[CRIU] [PATCH 1/2] cg: Add ability to dump custom cgroup properties and skip controllers

[Tycho Andersen]

Hi Cyrill,

On Wed, Apr 27, 2016 at 11:53:09AM +0300, Cyrill Gorcunov wrote:
> +
> +	if (!list_empty(&cgp_list)) {
> +		pr_info("Custom controllers defined. Zapping compiled in ones.\n");
> +		INIT_LIST_HEAD(&cgp_predefined_list);
> +	}

This means that (IIUC) we can't inherit some properties from the built
in set. The way I envision using this feature is for when new
controllers or properties are released in the kernel but not in
upstream CRIU yet (because I haven't updated the list ;-), so I'd
probably want all the built in ones plus some additional ones.

Is there some way we can either add a mode to merge the props provided
into the props hardcoded? We could just merge by controller, so if you
specify some props for a controller, you have to specify all the ones
for that controller, but if you don't say anything about a controller,
you get the defaults (or you can exclude it with
--cgroup-exclude-controller when that patch lands).

Tycho