Commit 13d82fb7 authored Aug 02, 2017 by Tejun Heo

cgroup: short-circuit cset_cgroup_from_root() on the default hierarchy



Each css_set directly points to the default cgroup it belongs to, so
there's no reason to walk the cgrp_links list on the default
hierarchy.

Signed-off-by: Tejun Heo <tj@kernel.org>

parent 5a621e6c

kernel/cgroup/cgroup.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1311,6 +1311,8 @@ static struct cgroup cset_cgroup_from_root(struct css_set cset,

		if (cset == &init_css_set) {
		res = &root->cgrp;
		} else if (root == &cgrp_dfl_root) {
		res = cset->dfl_cgrp;
		} else {
		struct cgrp_cset_link *link;