From: Balbir Singh <[email protected]>
(container->cgroup renaming by Paul Menage <[email protected]>)
Allow tasks to migrate from one cgroup to the other. We migrate
mm_struct's mem_cgroup only when the thread group id migrates.
Signed-off-by: Balbir Singh <[email protected]>
Signed-off-by: Paul Menage <[email protected]>
---
mm/memcontrol.c | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+)
diff -puN mm/memcontrol.c~memory-controller-task-migration-v7 mm/memcontrol.c
--- a/mm/memcontrol.c~memory-controller-task-migration-v7
+++ a/mm/memcontrol.c
@@ -326,11 +326,46 @@ static int mem_cgroup_populate(struct
ARRAY_SIZE(mem_cgroup_files));
}
+static void mem_cgroup_move_task(struct cgroup_subsys *ss,
+ struct cgroup *cont,
+ 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);
+
+ if (mem == old_mem)
+ goto out;
+
+ /*
+ * Only thread group leaders are allowed to migrate, the mm_struct is
+ * in effect owned by the leader
+ */
+ if (p->tgid != p->pid)
+ goto out;
+
+ css_get(&mem->css);
+ rcu_assign_pointer(mm->mem_cgroup, mem);
+ css_put(&old_mem->css);
+
+out:
+ mmput(mm);
+ return;
+}
+
struct cgroup_subsys mem_cgroup_subsys = {
.name = "memory",
.subsys_id = mem_cgroup_subsys_id,
.create = mem_cgroup_create,
.destroy = mem_cgroup_destroy,
.populate = mem_cgroup_populate,
+ .attach = mem_cgroup_move_task,
.early_init = 1,
};
_
--
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