memcg: check group leader fix
Remove unnecessary codes (...fragments of not-implemented
functionalilty...)
Reported-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b9cd57b..b837900 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2008,25 +2008,10 @@
struct cgroup *old_cont,
struct task_struct *p)
{
- struct mm_struct *mm;
- struct mem_cgroup *mem, *old_mem;
-
- mm = get_task_mm(p);
- if (mm == NULL)
- return;
-
- mem = mem_cgroup_from_cont(cont);
- old_mem = mem_cgroup_from_cont(old_cont);
-
/*
- * Only thread group leaders are allowed to migrate, the mm_struct is
- * in effect owned by the leader
+ * FIXME: It's better to move charges of this process from old
+ * memcg to new memcg. But it's just on TODO-List now.
*/
- if (!thread_group_leader(p))
- goto out;
-
-out:
- mmput(mm);
}
struct cgroup_subsys mem_cgroup_subsys = {