Messages in this thread | | | Date | Wed, 31 Oct 2012 09:41:23 -0700 | From | Tejun Heo <> | Subject | Re: [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs |
| |
Hey, Michal.
On Wed, Oct 31, 2012 at 03:37:51PM +0100, Michal Hocko wrote: > > + for_each_subsys(cgrp->root, ss) > > + if (ss->pre_destroy) > > + WARN_ON_ONCE(ss->pre_destroy(cgrp)); > > Hmm, I am not sure I like this WARN_ON_ONCE. First it can happen for > more than one controller and second we can just clear CGRP_WAIT_ON_RMDIR > and return with EBUSY. The only possible failure at the moment is when a > new task or a child group appear. > I know it is not a big deal because it will disappear later in the > series but it would be more readable IMO.
The WARN_ON_ONCE() is just moved from the original cgroup_call_pre_destroy(). We can add an error out there but that makes future changes difficult. It's a chicken and egg problem. You gotta break the loop somewhere.
Thanks.
-- tejun
| |