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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>
This commit is contained in:
Tejun Heo 2014-04-23 11:13:16 -04:00
parent bd53d617b3
commit 6803c00628
2 changed files with 7 additions and 0 deletions
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3
include/linux/cgroup.h
View File

@ -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

4
kernel/cgroup.c
View File

@ -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;