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

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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>
This commit is contained in:
Tejun Heo 2017-08-02 15:39:38 -07:00
parent 5a621e6c95
commit 13d82fb77a
1 changed files with 2 additions and 0 deletions
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kernel/cgroup/cgroup.c
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@ -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;