Re: [PATCHSET cgroup/for-3.8] cgroup_freezer: allow migration regardless of freezer state and update locking

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