[PATCH][DOCUMENTATION] Minimal controller code for a quick start

[Peter Zijlstra]

On Thu, 2008-02-07 at 18:37 +0300, Pavel Emelyanov wrote:
> The Documentation/cgroups.txt file contains the info on how
> to write some controller for cgroups subsystem, but even with
> this, one need to write quite a lot of code before developing
> the core (or copy-n-paste it from some other place).
> 
> I propose to put this minimal controller into Documentation
> directory to let people copy-n-paste a) from a known place and 
> b) a small piece of code.
> 
> Besides, many people learn better reading an example rather
> than/along with a document.


While on the subject, could someone document struct cgroup_subsys. In
particular, I've wondered why we have: cgroup_subsys::can_attach() and
not use a return value in cgroup_subsys::attach()?