Hello, Manddep.

On Tue, Jan 24, 2012 at 10:26:31AM -0800, Mandeep Singh Baines wrote:

In cgroup_attach_proc, we indirectly call find_existing_css_set 3
times. It is an expensive call so we want to call it a minimum
of times. This patch only calls it once and stores the result so
that it can be used later on when we call cgroup_task_migrate.

This required modifying cgroup_task_migrate to take the new css_set
(which we obtained from find_css_set) as a parameter. The nice side
effect of this is that cgroup_task_migrate is now identical for
cgroup_attach_task and cgroup_attach_proc. It also now returns a
void since it can never fail.

Changes in V5:
* https://lkml.org/lkml/2012/1/20/344 (Tejun Heo)
  * Remove css_set_refs

             ^^^^^^^^^^^^

 static int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
 {
-	int retval, i, group_size;
+	int retval, i, group_size, css_set_refs = 0;

				   ^^^^^^^^^^^^
Wrong patch?

Thanks.

-- 
tejun