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

From: Tejun Heo
Date: Fri Oct 19 2012 - 16:02:31 EST

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.


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