[PATCH 3/6] cgroup: introduce cgroup_taskset and use it in subsys->can_attach(), cancel_attach() and attach()

Paul Menage paul at paulmenage.org
Thu Aug 25 02:14:12 PDT 2011

On Tue, Aug 23, 2011 at 3:19 PM, Tejun Heo <tj at kernel.org> wrote:
> Currently, there's no way to pass multiple tasks to cgroup_subsys
> methods necessitating the need for separate per-process and per-task
> methods.  This patch introduces cgroup_taskset which can be used to
> pass multiple tasks and their associated cgroups to cgroup_subsys
> methods.
> Three methods - can_attach(), cancel_attach() and attach() - are
> converted to use cgroup_taskset.  This unifies passed parameters so
> that all methods have access to all information.  Conversions in this
> patchset are identical and don't introduce any behavior change.
> Signed-off-by: Tejun Heo <tj at kernel.org>

The general idea of passing consistent information to all *attach
methods seems good, but isn't it simpler to just fix up the various
method signatures?

The whole point of having *attach() and *attach_task() was to minimize
the amount of boilerplate (in this case, iterating across a new
cgroup_taskset abstraction) in the subsystems, leaving that to the
cgroups framework.


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