[Intel-gfx] [PATCH RFC 6/9] drm: Add cgroup helper library

[Tejun Heo]

Hello, Matt.

On Fri, Jan 19, 2018 at 05:51:38PM -0800, Matt Roper wrote:
> Most DRM drivers will want to handle the CGROUP_SETPARAM ioctl by looking up a
> driver-specific per-cgroup data structure (or allocating a new one) and storing
> the supplied parameter value into the data structure (possibly after doing some
> checking and sanitization on the provided value).  Let's provide a helper
> library for drivers that will take care of the details of storing per-cgroup
> data structures in a hashtable and destroying those structures if/when the
> cgroup itself is removed.

Would it be possible to make the core of this a built-in part of
cgroup like cgroup-bpf does?  My gut feeling is that that isn't gonna
be much code anyway and likely to be cleaner to implement and use.

Being a full-fledged controller comes with quite a bit of complexity
in terms of sync rules and everything, and we may build a simpler
modular infrastructure if usages like this proliferate but for now
extending from the core seems the most straight forward.

Thanks.

-- 
tejun