cgroup: add css_set->dfl_cgrp
To implement the unified hierarchy behavior, we'll need to be able to
determine the associated cgroup on the default hierarchy from css_set.
Let's add css_set->dfl_cgrp so that it can be accessed conveniently
and efficiently.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 18fcae3..c49d161 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -354,6 +354,9 @@
*/
struct list_head cgrp_links;
+ /* the default cgroup associated with this css_set */
+ struct cgroup *dfl_cgrp;
+
/*
* Set of subsystem states, one for each subsystem. This array is
* immutable after creation apart from the init_css_set during