly
can be.