[Devel] Re: Loadable cgroup subsystems

[Nikanth Karthikesan]

On Mon, 2008-04-07 at 22:43 -0700, Paul Menage wrote:
> On Mon, Apr 7, 2008 at 10:39 PM, Nikanth Karthikesan <knikanth at suse.de> wrote:
> >
> >  Why not provide a interface to add subsystems at run-time instead?
> >  Are there any reason for not letting a subsystem to be implemented as a
> >  loadable module? IOW make cgroups usable by modules?
> >
> 
> Having all the subsystems declared at compile time makes a lot of
> things (number of subsystems, size of css_set, etc) statically known,
> which makes the code clearer and more importantly eliminates a bunch
> of locking/synchronization overhead.
> 

true

> It would be possible to make cgroups support dynamically-loaded
> subsystems, and in fact, some of the earliest cgroups patches did
> support this, for a predefined max number of subsystems. But it would
> introduce more complexity and overhead.
> 
> I'd rather not add support for this without a strong case of a
> subsystem that really needs to be dynamically loaded.

There were some band-width control patches based on cfq + cgroups, which
I guess will mandate cfq to be built-in?

Thanks
Nikanth Karthikesan

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