[PATCH cgroup/for-3.11 1/3] cgroup: mark "tasks" cgroup file as insane

[Tejun Heo]

Some resources controlled by cgroup aren't per-task and cgroup core
allowing threads of a single thread_group to be in different cgroups
forced memcg do explicitly find the group leader and use it.  This is
gonna be nasty when transitioning to unified hierarchy and in general
we don't want and won't support granularity finer than processes.

Mark "tasks" with CFTYPE_INSANE.

Signed-off-by: Tejun Heo <tj at kernel.org>
Cc: Johannes Weiner <hannes at cmpxchg.org>
Cc: Michal Hocko <mhocko at suse.cz>
Cc: Balbir Singh <bsingharora at gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>
Cc: cgroups at vger.kernel.org
Cc: Vivek Goyal <vgoyal at redhat.com>
---
 kernel/cgroup.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4037,6 +4037,7 @@ static int cgroup_clone_children_write(s
 static struct cftype files[] = {
 	{
 		.name = "tasks",
+		.flags = CFTYPE_INSANE,		/* use "procs" instead */
 		.open = cgroup_tasks_open,
 		.write_u64 = cgroup_tasks_write,
 		.release = cgroup_pidlist_release,