[PATCHSET cgroup/for-3.8] cgroup_freezer: allow migration regardless of freezer state and update locking
Tejun Heo
tj at kernel.org
Fri Oct 19 20:02:35 UTC 2012
Hey, Matt.
On Thu, Oct 18, 2012 at 06:29:45PM -0700, Matt Helsley wrote:
> Yeah, that would be a nice cleanup too. I guess the ultra-careful way to
> remove this feature would be something like:
>
> Add an internal migration restriction (which may or may not be
> exported as a userspace interface in a subsequent
> patch).
>
> Make the cgroup freezer use it.
>
> Make the cgroup freezer WARN_ONCE() when the subsystem is first
> mounted. Indicates that the behavior is going to
> change.
>
> ... time passes ...
>
> Remove the use of the migration "lock" from the cgroup freezer
> and the WARN_ONCE().
>
> Which would also make the feature more obvious.
I don't think I'm gonna go that far for this. I don't think we need
cgroup migration locking after all.
Thanks.
--
tejun
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