hotplug cpu move tasks in empty cpusets - refinements

- Narrow the scope of callback_mutex in scan_for_empty_cpusets().

- Avoid rewriting the cpus, mems of cpusets except when it is likely that
  we'll be changing them.

- Have remove_tasks_in_empty_cpuset() also check for empty mems.
Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Cliff Wickman <cpw@sgi.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/cpuset.c

@@ -1709,7 +1709,8 @@ static void remove_tasks_in_empty_cpuset(struct cpuset *cs)
 	 * has online cpus, so can't be empty).
 	 */
 	parent = cs->parent;
-	while (cpus_empty(parent->cpus_allowed))
+	while (cpus_empty(parent->cpus_allowed) ||
+			nodes_empty(parent->mems_allowed))
 		parent = parent->parent;
 
 	move_member_tasks_to_cpuset(cs, parent);
@@ -1741,7 +1742,6 @@ static void scan_for_empty_cpusets(const struct cpuset *root)
 
 	list_add_tail((struct list_head *)&root->stack_list, &queue);
 
-	mutex_lock(&callback_mutex);
 	while (!list_empty(&queue)) {
 		cp = container_of(queue.next, struct cpuset, stack_list);
 		list_del(queue.next);
@@ -1750,19 +1750,24 @@ static void scan_for_empty_cpusets(const struct cpuset *root)
 			list_add_tail(&child->stack_list, &queue);
 		}
 		cont = cp->css.cgroup;
+
+		/* Continue past cpusets with all cpus, mems online */
+		if (cpus_subset(cp->cpus_allowed, cpu_online_map) &&
+		    nodes_subset(cp->mems_allowed, node_states[N_HIGH_MEMORY]))
+			continue;
+
 		/* Remove offline cpus and mems from this cpuset. */
+		mutex_lock(&callback_mutex);
 		cpus_and(cp->cpus_allowed, cp->cpus_allowed, cpu_online_map);
 		nodes_and(cp->mems_allowed, cp->mems_allowed,
 						node_states[N_HIGH_MEMORY]);
-		if (cpus_empty(cp->cpus_allowed) ||
-		     nodes_empty(cp->mems_allowed)) {
-			/* Move tasks from the empty cpuset to a parent */
 		mutex_unlock(&callback_mutex);
+
+		/* Move tasks from the empty cpuset to a parent */
+		if (cpus_empty(cp->cpus_allowed) ||
+		     nodes_empty(cp->mems_allowed))
 			remove_tasks_in_empty_cpuset(cp);
-			mutex_lock(&callback_mutex);
-		}
 	}
-	mutex_unlock(&callback_mutex);
 }
 
 /*