[LTP] [RFC PATCH] tst_cgroup: Avoid mixing mounts V1 and V2 simultaneously

[Cyril Hrubis]

Hi!
> There is a tiny problem with the test logic of this tst_cgroup library,
> that it potentially mixes Cgroup V1 and V2 together to be mounted at
> the same time. The scenario happens once people just requests CTRL_BASE
> (or a V2 controller not enabled) on a only V1-mounted system.
>
> Cgroup community always objected to enabling Cgroup like that (V1&V2),
> which may bring unexpected issues along the way.
> 
> So this patch cancels LTP mount V1&V2 simultaneously even if there is
> no overlap in specific controller files.

Isn't this the point of the library, to be able to use mixed V1 and V2
setup? As far as I understand it the only limitation is that we can bind
a controllter to either V1 or V2 but not both.

Also as far as I can tell, there is pleny of distributions out there at
the moment where the default is split between V1 and V2 both mounted at
the same time.

-- 
Cyril Hrubis
chrubis@suse.cz