Task Control Groups: add tasks file interface

Add the per-directory "tasks" file for cgroupfs mounts; this allows the
user to determine which tasks are members of a cgroup by reading a
cgroup's "tasks", and to move a task into a cgroup by writing its pid to
its "tasks".

Signed-off-by: Paul Menage <menage@google.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/cgroup.h

@@ -144,6 +144,16 @@ int cgroup_is_removed(const struct cgroup *cont);
 
 int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
 
+int __cgroup_task_count(const struct cgroup *cont);
+static inline int cgroup_task_count(const struct cgroup *cont)
+{
+	int task_count;
+	rcu_read_lock();
+	task_count = __cgroup_task_count(cont);
+	rcu_read_unlock();
+	return task_count;
+}
+
 /* Return true if the cgroup is a descendant of the current cgroup */
 int cgroup_is_descendant(const struct cgroup *cont);