cgroup: don't call migration methods if there are no tasks to migrate

[karo-tx-linux.git] / kernel / cgroup / cgroup-internal.h

diff --git a/kernel/cgroup/cgroup-internal.h b/kernel/cgroup/cgroup-internal.h
index 00f4d6bf048fab1d25068842859075a3e3b952dd..8b4c3c2f2509d2b49666410b011bf604926194f3 100644 (file)
--- a/kernel/cgroup/cgroup-internal.h
+++ b/kernel/cgroup/cgroup-internal.h
@@ -33,6 +33,9 @@ struct cgroup_taskset {
        struct list_head        src_csets;
        struct list_head        dst_csets;
 
+       /* the number of tasks in the set */
+       int                     nr_tasks;
+
        /* the subsys currently being processed */
        int                     ssid;
 
@@ -192,6 +195,8 @@ int cgroup_rmdir(struct kernfs_node *kn);
 int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
                     struct kernfs_root *kf_root);
 
+int cgroup_task_count(const struct cgroup *cgrp);
+
 /*
  * namespace.c
  */