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Commit 6803c006 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent bd53d617

include/linux/cgroup.h

+3 −0
Original line number Diff line number Diff line
@@ -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

kernel/cgroup.c

+4 −0
Original line number Diff line number Diff line
@@ -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;