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authorLi Zefan <lizefan@huawei.com>2013-04-08 19:00:38 -0700
committerTejun Heo <tj@kernel.org>2013-04-10 11:07:08 -0700
commit78574cf981cd3d9ae9f6adbd466a772310ec24ff (patch)
tree50e9da6e2e201663a22e02240d927592e893780d /kernel/events
parent415cf07a1c1c65249773330434878ae7bcd92d0f (diff)
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cgroup: implement cgroup_is_descendant()
A couple controllers want to determine whether two cgroups are in ancestor/descendant relationship. As it's more likely that the descendant is the primary subject of interest and there are other operations focusing on the descendants, let's ask is_descendent rather than is_ancestor. Implementation is trivial as the previous patch guarantees that all ancestors of a cgroup stay accessible as long as the cgroup is accessible. tj: Removed depth optimization, renamed from cgroup_is_ancestor(), rewrote descriptions. Signed-off-by: Li Zefan <lizefan@huawei.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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