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SubjectRe: [PATCH 5/7] cgroups: Make freezer subsystem bindable
On Fri, Oct 22, 2010 at 01:57:55PM -0700, Matt Helsley wrote:
> On Fri, Oct 22, 2010 at 04:11:41PM +0800, Li Zefan wrote:
> > To make it bindable, we need to thaw all processes when unbinding
> > the freezer subsystem from a cgroup hierarchy.
> >
> > Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

<snip>

>
> Alternately you could split the bind/unbind op function pointers
> and get rid of the boolean argument. Then just don't fill in the
> freezer's unbind op and refuse to unbind subsystems that lack
> the unbind op. That seems a bit cleaner for now at least.

Or alternately to the alternate :): add a can_unbind:1 field and keep
the boolean bind op argument. That might be best -- avoids an extra
function pointer and still splits the bind/unbind-ability of a
subsystem.

Cheers,
-Matt Helsley


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