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@xxxxxxxxxx>
---
include/linux/cgroup.h | 3 +++
kernel/cgroup.c | 4 ++++
2 files changed, 7 insertions(+)
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 css_set {
*/
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
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 02c99a3..b4cd1fe 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -651,6 +651,10 @@ static void link_css_set(struct list_head *tmp_links, struct css_set *cset,
struct cgrp_cset_link *link;
BUG_ON(list_empty(tmp_links));
+
+ if (cgroup_on_dfl(cgrp))
+ cset->dfl_cgrp = cgrp;
+
link = list_first_entry(tmp_links, struct cgrp_cset_link, cset_link);
link->cset = cset;
link->cgrp = cgrp;
--
1.9.0
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