memcontrol: move oom task exclusion to tasklist scan

[linux-2.6.git] / mm / memcontrol.c

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ac87744..2fadd48 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -110,11 +110,6 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
                                struct mem_cgroup, css);
 }
 
-inline struct mem_cgroup *mm_cgroup(struct mm_struct *mm)
-{
-       return rcu_dereference(mm->mem_cgroup);
-}
-
 void mm_init_cgroup(struct mm_struct *mm, struct task_struct *p)
 {
        struct mem_cgroup *mem;
@@ -175,6 +170,16 @@ static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
                list_move(&pc->lru, &pc->mem_cgroup->inactive_list);
 }
 
+int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
+{
+       int ret;
+
+       task_lock(task);
+       ret = task->mm && mm_cgroup(task->mm) == mem;
+       task_unlock(task);
+       return ret;
+}
+
 /*
  * This routine assumes that the appropriate zone's lru lock is already held
  */